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December 1988

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Document:	Networks Communications Communications Options Minireference Manual Volume 1 General Information and Communications Options
Order Number:	EK-CMIV1-RM
Revision:	005
Pages:	221
Original Filename:

OCR Text

EK-CMIV1-RM-005

Networks. Communications

Communications Options
Minireference Manual
Volume 1

General Information and
Communications Options

DIGITAL INTERNAL USE ONLY

Digital Equipment Corporation

1st Edition, December 1981
2nd Edition, August 1984
3rd Edition, August 1986
4th Edition, August 1987
5th Edition, August 1988

The information in this document is subject to change without notice and should .
not be construed as a commitment by Digital Equipment Corporation. Digital
Equipment Corporation assumes no responsibility for any errors that may
appear in this document.

Printed in U.S.A.

This document was set on a DIGITAL DEeset Integrated Publishing
System.
•

Class A Computing Devices:

Notice: This equipment generates, uses, and may emit radio frequency energy.
The equipment has been type tested and found to comply with the limits for a
Class A computing device pursuantto SubpartJ of Part 15 of FCC Rules, which
are designed to provide reasonable protection against such radio frequency interterence
when operated in a commercial environment. Operation of this equipment in a
residential area may cause interference in which case the user at his own
expense may be required to take measures to correct the interference.
The following are trademarks of Digital Equipment Corporation:

momoomo™
DEC
DECmate
DECset
DECsystem-lO
DECSYSTEM-20

DECUS
DECwriter
DIBOL
MASSBUS
PDP
P/OS

Professional
Rainbow

RSTS
RSX
Scholar
ULTRIX
UNIBUS
VAX
VMS
VT
Work Processor

CHAPTER 1
INTRODUCTION

The Communications Options Minireference series of manuals provide Field Service personnel (trained in
Digital Equipment Corporation's communications options, DEC modem products, and Ethernet prodllcts)
with easy-to-use references that focus on essential installation and maintenance procedures.
This series of manuals is a replacement for and supersedes the Communications Options Minireference
Manual (EK-CMINI-RM). All of the information contained in the Communications Options MinireJerence Manual is included. Information concerning most of Digital Equipment Corporation's new communication options, modem products, and Ethernet products has also been included. These manuals will be
updated as new communications options, modem products, and Ethernet products are produced.
To effectively use these reference manuals and to quickly locate the desired information, it is important
that the user be aware of the organization and content of the various manuals.
•

Volume I contains generic communications information such as: cables, test connectors and
terminators, special test programs, and special tools and equipment. Volume I also contains
information concerning installation and maintenance of some of the communications options.

•

Volume 2 contains only communications options. Communications options are presented in
alphanumerical order beginning in Volume I and continuing into·Volume 2.

•

Volumes 3 and 4 contain information concerning Digital Equipment Corporation's modem
products.

•

Volumes 5, 6, and 7 contain information concerning installation and maintenance of Ethernet
products. Chapters include Ethernet Devices, Cables, Special Tools and Test Equipment, Network
Troubleshooting, and Ethernet Configuration. Provisions are made for adding information as it
becomes available.

Option-specific data is located alphanumerically by option designation.

1-1

CHAPTER 2
FLOATING DEVICE
ADDRESSES AND VECTORS
AND DIAGNOSTIC
SUMMARY CHARTS
2.1 FLOATING DEVICE ADDRESSES
UNIBUS addresses 760010 (160010) through 763776 (163776) are designated as floating device
addresses (see the following figure). These are used as register addresses for communications devices and
other devices interfacing with the PDP-II, LSI-II, and VAX-II systems.
NOTE
Some devices are not supported by LSI-ll and
VAX-II systems; however, the same scheme applies
(that is, gaps are provided as appropriate). The convention for assigning these addresses is as follows:
777 777

DIGITAL EQUIPMENT
CORPORATION

2K
WORDS

(FIXED ADDRESSES)

DR11-C

WORDS

t
USER ADDRESSES

770000
767777

764000
763777

t
lK
WORDS

FLOATING ADDRESSES
DIGITAL EQUIP CORP (DIAGNOSTICS)

760010
760 006
760 000
757 777
001 000
000 777

VECTORS

FLOATING VECTORS

000 300
000277
TRAP & INTERRU PT
VECTORS

48
VECTORS

000 000
MK-21S0

Figure 2-1

Floating Device Addresses
2-1

A gap of 109 must be left between the last address of one device type and the first address of the next
device type. The first address of the next device type must start on a module 109 boundary. The gap of 109
must also be left for devices that are not installed but are skipped over in the priority ranking list. Multiple
devices of the same type must be assigned contiguous addresses. Reassignment of device types already in
the system may be required to make room for additional ones.
Table 2-1
Rank

Floating CSR Address Devices
UNIBUS
Option

I
2
3
4
5
6
7
8

DJll
DHII
DQII
DUll
DUPII
LKIIA
DMCII/DMRII *
DZllt
DZ32, DZSII

9
10
II
12
13
14
15
16
17
18

KMCII
LPPII
VMV21
VMV31
DWR70
RLII
LPAII-K
KWII-C
Reserved
RXll/RX211

19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35

DRII-W
DRII-8
DMPII

*
**
t
:I:

LSI-ll
Option

DUVII

DZVll
DZQll

RLVII

RXVII
RXV211

DPVll
IS811
DMVII
DEUNA
UDA50
DMF32
KMSII (DMS)
VSIOO
TU81
KMVI}
DHUII
DMZ32
CPI32

Decimal
Size

Octal
Modulus

4
8
4
4
4
4
4
4

10
20
10
10
10
10
10
10 (DZII Before DZ32)

4
4
4
8
4
4
8
4
4
4

10
10
10
20
10
10:1:
20:1:
10
10
10:1:

4
4
4
4
4
8
4
2
16
6
8
2
8

10
10**
10
10
10
20
10
4
40
20
20
4
20
20
40
40
10

DHV l1/DHQ II

DSVll

16
16
4

DMCII before DMRll.
After second device.
DZIIE and DZIIF are dual DZll options and are treated by the algorithm as two DZlls.
Extra devices only.
2-2

2.2

FLOATING VECTOR ADDRESSES

Vector addresses 300 through 777 are designated as floating vectors. They are used for communications
and other devices that interface with the PDP-I 1, LSI-II, and VAX-II systems. TheLSI-ii floatingvector area is limited to a starting address of300 through 376. The area from 400 to 450 is reserved for LSI-II
devices ADVII-A, IBVII-A, and KWVII-A with additional space available from 450 to 777.

NOTE
Some devices are not supported by LSI-II and
V AX-II systems; however, the same scheme applies.
Vector size is detemined by the device type.
There are no gaps in floating vectors unless required by physical hardware restrictions (in data communications devices, the receive vector must be on a zero boundary and the transmit vector must be on a 48
boundary).
Multiple devices of the same type would be assigned vectors sequentially. Table 2-2 shows the assignment
sequence.
Table 2-2

Floating Interrupt Vector Devices

Rank

UNIBUS
Option

1
I
2
2
2
2
3

4
5
6
7
8
9
10
10
II
12
13
14
14
14
15

DCll
TU58**
KLII (extra)
DLlI-A (extra)
DLlI-B (extra)

LSI-ll Bus
Option

DLVII-F
DLVll-J

DPll
DMII-A
DNII
DMII-BB/BA
DH 11 modem control
DRII-A
DRII-C
PA611 (reader)
PA611 (punch)
LPDll
DT07
DXll
DLlI-C
DLI1-D
DLlI-E
DJll

DRVII-B
DRVII

DLVII-E

Decimal
Size

Octal
Modulus

4
4
4
4
4
16
4
4
2
2
2
4
4
8
8
4
4
4
4
4
4
4

10
10
10*
10*
10
10
10
10*

The vector for the device of this type must always be on a 108 boundary.
There is no standard configuration for systems with both DCII and TU58.

2-3

4
4
4

10*
10*
10*
10*
10
10*
10*
10*
10*
10*
10*

Table 2-2
Rank

Floating Interrupt Vector Devices (Cont)
UNIBUS
Option

16
17
17
18
19
20
21
22
23
23
24
25
26
27

DHII
GT40
VSVII
LPSII
DQII
KWII-W
DUll
DUPII
DVII
DV modem control
LKII-A
DWUN
DMCII/DMRII
DZII
DZSII
DZ32

28
29
30
31
32
33
34

KMCII
LPPII
VMV21
VMV31
VTVOI
DWR70
RLII

35
36
37
38
39

TSII, TU80
LPAII-K
IPII/IP300
KWII-C
RXII/RX211

40
41
42
43
44
45
46
47
48

DRII-W
DRII-B
DMPII

LSI-ll
Option

KWVII
DUVII

DZVII
DZQl1

RLVII

RXVII
RXV211

DPVII
MLII
ISBII
DMVII
DEUNA
UDA50

Decimal
Size

Octal
Modulus

4
8
8
12
4
4
4
4
4
6
4
4
4
4

lOt
10
10
10*
lOt
10
10*
10*
10*
10
10
10
10*
10*
:j:

4
4
4
4
4
4
2

10
10
10
10
10
10*
4**

2
4
2
4
2

4**
10
4
10
4**

2
2
4
4
2
4
4
2
2

4
4**
10
10
4#
10
10
4**
4**

* The vector for the device of this type must always be on a 108 boundary.
** After the first.
t These devices can have either an M7820 or M7821 interrupt control module.
However, it should always be on a 108 boundary.
:j: DZ II before DZ32
# MASSBUS device.

2-4

Table 2-2

Floating Interrupt Vector Devices (Cont)

Rank

LSI-·II
Option

UNIBUS
Option
DMF32
KMSII
PCLI 1-13
VSIOO
TU81
KMVII
KCT32
lEX
DHUII
DMZ32
CPI32

49
50
51
52
53
54
55
56
57
58
59
60

DHQ 11 /DHV 11
DSVII

Table 2-3

Decimal
Size

Octal
Modulus

16
6
-4
2
2
4
4
4
4
12
12
2

4
10
10
4
4
10
10
10
10
4
4
4

Link Test/DEC/ Xll Diagnostic Index

Device
Option

DCLT
PDP-II
VAX-ll

ITEP
Overlay

DEC/XlI

DHII
DHUII
DHVII
DLI I-E
DLI I-W
DLVII
DMCII
DMF32

N/A
N/A
N/A
N/A
N/A
N/A
CZCLK
NONE

N/A
N/A
N/A
N/A
N/A
N/A
EVDMC
EVDLF

DZDHL
N/A
N/A
N/A
N/A
N/A
DZDMO
NONE

CXDHA
CXDU
CXDHV
CXDLA
CXDLA
CXDLA
CXDMC
NONE

DMPII
DMRII
DMVII
DMZ32

CZCLM
CZCLK
CZCLM
NONE

EVDMD
EVDMC
N/A
NONE

N/A
DZDMO
N/A
NONE

CXDMD, CMDME
CXDMR
CXDMD, CXDME
NONE

DPVII
DQII
DUll
DUPII
DUVII
DVII
DZII
DZII-X
DZ32
DZQ11
DZVII

CZCLH
N/A
N/A
CZDCL
N/A
N/A
N/A
N/A
N/A

N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A

N/A
DZDQO
DZDUO
DZDPF
N/A
DZDVO
DZDZB
DZDZB
N/A
DVDZD
DVDZD

CXDPV
CXDQA
CXDUA
CXDPB
N/A
CXDVA
CXDZA
CXDZA
N/A
CXDZB
CXDZB

N/A

N/ A = Not available

2-5

Table 2-4

General Purpose/Functional Diagnostic Index

Option

PDP-II Systems

VAX-II Systems

DHll
DHUll

CZDHM,CZDHN,DZDHK
CZDHU,CZDHV,CZDHW
CZDHX
CVDHA,CVDHB,CVDHC
DZDLA
DZDLA,DZDLD
DVDV A,DVDVC
CZDMC
CZDME
CZDMH

None
EVDAH
EVDAI
NONE
NONE
NONE
NONE
EVDXA
EVDBA
EVDBB
EVDCA
EVDMC
EVOLA
EVDLB
EVDLC
EVDLD
EVDXA
EVDMA
EVDMB
EVDXA
EVDCA
EVDMC
EVDMA
NONE
EVDAE
EVDAF
NONE
NONE
NONE
EVDCA
EVDUP
EVDUQ
NONE
EVDEA
EVDEB
EVDEC
EVDED
EVDEE
EVDEF
EVDEG
EVDAA
EVTAA
EVTBA
EVDAB
NONE
NONE

DHVll
DLll-E
DLll-W
DLVll
DMCll

DMF32

NONE

DMPll

CZDMP
CZDMT

DMRII

CZDMP.
CZDMS
CZDMI

DMVII
DMZ32

CVDMA,CVDME,CVDMT
NONE

DPVlI
DQII
DUll
DUPII

CVDPV
DZDQA,DZDQF
DZDUA,DZDUF
DZDPB
DZDPF

DUVll
DVII

DZDUQ-DZDUV
DZDVA
DZDVF

DZll,
DZll-X

DZDZA

DZ32
DZQll
DZVII

NONE
DVDZA,DVDZB,DVDZC
DVDZA,DVDZB,DVDZC

2-6

Level

2R
3

3
3
3
2R
2
2R
3
3
3
3
3
2R
3
2R
2
3
3
2R

2R
3
3
2
3
3
3
3
3
3
3
2R
2R
3
2R

CHAPTER 3
CABLES

3.1 CABLES
This chapter contains a line drawing of each cable needed to configure any of the device options contained
in Volumes 1 and 2 of this manual.
Table 3-1 can be used to quickly identify which cables are used with each option.
Cables are placed in alphanumeric order for speedy reference.

3-1

Table 3-1

Communication Options Cables

IJH/.M;fj~/;
""(y~,, "~,, " " " " "
~.$' ~ " ,,~" ~ ~,., 9.." ~ ~"~ 0 0
~~~Q~~~##~#~<$'<§~

R-

CABLES
BC01 R-XX

BC03M-XX

BC03N-XX

BC05C-XX

BC050-XX

BC05L-XX

X
X

BC05M-XX

BC05Z-XX

BC06R-XX
BCOBR-XX

BCOBS-XX

BC17E

BC55A-XX

BC55B-XX

BC55C-XX

BC550-XX

BC55F

BC55H

X
X

BC55J
BC55M-XX

BC55N-XX

BC55R-XX

700B360

700B519

BC16C

70-18250

70-20861

MKV87-1300

3-2

Table 3-1

CABLES
BC01 R-XX

Communication Options Cables (Cont)

iJ. ~~WI'Jj!};/;
~&~"
N~" ~ " ~" ~....
~ 0° ~.... ~ ~

" " ....

c§

....

....~ !'V~....""fV"
" ~ "

is. . <f $ # ~ ~o <! Q~

BC01W-XX

BC02C-XX

BC02D-XX

BC03M-XX

BC03P-XX

BC04R-XX
BC05C-XX

X
X

BC05W-XX

BC06K-XX

BC05D-XX

BC06L-XX

BC08R-XX
BC08S-XX

X
X

BC11 U-XX
BC18L-XX

BC18M-XX

BC20R-XX

BC20S-XX

BC22N-XX
BC26L-XX

X
X
X

7016428
7018209
70-18194

BC19B

BC19D

BC19E

BC19F

17-00740-XX

X
MKV87-1301

3-3

BCOIR

RS-232
MALE CONNECTOR

M970 CONNECTOR

1..-

[

]

~-------J(0

'---------J'l

MK-3155

BCOIW

<0 O~

A
G

mO O:x:
uO 0,

B
H

C
J

00 O~

D
K
E

wO O~
~O Ou-

F/M L

:Il

e
e

**
INDICATES CAVITIES
ARE NOT USED
MK-25490.

3-4

BC02C
PIN 2

PIN 1

PIN 2

PIN 39

PIN 1

PIN 39

BC02D
PIN 49

PIN 50

PIN 49

PIN 50

RED MARKING ON EDGE OF CABLE
INDICATES CONDUCTOR 1

\
00
00
00
00
00
00
00
00
00
00
00

PIN 1

TRIANGLE
INDICATES
PIN 1

PIN 2

00
00
00
00
00
00
00
00
00
00
00

PIN 1

PIN 2
MK·2565

3-5

BC03M

RS-232

FEMALE CONNECTOR

MK·3156

BC03N

MK·2571

3-6

BC03P

·0·0••••·0
·0
:.

00
00

••
••
••
0:
o·
o·
o·

.0
.0
00

MK·2555

BC04R

MK·2842

BCOSC
H856 CONNECTOR

RS-232-C MA.LE CONNECTOR

MKV84·1617

3-7

BC05D

I [

(t)~J
l
I
qA --------1\
III

III

)

u....

--:@:.......---..:@:;...J\. . ._ _

25 PIN
CINCH

BC05D-25 (RS-232-C INTERFACE) MODEM CABLE

MKV84·1618

BC05L
H855 CONNECTOR

H855 CONNECTOR

MKV86·0830

BC05M

MATE-N-LOK
CONNECTOR

H856 CONNECTOR

--+I

~~~~:(TI
--.1
MKV84·1619

3-8

BC05W

50-CONDUCTOR
FEMALE SOCKET
CONNECTOR

50-CONDUCTOR
FEMALE SOC KET
CONNECTOR

--.J

[[

1.2111 III 1

I I

--.J

50 111111 49

I+MKV84-1620

BC05Z

A
C

E
H

K
M

••••
00 o •
• 0.0

••••

0·.·
000·
0000
0000

STRAIN RELIEF

INDICATES CAVITIES USED TO
MOUNT STRAIN RELIEF
MK·2550

3-9

BC06K
PIN 2

PIN 1

PIN 2
TRIANGLE
INDICATES
PIN 1 (2 PLACES)

PIN 1

RED STRIPE

TWIST RIBBON CABLE CONTAINS A TWIST
SECTION EVERY 21 INCHES. THERE MUST BE
AN ODD NUMBER OF TWIST SECTIONS
WITHIN ANY LENGTH VARIATION OF
BC06K CABLE.

PIN 39

BC06L
PIN 2

PIN 1

00
00

00
00
00
00
00
00
00
00

PIN 2

PIN 1

PIN 50

PIN 49

TRIANGLE
INDICATES
PIN 1 (2 PLACES)

WIRE TWIST SECTlON(S) TO BE LOCATED
IN APPROX CENTER OF CABLE AND A
MINIMUM OF 3 INCHES FROM CONNECTOR
PIN 50

PIN 49

MKV84·1621

3-10

BC06R
H855 CONNECTOR

H855 CONNECTOR

21'

MKV86-0831

BC08R
H856 CONNECTOR
UU

55
PP

MM
KK

HH
EE
CC
AA
Y
W
U

5
P

M
K

H
E
C
A

H856 CONNECTOR

TT _____I

~~J

RR -----J

LL
JJ
FF

N
R

DO
BB
Z
X
V
T
R

N
L
J

~ --+I

MKV84-1622

Be08S
40-PIN SOCKET

40-PIN SOCKET

F
J

~--.J

N
R

M
P

J
L
N
R

5
U

T
V

Z
BB

Y
AA

FF
JJ
LL

X
Z

MM
PP-.J·
55

I+-~

~~~

r--- VV

MKV84-1623

3-11

BCIlU

C
14

o.
o.
o.
o.
o·
0

••
o·

.0
25

0
00
0
08

TYPICAL 4 PLACES
P1. P2. P3. P4

**
INDICATES CAVITIES
ARE NOT USED

MK-2552

3-12

BC16C

PIN 1

FROM
CONN

TO
CONN

P1-1
P1-19
P1-2
P1-20
P1-3
P1-21
P1-4
P1-22
P1-5
P1-23
P1-6
P1-24
P1-7
P1-25
P1-8
P1-26
P1-9
P1-27
P1-10
P1-28
P1-11
P1-29
P1-12
P1-30
P1-13
P1-31
P1-14
P1-32
P1-15
P1-33
P1-16
P1-34
P1-17
P1-35
P1-18
P1-36

P2-1
P2-19
P2-2
P2-20
P2-3
P2-21
P2-4
P2-22
P2-5
P2-23
P2-6
P2-24
P2-7
P2-25
P2-8
P2-26
P2-9
P2-27
P2-10
P2-28
P2-11
P2-29
P2-12
P2-30
P2-13
P2-31
P2-14
P2-32
P2-15
P2-33
P2-16
P2-34
P2-17
P2-35
P2-18
P2-36

"'-P2

MALE CONNECTOR

PIN 1

MALE CONNECTOR
MKV86-0832

3-13

BC17E

FROM TO
CONN CONN
P1-V
P1-X
P1-R
P1-T
P1-Y
P1-A
P1-P
P1-S
P1-U
P1-W
P1-D
P1-B
P1-C
P1-B
P1-F
P1-B
P1-E
P1-B
P1-J
P1-B
P1-H
P1-B
P1-K
P1-B
P1-A
P1-A
P1-B

P2-8
P2-26
P2-6
P2-24
P2-5
P2-23
P2-4
P2-22
P2-17
P2-35
P2-9
P2-19
P2-7
P2-19
P2-13
P2-19
P2-11
P2-19
P2-15
P2-19
P2-12
P2-19
P2-10
P2-19
P2-1
P2-1
P2-19

37 PIN D-SUB

34 PIN DDS

MKV86-0827

BC18L/M

MKV84-0787

3-14

BC19B

50-WAY SIGNAL
NAME
PINS
1
2
3
4

37-WAY
PINS

CODE GROUND
CODE 0
CODE 1
CODE 2
CODE 3

PIN 17

PIN 1

PIN 33

PIN 18
PIN 34

PIN 50
In

L'll

6
7
9
10
11
12
13
15
16
17
18
19
20
21
34
35
37
38
39
40
41

TX DATA (A)
TX DATA (8)
RTS/C (A)
RTS/C (8)
RX DATA (A)
RX DATA (8)
LOCAL LOOP
TEST 1
REM.LOOP
R1
RX CLOCK (A)
RX CLOCK (8)
TX CLOCK (A)
TX CLOCK (8)
DSR (A)
DSR (8)
DCDII (A)
DCDII (8)
CTS (A)
CTS (8)
DCE GROUND

4
22
7
25
6
24
10
18
14
15
8
26
5
23
11
29
13
31
9
27
20

44
45
46
47
48

DTE GROUND
DTR(A)
DTR (8)
CLOCK (A)
CLOCK (8)

19.37
12
30
17
35

PIN 37

PIN 19

5 O-WAY O-TYPE
C ONNECTOR
(F EMALE)

LJ
~

3 7-WAY O-TYPE
C ONNECTOR (MALE)

I
III

I
JI I
PIN 20

':)000000000000000

SPEED

00000000000000000

PIN 1

* - CONNECTED TOGETHER
(A).(8) - WIRES A AND 8 OF A TWISTED PAIR
MKV87-1298

3-15

BC19B-02

FROM
CONNECTION
(Pl)

TO CONNECTION
(P2)

50-WAY D-TYPE CONNECTOR
(FEMALE)

Pl-l,4
(SEE NOTE 1)
Pl-6
Pl-7

P2-4
P2-22

Pl-9
Pl-l0

P2-7
P2-25

Pl-ll
Pl-12
(SEE NOTE 2)

P2-6
P-24

r-ol

Pl-13

P2-10

Pl-14

P2-2

Pl-15

P2-18

Pl-16

P2-14

Pl-17

P2-15

Pl-18
Pl-19
(SEE NOTE 2)

P2-8
P2-26

Pl-20
Pl-21
(SEE NOTE 2)

P2-5
P2-23

Pl-34
Pl-35

P2-11
P2-29

Pl-37
Pl-38

P2-13
P2-31

Pl-39
Pl-40

P2-9
P2-27

Pl-41

P2-20

Pl-44

P2-19.37

Pl-45
Pl-46

P2-12
P2-30

Pl-47
Pl-48

P2-17
P2-35

Pl-50

P2-16

P1-SHELL

P2-SHELL

LJ
~

111

PIN 37 __ ~------_" ~PIN 20

................
.................

PIN 1

PIN 19
37-WAY D-TYPE
CONNECTOR (MALE)

NOTES
1. CONTACTS TIED TOGETHER
2. 120 OHM RESISTER. 1/2W. BETWEEN
PINS 11 AND 12. 18 AND 19. 20 AND 21.
MKV87-1059

3-16

BC19D

50-WAY
PINS

SIGNAL
NAME

25-WAY
PINS

1
2
3
4
5

CODE GROUND
CODE 0
CODE 1
CODE 2
CODE 3

8
11
12
13
15
16
17
18
19
20
21
22
33
34
35
36
37
38
39
40
41

TX DATA
RX DATA (A)
RX DATA (8)
LOCAL LOOP
TEST 1
REM.LOOP
RI
RX CLOCK (A)
RX CLOCK (8)
TX CLOCK (A)
TX CLOCK (8)
CLOCK
DTR
DSR (A)
DSR (8)
RTS
DCDII (A)
DCDII (8)
CTS (A)
CTS (8)
DCE GROUND

2
3
#
18
25
21
22
17
#
15
#
24
20
6
#
4

DTE GROUND

7,#

SPEED

PIN 17

_ _ _ _ _ _ _./ PIN 1
PIN 18

PIN 33
PIN 50

,..,(

PIN 34

5O-WA Y 0- TYPE
CONNECTOR
(F EMALE)

.....

8
#
5
#
#

2 5-WAY 0- TYPE
CONNECTOR (MALE)

P2
(

PIN 14

* - CONNECTED TOGETHER

....

PIN 1

1
III
Tl
_ - - - - - _ . _ ' PIN 25
":)000000000000000
PIN 13
00000000000000000

# - CONNECTED TO DCE GROUND
(A),(8) - WIRES A AND 8 OF A TWISTED PAIR
MKV87·1296

3-17

BC19D-02

50-WAY D-TYPE CONNECTOR
(FEMALE)

FROM
CONNECTION
(P1)

TO CONNECTION
(P2)

PIN 33

P1-13
(SEE NOTE)

PIN 18

P1-8

P2-2

P1-11

P2-3

P1-13

P2-18

P1-15

P2-25

P1-16

P2-21

P1-17

P2-22

P1-18

P2-17

P1-20

P2-15

P1-22

P2-24

P1-33

P2-20

P1-34

P2-6

P1-36

P2-4

P1-37

P2-8

P1-39

P2-5

P1-41, 12.19.
21, 35, 38, 40.
44 (SEE NOTE)

P2-7

P1-50

P2-23

P1-SHEll

P2-SHEll

PIN14

PIN 25

PIN 13

PIN 1
25-WAY D-TYPE
CONNECTOR (MALE)

NOTE: CONTACTS TIED TOGETHER

MKV87·1061

3-18

BC19E

50-WAY
PINS

'SIGNAL
NAME

CODE GROUND
CODE 0
CODE 1
CODE 2
CODE 3

8
11
12
13
15
16
17
18
19
20
21
22
33
34
35
36
37
38
39
40
41

TX DATA
RX DATA (A)
RX DATA (8)
LOCAL LOOP
TEST 1
REM.LOOP
RI
RX CLOCK (A)
RX CLOCK (8)
TX CLOCK (A)
TX CLOCK (8)
CLOCK
DTR
DSR (A)
DSR (8)
RTS
DCDII (A)
DCDII (8)
CTS (A)
CTS (8)
DCE GROUND

4
6
24
10
18
14
15
8
26
5
23
17
12
11
29
7
23
32
9
27
20

DTE GROUND

SPEED

19,22,25,
30, 35, 37
16

2
3
4

37-WAY
PINS

PIN 17 ---...,_ _ _ _ _ _ _ PIN 1
PIN 33

PIN 18

PIN 50

PIN 34

,...,r

1,...,

l
P1

5O-WAY D-TYPE
CONNECTOR
(F EMALE)

~J
~
r~
3 7-WAY D-TYPE
CONNECTOR (MALE)

r
PIN 37

I Il

lfl

':)000000000000000

* - CONNECTED TOGETHER

PIN 19

00000000000000000

PIN 20
PIN 1

(A), (8) - WIRES A AND 8 OF A TWISTED PAIR
MKV87·1299

3-19

BC19E-02

FROM·
CONNECTION
(P1)

50-WAY O-TYPE CONNECTOR
(FEMALE)
TO CONNECTION
(P2)

P1-1,3
(SEE NOTE)

PIN 17 ........._ - - - - - -___ PIN 1

...............
...............

PIN 3 3 - - - · ·············----PIN 18
PIN 34

PIN 50
P1-8

P2-4

P1-11
P1-12

P2-6
P2-24

P1-13

P2-10

P1-14

P2-2

P1-15

P2-18

P1-16

P2-14

P1-17

P2-15

P1-18
P1-19

P2-8
P2-26

P1-20
P1-21

P2-5
P2-23

P1-22

P2-17

P1-33

P2-12

P1-34
P1-35

P2-11
P2-29

P1-36

P2-7

P1-37
P1-38

P2-13
P2-31

P1-39
P1-40

P2-9
P2-27

P1-41

P2-20

P1-44

P2-19,22,25
30,35,37
(SEE NOTE)

P1-50

P2-16

P1-SHELL

P2-SHELL

PIN 37

................

PIN 20

PIN 1

PIN 19
37-WAY O-TYPE
CONNECTOR (MALE)

NOTE: CONTACTS TIED TOGETHER
MKV87-1060

3-20

BC19F

50-WAY SIGNAL
PINS
NAME
1
2
3
4
5
17
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41

CODE GROUND
CODE 0
CODE 1
CODE 2
CODE 3
RI
V.35 TX CLOCK (A)
V.35 TX CLOCK (8)
V.35 CLOCK (A)
V.35 CLOCK (8)
V.35 RX DATA (A)
V.35 RX DATA (8)
V.35 TX DATA (A)
V.35 TX DATA (8)
V.35 RXCLOCK(A)
V.35 RXCLOCK(8)
DTR
DSR (A)
DSR (8)
RTS
DCDII (A)
DCDII (8)
CTS (A)
CTS (8)
DCE GROUND

DTE GROUND

34-WAY
PINS

PIN 17

PIN 1

PIN 33

-PIN 18

PIN 50

PIN 34
50-WAY D-TYPE
CONNECTOR
(FEMALE)

J
Y

a
U
W
R
T

P
S
V
X
H
E
#

C
F
#

D
#
#
B,#

34-WAY SQUARE
CONNECTOR (MALE)

* CONNECTED TOGETHER
# CONNECTED TO DCE GROUND

00000000
000000000
00000000

(A), (8) - WIRES A AND B OF A TWISTED PAIR

000000000

MKV87·1297

3-21

BC19F-02

50-WAY D-TYPE CONNECTOR
(FEMALE)
- . . - - - - - - - - - -- PIN 1
FROM
CONNECTION
(Pl)

TO CONNECTION
(P2)

PIN 33

•••••••••••••• . .---PIN 18

_ _ _ _ _ _ _ _...J"-.... PIN 34

Pl-1.2
(SEE NOTE)
P1
Pl-17

P2-J

Pl-23
Pl-24

P2-Y
P2-A

Pl-25
Pl-26

P2-U
P2-W

Pl-27
Pl-28

P2-R
P2-T

Pl-29
Pl-30

P2-P
P2-S

Pl-31
Pl-32

P2-V
P2-X

Pl-33

P2-H

Pl-34

P2-E

Pl-36

P2-C

Pl-37

P2-F

Pl-39

P2-D

Pl-41, 35, 38
40,44
(SEE NOTE)

P1-44

P2-B

Pl-SHElL

P2-BRAID

.........................
... ... .. .

NOTE: CONTACTS TIED TOGETHER
34-WAY SQUARE
CONNECTOR (MALE)
MKV87-1058

3-22

BC20R

MK-2571

BC10S

MK-2570

3-23

BC22D-**
TWO RS-232 (FEMALE) CONNECTORS

(]J

&</

§g
13

25 PIN O-SUB

:8 14

n 25
0

PIN OUT
1-1
2-3
3-2
6-20
7-7
20-6

BC22E-**
RS-232 (FEMALE)

RS-232 (MALE)
0

25 g: 13

14 ~~
·o~ 1

25 PIN O-SUB

BC22F-**
RS-232 (FEMALE)

RS-232 (MALE)
25 :. 13

::
=i

Ii
14 ~: 1

(}]

25 PIN O-SUB

Ii 14
Ii
..i:

.. 25
0

MKV86-0828

BC22N-**

MKV84-0797

3-24

BC26L

••
••
••
••
••
••
••
••
••
• 0
.0

INDICATES CAVITIES
ARE NOT USED
MK·2551

BCSSA
Appropriate terminator connectors H3257 or H3258 must be used.

FEMALE CONNECTORS

J!;uul

BC55A-10(INTEGRAL MODEM) PANEL CABLE

MALE CONNECTORS
CONNECTOR PANEL
(FRONT VIEW)
MKV84-1624

3-25

BC55B

00 0

~~ °00

BC55B-l0 (RS-422-A INTERFACE) PANEL CABLE
MKV84-1625

BC55e

NOT USED
IN DMP11

RS-232-C

RS-423-A

MOUNT WITH CABLE
RIB SIDE FACING OUT
J1

c::J W8

c::J W9
c::J W10

J3
0

0
0

<
<
Wl

c::J

[ill
[ill

c::J Wl1

c:J W12

c:JW2
c:J W3

c::J W13

[ill

c:J W14

IT§]

c:J W15

c:JW4

c:J W16

c:J W5

c::J W17

c:J W6

c::J Wl B

lliJ
c:J W7

c::J W19

c:J W20

[QJ c::J W21

OITJ
BC55C-10 (RS-232-C/RS-423-A) INTERFACE PANEL CABLE
MKV84-1626

3-26

BCSSC
Table 3-2

Modem Option Jumper Functions

~
v

r'V

J2
PIN
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25

rolQ

<f?
CC
~

lOc§J

W1
W7

W19

W14
W3
W2
W6
W20
W5
W18
W17
W4

IN
IN
IN
IN
IN
IN

"tV

W16
W13

W21
W12
W15
W10
W11
W9
W8

jI~c6 lQ~ lQ~ Q~ Q~

JUMPER

1::-

IN
IN
IN
IN
IN
IN

IN
IN
IN
IN
IN

IN
IN
IN
IN
IN
IN

IN
IN
IN
IN
IN
IN
IN

IN
IN

~ <i>~
0

IN
IN

tV ~

1::-

rjji;

1...$ . .0).

rC' . .f:f. <::J.

t?l'v
~

¢"~ ¢"~

101

BA
BB
CA
CB
CC
AB
CF

SD
RD
RS
CS
DM
SG
RR

103
104
105
106
107
102
109

126
SF
SRR 122
SCS 121
SSD 110
114
ST
SRD 119
RT
115
LL
141
SCA SRS 120
CD TR
108
CG SO 110
140
RL
CE
IC
125
CH
111
SR
CI
112
SF
116
SS
DA n
113
SB
117
TM 142
MAKE BUSY
SCF
SCB
SBA
DB
SBB
DD

MKV84-0789

3-27

<P 1::-

BC55D

37 PIN
CINCH

]

~-~....---...
BC55D-33 (RS-422-NRS423-A INTERFACE) MODEM CABLE

37 PIN
CINCH

MKV84·1627

BC55F

FEMALE CONNECTORS

BC55F (INTEGRAL MODEM) PANEL CABLE

MALE CON NECTORS
CONNECTOR PANEL
(FRONT VIEW)
MKV84-0790

NOTE
The BC55F cable is very similar to the BC55A. The
only difference is in the connector panel configuration (see BC55A).

3-28

BeSS"

RS-423-A

RS-232-C

W1 c:::J
W2 c:::J
W3 c:::J
W4 c:::J
,---' I
W5 c:::J
• I W6 c:::J
I
W7 c:::J
W8 c:::J
I W9 c:::J
J1

1--::,--1
J2
,---,
I

'/:1
001

, •

1
1

- ,

c:::J W15
c:::J W16
c:::J W17

I ' ',I c::J W20
I: 0 1'

,I C5 c::::J

I • :II

I: :1:

•

I •• 11

I C6 c::::J
I C4[=:J
I C3 [=:J
C1 c::::J
I C2[=:J
I W10 c:::J

, • ,I,
I : •II

l (, J

•
I' • • I
I - - -.... I

c::J W18

'1 1 c::J W19

'-_!.J,

,----"

>
>

W11 c:::J
W12 c:::J
W1 3 c:::J '--==:-:-'
W14c:::J

BC55H-3 (RS-232-C/RS-423-A) INTERFACE PANEl CABLE
MKV84·1628

)
3-29

BeSSH
Table 3-3

BeSSH Modem Option Jumper Functions
FUTURE 0
X.21BIS
rrx.20BIS
//

It /; rJr:i;f;f!jJj~1J/.!4
~

~
~

23
21
11
23
16
14
12
21
4
15
17
18
19

W1
W2
W3
W4
W5
W6
W7
W8
W9
W10
W11
W12
W13
W14
W15
W16
W17
W18
W19
W20
W21

25
24
25
24
13
25
1
2
3
5
6
7
8
20
22

v
rV

&' ~ rv~~~CS:>rVcV<bcV"
<0
rv 'i)i ~. ~. ~ry~. ,!25 .!2.'V .!2.'V 0rV
~
~.
",,,
'V
rv iij iij iij iij /:- 1;- 1;- 1;- " " "
tP 1;r:v.:::.:::.::: A.;. A.;. A.;. A.;. "- "- "- "- [f [f [f :'<~
i<;"f
8"
tP~~~ o",r,ro" &&&& ~ ~ ~ i{j
v
rV

')(b

(;

IN
IN

IN
IN
IN
IN
IN
IN
IN

IN
IN
IN

IN'

IN
IN
IN
IN

IN
IN
IN

IN
IN

CH
CG

IN
IN
IN
IN IN
IN
IN
IN
IN
IN
IN
IN
IN
IN
IN
IN
IN
IN
IN
IN
IN
IN
IN
IN
IN
IN
IN
NOT NORMALLY INSTALLED
IN IN IN
IN
IN
IN
IN
IN

IN
IN
IN

IN
IN

IN
IN
IN
IN
IN
IN

IN
IN
IN
IN
IN

IN
IN
IN
IN

IN
IN

CI
SBB
SBA
SCF
CA
DB
DO
SCA

sa
SF
SR
SRD
SSD
SRR
RL
RS
ST
RT
LL
SRS

111
110
126
112
119
118
122
140
105
114
115
141
121

TM
142
TT
113
SB
117
SS
116
SCB SCS 121
MAKE BUSY
AA
101
BA
103
SO
BB
RD
104
106
CB
CS
OM
107
CC
102
AB
SG
RR
109
CF
108
CD
TR
CE
IC
125
DA

MKV86-0833

3-30

BC55J

FEMALE CONNECTORS

XMIT

MALE CONNECTORS
CONNECTOR PANEL
(FRONT VIEW)
MKV84-1630

BC55M

Cable is used for the same purpose as the BC55N, but for data rates above 56K bits/so

USES: BELDEN 8232 - UP TO 4.3 KM (14K FEET)·
BELDEN 8233 - UP TO 6.0 KM (18K FEET)·

mUr----L--~6

-m~ IDID

,---p

BC55M TRIAX CABLE

·MAXIMUM DISTANCE IS DEPENDENT ON SPEED.
REFER TO M8203 TECHNICAL MANUAL, EK-M8203-TM FOR DETAILS.
MK·3605

3-31

BC55N

Cable is used to interconnect local (integral) configurations for a selected data rate of 56K bits/so

USES: BELDEN 9272

BC55N TWINAX CABLE
MK-3606

Recommended connector hardware for building BC55 type cables in excess of 30 m (98 feet):
Component

DIGITAL Part Number

AMP Part Number

Small cable clamp
Large cable clamp
Male housing
Male pin
Female housing
Female pin
14 gauge male pin

12-11430-00
12-11430-01
12-12527
12-12001
12-12526
12-12000
12-12001-1

206062-1
206358-1
206153-1
66589-2
206060-1
66590-2
66587-2

3-32

---'---~

BC55R

TRANSMIT IN

BC55R-*" DECAL

AT. I.
~

RECEIVE IN

R.I"A
R.O.

T.O.

RECEIVE OUT

TRANSMIT OUT
IN
I

IN
IN

VIEW E
-

- - t::,.--:;
....~-'"'

BC55R- O • (INTEGRAL MODEM) PANEL CABLE

- - -_ _ _ _ ,..

H
MKV87·1302

BC55S TRIAXIAL CABLE*

*FOR SPEEDS UP TO:
500K bits/s (FULL DUPLEX)
1 M bits/s (HALF DUPLEX)

BC55T TWINAX CABLE*

*FOR SPEEDS UP TO 56K bits/s
MKV84-0791

BC56A TRIAXIAL ADAPTOR CABLE*

BC56B TRIAXIAL ADAPTOR CABLE·

BC56D TWINAX ADAPTOR CABLE*

BC56E TWINAX ADAPTOR CABLE*

*USE ADAPTOR CABLES W/:tEN CONNECTING BC55R
INTEGRAL MODEM PANEL/CABLE TO OLDER STYLE
NETWORKS USING BC55A OR BC55J INTEGRAL
MODEM PANEL/CABLES.
MKV84-0792

3-34

70-08360

2
3
4
5
6
7

INDICATES CAVITIES
ARE NOT USED
MK·2553

70-08519

8
7
6

5
4

3
2

•
•
•
•

•
•
•
•
0

3
4

5
6
7

LOCATING
PIN
MK·2573

3-35

70-16428

** A
o.

B
DOO
F O.
J O.
L O.
N 00

C
E
H
K
M

R O. P
TOO S
VOOU
x 00 W
ZOOy
BB 00 AA
DD 00 CC
FF 00 EE
JJ 00 HH
LL 00 KK
NN . 0 MM
RR 00 PP
TT 00 SS
WOO UU

MK-2569

INDICATES CAVITIES ARE USED TO
MOUNT STRAIN RELIEF

70-18209 ~_ 70-18194

7 0-17261

- hm,noI
0

PIN 13

PIN 1

10
r-

o
MKV86-0829

3-36

70-18250

FROM
CONN

TO
CONN

Pl-JJ
Pl-FF

P2-J
P2-H

Pl-NN
Pl-MM

P2-F
F2-E

Pl-Y

Pl-VV

vvNN
JJ
FF-

•
KIJ

E-

H K

""C

F
_ LJ

MKV86-0834

3-37

70-20861

20
FROM

CONN

Pl-4
Pl-22
Pl-6
Pl-24
Pl-5
Pl-23
Pl-8
Pl-26
Pl-17
Pl-35
Pl-7
Pl-l9
Pl-ll
Pl-19
Pl-13
Pl-l2
Pl-9
Pl-19
Pl-l

P2-KK
P2-AA
P2-K
P2-S
P2-CC
P2-TI
P2-HH
P2-SS
P2-PP
P2-EE
P2-V
P2-B
P2-Z
P2-B
P2-BB
P2-DD
P2-T
P2-B

-UU

L.::.--1

\1
W

B
MKV86-0835

3-38

CHAPTER 4
TEST CONNECTORS
AND TERMINATORS

4.1 TEST CONNECTORS AND TERMINATORS
This chapter contains a line drawing of each of the test connectors and terminators needed to test any of
the device options described in Volumes 1 and 2 of this manual.
Table 4-1 can be used to quickly identify which test connectors and terminators are used with each
communication device.
Test connector drawings are placed in alphanumeric order for speedy reference.
Terminator drawings follow test connector drawings.
Most test connectors and terminators are used with more than one device option.

4-1

Table 4-1

Test Connectors and Terminators for Communication Options

CONNECTORS

~IIA
~

H315

"~""""~"
" .$'""13,,
.:::,." .::s " <; ~r, ~" ~ .:::,." " <£' "

i"~Q~<i~<fQ~Q~<f~Q~<fQ~

H325
H861C

H3101

H3103

H3248

H3249

H3250

H3251

H3254

H3255

H3276
X

X
X

X
X
X

H3195
H3196

H3197

H3198

X
X

H3199

12-12528

H8568

M974

H3277

H8611

TERMINATORS
H3257

H3258

H8570

MKV87-1294

4-2

Table 4-1

Test Connectors and Terminators for Communication Options (Cont)

CONNECTORS

H315

H325

X
X

H329
H861

H3027

H3028

H3190

X
X

H3259

H3260

H3271

H3272

H3273

H3274

H8612

29-24929-00

H327

H3248

TERMINATORS

MKV86-0837

4-3

H315
CABLE
CONNECTOR

BACKPLANE
CONNECTOR
24

EXTERNAL CLOCK

TRANSMIT CLOCK

H1=:3

RECEIVER CLOCK

S
ct'
8,"
I
I

TRANSMIT DATA

E2=:J

RECEIVE DATA

SECONDARY TRANSMIT DATA

Et:o

SECONDARY RECEIVE DATA

"'=:3
E1

CARRIER DETECT

~=:3
K2

REQUEST TO SEND

FORCE BUSY

RING

J1
CABLE
CONNECTOR

CLEAR TO SEND

DATA TERMINAL READY

............
............

DATA SET READY

6]'

BACKPLANE
CONNECTOR

H325
H325
SCE324
SCT
15
SCR

CUT TO TEST*
NEW
SYNC
SIDE 1.
•

~~==-±J

co=:=:Ll

0
O ({e • • • • • • • • • • • .1/'
JJ
,
\\ • • e • • •

• • •

• e •

'-----------------------

NEW SYNC _ _ _1
.;..4:......,

H325
DATA SET RDy-_--=6--1
CUT TO TEST*
NEW SYNC

* CUT ONLY FOR DV11

DTR _ _.-=.:20~

RI ____-2:;:2:;.......a
MKV89·0265

4-4

"327
P1

20~
..... TO
261024

22 0
28

R1
T1
RO
T2
R3

,...
...,

36 0

1
1
1
1

... T5R5 I

42 "
"'""4 o ...,

3 8 10

... R7

44 "

,...
5 o ...,
...,
4 8 ,...

..,

4 6 -.

... OTR 1
OTR 0

2 "

40
6

".....

OTR 2

3
... OTR
OTR 4

8 "

...

0"
2 0
4 0
6 ,...

-...

1n.
3

n.
.....

"...

OTR 5
OTR 6
OTR 7
CARRIER 0
CARRIER 1
CARRIER 2
CARRIER 3
CARRIER 4
CARRIER 5

13 : n.
-.
15 ..,

CARRIER 6

,...
19

RING 0

23 10
27

"'"".....

0
"'""35 .....
39 10
43 0
47

["'""-

CARRIER 7

RING 1
RING 2
RING 3
RING 4
RING 5
RING 6
RING 7

V
MK·2532

4-5

"329

TRANSMIT 0 - - - - - - - - - - _ . RECEIVE 1
OTR 0 ---------.~--- RING 1

L--

CARRIER 1

RING 0 - - - - - ,

~_--~------- DTR 1

CARRIER O ..

RECEIVE 0 ..._ - - - - - - - - - - TRANSMIT 1
NOTE:
LINES 2 & 3 ARE STAGGERED
IN THE SAME WAY:

INDICATES CAVITIES ARE NOT USED

"861
Jl
I

A)-~'~S~EC~~~3~.7~.~11~.1~5~.-~
B>-~SE~C~~~1~.5~.9~.1~3__~-+~
SEC RX 3.7.11.15

I SEC RX 1.5.9.13

~~
~
..

'C0371115
,

I CO 1.5.9.13

....

1 CS 1.5.9.13

....

I RS3.7.11.15
I RS 15.9.13

'CS371115

....

OTR 3.7.11.15

I OTR 1 .5.9.13
I RING 3.7.11.15

....

U ....
~

I RING 1.5.9.13

W)-~S~E~C~R~X~2~.6~.1~O.~14~__~
X>-~S~E~C~R~X~0.~4~.8~.1~2____~~

Y)-T'~S~E~C~TX~2.~6.~10~.~14~+-~
Z>-~S~E~C~~~0.~4.~8.~1~2__+-__~

AA
BB

C0261014

I CO 0.4.8.12

~ I CS 2.6.10.14
... I CS 04.8.12
DO
~
RS261014
EE
RSO.4.8.12
FF ~ I
HH ~ I OTR 2.6.10.14
CC

, OTR 0.4.8.12

KK ~

1 RING 2.6.10.14

I RING 0.4.8.12

M~~:
NN

NOTE:
TURNAROUND SIGNAL FLOW AND PINNING
ARE IDENTICAL FOR ALL 4 CONNECTORS (Jl-J4)

4-6

H3027
SIGNAL NAME (REFERENCED TO H3027)
PIN NUMBER

(+_)

DATA OUT A
CHASSIS GROUND
DATA IN A (+) - - - - CHASSIS GROUND
UNUSED
UNUSED
UNUSED
UNUSED
DATA OUT B ( - ) - )
UNUSED
DATA IN B (-) - - - - UNUSED
SIGNAL GROUND
UNUSED
UNUSED

10
11
12
13
14
15

MKV84·0777

H3028
Jl PIN NUMBER

9
10

SIGNAL NAME
DATA IN A (+) ]
DATA IN B (-)
SIGNAL GROUND
UNUSED
UNUSED
UNUSED
UNUSED
UNUSED
DATA OUT A (+)
DATA OUT B (-)
MKV84·0778

4-7

H3101
Jl
FEMALE CONNECTOR
FROM

FROM

CONN

J1-1
J1-3
J1-5
J1-7
J1-9
J1-11
J1-13
J1-15
J1-17
J1-18
J1-19
J1-21
J1-23
J1-25
J1-27
J1-29
J1-31
J1-33
J1-35
J1-36

J1-2
J1-4
J1-6
J1-8
J1-10
J1-12
J1-14
J1-16
NO CONN
NO CONN
J1-20
J1-22
J1-24
J1-26
J1-28
J1-30
J1-32
J1-34
NO CONN
NO CONN

P1-1
P1-3
P1-5
P1-7
P1-9
P1 -11
P1-13
P1-15
P1-17
P1-18
P1-19
P1-21
P1-23
P1-25
P1-27
P1-29
P1-31
P1-33
P1-35
P1-36

P1-2
P1-4
P1-6
P1-8
P1-10
P1-12
P1-14
P1-16
NO CONN
NO CONN
P1-20
P1-22
P1-24
P1-26
P1-28
P1-30
P1-32
P1-34
NO CONN
NO CONN

-I
rr-

~
~

P1
MALE CONNECTOR
MKV86-0839

H3103
FROM TO
PIN #. PIN #
1
6
2

MKV86-0840

4-8

H3190

E3
A

20 MA LOOP

~
ED j~~:~'~'
TRANSMI?~r--r---r---~

UN'.

DOD

~~~
E3

x
LINES 2&3. 4&5 ANO 6&7 ARE STAGGERED THE SAME WAY

DOD

~~~

H3195 & H3196
Pin Number

Signal

1,3,4,5
35, 41, 44
6, 11
7, 12
9, 37
10,38
13, 15
50,17,14
16,34
47, 18, 20
48, 19, 21
45, 39
46,40

Connector Identity Code
Ground and Receiver Inputs
Data A
Data B
RTS/C A, DCDII A
RTS/C B, DCDII B
Local Loop, Test Indicator
Speed, Ring Indicator, and Speed Indicator
Remote Loop, DSR A
Clock A
Clock B
DTR A, CTS A
DTR B, CTS B

29,27
30,28
25,23,31
26, 24, 32

V.35 Data A
V.35 Data B
V.35 Clock A
V.35 Clock B

4-9

H3197

CCITT No.

NAME

NOT USED

NOTUSED~
NOTUSED~

PIN 1
PIN 25

o
o
o
o
o
o
o
o
o

103
104
105

106

109

107

DSR

108.2

DTR

125

PIN 14

~
~

PIN 13

25-WAY D-TYPE
CONNECTOR (MALE)

RE152

4-10

H3198

RS-422

RS-423

SPEED INDICATE

Tx DATA (A)
Tx CLOCK (A)
Rx DATA (A)
RTS/C (A)
Rx CLOCK (A)
CTS (A)
LOCAL LOOP
DSR (A)
DTR (A)
DCDII (A)

Tx DATA (A)
Tx CLOCK (A)
Rx DATA (A)
RTS
Rx CLOCK (A)
CTS(A)
LOCAL LOOP
DSR (A)
DTR(A)
DCDII (A)

RI
SPEED
CLOCK (A)
TEST I

•
2

•
4

DCE GROUND

Tx DATA (B)
Tx CLOCK (B)
Rx DATA (B)
RTS/C (B)
Rx CLOCK (B)
CTS (B)

DTE GROUND
Tx CLOCK (B)
Rx DATA (B)
DTE GROUND
Rx CLOCK (B)
CTS(B)

DSR (B)
DTR (B)
DCDII (B)
NC
NC
NC
CLOCK (B)
NC
DTE GROUND

DSR (B)
DTE GROUND
DCDII (8)
NC
NC
NC
DTE GROUND
NC
DTE GROUND

PIN 20

8
9
10
11

12
13
14

•

15
16

i7
18
19

•

DCE GROUND

PIN 1

•

22
23
~

24
25

0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0

0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0

27
28

•

PIN 19

29
~

30
3i
32

33
34

PIN 37

37-WAY D-TYPE
CONNECTOR
(FEMALE)

as
37

-...

RE153

4-11

H3199

Pin Number

Signal

1, 2, 3, 4, 5
35,41,44
6, 11
7, 12
9,37
10,38
13, 15
16, 34
17,50
47, 18, 20
48, 19, 21
45,39
46, 40
33, 14
8,42
36,43
29,27
30,28
25, 23, 31
26, 24,32
22, 49

Cable Code - All Grounded
Grounds and Receiver Inputs
Data - Channel A
Data - Channel B
RTS/C, DCD/I - Channel A
RTS/C, DCD/I - Channel B
Local Loop, Test Indicator
Remote Loop, DSR - Channel A
Speed Select, Ring Indicate
Clock, RX Clock, TX Clock - Channel A
Clock, RX Clock, TX Clock - Channel B
DTR, CTS - Channel A
DTR, CTS - Channel B
DTR, Test 4
Data, Test 1
RTS, Test 2
V.35 Data - Channel A
V.35 Data - Channel B
V.35 Clock - Channel A
V.35 Clock - Channel B
Clock, Test 3

4-12

83248
H3248
SINGLE LINE
LOOPBACK
CONNECTOR
~

18
25

H3249

17
15

J3 I I
••••••

FRONT VIEW

H3248 SINGLE LINE
TEST CONNECTOR
(PLUGS INTO J4·J12 OR
END OF A BC22 CABLE

II
I I

MKV84·1S55

22
23

MKV84-0798

H32S0
~

000

AUX ClK +
TX ClK OIFF +

OBOOOAOC

OF OJOEOH

AUX ClK-

y
'!i

TX ClK OIFF-

RX ClK OIFF +

~~()M
OV~OS
OPW
0.'

RX ClK OIFF-

TX DATA DIFF +
RX DATA OIFF +

OZOb

TX DATA DIFF -

0 1()gOhOP

RX DATA DIFF RTS

()d

[lID

........

H3249 STAGGERED
TEST CONNECTOR
(USED IN PLACE
OF DISTRIBUTION
PANEL)

o
REAR VIEW

()c

on()kamOi

CTS
CDET

DTR

000

DSR

1
I

1
I
f

t!
~

'-.,...I
H3250
MKV84·0799

4-13

H3251
H3251

J1
1

SHIELD GROUND
SIGNAL RATE INDICATION
SEND DATA +
SEND TIMING +
REC DATA +
REQ TO SEND +
REC TIMING +
CLEAR TO SEND +
LOCAL LOOP
DATA MODE +
TERMINAL READY +
RECEIVER READY +
REMOTE LOOP
INCOMING CALL
SIGNAL RATE SEL
TERMINAL TIMING +
TEST MODE
SIGNAL GROUND
RECEIVE COMMON

SEND DATASEND TIMINGREC DATA REQ TO SENDREC TIMING CLEAR TO SENDTERMINAL IN SERVICE
DATA MODETERMINAL READY RECEIVER READYSELECT STANDBY
SIGNAL QUALITY
NEW SIGNAL
TERMINAL TIMINGSTANDBY INDICATION
SEND COMMON

•
2

•
4

I
I

1
~
9

10
11
12

~ 20

1}
14

<ll)<6)
<ll)<6)

•

~Q;)

~
17

IQ;)

Q;)i

(6)Q;)

•

~
24

I
I

Q;)<ll)

!!fo

28
29

H3251

~
36
37

MKV87-1295

4-14

H3254

Jl
NUll ClK +
REC ClK +
TX ClK +
NUllClK REC ClKTX ClK TX DATA R DATA +
TX DATA +
R DATA
RTS
CTS
REC ROY
TER ROY
DATA MODE
TXINT

TT
AA
S

KK
K

BB
DO

SIDE 1
H3254

RECINT
TXINT
RECINT

MKV84·0800

4-15

H3255

(7\,
SEND COMMON

:.;.

REC COMMON

-'""

TER IN SER

INCOMING CALL
TER ROY -+
DSR

SEND DATA -+

-..

J
J

L
N

SEND TIMING +

RECTIMING +

NULL CLK-

SEND TIMING~

RTS +

y.
T

CTS +

Bji

REC,RDY +
NEW SIGNAL

-....

SIGNAL QUALITY

SEL SIGNAL RATE

J
J

* SEC REC DATA

*SEC RTS
* SEC CTS

+
+

SIDE 1

R_R

tiN
P

+
+

TH1

* SEC SEND DATA

SIGNAL RATE IND

TH2

H3255

LOCAL LOOP

TEST MODE

SEL STAND BY

STAND BY IND
RTS -

REC RDY -

J
J

NULL CLK +

TER ROY

REC DATA-

DSR

REC DATA -+

RECTIMING -

SEND DATA-

CTS

PP
H

NOT REQUIRED FOR DMP11
MKV86-083e

4-16

H3259
SIGNAL FLOW

r--.

TRANS SIG ELMT TIMING

RCV SIG ELMT TIMING

1
\

W1
I

SIGNAL RATE SEL

UNASSIGNED PIN

SECONDARY REQ TO SEND

SECONDARY TRANSMIT

SIGNAL QUALITY DETECTOR

SPEED INDICATOR (212A)

SECONDARY RECEIVE

\~::::::::::::p 0]

2
TRANSMIT DATA
RECEIVE DATA

LOCAL LOOP

1
TEST CONNECTOR
OUTLINE

DATA SET READY

DATA TERMINAL READY

RING INDICATOR

REQUEST TO SEND
CLEAR TO SEND
CARRIER

',--,
MKV84·1275

H3260
TEST MODE
SIGN QUAL
SF/RL

MR~~

SEND DATA
RX DATA
SEND DATA
(RS422)

1~
~-------------~-..~

TERM TIMING
SEND TIMING
RX TIMING
TERM TIMING
(RS422)
CLEAR TO SEND
REO TO SEND
RX ROY
INCOMING CALL
TERM ROY
DATA MODE
DATA MODE RET
(LOCAL LOOP)
SEND TIM RET
RX TIM RET
TERM TIM RET
(RS4221

____________~7-~

B~:

RS422
W6~RS423
W5~

W4~---·W2
W3~---'Wl

D~:
~~

H3260

E~
K~:o-------r:--,
W6

SEND DATA RET
RX DATA RET

NOTE: 1. W1 &W2IN
WJ,-W60UT

RS·423·A TESTING

2. Wl & W2 OUT \ RS.422.A TESTING
WJ,-W6IN
I
MKII84-1278

4-17

"3271

H3271

PIN
20

TRANS 0

PIN
26

12
1

DTRO

'23

I
I

:3
1

REC 0 •

REC 1
RI1
CO 1

I
I

:'9

14
1

COO :
RIO

1
122

!24

DTR 1
TRANS 1

NOTE
LINES 2 & 3, 4 & 5 AND 6 & 7 ARE
STAGGERED THE SAME WAY
MK-2501

4-18

"3272

C _U_----. J
C-'----'nL.---__'J
j

- - - I

H3272
TEST CONNECTOR
OUTLINE

RTSQ - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - . . CTS1
SEC XMITO ------------------------------------~.~ SECREC1

LOCAL
LOOP 0

------------------------------------~.~ OSR1

TRANSMIT 0 -------------------------------------.~ RECEIVE 1
OTRO

---------------------r----------------.

RING 1

.....-------~ CARRIER 1
LINEO

LlNE1
CTSO ~.~----------------------------------- RTS1
SEC REC 0

•

SEC XMIT 1

OSR 0

•

LOCAL
LOOP 1

RECEIVE 0 ....~------------------~--------------- TRANSMIT 1
RING 0 ..:~--------r------------------- OTR 1
CARRIER 0

NOTE: LINES 2 & 3, 4 & 5, 6 & 7 ARE STAGGERED IN THE SAME WAY.
SIGNAL FLOW

4-19

H3273
3
A

[l.

::>
w
Cl

C/)

**
* INDICATE CAVITIES USED TO
MOUNT STRAIN RELIEF .
STRAIN RELIEF
MK-2542

H3274

70-17029
MALE PIN B

MALE PIN C

!}::::3

:::>

!}::::3

f1\ 70-17028-00 IS INSTALLED ONTO PINS BAND C
\:..J OF THE MI1188 I/O CONNECTOR ON THE

VT100 XA OR XB
ALSO INSTALLED ONTO PINS BAND C
OF 70-16428 CABLE

70-17028
FEMALE PIN B

FEMALE PIN C

~ ~

70-17029-0-0 IS INSTALLED INTO PINS
BAND C OF THE BC20S CA8LE

4-20

H3276
JUMPERS

0
»
00
00
00
00
00
:><: ,...
[II

C/I

0
MKV84·0780

H3277

++++++++++++·+·+·.+S
+~~~+++.~~.+~~+++.~+

++++++++~++++++++.++

m+~+++++++++++++++++

MKV86·0841

H8568

MKV84·0783

4-21

H8611

TX SERIAL OUT
LINE

>8
q

111

LINE

~
'::j

~
C;

RX SERIAL IN
TX SERIAL OUT

RX SERIAL IN

TX SERIAL OUT

RX SERIAL IN
TX SERIAL OUT

LINE

III':::J

G1§
~

LINE

RX SERIAL IN

TX SERIAL OUT

RX SERIAL IN

S
5

Ce~
C~

INDICATES CAVITIES ARE NOT USED

LINE

TX SERIAL OUT

RX SERIAL IN

TX SERIAL OUT

RX SERIAL IN

TX SERIAL OUT

RX SERIAL IN

MK·2544

4-22

H8612

DATA SET BUSY 00

DATA SET BUSY 01

J1
,-..,
r~
B

0- r-F

DATA SET BUSY 02

...,

ASYN H

DATA SET BUSY 03

~
K

EIA RCV DATA 00

t rM r-0-

EIA RCV DATA 01

EIA XMIT DATA 00

B •• A

0.0 C
F .0 E
J .0 H
L .0 K

~ t--

>.J

5- rEIA XMIT DATA 01

N.O M
R .0 P

DV11 BUSY 00

T.OS

V.O U
X.O W
Z O. Y
BB O. AA
DO O. CC
FF O. EE
JJ O. HH

r~
V

IN r-

DV11 BUSY 01

DV11 BUSY 02

DV11 BUSY 03

EIA XMIT DATA 02

i--

Be
0- rcc

0- r-

EIA XMIT DATA 03

* INDICATES CAVITIES ARE NOT USED

EIA RCV DATA 02

~~ r~

~ r-

EIA RCV DATA 03

I KK

LL
o- r-

MM
...,

~ r~
....,

~ r~
...,

-g:. r-

tJ,..U

w
0r-o:!::MK-2545

4-23

M974

TTL OATA OUT
TTL DATA IN

8~
8
C2

TTL DATA OUT 1

TTL DATA OUT

TTL DATA OUT
TTL DATA IN

TTL DATA IN

O~
13]

TTL DATA OUT
TTL DATA IN

10~

TTL DATA IN

TTL DATA OUT 11

TTL DATA IN

TTL DATA OUT

TTL DATA OUT
TTL DATA IN

TTL DATA IN

331

TTL DATA OUT 4

TTL DATA IN

TIL DATA OUT

TTL DATA OUT 2
TTL DATA IN

TTL DATA IN

7~
Ul

TTL DATA OUT

15~
15

XMIT ......!..._ _ _ _ _ _ _ _-..:....1 REC

_---2~SHIELD

X . . ___

SHIELD ..::!-_ _ _ _ _ _

4-24

14~

TTL DATA IN

12-12528

SHIELD

13~

TTL DATA IN

12~

TTL DATA IN

TTL DATA OUT

11~

.:<.3 SHIELD

29-24929-00

29-24929-00
RX DTA (n+1)

• TEST MODE (n+1)
• RING (n+1)
• RX DATA (n)

(FRONT VIEW)

•
• CTS (n+1). CARRIER (n+1)
• DSR (n+1)

TX DATA (n)
RST (n)
DTR (n)
LOCAL LOOP (n)
DATA RATE SELECT (n)
TX DATA (n+1)
RTS (n+1)
DTR (n+1)
LOCAL LOOP (n+1)
DATA RATE SELECT (n+1)

o
101"...•............@
10\-::::::..../9

CTS (n). CARRIER (n)

• DSR (n)

10\-:::"::":101

TEST MODE (n)

!O\·:....·~·..···tO!

---------.

(BACK VIEW)

RING (n)

(n) WHERE n EQUALS THE LINE NUMBER.
MKV84·0781

H3257/H3258

H3258

H3257

TERMINATOR
(FEMALE)

TERMINATOR
(MALE)
MK-2244

H8570
TERMINATOR (M)
MKV84·1277

4-25

CHAPTER 7
EIA/CCITT DATA

7.1 INTRODUCTION
This chapter provides a summary listing of the signal functions associated with each of the EIA and/or
CeITT standards that are supported by the communications devices contained in this manual. The
connector pin assignments (at the modem) for each signal are also included. Table 7-5 provides a crossreference showing the relationship between each of the supported standards.

7-1

Table 7-1

RS-232-C Interface Pin/Signal Designations
CCITT Circuit
Equivalent

Circuit

Direction

Function

1
2
3
4
5

AA
BA
BB
CA
CB

To Modem
From Modem
To Modem
From Modem

Protective Ground
Transmitted Data
Received Data
Request To Send
Clear To Send

6
7
8
9
10

CC
AB
CF

105

106
107

From Modem
(From Modem)
(From Modem)

Data Set Ready
Signal Ground
Data Carrier Detector
(Positive DC Test Voltage)
(Negative DC Test Voltage)

SCF
SCB
SBA
DB

From Modem
From Modem
To Modem
From Modem

Unassigned
Secondary Carrier Detector
Secondary Clear To Send
Secondary Transmitted Data
Transmitter Clock (Internal) 114

16
17
18
19
20

SBB
DD

Secondary Received Data
Receiver Clock
Receiver Dibit Clock
Secondary Request To Send
Data Terminal Ready

119
115

SCA
CD

From Modem
From Modem
To Modem
To Modem
To Modem

21
22
23
24
25

CG
CE
CH/CI
DA
CN

From Modem
From Modem
To Modem
To Modem
To Modem

Signal Quality Detector
Ring Indicator
Data Rate Selector
External Transmitter Clock
Force Busy

110
125
111/112
113

11
12
13
14
15

From Modem

101

103
104

RS-232-C Voltage Standards
Measured at the Receiver Circuit:
Data
-25 V<LOGICAL / 1<-3 V(MARK)
+25 V>LOGICAL / 0>+3 V(SPACE)
Control
-25 V<LOGICAL / 0<-3 V(NEGATION)
+25 V>LOGICAL / 1>+3 V(ASSERTION)

7-2

102

109

122
121
118

120

108.2

Table 7-2

RS-449 (Physical Standard) Interface Pin/Signal Designations
Circuit
Equivalents

Circuit

I
2
3
4
5

SHIELD
SI
SPARE
SD
ST

6
7
8
9
10

Direction

Function

RS-232-C

CCITT

From Modem

Protective Ground
Signal Rate Indicator

112

To Modem
From Modem

Send Data (+)
Send Timing (+)

BA
DB

103
114

RD
RS
RT
CS
LL

From Modem
To Modem
From Modem
From Modem
To Modem

Receive Date (+)
Request To Send (+)
Receive Timing (+)
Clear To Send (+)
Local Loop

BB
CA
DD
CB

104
105
115
106
141

II
12
13
14
15

DM
TR
RR
RL
IC

From Modem
To Modem
From Modem
To Modem
From Modem

Data Mode (+)
Terminal Ready (+)
Receiver Ready (+)
Remote Loop
Incoming Call

CC
CD
CF

107
108.2
109
140
125

SF/SR

To Modem

17
18
19
20

TT
TM
SG
RC

To Modem
From Modem
To Modem
From Modem

Select Frequency
Signal Rate Select
Terminal Timing (+)
Test Mode
Signal Ground
Receive Common

21
22
23
24
25

SPARE
SD
ST
RD
RS

To Modem
From Modem
From Modem
To Modem

Send Data (-)
Send Timing (-)
Receive Data (-)
Request To Send (-)

26
27
28
29
30

RT
CS
IS
DM
TR

From Modem
From Modem
To Modem
From Modem
To Modem

Receive Timing (-)
Clear To Send (-)
Terminal in Service
Data Mode (-)
Terminal Ready (-)

31
32
33
34
35

RR
SS
SQ
NS
TT

From Modem
To Modem
From Modem
To Modem
To Modem

Receiver Ready (-)
Select Standby
Signal Quality
New Signal
Terminal Timing (-)

36
37

SB
SC

From Modem
To Modem

Standby Indication
Send Common

7-3

CE
CH
DA
AB

126
111
113
142
102
102b

116
110

117
102a

Table 7-3

CCITT/V .35 Interface Pin/Signal Designations
Circuit
Equivalents
Direction

Function

CCITT
RS-232

RS-449

101
102
105
106

To Modem
From Modem

Protective Ground
Signal Ground
Request To Send
Ready for Sending

AB
CA
CB

SG
RS
CS

From Modem
From Modem
To Modem
To Modem
From Modem

Data Set Ready
ReV Line Signal Det
Connect Data Set
Data Terminal Ready
Calling Indicator

CC
CF

DM
RR

107
109
108/1
108/2
125

CD
CE

TR
IC

R
T
V
X

104
104
115
115

From Modem
From Modem
From Modem
From Modem

Received Data A
Received Data B
Receive Timing A
Receive Timing B

RD
RD
RT
RT

Y
AA
P
S

114
114
103
103

From Modem
From Modem
To Modem
To Modem

Transmit Timing A
Transmit Timing B
Transmit Data A
Transmit Data B

113
113

To Modem
To Modem

Terminal Timing A
Terminal Timing B

Circuit

A
B
C
D

E
F
H

7-4

DD
DB
BA
DA

ST
ST
SD
SD
TT

Table 7-4

RS-366 ACU Interface Pin/Signal Designations

Direction

ACU
Designation

Function

2
3
4
5

To ACU
From ACU
To ACU
From ACU

FGD
DPR
ACR
CRQ
PND

Frame Ground
Digit Present
Abandon Call, Retry
Call Request
Present Next Digit

6
7
8
9
10

From ACU

PWI
SGD

From ACU
From ACU

Power Indicator
Signal Ground
Not Used
+ DC Test Voltage
- DC Test Voltage

From ACU
To ACU
To ACU

DSS
NBI
NB2

Not Used
Not Used
Data Set Status
Number Bit Weight I
Number Bit Weight 2

To ACU
To ACU

NB4
NB8

From ACU

DLO

Pin
I

12
13
14
15
16
17
18
19
20
21
22
23
24
25

Table 7-5

Number Bit Weight 4
Number Bit Weight 8
Not Used
Not Used
Not Used
Not Used
Data Line Occupied
Not Used
Not Used
Not Used

EIA/CCITT Standards Equivalency

EIA Electrical
Characteristic
Standard

EIA Interchange
Circuit
Definition
Standard (DCE
to DTE) with
Connector

CCrIT
Electrical
Characteristic
Standard

CCITT Interchange Circuit
Definition
Standard (DCE
to DTE) Without Connector

Recommended
CCITT Interchange
Connector

RS-232-C

CCITT V.28

CCITT V.24

ISO 2110

RS-423-A

RS-449

CCITT V.1O/X.26

CCITT V.24

ISO 4902

RS-422-A

RS-449

CCITT V.ll/X.27

CCITT V.24

ISO 4992

N/A

CCITT V.35

CCITT V.24

ISO 2593

7-5

CHAPTER 8
VENDOR MODEM PRODUCTS

8.1 INTRODUCfION
This chapter contains a summary of the operational characteristics of some of the more commonly used
modems and the option variations available with each of them.
Also included is the DIGITAL recommendation for configuring each of the options for optimum
performance.
Table 8-1
Device
Type

Characteristic Summary for Selected Modems
Speed

Auto
Answer
Dial

Remote
Testing

Line

Operation

1031

0-300 bits/s
(A sync)

Yes

With
801
ACU

Yes

Switched

Half-Duplex or
Full-Duplex
(2 Wire)

108

0-300 bits/s
(A sync)

Series 2000
or 3002

Full-Duplex
(2 Wire)

113

0-300 bits/s
(Async)

Yes

Switched

Half-Duplex or
Full-Duplex
(2 Wire)

113A

0-300 bits/s
(Async)

Yes

Switched

Manual
Originate
Full-Duplex
(2 Wire)

201C

2400 bits/s
(Sync)

Yes

With
801
ACU

Yes

Switched or
3002 Private
Channel

Half-Duplex
(2 Wire)
Full-Duplex
(4 Wire)

202S

1200 bits/s
No conditioning 1800
bits/SC2
conditioning
(A sync)

Yes

With
801
ACU

Yes

Switched
Series 2000
or Private
Line Series
3000

Half-Duplex
(2 Wire)

8-1

Table 8-1
Device
Type

Characteristic Summary for Selected Modems (Cont)

Speed

Auto
Dial
Answer

Remote
Testing

Line

Operation

202T

Same as
202S

Yes

2 or 4 Wire
Series 3000
Private Line

Half-Duplex
(2 Wire)
Full-Duplex
(4 Wire)

208A

4800 bits/s
(Sync)

Yes

4 Wire 3002
Private Line

Full-Duplex
(4 Wire)

208B

4800 bits/s
(Sync)

Yes

With
801
ACU

Yes

Switched

Half-Duplex
(2 Wire)

209A

1-9600 bits/s
Channel, or
1-7200 bits/s
and
1-2400 bits/s
Channels
or
2-4800 bits/s
Channels
or
4-2400 bits/s
Channels
(Sync)

Yes

3002 with D1
Conditioning

Full-Duplex
(4 Wire)

212A

0-300 bits/s
Async, or
1200 bits/s
Char Async, or
1200 bits/s Sync

Yes

With
801
ACU

Yes

402C

0-600 bits/s

Yes

With
801
ACU

Yes

Switched
2000 or 3002
Private Line

Half-Duplex
(2 Wire) or
Full-Duplex
(4 Wire)

500A
DSU

2.4K,4.8K
9.6K,56K
Sync

Yes

4 Wire DDS

Full-Duplex
Half-Duplex

501A
DSU

9.6K,56K
Sync

Yes

4 Wire DDS

Full-Duplex
Half-Duplex

510A
DSU

2.4K,4.8K

Yes

4 Wire DDS
Multiport

Full-Duplex
Half-Duplex

8-2

Full-Duplex
(2 Wire)

Table 8-1
Device
Type

Characteristic Summary for Selected Modems (Cont)
Speed

Auto
Answer
Dial

Remote
Testing

Line

Operation

550A
CSU

56K Sync

N/A

4 Wire DDS

Analog

551A
CSU

56K Sync

N/A

4 Wire DDS

Analog

Table 8-2

Modem Options

Modem

Option

Designation

DIGITAL
Recommendation

103J

Receive Space
Disconnect

Yes

Send Space
Disconnect

Yes

Loss of Carrier
Disconnect

CC Indication

Early

CB and CF
Indications

Separate

CC Indication
for Analog Loop

Auto Answer

Yes

Failsafe State
of CN Circuit

Off

Tip/Ring
Make Busy

Ground

Common

V
W
X
Y
Z

In
Out
In
Out
In

108

To Be Supplied

113B

Common Ground
CB/CF Indication
CN Control
Tip/Ring Force Busy
Data Terminal Control
of Disconnect

8-3

Table 8-2

Modem Options (Cont)

Modem

Option

Designation

DIGITAL
Recommendation

201C

Ground

Common

Transmitter Timing

Internal

Auto Calling

ByACU

As required

Auto Answer

Under DTR control

Ring Indication

EIA RS-232 on pin 22

Line Interface

4 wire private
(Full-duplex)

Carrier Control

Switched,7 ms delay

New Sync

Not used

Carrier Detector
Sensitivity

ZU
ZV

- 24 dBm private wire
-44 dBm switched net

Receive Data Squelch

156 ms

Soft Carrier Turnoff

24 ms

Clear To Send Delay

180 ms

Fast Carrier
Detection

Out (23 ms)

Received Data Clamp

In (Required)

Local Copy Primary
Channel

Out

Reverse Channel

ZC
ZD

As required
(In or out)

Local Copy
Reverse Channel

Out

Auto Answer

Transmit Only

Out

CC Indicator In
Analog Loopback

Off

Ground

Common

202S

As required

801 ACU
8-4

Table 8-2

Modem Options (Cont)

Modem

Option

Designation

DIGITAL
Recommendation

202T

4 Wire Full-Duplex

Full-Duplex

2 Wire Half-Duplex

See Reverse
Channel Below

Half-duplex only
reconanaended for
controllers with full
naodem control and
2780 software package

Receive Data Squelch

156 ms

Soft Carrier Turnoff

24 ms

Clear To Send Delay

180 ms

Fast Carrier
Detection

Out (23 ms)

Received Data Clamp

In (Required)

Local Copy Primary
Channel

Out

Reverse Channel

ZC
ZD
ZK

In (As required)
Out
4 wire operation

Local Copy
Reverse Channel

Out

Carrier Detector
Reset

Out

Continuous Carrier

Out

Compromise
Equalization

Maximum (determined
by installer)
Minimum (to match
channel characteristics)

ZV
Ground

Conamon

Alternate Voice

A
B

Out (as required)
In

8-5

Table 8-2

Modem Options (Cont)

Modem

Option

Designation

208A

Transmitter Timing

Modem provides
transmitter clock

Carrier Control

Continuous carrier
(as required)
Switched carrier

XA
Request To Send

Continuous RTS (as
required)
Switched RTS

YS
YT

One Second
Holdover

208B

209A

DIGITAL
Recommendation

Enabled (recommended
for use with continuous carrier, selected above)
Disabled (recommended
for use with multipoint master station)

New Sync

Not used

CC Condition in
Analog Loopback

DSR asserted in
analog loop back

Alternate Voice

YI
Yl

Data auxiliary set
installed
No data auxiliary set

Automatic Retrain

Must be installed

Compromise
Equalizer

Must be disabled

Transmitter Timing

Internal

Auto Call

As required

CC Condition in
Analog Loopback

CC on when analog
loopback button is
pressed

Auto Answer

Yes

Transmitter Timing
Provided

Internal

Carrier Control

Switched

8-6

Table 8-2

Modem Options (Cont)

Modem

Option

212

Designation

DIGITAL
Recommendation

Request To Send
Control

Switched

Elastic Store

Out

Slaved Transmitter
Timing

Out

Data Set Ready (CC)
Condition in AL Mode
(Form Used in Test 4)

CC on

Grounding

AA not connected to
AB

Tip/Ring Make Busy

Out

CC Indication
Analog Loop

CN Circuit

Out

Transmitter Timing

Internal

1200 Baud Operation

Async/Start-Stop

Character Length

10 Bit

Receiver Respond
Digital Loop

Loss of Carrier
Disconnect

Out

Receive Space
Disconnect

CB and CF
Indications

Separate

Send Space
Disconnect

Auto Answer

8-7

Table 8-2

Modem Options (Cont)

Modem

Option

Designation

DIGITAL
Recommendation

Answer Mode
Indication

Off

Speed Mode

Dual

Interface Speed
Indication

Signal Ground to
Frame Connect

Table 8-3

801-C ACU Options

Option

Designation

DIGITAL
Recommendation

Call Termination

Z or A
G or ZD

After DSS via CRQ or
After DSS via data set

ACR Timer

Stop timer when DSS sets

DSS Transfer

Answer tone detection or at
'EON' code

Answer Detection

W
X

Detect end of answer tone
Detect beginning of answer tone
Detect 2025 tone
Detect 2225 tone

S
T
Ground Start

v
y

In
Out

Data Set Answer
Detection

Without 'EON'

Circuit

ZH
ZJ
ZK

2 wire
4 wire loop start
4 wire ground start

DLO Lead

ZM
ZL

80 I only control
80 I and dataset control

8-8

DF127

INTRODUCTION

DF127 MODEM
DF127 General Description
The DFI27 modem provides both half- and full-duplex, synchronous, binary serial data communications over
2- or 4-wire private/leased telephone network facilities. At high speed (4800 bits/s), the DF127 modem uses
8-phase differential phase shift keying (DPSK). At low speed (2400 bits/s), the DFl27 modem uses
quaternary differential phase shift keying (QDPSK).
The DFI27-AA modem consists of:
•
•

DFI27-AM modem module
DF 100-DT desktop enclosure

The DFI27-BB modem consists of the DF127-BM modem module.
Multiple modem enclosure available is the DFIOO-RM.
The DFI27-AM and DFI27-BM modem modules can also be installed into the DFM statistical
f'1 ulti plexer.
DFI27 registration numbers:
•
•

FCC: Not Required
DOC: 192 1040B

DF127-AM and DF127-BM Specifications
Data Rate
Low Speed

2400 bits/s

High Speed

4800 bits/s

Modulation
Low Speed

Quaternary differential phase shift keying (QDPSK)

High Speed

Eight-phase differential phase shift keying (DPSK)

Format

Synchronous binary stream data

Telephone Connectors

2- or 4-wire private/leased telephone network (P/LTN)

Compatibility

CCITT V. 27 bis

Interface Compatibility

EIA RS-232-C/CCITT V.24, V.28 compatible voltages

DF 127-1

DF127

INTRODUCTION

Communication Mode

Full-duplex over 4-wire and half-duplex over 2-wire

Interface Cables

BC22F or BCC04 (or equivalent) for synchronous operation

Signal Detect
Turn ON

-26 dBm

Turn OFF

-31 dBm

Operating Temperature

10°C to 40°C (50°F to 104°F)

Storage Temperature

-40°C to +66°C (-40°F to + 150°F)

Relative Humidity

10% to 90% noncondensing

Module Weight

0.635 kg (1.44 lb)

DC Power Requirements

+5 Vdc @ 0.900 A maximum
+12 Vdc @ 0.070 A maximum
-12 Vdc @ 0.250 A maximum

DF127 Reference Documentation
Refer to the following documents if the level of content in this section is insufficient:

•
•

DFl27 Modem Family User Guide
DFI27-B Series Modem Family Installation Guide

DF127-2

EK-DFI27-UG
EK-UK 127-IG

DF127

INSTALLATION

DF127-AM and DF127-BM Modem Options
The DF127 modem modules contain four jumpers and three switchpacks (Sl through S3) to select a
variety of options. Tables DFl27-l through DFl27-l0 list each of the jumpers and switches and the option
that is selected. Each module is shipped from the factory with preset options. In the tables, factory settings
are printed in blue. Refer to Chapter 8 for descriptions of the modem options.

PIGGYBACK
MODEM BOARD

LOCAL LOOP ( L L ) - - - . r - t
TEST PATTERN (TP) - - + t : : l
REMOTE LOOP (RL)---+-r:::t
DIGITAL LOOP (DL)-----+FALLBACK (FB) -----t~
NOTUSED---------~,

f -_ _ _ _ _ _ _ _ _ _- - ' l r - - - - - - i

INTERFACE
CONTROL
BOARD

MKV86-0808

Figure DF127-1

DF127-AM and DF127-BM (Version 2) Module Layout

DF127-3

DF127 INSTALLATION

Table DF127-1

DF127-AM and DF127-BM (Version 2) Jumper Descriptions

Jumper
Group

Pad

Description

1,2,3,4, & 6

Selects EIA pin 23 as speed indicate signal or speed select signal depending on
jumper configuration.

7,8,9, & 10

Allows the DTE to initiate local analog loopback (instead of the front panel LL
switch) by placing a positive signal on EIA pin 18.

11,12,13, & 14

Allows the DTE to initiate remote digital loopback (instead of the front panel RL
switch) by placing a positive signal on EIA pin 21.

1&2

Always installed for DFI27 modem.

1&2

Connects EIA pin 1 (protective ground) to modem ground. Normally this jumper is
left open.

1,2, & 3

Selects 2-wire or 4-wire mode.

Table DF127-2
Jumper

DF127-AM and DF127-BM (Version 2) Jumper Selections

In
1- 2
4- 6

Out
3- 4

Function
DTE selects modem speed by controlling EIA pin 23.

3- 4

1- 2
4-6

Allows the modem to indicate speed by placing a signal on EIA pin 23.

7- 8

9 - 10

Enables DTE to initiate LL.

9 - 10

7- 8

Disables DTE LL control.

11 - 12

13 - 14

Enables DTE to initiate RL

13 - 14

11 - 12

Disables DTE RL control.

1- 2

Selects V.27 mode. Always installed on DFI27-AM modem module.

1- 2

Connects EIA pin 1 (protective ground) to modem ground.

1- 2

Disconnects EIA pin 1 (protective ground) from modem ground.

1- 2

2-3

Selects 2-wire configuration.

2- 3

1- 2

Selects 4-wire configuration.

DF127-4

DF127

JUMPER J6

INSTALLATION

JUMPER J3

140-013
00
0-0
00

FACTORY USE
ONLY

0-0

JUMPER J5

2
1 OQ..P 3
JUMPER J7

SWITCH PACK S1 (E28t

SWITCHPACK S2 (E57)*

SWITCHPACK S3 (E50t

OFF

*STANDARD FACTORY SELECTIONS SHOWN
MKV85-1405

Figure DF127-2

DF127-AM and DF127-BM (Version 2) Switch pack Locations

DF127-5

DFl27 INSTALLATION

Table DF127-3

DFI27-AM and DFI27-BM (Version 2) Switchpack 1 Selections

Option

Selection

Transmit
Clock 1

External
Internal

ON
OFF

Equalizer
Sampling

T
T/2

Carrier
Control

RTS
Continuous

Loopback
Control

Bi-Direction
Uni-Direction

Squelch

Enabled
Disabled

Transmit
Clock 2

Slave
Independent

Carrier
Threshold

-26 dBm
-43 dBm

Data
Quality
Threshold

10-4
10- 3

RTS to
CTS & CD
(Notes 3 & 4)

<15 ms
Training

Remote
Loopback

Disabled
Enabled

S10

ON
OFF (Note 4)
ON
OFF (Note 4)
ON
OFF
ON
OFF (Note 4)
ON
OFF (Note 1)
ON
OFF
ON
OFF (Note 2)

ON
OFF

NOTES:
1. This option only applies when the Transmit Clock 1 option is set to Internal (switchpack 1, switch 1 OFF).

2. This option is enabled or disabled by switch pack 2, switch 1. When enabled, retraining occurs when the error
rate reaches the data quality threshold selected by switch pack 1, switch 8.
3. The training period varies with modem speed and the selection of switchpack 2, switch 3 (see below).

Speed

Long Interval
(Switch 3 OFF)

Short Interval
(Switch 3 ON)

Low
High

708 ms

50 ms

943 ms

66 ms

4. These options must be set to OFF when the DF127 modem is used in the DFM statistical multiplexer as an
integral modem.

DF127-6

DF127

INSTALLATION

DF127-AM and DF127-BM (Version 2)
Switch pack 2 Selections

Table DF127-4
Option

Selection

Data Quality
Retrain
(Notes 1 & 2)

Disabled
Enabled

ON
OFF

Round-Robin
Retrain
(Note 3)

Disabled
Enabled

Training
Interval
(Notes 2 & 4)

Short
Long

ON
OFF

NOT
USED

Reserved
NOTES:

I. This switch works together with switchpack I, switch 8.
2. This option must be set to OFF when the DF127 modem module is
used in the DFM statistical multiplexer as an integral modem.

3. This switch is valid only in RTS controlled carrier mode (switchpack
I, switch 3 ON). In continuous carrier mode, the round-robin feature
is always enabled, regardless of the position of this switch.

4. This switch selects the timing interval when switch pack I, switch 9 is
set to OFF. See below:

Speed

Long Interval
(Switch 3 OFF)

Short Interval
(Switch 3 ON)

High
Low

708 ms

943 ms

50 ms
66 ms

Table DF127-5

DF127-AM and DF127-BM (Version 2)
Switchpack 3 Selections

Option

Selection

Private
Line
XMIT
Level

o dBm
1 dBm
2 dBm
3 dBm
- 4 dBm
5 dBm
-

6 dBm
7 dBm
8 dBm
9 dBm
-10 dBm
-11 dBm
-12 dBm
-13 dBm
-14 dBm
-15 dBm

OFF
ON
OFF
ON
OFF
ON
OFF
ON
OFF
ON
OFF
ON
OFF
ON
OFF
ON

OFF
OFF
ON
ON
OFF
OFF
ON
ON
OFF
OFF
ON
ON
OFF
OFF
ON
ON

OFF
OFF
OFF
OFF
ON
ON
ON
ON
OFF
OFF
OFF
OFF
ON
ON
ON
ON

OFF
OFF
OFF
OFF
OFF
OFF
OFF
OFF
ON
ON
ON
ON
ON
ON
ON
ON

DF127-7

DF127 INSTALLATION

00
JUMPER J5

JUMPER J8

2QoQOOO Q '4
,60600-06'3

o
JUMPER J3
20
LOCAL LOOP (LL)
TEST PATTERN (TP)
REMOTE LOOP (RL) ~-'~'--I
DIGITAL LOOP (DL)
FALLBACK (FB) _ _-".~CJ

NOTUSED----~~

o
20-0 4

JUMPERJ6 ,00

MODEM
BOARD

INTERFACE
CONTROL
BOARD
MKV86-0803

Figure DF127-3

DF127-AM and DF127-BM (Version 3) Module Layout

DF127-8

DF127 INSTALLATION
Table DF127-6

DF127-AM and DF127-BM (Version 3) Jumper Descriptions

Jumper
Group

Pad

Description

9,11,12,13, & 14

Selects EIA pin 23 as speed indicate signal or speed select signal
depending on jumper configuration.

5,6,7, & 8

Allows the DTE to initiate local analog loopback (instead of the front
panel LL switch) by placing a positive signal on EIA pin 18.

1,2,3, & 4

Allows the DTE to initiate remote digital loopback (instead of the
front panel RL switch) by placing a positive signal on EIA pin 21.

1&2

Always installed for DF127 modem.

1& 2

Connects EIA pin 1 (protective ground) to modem ground. Normally
this jumper is left open.

1,2,3, & 4

Selects 2-wire or 4-wire mode.

Table DF127-7

DF127-AM and DF127-BM (Version 3) Jumper Selections

Jumper

Out

Function

11 - 12

9 - 11

DTE selects modem speed by controlling EIA pin 23.

9 - 11
13 - 14

11 - 12

Allows the modem to indicate speed by placing a signal on EIA
pin 23.

7- 8

5- 6

Enables DTE to initiate LL.

5- 6

7- 8

Disables DTE LL control.

3-4

1- 2

Enables DTE to initiate RL

1- 2

3- 4

Disables DTE RL control.

1- 2

Selects V.27 mode. Always installed on DFI27-AM modem
module.

1- 2

Connects EIA pin 1 (protective ground) to modem ground.

1- 2

Disconnects EIA pin 1 (protective ground) from modem ground.

1- 3

2-4

Selects 2-wire configuration.

2-4

1- 3

Selects 4-wire configuration.

DF127-9

DF127 INSTALLATION

JUMPER J8
JUMPER J5

20000000 14
160600-0613

o
JUMPER J3

20
10

o
20-0 4
JUMPERJ6 1 00 3

SWITCHPACK S2 *

SWITCH PACK S1 *

SWITCHPACK S3 *

1
ON
OFF

~~~~

*STANDARD FACTORY SELECTIONS SHOWN
MKV86-0806

Figure DF127-4

DF127-AM and DF127-BM (Version 3) Switch pack Locations

DF127-10

DF127 INSTALLATION

Table DF127-8

DF127-AM and DF127-BM (Version 3) Switchpack 1 Selections

Option

Selection

Transmit
Clock 1

External
Internal

ON
OFF

Equalizer
Sampling

T
T/2

Carrier
Control

RS
Continuous

Loopback
Control

Bi-Direction
Uni-Direction

Squelch

Enabled
Disabled

Transmit
Clock 2

Slave
Independent

Carrier
Threshold

-26 dBm
-43 dBm

Data
Quality
Threshold

10- 4
10- 3

RS to CS

<3 ms
50 ms

Remote
Loopback

Disabled
Enabled

S10

ON
OFF
ON
OFF
ON
OFF
ON
OFF
ON
OFF (Note 1)
ON
OFF
ON
OFF (Note 2)

ON
OFF (Note 3)
ON
OFF

NOTES:

This option only applies when the Transmit Clock 1 option is set to Internal.

This option is enabled or disabled by switch pack 2, switch 1. When enabled, retraining occurs when the error
rate reaches the data quality threshold selected by switch pack 1, switch 8.

This selection is valid only in continuous carrier mode (switchpack 1, switch 3=OFF) when the modems are
already trained. In RS controlled carrier mode, the RS to CS delay is dependent on modem speed and the
training interval selection of switchpack 2, switch 3.

DF127-11

DF127 INSTALLATION

Table DF127-9 DFI27-AM and DF127-BM (Version 3) Switchpack 2 Selections
Option

Selection

Data Quality
Retrain
(Notes 1 & 2)

Disabled
Enabled

ON
OFF

Round-Robin
Retrain
(Note 3)
Training
Interval
(Notes 2 & 4)
Reserved

Disabled
Enabled

ON
OFF

Short
Long

ON
OFF
NOT
USED

NOTES:
1.

This switch works together with switchpack 1, switch 8.

These options must be set to OFF when the DF127 modem module is used in the DFM statistical multiplexer as
an integral modem.

This switch is valid only in RS controlled carrier mode. In continuous carrier mode, the round-robin feature is
always enabled, regardless of the position of this switch.

This switch selects the timing interval (see chart below) when the RS controlled carrier option is selected
(switchpack 1, switch 3=ON).
Long Interval
Short Interval
(Switch 3 ON)
(Switch 3 OFF)
Speed

Table DF127-10

50 ms
66 ms

708 ms
943 ms

Normal (4800 b/s)
Fallback (2400 b/s)

DFI27-AM and DFI27-BM (Version 3)
Switchpack 3 Selections

Option

Selection

Private
Line
XMIT
Level

o dBm
-1 dBm
- 2 dBm
- 3 dBm
-4dBm
- 5 dBm
- 6 dBm
-7 dBm
- 8 dBm
- 9 dBm
-10 dBrn
-11 dBm
-12 dBm
-13 dBm
-14 dBm
-15 dBm

OFF
ON
OFF
ON
OFF
ON
OFF
ON
OFF
ON
OFF
ON
OFF
ON
OFF
ON

OFF
OFF
ON
ON
OFF
OFF
ON
ON
OFF
OFF
ON
ON
OFF
OFF
ON
ON

OFF
OFF
OFF
OFF
ON
ON
ON
ON
OFF
OFF
OFF
OFF
ON
ON
ON
ON

OFF
OFF
OFF
OFF
OFF
OFF
OFF
OFF
ON
ON
ON
ON
ON
ON
ON
ON

DF127-12

DF127

INSTALLATION

Installing the Modem Module
Since the DF127-AM and DF127-BM modem modules are packaged individually, the modem module must
be installed into the standalone or multiple modem enclosure before connecting to the network. Refer to the
Desktop Enclosure section in Chapter 5 for installation of the DF 127 -AM and OF 127 -BM modem modules
into the DFIOO-DT desktop enclosure. Refer to the Rack Mount Enclosure section in Chapter 5 for
installation into the DFIOO-RM multiple modem enclosure.
Refer to Chapter 6 for installation of the DF127-AM and DFI27-BM modem modules into the OFM
statistical multiplexer.

Installing the Modern
The DF127 modem can be installed to a private/leased line. Refer to Chapter 5 for installation of the
modem to private line telephone services.

NOTE
DF127-AM modem modules up to serial number
NQ01800 are designed for use with the DFM statistical multiplexer only, and should not be used in any
other enclosure. Modules above serial number
NQ01800 can be used in any of the available
enclosures.

OF127-13

DF127

TESTING

General
Diagnostic testing of the DF127-AM, -BM modem module exists for the following types of tests:
•

Power-Up Self-Test

•

Local DTE Test

•

Local Analog Loopback Test
Set LL switch on local modem

•

Local Analog Loopback Self-Test
Set LL and TP switches and verify TM indicator

•

Digital Loopback Self-Test
Set DL switch on local modem, TP switch on remote modem, and verify TM indicator on
remote modem

•

Remote Digital Loopback Test
Set RL switch on local modem

•

Remote Digital Loopback Self-Test
Set TP and RL switches on local modem and verify TM indicator on local modem

•

End-To-End Self-Test
Set TP switch on both modems and verify TM indicator on both modems

Refer to Chapter 7 for the test procedures for the DFI27-AM and DF127-BM modem modules.

DF127-14

NOTES

DFl29 INTRODUCTION
DF129 MODEM
DFl29 General Description
The DF129 modem provides full-duplex, synchronous, binary serial data communications over 4-wire
private/leased telephone network facilities. At high speed (9600 bits/s), the DF129 modem uses 16-point
quadrature amplitude modulation (QAM). At the low speed of either 7200 bits/s or 4800 bits/s, the DF129
modem uses either 8-point quadrature amplitude modulation (QAM), or quaternary differential phase shift
keying (QDSPK).
The DFI29-AA modem consists of:
•
•

DFI29-AM modem module
DFIOO-DT desktop enclosure

The DFI29-BB modem consists of the DFI29-BM modem module.
The multiple modem enclosure available is the DFIOO-RM.
The DFI29-AM and DFI29-BM modem modules can also be installed into the DFM statistical
multiplexer.
OF 129 registration numbers:
•
•

FCC: Not Required
DOC: 192 1040B

DFI29-AM and DF129-BM Specifications
Data Rate
Low Speed

4800 bits/s or 7200 bits/s

High Speed

9600 bits/s

Modulation
Low Speed

4800 bits/s quaternary differential phase shift keying (QDPSK)
7200 bits/s 8-point quadrature amplitude modulation (QAM)

High Speed

9600 bits/ s 16-point quadrature amplitude modulation (QAM)

Format

Synchronous binary stream data

Telephone Connections

4-wire private/leased telephone network (PLTN) capable of supporting 9600 bits/ s communications

DF129-1

DF129

INTRODUCTION

Compatibility

CCITT V.29

Communications Mode

Full-duplex at all data rates

Interface Compatibility

EIA RS-232-CjCCITT V.24 compatible voltages

Interface Cables

BC22F or BCC04 (or equivalent) for synchronous operation

Signal Detect
Turn ON

-26 dBm

Turn OFF

-31 dBm

Operating Temperature

10°C to 40°C (50°F to 104°F)

Storage Temperature

-40°C to +66°C (-40°F to + 150°F)

Relative Humidity

10% to 90% noncondensing

Module Weight

0.635 kg (l.44 lb)

DC Power Requirements

+5 Vdc @ 0.900 A maximum
+12 Vdc @ 0.070 A maximum
-12 Vdc @ 0.250 A maximum

DF129 Reference Documentation
Refer to the following documents if the level of content in this section is insufficient:

•
•

DF129 Modem Family User Guide
DF129-B Series Modem Family Installation Guide

DF129-2

EK-DFI29-UG
EK-UKI29-IG

DF129

INSTALLATION

DF129-AM and DF129-BM Modem Options
The DF129 modem modules contain four jumpers and three switch packs (Sl through S3) to select a
variety of options. Tables DF129-1 through DF129-1O list each of the jumpers and switches and the option
that is selected. Each module is shipped from the factory with preset options. In the tables, factory settings
are printed in blue. Refer to Chapter 8 for descriptions of the modem options.

PIGGYBACK
MODEM BOARD

LOCAL LOOP (LL)---+[:::t
TEST PATTERN (TP) - - + t : : J
REMOTE LOOP (RL)---+l::::::l
DIGITAL LOOP (DL)-----+
FALLBACK (FB) - - -____~
FALLBACK SPEED (FS)-.......-

r'--_ _ _ _ _ _ _ _ _ _~.------f

INTERFACE
CONTROL
BOARD

SWITCHPACK 3
SWITCHPACK 2
MKV86-0804

Figure DF129-1

DF129-AM and DF129-BM (Version 2) Module Layout

DF129-3

DF129

INSTALLATION

Table DF129-1

DF129-AM and DF129-BM (Version 2) Jumper Descriptions

Jumper
Group

Pad

Description

1,2,3,4, & 6

Selects EIA pin 23 as speed indicate signal or speed select signal depending on
jumper configuration.

7,8,9, & 10

Allows the DTE to initiate local analog loopback (instead of the front panel LL
switch) by placing a positive signal on EIA pin 18.

11,12,13, & 14

Allows the DTE to initiate remote digital loopback (instead of the front panel RL
switch) by placing a positive signal on EIA pin 21.

1&2

For factory use only.

1&2

Connects EIA pin 1 (protective ground) to modem ground. Normally this jumper is
left open.

1,2, & 3

Not used

Table DF129-2

DF129-AM and DF129-BM (Version 2) Jumper Selections

Jumper

Out

Function

1- 2
4-6

3- 4

DTE selects modem speed by controlling EIA pin 23.

3-4

1- 2
4-6

Allows the modem to indicate speed by
placing a signal on EIA pin 23.

7- 8

9 - 10

Enables DTE to initiate LL.

9 - 10

7- 8

Disables DTE LL control.

11 - 12

13 - 14

Enables DTE to initiate RL.

13 - 14

11 - 12

Disables DTE RL control.

1- 2

Connects EIA pin 1 (protective ground) to modem ground.
1- 2

Disconnects EIA pin 1 (Erotective Bround) from modem Bround.

DF129-4

DFl29

JUMPER J6

INSTALLATION

JUMPER J3

140-013
00
0-0
00

FACTORY USE
ONLY

0-0

JUMPER J5
00

2
10Qj)3
JUMPER J7

SWITCHPACK S1 (E28)*

SWITCH PACK S2 (E57)*

SWITCH PACK S3 (E50t

1 2
ON
OFF

3 4

~~~~

*STANDARD FACTORY SELECTIONS SHOWN
MKV85-1405

Figure DF129-2

DF129-AM and DF129-BM (Version 2) Switchpack Locations

DF129-5

DF129

INSTALLATION

Table DF129-3 DFI29-AM and DF129-BM (Version 2) Switchpack 1 Selections
Option

Selection

Transmit
Clock 1

External
Internal

ON
OFF

Equalizer
Sampling

T
T/2

Carrier
Control

RTS
Continuous

Loopback
Control

Bi-Direction
Un i-Direction

Squelch

Enabled
Disabled

Transmit
Clock 2

Slave
Independent

Carrier
Threshold

-26 dBm
-43 dBm

Data
Quality
Threshold

10-4
10- 3

RTS to
CTS & CD
(Notes 1 & 4)

<15 ms
253 ms

Remote
Loopback

Disabled
Enabled

S10

ON
OFF (Note 1)
ON
OFF (Note 1)
ON
OFF
ON
OFF (Note 1)
ON
OFF (Note 2)
ON
OFF
ON
OFF (Note 3)
ON
OFF
ON
OFF

NOTES:
1. These options must be set to OFF when the DF129 modem is used in the DFM statistical multiplexer as an
integral modem.

2. This option only applies when the Transmit Clock 1 option is set to Internal (switchpack 1, switch 1 OFF).
3. This option is enabled or disabled by switchpack 2, switch 1. When enabled, retraining occurs when the error
rate reaches the data quality threshold selected by switchpack 1, switch 8.
4. This option is valid only in continuous carrier mode (switchpack 1, switch 3 OFF).

DF129-6

DF129 INSTALLATION

Table DF129-4 DFI29-AM and DF129-BM (Version 2)
Switchpack 2 Selections
Option

Selection

Data
Quality
Retrain

Disabled
Enabled

ON
OFF (Notes 1 & 2)

Round
Robin
Retrain

Disabled
Enabled

Training
Interval

Long
Short

ON
OFF (Note 3)
NOT
USED

Reserved

NOT
USED

NOTES:
1. This switch works together with switch pack 1, switch 8.
2. This option must be set to OFF when the DF129 modem module is
used in the DFM statistical multiplexer as an integral modem.
3. This switch is valid only in RTS controlled carrier mode (switchpack 1,
switch 3 ON). In continuous carrier mode, the round-robin feature is
always enabled, regardless of the position of this switch.

Table DF129-5 DFI29-AM and DF129-BM (Version 2)
Switchpack 3 Selections
Option
Selection
SI
S2
S3
Private
Line
XMIT
Level

o dBm
- 1 dBm
- 2 dBm
- 3 dBm
- 4dBm
- 5 dBm
- 6 dBm
- 7 dBm
- 8 dBm
- 9 dBm
-10 dBm
-11 dBm
-12 dBm
-13 dBm
-14 dBm
-15 dBm

OFF
ON
OFF
ON
OFF
ON
OFF
ON
OFF
ON
OFF
ON
OFF
ON
OFF
ON

DF129-7

OFF
OFF
ON
ON
OFF
OFF
ON
ON
OFF
OFF
ON
ON
OFF
OFF
ON
ON

OFF
OFF
OFF
OFF
ON
ON
ON
ON
OFF
OFF
OFF
OFF
ON
ON
ON
ON

S4
OFF
OFF
OFF
OFF
OFF
OFF
OFF
OFF
ON
ON
ON
ON
ON
ON
ON
ON

DF129 INSTALLATION

SEND DATA (SD)
RECEIVE DATA (RD)
CARRIER DETECT (CD)
CLEAR TO SEND (CS)
REQUEST TO SEND (RS)
SIGNAL QUALITY (SQ) - _ " " " " , , - , I
FALLBACK (FB) - - - - - - - i l H l
TEST MODE (TM)

JUMPER J5

JUMPER J8

2000 0 000 14
16060<x>613

o
JUMPER J3

LOCAL LOOP (LL) -----tK::i
TEST PATTERN (TP) --..-r=l
REMOTE LOOP (RL) --~:::J
DIGITAL LOOP (DL) --~::::J
FALLBACK (FB) - - - - - i K : : i
FALLBACK SPEED (FS)

SWITCH PACK 1
SWITCH PACK 2
SWITCH PACK 3

CONTROL
BOARD
MKV86-0805

Figure DF129-3

DF129-AM and DF129-BM (Version 3) Module Layout

DF129-8

DF129 INSTALLATION

Table DF129-6

DF129-AM and DF129-BM (Version 3) Jumper Descriptions

Jumper
Group

Pad

Description

9,11,12,13 & 14

Selects EIA pin 23 as speed indicate signal or speed select signal
depending on jumper configuration.

5,6,7, & 8

Allows the DTE to initiate local analog loopback (instead of the front
panel LL switch) by placing a positive signal on EIA pin 18.

1,2,3, & 4

Allows the DTE to initiate remote digital loopback (instead of the
front panel RL switch) by placing a positive signal on EIA pin 21.

1 &2

For factory use only.

1 &2

Connects EIA pin 1 (protective ground) to modem ground. Normally
this jumper is left open.

1,2,3, & 4

Not used

Table DF129-7

DF129-AM and DF129-BM (Version 3) Jumper Selections

Jumper

Out

Function

11 - 12

9 - 11

DTE selects modem speed by controlling EIA pin 23.

9 - 11
13 - 14

11 - 12

Allows the modem to indicate speed by placing a signal on EIA
pin 23.

7- 8

5- 6

Enables DTE to initiate LL.

5- 6

7- 8

Disables DTE LL control.

3- 4

1- 2

Enables DTE to initiate RL.

1- 2

3- 4

Disables DTE RL control.

Connects EIA pin 1 (protective ground) to modem ground.

1- 2
1- 2

Disconnects EIA pin 1 (protective ground) from modem ground.

DF129-9

DF129 INSTALLATION

JUMPER J5

JUMPER J8

200QOOOQ14
100000-0013

o
JUMPER J3

20
10

o
20-0 4
JUMPER J6 1 00 3

SWITCH PACK S1*

SWITCHPACK S2*

SWITCH PACK S3*

1 2
ON
OFF

~~~~

*STANDARD FACTORY SELECTIONS SHOWN
MKV86-0807

Figure DF129-4

DF129-AM and DF129-BM (Version 3) Switchpack Locations

DF129-10

DF129 INSTALLATION

Table DF129-8

DFI29-AM and DFI29-BM (Version 3) Switchpack 1 Selections

Option

Selection

Transmit
Clock 1

External
Internal

ON
OFF

Equalizer
Sampling

T
T/2

Carrier
Control

RS
Continuous

Loopback
Control

Bi-Direction
Uni-Direction

Squelch

Enabled
Disabled

Transmit
Clock 2

Slave
Independent

Carrier
Threshold

-26 dBm
-43 dBm

Data
Quality
Threshold

10-4
10-3

RS to CS

<15 ms
253 ms

Remote
Loopback

Disabled
Enabled

810

ON
OFF
ON
OFF
ON
OFF
ON
OFF
ON
OFF (Note 1)
ON
OFF
ON
OFF (Note 2)
ON
OFF (Note 3)
ON
OFF

NOTES:
1.

This option only applies when the Transmit Clock 1 option is set to Internal.

This option is enabled or disabled by switch pack 2, switch 1. When enabled, retraining occurs when the error
rate reaches the data quality threshold selected by switch pack 1, switch 8.

This selection is valid only in continuous carrier mode (switch pack 1, switch 3=OFF) when the modems are
already trained.

DF129-11

DF129 INSTALLATION

Table DF129-9

DF129-AM and DFI29-BM (Version 3) Switchpack 2 Selections

Option

Selection

Data Quality
Retrain
(Notes 1 & 2)

Disabled
Enabled

ON
OFF

Round-Robin
Retrain
(Note 3)

Disabled
Enabled

Training
Interval

Long
Short

ON
OFF
NOT
USED

Reserved

NOT
USED

NOTES:
1.

This switch works together with switch pack 1, switch 8.

This option must be set to OFF when the DF129 modem module is used in the DFM statistical multiplexer as
an integral modem.

This switch is valid only in RS controlled carrier mode. In continuous carrier mode, the round-robin feature is
always enabled, regardless of the position of this switch.

Table DF129-10

DFI29-AM and DF129-BM (Version 3)
Switchpack 3 Selections

Option

Selection

Private
Line
XMIT
Level

OdBm
- 1 dBm
- 2 dBm
- 3 dBm
- 4 dBm
- 5 dBm
- 6 dBm
- 7 dBm
- 8 dBm
- 9 dBm
-10 dBm
-11 dBm
-12 dBm
-13 dBm
-14 dBm
-15 dBm

OFF
ON
OFF
ON
OFF
ON
OFF
ON
OFF
ON
OFF
ON
OFF
ON
OFF
ON

OFF
OFF
ON
ON
OFF
OFF
ON
ON
OFF
OFF
ON
ON
OFF
OFF
ON
ON

OFF
OFF
OFF
OFF
ON
ON
ON
ON
OFF
OFF
OFF
OFF
ON
ON
ON
ON

OFF
OFF
OFF
OFF
OFF
OFF
OFF
OFF
ON
ON
ON
ON
ON
ON
ON
ON

DF129-12

DF129

INSTALLATION

Installing the Modem Module
Since the DF129-AM and DFI29-BM modem modules are packaged individually, the modem module must
be installed into the standalone or multiple modem enclosure before connecting to the network. Refer to the
Desktop Enclosure section in Chapter 5 for installation of the DFI29-AM and DFI29-BM modem modules
into the DFIOO-DT desktop enclosure. Refer to the Rack Mount Enclosure section in Chapter 5 for
installation into the DFlOO-RM multiple modem enclosure.
Refer to Chapter 6 for installation of the DF 129-AM and DF 129-BM modem modules into the DFM
statistical multiplexer.
Installing the Modem
The DF129 modem can be installed to a 4-wire private/leased line. Refer to Chapter 5 for installation of
the modem to private line telephone services.

NOTE
DF129-AM modem modules up to serial number
NQ01700 are designed for use with the DFM statistical multiplexer only, and should not be used in any
other enclosure. Modules above serial number
NQ01700 can be used in any of the available
enclosures.

DF129-13

DF129

TESTING

General
Diagnostic testing of the DF129-AM, -8M modem module exists for the following types of tests:
•

Power-Up Self-Test

•

Local DTE Test

•

Local Analog Loopback Test
Set LL switch on local modem

•

Local Analog Loopback Self-Test
Set LL and TP switches and verify TM indicator

•

Digital Loopback Self-Test
Set DL switch on local modem, TP switch on remote modem, and verify TM indicator on
remote modem

•

Remote Digital Loopback Test
Set RL switch on local modem

•

Remote Digital Loopback Self-Test
Set TP and RL switches on local modem and verify TM indicator on local modem

•

End-To-End Self-Test
Set TP switch on both modems and verify TM indicator on both modems

Refer to Chapter 7 for the test procedures for the DF129-AM and DF129-BM modem modules.

DF129-14

DF129 MAINTENANCE AIDS
DF129 Tech Tips/FCO Index
The table below lists Tech Tips and FCOs for the DF129 modem.
Table DF129-11 DFl29 Tech Tip/FCO Index
Tech Tip/
FCO No.

Title

Speed
Bulletin No.

DFI29-TT-OI

DF129 Modems at Wrong Speed

558

DF129-15

NOTES

DF212 INTRODUCTION

DF212 MODEM
D F212 General Description
The DF212 (1200) modem is a powerful, high-performance, high-speed and versatile modem that uses
standard dial-up telephone service to communicate serial binary data from one place to another.
DF212 Features

•

Supports two command languages: DIGITAL modem command languge (DMCL) and Hayes™
Smart Modem compatible AT command language™.

•

Performs asynchronous speed buffering up to 9600 bls from 1200 b/s only.

•

Error correction is supported for on-line error detection and retransmission using either
MICROCOMTM networking protocol (MNP) or x.PC (TYMNETTM implementation) protocols at
1200 b/s.

•

Access/callback security provides two forms of password security:
Restricts access in changing stored phone numbers and other parameters
Controls the callback feature.

•

Speed changes automatically to match the speed of the other modem (except in 600 b/s).

•

DF212 modem is compatible with the following standard protocols:
Bell 212TM @ 1200 b/s
Bell 1O3™ @ 300 b/s
Y.22 @ 1200 b/s
Y.22 @ 600 b/s.

•

All option parameters can be changed from a terminal keyboard or computer.

•

Advance autodialer
Provides compatibility with tone and pulse dialing techniques
Provides numerous commands to control a variety of functions
Dials telephone numbers in interactive terminal mode or CPU mode
Stores up to 30 telephone numbers (a maximum of 36 characters each)
Provides nonvolatile memory so that telephone numbers are saved when the unit is turned off
Allows stored telephone numbers to be identified by Mn memory designations (MI-M30) or
optional 6-character names
Links a group of stored telephone numbers in sequence so that the next number is dialed if
the current telephone number is busy or if there is no answer.

DF212-1

DF212 INTRODUCTION

The DF212 modem consists of:
•
•
•
•
•

Unit (PN 29-26379-00)
Wall-mounted power supply (PN 29-26240)
Telephone extension cord (RJllC)
DF212 1200 Modem User's Guide (EK-DF212-UG)
SCHOLAR Plus Reference. Card (EK-DF242-RC).

D F212 Specifications
Specifications for the DF212 modem are shown in Table DF212-1.
Table DF212-1

Specifications

Item

Specification

Data Rate

300 b/s asynchronous format
1200/600 b/s asynchronous/synchronous formats

Modulation

Frequency shift keying (FSK) at 300 b/s
Differential phase shift keying (DPSK) at 1200/600 b/s

Format

Asynchronous 5, 6, 7, or 8 data bits for 300, 600, or 1200 b/s
Bit synchronous for 1200/600 b/s

Mode

Public switched telephone network (PSTN) only

Interface

EIA RS-232-D, RS-422, and RS-423 compatible voltages

Interface Cables

BC22E, BC22F, or equivalent for asynchronous operation
BC22F or equivalent for synchronous operation

Operating Temperature

lOOC to 40°C (50°F to 104°F) free air (normal convection)

Storage Temperature
Relative Humidity

10% to 90% noncondensing and noncaustic

Diagnostics

Power-up self-test
Local analog loopback test
Remote digitalloopback test

Dimensions

Height: 30.3 mm (1.19 inch)
Width: 152.4 mm (6.00 inch)
Length: 219.0 mm (8.62 inch)

Weight

0.9 kg (2 lb) including power supply

DF212-2

DF212 INTRODUCTION

Table D F212-1

Specifications (Cont)

Item

Specification

Power Supply

AC input: 120 Vac @ 60 Hz (normal)
Power: Operates between 104 and 128 Vrms at 57 to 63 Hz with a
maximum input current of 120 rnA at 128 Vac. The input power is
19.2 VA

DC Output

+5 Vdc @ 0.8 A maximum
+12 Vdc @ 0.1 A maximum
-12 Vdc @ 0.1 A maximum

Dial Memory Capacity

Up to 30 telephone numbers, each consisting of a maximum of 36
characters

Callback Memory Capacity

Up to 30 telephone numbers can be logged into callback memory
and authorizing callback

Error Correction

MICROCOM™ networking protocol (MNP) or TYMNET™
(X. PC)

Speed Buffering

Asynchronous speed buffering up to 9600 b/s with optional
XON/OFF or RTS/CTS flow control

DF212 Reference Documentation
Refer to the following documents for more information:

•
•

DF212 1200 Modem User's Guide
SCHOLAR Plus Reference Card

DF212-3

EK-DF212-UG
EK-DF242-RC

DF212 INTRODUCTION

Unpacking and Inspecting the DF212 Modem
The DF212 modem (PN 29-26379-00) is packaged in a cardboard container with the following items:

•
•
•
•

Wall-mounted power supply (PN 29-26240)
Telephone extension cord (RJ 11 C)
DF212 1200 Modem User's Guide (EK-DF212-UG)
SCHOLAR Plus Reference Card (EK-DF242-RC).

Verify the contents with Figure DF212-I and check each piece for damage.

MKV87-1631

DF212-1

Package Contents

Installing the DF212 Modem
Procedures for installing the modem to the public switched telephone network vary, depending on the type of
service that is requested and installed by the telephone company. The two types of service are:

•
•

Connecting to telephone service
Connecting to exclusion key/programmed service.

DF212-4

DF212 INSTALLATION
Connecting to Telephone Service
The RJIIC (U.S.) or CAllA (Canada) are the most common types of service. The installation
procedures are:
1.

Unplug the telephone from the wall-mounted modular telephone jack. See Figure DF212-2.

WARNING
Hazardous voltages may be present on telephone lines.
DO NOT leave any telephone cords disconnected, and
DO NOT TOUCH any bare telephone connection.

lOCKIN~

...

SQUEEZE LOCKING TAB
AND PULL FROM JACK

MKV85-0359

DF212-2

Installing Telephone Service (Sheet I of 7)

DF212-5

DF212 INSTALLATION
2.

Plug the telephone into the modular telephone jack marked TEL SET. Push in until the tab snaps
into the jack.

MKV87·1282

DF212-2

Installing Telephone Service (Sheet 2 of 7)

DF212-6

DF212 INSTALLATION
3.

Plug the telephone extension cord (supplied with the modem) into the other modular telephone
jack marked PHONE LINE. Push in until the tab snaps into the jack.

MKV87-1283

DF212-2

Installing Telephone Service (Sheet 3 of 7)

DF212-7

DF212 INSTALLATION
4.

Plug the other end of the telephone extension cord into the wall-mounted modular telephone jack
(RJIICjCAIIA).

WARNING
Hazardous voltages are present on telephone lines. Do not
leave any telephone cords disconnected. Above all, DO
NOT TOUCH any bare telephone connections.

WHEN INSTALLING MODEM, ALWAYS MAKE THIS CONNECTION LAST. WHEN
REMOVING MODEM, ALWAYS REMOVE THIS CONNECTION FIRST.

BE SURE THAT TELEPHONE CONNECTIONS
ARE NOT FORCED IN THE WRONG WAY.

~PLUG

THEM STRAIGHT IN.

WRONG WAY

~V
,

RIGHT WAY
MKV87-1622

DF212-2

Installing Telephone Service (Sheet 4 of 7)

DF212-8

DF212 INSTALLATION

Plug the data cable from your terminal equipment into the RS-232 connector marked TERMINAL EQUIPMENT. Make sure that the data cable is also connected to your terminal
equipment.

MKV87-1344

DF212-2
6.

Installing Telephone Service (Sheet 5 of 7)

Set the data terminal characteristics at:
Operating mode
Speed
Data bits/character
Stop bits
Parity

Asynchronous
1200 b/s
8 bits
1 stop bit
None

NOTE
The data cable is not supplied with the modem. It is
usually provided by the terminal manufacturer. If you
need to purchase a cable, DIGITAL cable
(PN Be22E) is recommended for asynchronous
operations.

DF212-9

DF212 INSTALLATION

Plug the power supply cord into the connector marked POWER.

MKV87-1285

DF212-2
8.

Installing Telephone Service (Sheet 6 of 7)

Plug the power supply into a 3-prong, grounded, ac wall outlet.

MKV87-1286

DF212-2

Installing Telephone Service (Sheet 7 of 7)
DF212-10

DF212 INSTALLATION

Checking for Ready
This test shows that the terminal communicates with the modem by displaying the Ready prompt.
See Table DF212-2.
Table DF212-2

Checking for Ready

Steps

Indications

Remedies

Press CTRL/B
on the terminal

The Ready prompt
displays on terminal

Go to next step

No display of Ready
on terminal

Press CTRL/B again

Recheck terminal
characteristics

Type AT. If OK displays,
the modem is in AT mode

Call Atlanta Hotline:
1-800-241-2546 or
DTN 435-4654

Enter command
string: LIST P

Terminal displays
modem parameters and
concludes with a Ready
prompt

Test completed

Terminal displays no
parameters

Input command
string again

Call Atlanta Hotline:
1-800-241-2546 or
DTN 435-4654

DF212-11

DF212 INSTALLATION
Connecting to Exclusion Key/Programmed Telephone Service
When you install the DF212 to exclusion key/programmed telephone service, no connection is required to
the modular telephone jack (marked TEL SET). Open the modem enclosure and change two of the modem's
options (PR/PC and MljMIC), then use an 8-wire telephone extension cord (not supplied). Follow the
procedure below:
1.

Open the DF212 modem enclosure to enable options.
a.

PR/PC must be set to select programmed. Removed the jumper from El to E2 and connect
it between E2 and E3.

MI is enabled by removing the jumper from E6 to ES and connecting it between E4 and ES.

MIC is enabled by removing the jumper from E8 to E9 and connecting it between
E7 and E8.

Close the modem box.

Connect one end of the telephone extension cord (8-wire) to the wall-mounted, modular
telephone jack.

Connect the other end of the extension cord to the modular telephone jack marked PHONE
LINE on the back of the modem. Be sure to push the modular connector in until the tab snaps
into the jack.
NOTE
No connection to the modular telephone jack (marked
TEL SET on the modem) is required.

Connect the data cable from your terminal equipment into the RS-232 interface connector
marked TERMINAL EQUIPMENT on the back of the modem.
NOTE
The data cable is not supplied with the modem. It is
usually provided by the terminal manufacturer. If you
need to purchase a cable, DIGITAL cable
(PN BC22E) is recommended for asynchronous
operations.

Connect the power supply cord into the connector marked POWER. Plug the power supply into a
110 to 120 V grounded, ac wall outlet. See Figure DF212-3.

DF212-12

DF212 INSTALLATION

TELEPHONE
EXTENSION
CABLE

RJ36CI
RJ41 SI
RJ45S
SERVICE

EXCLUSION

KEY
TELEPHONE

MKV87·1293

DF212-3

Installing Exclusion Key/Programmed Service

DF212-13

DF212 INSTALLATION

Option Settings
All configuration parameters are software-selected. Some parameters may be overridden by using
switch packs and jumpers.
Hardware-Select Options
The DF212 modem has one external switchpack (SWPKl), one internal switchpack (SWPK2), and several
internal jumpers that can be used to select a variety of modem options. These options are referred to as
hardware-select.
The modem module can contain anyone of three types of switchpacks (see Figure DF212-4). Some switches
are marked ON and OFF, some are marked OPEN and CLOSED, and others are just marked OPEN.
Tables DF212-3, DF212-4, and DF212-5 use ON/OFF terminology. For switches that are marked
OPEN/CLOSED, OPEN equals ON and CLOSED equals OFF.

RAISED

RECESSED

\
'___ _ _ _ _ _ _ _ _-",

USE POINTED OBJECT.
DO NOT USE LEAD
PENCIL.

SLIDE

IlnnD~nDn D t
II

I_~~.~~_~ __=~~~h

\
MKV85·1222

DF212-4

Types of Switches

Hardware-select options on SWPK2 are used only when the user selects the default option on SWPK 1
(switch 2 must be on). Otherwise, the hardware-select options are ignored. See Figure DF212-5 for
the switch and jumper locations. Tables DF212-3, DF212-4, and DF212-5 list the factory default settings
of the switches.

DF212-14

DF212 INSTALLATION

SWITCHPACK 52

8WITCHPACK 81

12345678

~~~~iii~ii
OPEN

MKV87-1624

DF212-5

Switch and Jumper Location

DF212-15

DF212 INSTALLATION
Table DF212-3

Switchpack 1 (SWPK1)

Option

Selection

SWI

Factory
Defaults

Disabled
Enabled

OFF
ON

User
Defaults

Disabled
Enabled

Remote
Diagnostics

Disabled
Enabled

Callback
Security

Disabled
Enabled

SW2

SW3

SW4

OFF
ON
OFF
ON
OFF
ON

NOTE:
Standard factory configurations are printed in blue.

Table DF212-4

Switchpack 2 for Asynchronous Operation

Option

Selection

SWI

Autodial
Protocol

DMCL Mode
AT Mode

OFF
ON

Communication
Protocol

Asynchronous

Parity Type

Odd
Even

Parity Select

Disable
Enable

Number of
Data Bits

S Bits
6 Bits
7 Bits
8 Bits

Modem
Protocol

Bell 1O3™
Bell 212TM
Y.22600
Y.22 1200

SW2

SW3

SW4

SW5

SW6

ON
ON
OFF
OFF

ON
OFF
ON
OFF

SW7

SW8

ON
ON
OFF
OFF

ON
OFF
ON
OFF

OFF
OFF
ON
OFF
ON

NOTES:
Switches 3 through 8 have different functions, depending on the setting of switch 2 in Table DF212-S.
Standard factory configurations are printed in blue.

DF212-16

DF212 INSTALLATION
Table DF212-5 Switchpack 2 for Synchronous Operation
Option

Selection

SWI

Autodial
Protocol

DMCL Mode
AT Mode

OFF
ON

Communication
Protocol

Synchronous

SW2

SW3

SW4

SW5

SW6

ON
ON
OFF
OFF

ON
OFF
ON
OFF

SW7

SW8

ON
ON
OFF
OFF

ON
OFF
ON
OFF

Reserved

NOT
USED

Reserved

NOT
USED

Terminal
Timing

Not Used
Slave
External
Internal

Modem
Protocol

Not Used
Bell 212TM
Y.22 600
V.22 1200

NOTES:
Switches 3 through 8 have different functions, depending on the setting of switch 2 in Table DF212-4.
Standard factory configurations are printed in blue.

Internal Jumpers
The jumpers are stake pins with push-on shorting plugs. The shorting plugs can connect to a 3-stake
pin configuration. See Figure DF212-5 for the location of the jumpers. Jumper selection is provided in
Table DF212-6.

DF212-17

DF212 INSTALLATION

Table DF212-6

Jumper Selection

Option

Selection

EI-E2

E2-E3

PR/PC

Permissive
Programmed

IN
OUT

OUT
IN

Enabled
Disabled

MIC

Enabled
Disabled

DTR

Normal
Forced

E4-5

E5-E6

OUT
IN

OUT

Option

Selection

E13-E14

E14-15

EIA-RDL
(RL)

Enabled
Disabled

OUT
iN

OUT

EIA-ANL Enabled
(LL)
Disabled
EIA-TM
(TM)

E7-E8

E8-E9

IN
OUT

OUT
IN

E16-E17

E17-E18

OUT
IN

OUT

Enabled
Disabled

EIO-Ell Ell-EI2

IN
OUT

OUT
IN

E19-E20

E20-E21

OUT
IN

OUT

NOTE:
Standard factory configurations are printed in blue.

Software-Select Options
The DMCL command set allows the terminal or computer to select and change parameters. Tables DF212-7
through DF212-12 list parameters (P) according to classes.

DF212-18

DF212 INSTALLATION

Table DF212-7 Operational Class (lOPE) Parameters
Factory
Default

Parameter
No.

Description

Selection

Modem protocol

1200 Bell 212TM = 0
300 Bell 1O3™ = 1
1200 Y.22
=2
600 Y.22
= 3

Character echo

Off
On

=0
= 1

Y.22 (2400)

Answer mode

Automatic
Manual

=0
= 1

Auto

Attached message
on incoming call

Off
On

=0
= 1

Off

Delete key
effect

Hard copy
CRT

=0
= 1

CRT

Enabled remote
digitalloopback

Off
On

=0
= 1

Blind dialing

Off
On

=0
= 1

Off

P12

Speaker enable

Off
On

=0
= 1

On if no CD

P13

Speaker volume

Low
Medium
High

= 1
=2
=3

Medium

P14

Ring to answer
on

1 to 10 rings

2 rings

P15

Callback timer

10 s
20 s
30 s
40 s
50 s
60 s

10 seconds

DF212-19

= 1
=2
=3
=4
=5
=6

DF212 INSTALLATION
Table DF212-8 Communication Class (/COM) Parameters
Parameter
No.

Description

Selection

Data bits

7 bits
8 bits

=3
=4

Factory
Default
8 bits

Parity

None
Even
Odd

= I
=2
=3

None

Stop bits

One
Two

= I
=2

One

Off-line XON/XOFF
recognition

Off
On

=0
= I

Communication
protocol

Asynchronous = 0
Synchronous = I

Asynchronous

Synchronous mode
timing

Internal
External
Slave

=0
= I
=2

Internal

DSR forced

On
Normal

=0
= I

Separate
Common

=0
= I

CDICTS signals

Normal
Separate

Table DF212-9 Disconnect Class (jDIS) Parameters
Parameter
No.

Description

Selection

Send space
disconnect

Off
On

=0
= 1

Receive space
disconnect

Off
On

=0
= 1

Carrier loss
disconnect

Off
On

=0
= 1

Current loss
disconnect

Off
On

=0
= 1

P2
P3
P4

DF2I2-20

Factory
Default

DF212 INSTALLATION

Table DF212-10 Error Class (jERR) Parameters
Factory
Default

Parameter
No.

Description

Selection

Error corrections

Off
MNPon
XPC on

=0
= I
=2

Off

Error correction
auto-fallback

Off
On

=0
= I

Off

MNP reaction to
BREAK from DTE

Disregard
Disregard
Destructive
Nondestructive
immediate
Nondestructive
sequenced

=2
=3
Disregard

MNP reaction to
BREAK from remote
Disregard
Destructive
Nondestructive
immediate
Nondestructive
sequenced

=0
= I

=0
= I
=2
=3
Nondisruptive

MNP disconnect
type
Nondisruptive
Disruptive

DF212-21

=0
= I

DF212 INSTALLATION
Table DF212-11 Speed Buffering Class (jSBU) Parameters
Factory
Default

Parameter
No.

Description

Selection

Speed buffering
state

Off
On

=0
= 1

Off

DTE flow control

None
XON/XOFF

XON/XOFF

Both

=0
= 1
=2
=3

RTS/CTS

Autobaud state

Off
On

=0
= 1

Line speed
with DTE

1200 bls
2400 bls
4800 bls
9600 bls

=0
= 1
=2
=3

1200 bls

Table DF212-12 Access Security Class (jPRO) Parameters
Parameter
No.

Description

Selection

"C" callback
memory access

Off
On

=0
= 1

Off

"M" dial
memory access

Off
On

=0
= 1

Off

"P" parameter
access

Off
On

=0
= 1

Off

DF212-22

Factory
Default

DF212 INSTALLATION
Software-Select SET Command
Software-select parameters are set by using the SET P (set parameter) command followed by a qualifier.
The qualifiers for the different classes are as follows.
•
•
•
•
•
•
•

Operational - lOPE (default)
Communication - ICOM
Disconnect - IDIS
Error correction - IERR
Speed buffering - ISBU
Access security - IPRO
Set all classes - I ALL

Activate DMCL mode

Ready

DMCL ready

SET P2/DIS

Parameter 2 in the Disconnect class is selected

2 RECEIVE SPACE DISCONNECT: OFF=O, ON= 1 <0>: < >

The selected parameter
menu line appears, showing the current value

1 <RETURN>

DMCL changes the current value from a zero to
a one. To use the current
value without changing
the
value,
press
RETURN
Example DF212-1 Setting a Parameter

DF212-23

DF212 INSTALLATION

CTRL/B

Activate DMCL

Ready

DMCL ready

SET P/COM

All parameters in the Communication class are selected

1 DATA BITS: 7 BITS=3
8 BITS=4
[4]:

The first parameter is displayed, showing the current value
(8 bits)

To accept the current value (4), press RETURN

3 <RETURN>

To change the value from 8 bits (4) to 7 bits, enter new
value 3 and press RETURN

2 PARITY: NONE=I, EVEN=2, ODD=3 [I]:
<RETURN>

The next parameter line is displayed
To accept the current value (1), press RETURN or enter a
new value and press RETURN
Continue in this manner for the remaining parameters

CTRL/U

To cancel a value that has been entered before pressing
RETURN, CTRL/U will prompt the value again

CTRL/Z

To accept all remaining values in the class, press CTRL/Z

Ready

Ready prompt is displayed after CTRL/Z is pressed
Example DF212-2 Setting All Parameters in One Class

DF212-24

DF212 INSTALLATION
CTRL/B

DMCL activated

READY

DMCL ready

SET P/ALL

All classes
Operational

will be displayed one by one, starting with

NOTE:
After making changes to any of the following parameters, change the corresponding characteristics of the
serial line connected to the modem.

Example DF212-3 Setting Parameters in All Classes

CTRL/B

DMCL activated

READY

DMCL ready

SET P2:1/DIS

Parameter 2 in the Disconnect class is set to 1 (receive
space disconnect)

READY

The parameter changes and the Ready prompt displays
Example DF212-4 Setting Parameters Without Dialog

DF212-25

DF212 TESTING
General
Diagnostic testing of the DF212 modem consists of the following tests:
•
•
•

Self-test
Local loopback
Remote digital loopback.

Self-Test
When power is applied to the modem, the diagnostic power-up self-test routine is automatically executed.
This test (which takes about five seconds) checks approximately 90% of the modem's electronic circuits. The
test loop (TL) switch has a built-in light emitting diode (LED) to indicate the status of the self-test. The two
conditions for the TL LED are:
•
•

Remains on for five seconds while executing self-test
Blinks if an error has been detected.

To run self-test from DMCL, follow the procedure below:
1.
2.

Press CTRL/B to activate the DMCL
Type ENA TEST at the Ready prompt and RETURN.

If an error has been detected, error code "-1" displays on the terminal.

Local Loopback Test (DMCL Mode)
This test verifies that the DF212 modem can transmit and receive data. See Figure DF212-6.
CAUTION
Make sure that the modem speed is set for 600 or
1200 b/s.
Procedure:
1.

Verify that the terminal ready (TR) LED is on. The speed indicator (SI) is either green or red,
depending on the speed selected.

Press the test loop (TL) switch to the IN position. The data/talk switch can be in either position.

Verify that the TL LED (inside the test loop switch) comes on.

Type a test message on the terminal and verify that the same data is displayed at the terminal.
Incorrect data indicates that:

Some modem options such as data bits, parity, or stop bit selections are set incorrectly

The terminal is set to the wrong speed

The modem is defective.

Set the test loop switch to the OUT position to terminate the test. The LED will go off.

DF212-26

DF212 TESTING

LOOP FOR LOCAL
LOOPBACK TEST

MKV87-1628

DF212-6

Local Analog Loopback Test

DF212-27

DF212 TESTING
Remote Digital Loopback Test
This test verifies that the DF212 modem can transmit or receive data over the telephone line, through the
remote modem, and back over the telephone line. See Figure DF212-7.
CAUTION
Make sure that the modem speed is set for 600 or
1200 b/s.
Procedure:
1.

Verify that the TR LED is on. The SI indicator is either green or red, depending on the speed
selected.

Establish a connection by dialing the remote end. Upon receiving the message ATTACHED, the
modem is connected and on-line.

Press the test loop switch to the IN position.

The LED inside the test loop switch blinks while the modems are attempting to establish remote
digitalloopback (RDL). If RDL is established, the TL LED remains on. If RDL does not come
on, have the remote operator verify that parameter P6 of the operational class parameter group is
set on the remote modem.

Type a test message on the terminal and verify that the same data is displayed at your terminal.
Incorrect data indicates that:

Modem options (data bits, parity, or stop bit) are set incorrectly

Terminal set to wrong speed

Telephone lines may be noisy or faulty

Remote modem may be defective.

Set the test loop switch to the OUT position to terminate the test.

DF212-28

DF212 TESTING

IS ON-LINE AND ATTACHED, TO START
REMOTE DIGITAL LOOPBACK.

TEST LOOP PUSH BUTTON MUST BE
OUT AND MODEM MUST BE SET TO
RESPOND TO REMOTE LOOPBACK
REQUEST (OPERATIONAL
PARAMETER P6
ON).

MKV87-1627

DF212-7

Remote Digital Loopback Test

DF212-29

DF212 MAINTENANCE AIDS
DF212 Tech TipsjFCO Index
The table below lists Tech Tips and FCOs for the DF212 modem.
Table DF212-13 DF212 Tech Tip/FeO Index
Tech Tip/
FeO No.

Title

Speed
Bulletin No.

DF212-CA-TT-Ol

DF212-CA Async DECnet (Hangs)

558

DF212-30

NOTES

DF224 INTRODUCTION
DF224 MODEM
DF224 General Description
The DF224 (Scholar) modem provides full-duplex, asynchronous or synchronous, binary serial data communications over 2-wire, switched telephone network facilities. Low speed operation (300, 600, or 1200 bits/s)
is asynchronous or synchronous; 300/600 bits/s is frequency shift keying (FSK) and 1200 bits/s is
differential phase shift keying (DPSK). High speed operation (2400 bits/s) can be either character asynchronous or bit synchronous, 16-point quadrature amplitude modulation (QAM).
NOTE
Digital will no longer support the synchronous command interface for control of the DF224-AA modem.
The modem may still be used for synchronous data
transmission but only in the Manual/ Autoanswer
and Manual Originate modes. (See Tech Tip
DF224-AA-TT-02.)
The DF224 (SCHOLAR) modem consists of:

•

DF224
Power Supply

•

Modem module and enclosure (PN 29-25042)
Wall-mounted power supply (PN 29-25043)

DF224 registration numbers:
•
•
•
•

FCC: AMQ9SQ-14859-DM-E
Ringer Eq.: 0.9B
DOC: 192 104 2A
LNRS: 26B

DF224 Specifications
Data Rate
Low Speed

300 bits/s asynchronous format or 600/1200 bits/s asynchronous/synchronous format

High Speed

2400 bits/s asynchronous/synchronous format

Modulation
Low Speed

300/600 bits/s frequency shift keying (FSK)
1200 bits/s differential phase shift keying (DPSK)

High Speed

2400 bits/s 16-point quadrature amplitude modulation (QAM)

Format
Low Speed

Asynchronous 8, 9, 10, or 11 bit ASCII characters

High Speed

Character asynchronous or bit synchronous binary stream data

DF224-1

DF224

INTRODUCTION

Telephone Connections

2-wire public switched telephone network (PSTN) RJ 11 C
(CAliA) or RJ4IS/RJ45S (CA41A/CA45A)

Compatibility

Bell 103J @ 300 bits/s, Bell 212A @ 1200 bits/s, Y.22 @ 1200
bits/s and Y.22 bis @ 2400 bits/s with fallback to 1200 bits/s

Interface Compatibility

EIA RS-232-C/RS-423-A compatible voltages. Distances up to
15.24 m (50 ft)

Interface Cables

BC22E, BC22F, (or equivalent) for asynchronous operation
BC22F (or equivalent) for synchronous operation

Operating Temperature
Storage Temperature
Relative Humidity

10% to 90% non condensing

Dimensions
30.3 mm (1.19 in)
152.4 mm (6.00 in)
219.0 mm (8.62 in)

Height
Width
Length

0.680 kg (1.5 lb)

Weight
Power Supply
AC Input

120 Vac, 60 Hz (104 to 128 VRMS at 57 to 63 Hz) with maximum input current of 150 rnA at 128 Vac. Protected by an
externally accessible 0.5 A fuse

DC Output

+5 Vdc @ 0.800 A maximum
+12 Vdc @ 0.100 A maximum
-12 Vdc @ 0.100 A maximum

DF224 Reference Documentation
Refer to the following documents if the level of content in this section is insufficient.

•
•

SCHOLAR Installation Guide EK-DF224-IN
SCHOLAR Owner's Manual EK-DF224-0M

DF224-2

DF224 INSTALLATION
OF224 Modem Options
Options for the DF224 modem are selected by the hardware and software. The DF224 modem module
hardware options are either selected by switchpacks or jumper straps. Two switchpacks and four jumpers
are available for option selection.
Tables DF224-1 through DF224-3 list the jumpers and switch packs for option selection. Each module is
shipped from the factory with preset options. In the tables, factory settings are printed in bl ue. Refer to
Chapter 8 for descriptions of the modem options.
Before hardware selected options can be verified or changed, the enclosure must be opened. To open the
enclosure, remove the four screws on the bottom and separate the two halves of the enclosure.
NOTE
There are changes in the way the OF224-AA modem
(Revisions CI - 01) stores set-up parameters. See
Tech Tip OF224-AA-TI-02.

DF224-3

DF224

INSTALLATION

CX)

IlIIIIICJ

r--1IIlIIlCJ
c.o IIIIIlICJ
l!)

IIIlIIlCJ ~

IIIlIlID g;

(V)

IIlIIIICJ

SWITCHPACK S2*

JUMPER STRAPS*

*FACTORY SELECTIONS ARE SHOWN
MKV86-0802

Figure DF224-1

DF224 (SCHOLAR) Modem Top Cover Removal and Module Layout

DF224-4

DF224 INSTALLATION

Table DF224-1

DF224 Switchpack 1 Selections

Option

Selection

Local
Character
Echo

Enabled
Disabled

ON
OFF

Answer
Mode

Auto
Manual

Modem
Response

Full
Abbreviated

Terminal
Timing

Internal
External
Slave
Not Used

Transmission
Mode
Select

Async
Sync

Configuration
Mode
Select

V.22 bis
Bell 212A
Bell 103J
V.22

ON
OFF
OFF
ON

ON
ON
OFF
OFF

ON
OFF
ON
OFF

ON
ON
OFF
OFF

ON
OFF
ON
OFF

ON
OFF

Table DF224-2

DF224 Switch pack 2 Selections

Option

Selection

Force DTR
ON

Enabled
Disabled

ON
OFF

OFF
ON

MIjMIC
Ground

Enabled
Disabled

Interface
Speed
Select

Enabled
Disabled

Table DF224-3

ON
OFF
ON
OFF

DF224 Jumper Selections

Option

Selection

El to E2

E2 to E3

PR/PC

Permissive
Programmed

OUT
IN

IN
OUT

Disabled
Enabled

DF224-5

E4 to E5

E5 to E6

OUT
IN

IN
OUT

DF224

INSTALLATION

Selecting DF224 Modem Options by Using the Software
Software option selection is achieved from the DF224 modern's set-up feature of the autodialer.
To set options with the DF224 software, evoke the autodialer with CTRL B. At the READY prompt type
% and a <RETURN> and then enter selections as they appear on the option menu.

CTRL B

Enter Control B. This activates the
autodialer.

READY

Indicates
ready.

% <RET>

Enter the percent sign (%) followed
by a carriage retur~ <RET> to activate the menu selection process. The
number in the bracket is the default
selection. The menu appears as
follows:

AUTO CALL DF03=0 DF224=1 [1]

Enter your selection followed by a
<RET>. If the current selection is
satisfactory, just enter <RET>. After
the selection is made the cursor
advances to the next line.

CHAR ECHO OFF=O ON=1 [1]
ANSWER AUTO=O MAN=1 [0]
MODE BELL 212=0 BELL103=1
V22 BIS=2 V22A=3

that

the

[2]

MODE ASYNC=O SYNC=1 [0]
TIMING INT=O EXT=1 SLAVE=2 [0]
CHAR LENGTH

8BITS=1
9BITS=2
10BITS=3 11BITS=4

[3]

PARITY NONE=1 EVEN=2 ODD=3 [1]
STOP BITS ONE=1 TWO=2 [1]
ENAB REM DIG LOOPBACK OFF=O ON=1 [1]
SEND SPACE DISCONNECT OFF=O ON=1 [0]
REC SPACE DISCONNECT OFF=O ON=1 [0]
CARRIER LOSS DISCONNECT OFF=O ON=1 [1]
CURRENT LOSS DISCONNECT OFF=O ON=1 [1]
MODEM RESPONSE ABBREVIATED=O FULL=1 [1]
DSR FORCED=O NORMAL=1 [1]
Figure DF224-2

DF224 Software Option Selection

DF224-6

autodialer

DF224

INSTALLATION

Installing the Modem
The DF224 (SCHOLAR) modem can be installed to either RJ11C (CAllA) service or RJ41S/RJ45S
(CA41A/CA45A) exclusion key service.

MKV85·1407

Figure DF224-3

Installing the DF224 (SCHOLAR) Modem on RJ 11 C (CA 11 A) Service

DF224-7

DF224

INSTALLATION

DTE

TELEPHONE
EXTENSION
CABLE

RJ41S
OR RJ458
SERVICE

EXCLUSION

KEY
TELEPHONE

MKV85-1408

Figure DF224-4

Installing the DF224 (SCHOLAR) Modem on RJ41SjRJ45S
(CA41 A/CA45A) Service

DF224-8

DF224
General
Diagnostic testing of the DF224 modem exists for the following types of tests:
•

Power-Up Self-Test

•

Local Analog Loopback Test
Set the LOCAL LOOP switch

•

Remote Digital Loopback Test
Set the LOCAL LOOP switch

Refer to Chapter 7 for the test procedures for the DF224 modem.

DF224-9

TESTING

DF224 MAINTENANCE AIDS
DF224 Tech Tips/FCO Index
The following table lists Tech Tips and Feos for the DF224 modem.

Table DF224-4

DF224 Tech Tip/FCO Index

Tech Tip/
FCO No.

Speed
BuJJetin No.

Title

DF224-R-BI-OOI

Garbage Data, Blind Dialing,
and 300 f.LS Ring Fixes

403

DF224-AA-TT-OI

DF224 Does Not Recognize Special
Rings

452/449

DF224-TT-01

DF224 Connection to System

427

DF224-TT-02

DF224 Autodialing

429

DF224-AA-TT-02

DF224 Synchronous Mode

560

DF224-10

NOTES

DF242 INTRODUCTION

DF242 MODEM
DF242-CA General Description
The DF242-CA (Scholar Plus) modem is a powerful, high-performance, high-speed and versatile modem
that uses standard dial-up telephone service to communicate serial binary data from one place to another.
DF242 Features
•

Supports two command languages: Digital modem command languge (DMCL) and an expanded
version of the Hayes Smartmodem ™ 2400 AT command language.

•

Performs asynchronous speed buffering up to 9600 bits/s from 1200/2400 bits/s only.

•

Error correction is supported for on-line error detection and retransmission using either
MICROCOM™ networking protocol (MNP) or x.PC (TYMNET™ implementation) protocols at
1200/2400 bits/so

•

Access/callback security provides two forms of password security (DMCL only):
-

Restricts access in changing stored phone numbers and other parameters

- Controls the callback feature.
•

Speed changes automaticalIy to match the speed of the other modem.

•

DF242 modem is compatible with the following standard protocols:
- Bell 212TM @ 1200 bits/s
- Bell 103™ @ 300 bits/s
- Y.22 bis @ 2400 bits;;;
- Y.22 @ 1200 bits/s

•

All option parameters can be changed from a terminal keyboard or computer.

•

Advance autodialer
-

Provides compatibility with tone and pulse dialing techniques

Provides numerous commands to control a variety of functions

Dials telephone numbers in interactive terminal mode or CPU mode

- Stores up to 30 telephone numbers (a maximum of 36 characters each)
-

Provides nonvolatile memory so that telephone numbers are saved when the unit is turned off

Allows stored telephone numbers to be identified by Mn memory designations (MI-M30) or
optional 6-character names

Links a group of stored telephone numbers in sequence so that the next number is dialed if the
current telephone number is busy or if there is no answer.
NOTE
Modems with serial numbers RN9200 or greater
contain Revision 1.5 firmware.
DF242-1

DF242 INTRODUCTION

The DF242-CA modem consists of:
•
•
•
•

Scholar Plus modem (PN 29-26380-00)
External power supply (PN 29-26240)
Telephone extension cord (RJIIC or CAllA)
Documentation

DF242 Specifications
Specifications for the DF242-CA modem are shown in Table DF242-1.

Table DF242-1 Specifications

Item

Specification

Data Rate

300 bits/s asynchronous format
1200 bits/s asynchronous/synchronous formats
2400 bits/s asynchronous/synchronous formats

Modulation

Frequency shift keying (FSK) at 300 bits/s
Differential phase shift keying (DPSK) at 1200 bits/s
Quadrature amplitude modulation (QAM) at 2400 bits/s

Format

Asynchronous 5, 6, 7, or 8 data bits at 100/1200/2400 bits/s
Character asynchronous or bit synchronous at 1200/2400 bits/s

Telephone Service

Public switched telephone network (PSTN) only

Interface

EIA RS-232-D, RS-422, and RS-423 compatible voltages

Interface Cables

BC22E, BC 22 F, or equivalent for asynchronous- operation
BC22F or equivalent for synchronous operation

Operating Temperature

10° to 40°C (50° to 104°F)
Free air (normal convection)

Storage Temperature
Relative Humidity

10% to 90% noncondensing and noncaustic

Diagnostics

Power-up self-test
Local analog loopback test
Remote digital loopback test

Dimensions

Height: 30.3 mm (1.19 inch)
Width: 152.4 mm (6.00 inch)
Length: 219.0 mm (8.62 inch)

DF242-2

DF242 INTRODUCTION
Table DF242-1 Specifications (Cont)
Item

Specification

Weight

0.9 kg (2 lb) including power supply

Power Supply

AC input: 120 Vac @ 60 Hz (normal)
Power: Operates between 104 and 128 Vrms at 57 to 63 Hz with
a maximum input current of 120 rnA at 128 Vac. The input
power is 19.2 VA

DC Output

+5 Vdc @ 0.8 A maximum
+12 Vdc @ 0.1 A maximum
-12 Vdc @ 0.1 A maximum

Dial Memory Capacity

Up to 30 telephone numbers, each consisting of a maximum of 36
characters

Callback Memory Capacity

Up to 30 telephone numbers can be logged into callback memory
and authorizing callback

Error Correction

MICROCOMTM networking protocol (MNP) or TYMNET™

(XPC)
Speed Buffering

Asynchronous speed buffering at 1200/2400/4800 or 9600
bits/s with optional XON/OFF or RTS/CTS flow control

DF242 Reference Documentaion
Refer to the following documents for more information:
Before firmware Revision 1.5:
•
•
•

DF242 SCHOLAR Plus 2400 Modem User's Guide
SCHOLAR Plus Reference Card
DF212 and DF242: Getting Started

EK-DF242-UG
EK-DF242-RC
EK-DF242-GS

For firmware Revision 1.5:
•
•
•

DF212/DF242 Modem (DMCL) User's Guide
DF212/DF242 Modem (AT) User's Guide
DF212/DF242 Modem Reference Manual

DF242-3

EK-DF2XD-UG
EK-DF2XA-UG
EK-DF2XX-RM

DF242 INSTALLATION
Unpacking and Inspecting the DF242-CA Modem
The DF242-CA modem is packaged in a cardboard container with the following items:
•
•
•
•

Power supply
Telephone cord
Accessories
Documentation

Verify the contents with Figure DF242-l (before firmware Revision 1.5) or Figure DF242-2, and check
each piece for damage.

GETTING STARTED

USER'S GUIDE

MKV87·1641

Figure DF242-l

Package Contents (Before Revision 1.5)

Installing the DF242 Modem
Procedures for installing the modem to the public switched telephone network vary, depending on the type of
service that is requested and installed by the telephone company. The two types of service are:
•

Connection to RJllC (U.S.) or CAllA (Canada)

•

Connection to RJ36X/RJ4lS/RJ45S (U.S.) or CA36A/CA4lA/CA45A (Canada) exclusion
key/programmed

After the modem is connected to the telephone service, terminal baud rate must be set to match the modem
(for modems with firmware before Revision 1.5, the default is 2400 bits/ s). For Revision 1.5 firmware, the
default is speed butTering at 9600 bits/ s enabled.
DF242-4

DF242 INSTALLATION
Unpacking and Inspection
The modem is packaged in a single cardboard container along with the power supply, telephone cord, and
accessories. Check the contents with Figure DF242-2. Also, check each piece for damage.

TELEPHONE
EXTENSION CORD
MKV89-0445

Figure DF242-2

Contents of Shipping Container

_DF242-5,

DF242 INSTALLATION

Connecting to Telephone Service
Use the following procedure to connect the modem to RJIIC (U.S.) or CAllA (Canada) telephone service.

Unplug the telephone from the wall-mounted modular telephone jack. See Figure DF242-3.
WARNING
Hazardous voltages may be present on telephone lines.
DO NOT lea"e any telephone cords disconnected, and
DO NOT TOUCH any bare telephone connection.

LOCKI~
SQUEEZE LOCKING TAB
AND PULL FROM JACK

MKV85-0359

Figure DF242-3

Installing Standalone Modem (Sheet 1 of 4)

DF242-6

DF242 INSTALLATION
2.

Plug the telephone into the modular telephone jack marked TEL SET. Push in until the tab snaps
into the jack.

MKV87·1282

Figure DF242-3

Installing Standalone Modem (Sheet 2 of 4)

DF242-7

DF242 INSTALLATION

Plug the telephone extension cord (supplied with modem) into the other modular telephone jack
marked PHONE LINE. Push in until the tab snaps into the jack.

MKV87-1283

Figure DF242-3

Installing Standalone Modem (Sheet 3 of 4)

DF242-8

DF242 INSTALLATION

Plug the other end of the telephone extension cord into the wall-mounted modular telephone jack
(RJIIC/CAIIA).
WARNING
Hazardous voltages can be present on telephone lines. Do
not leave any telephone cords disconnected. Above all.
DO NOT TOUCH any bare telephone connections.

WHEN INSTALLING MODEM. ALWAYS MAKE THIS CONNECTION LAST. WHEN
REMOVING MODEM. ALWAYS DISCONNECT THIS CONNECTION FIRST.

BE SURE THAT TELEPHONE CONNECTI ONS
ARE NOT FORCED IN THE WRONG WAY.

11~ijf(rpLUG

THEM STRAIGHT IN.

WRONG WAY

RIGHT WAY
MKV87-1284

Figure DF242-3

Installing Standalone Modem (Sheet 4 of 4)

DF242-9

DF242 INSTALLATION
5.

Plug the data cable from your terminal equipment into the RS-232 connector marked TERMINAL EQUIPMENT. Make sure that the data cable is also connected to your terminal equipment. See Figure DF242-4.

MKV87-1344

Figure DF242-4

Terminal Equipment

NOTE
The data cable is not supplied with the modem; it is
usually provided by the terminal manufacturer. If you
need to purchase a cable, Digital cable (PN Be22E)
is recommended for asynchronous operations.
6.

Set the data terminal characteristics at:
Operating mode
Speed
Data bits/character
Stop bits
Parity

Asynchronous
2400 bits/s
8 bits
1 stop bit
None

DF242-10

DF242 INSTALLATION

WARNING
Use only indoors. Do not use the power supply with

an extension cord.
CAUTION
Use only the power supply provided.
7.

Plug the power supply cord into the connector marked POWER. See Figure DF242-S.

MKV87-'285

Figure DF242-S

Power Cable

DF242-11

DF242 INSTALLATION

Plug the power supply into a 3-prong, grounded, 110 Vac to 120 Vac wall outlet. See Figure
DF242-6.

MKV87-1286

Figure DF242-6

Power Outlet

DF242-12

DF242 INSTALLATION

Checking for Ready
This test shows that the terminal communicates with the modem by displaying the Ready prompt. See Table
DF242-2.

Table DF242-2 Checking for Ready
Steps

Indications

Remedies

Press CTR L/B
on the terminal

The Ready prompt
displays on terminal

Go to next step

No display of Ready
on terminal

Press CTRL/B again

Recheck terminal
characteristics

Type AT. If OK displays,
the modem is in AT mode

Call Atlanta Hotline:
1-800-241-2546 or
DTN 435-4654

Enter command
string: LIST P

Terminal displays
modem parameters and
concludes with a Ready
prompt

Test completed

Terminal displays no
parameters

Input command
string again

If terminal displays
error, return to step 1

Call Atlanta Hotline:
1-800-241-2546 or
DTN 435-4654

DF242-13

DF242 INSTALLATION

Connecting to Exclusion Key/Programmed Telephone Service (RJ41/CA41A or RJ45S/CA45A)
When you install the DF242-CA to exclusion key/programmed telephone service, no connection is required
to the modular telephone jack (marked TEL SET). Open the modem enclosure and change two of the
modem's options CPR/PC and MI/MIC), then use an 8-wire telephone extension cord (not supplied). Follow
the procedure below:
1.

Open the DF242 (Scholar Plus) modem enclosure to enable options.
a. PR/PC (RJ4SS or CA4SA only) must be set to select programmed. Remove the jumper from
E2 and E3, and connect it between E3 and E 1.
b. MI is enabled by removing the jumper from E6 to ES, and connecting it between E4 and ES.
c. MIC is enabled by removing the jumper from E8 to E9, and connecting it between E7 and E8.
d. Close the modem box.

Connect one end of the telephone extension cord (8-wire) to the wall-mounted, modular telephone
jack.

Connect the data cable from your terminal equipment into the RS-232 interface connector
marked TERMINAL EQUIPMENT on the back of the modem.
NOTE
The Data cable is not supplied with the modem. It is
usually provided by the terminal manufacturer. If you
need to purchase a cable, Digital cable (PN BC22E)
is recommended for asynchronous operations.

Connect the power supply cord into the connector marked POWER. Plug the power supply into a
110 to 120 V grounded, ac wall outlet. See Figure DF242-7.
WARNING
Use only indoors. Do not use an extension cord with
the power supply.
CAUTION
Use only the power supply provided.

DF242-14

DF242 INSTALLATION

TE LEPHONE
EXTENSION
CABLE

RJ36CI
RJ41 SI
RJ45S
SERVICE

EXCLUSION

KEY
TELEPHONE

MKV87-1293

Figure DF242-7

Exclusion Key JProgrammed Service

DF242-15

DF242 INSTALLATION
Options Settings
All configuration parameters are software-selected. Some parameters may be overridden by using
switchpacks and jumpers.
Hardware-Select Options
The Scholar Plus modem has one external switch pack (SWPK 1), one internal switch pack (SWPK5), and
several internal jumpers that can be used to select a variety of modem options. These options are referred to
as hardware-select.
The modem module can contain anyone of three types of switchpacks (Figure DF242-8). Some switches are
marked ON and OFF, some are marked OPEN and CLOSED, and others are just marked OPEN. Tables
DF242-3, DF242-4, and DF242-5 use ON/OFF terminology. For switches that are marked
OPEN/CLOSED, OPEN equals ON and CLOSED equals OFF.

RAISED

RECESSED

BBaBg8B~~{
OPEN
=-~

~ ---~

•

--~

' - -_ _ _ _ _ _ _ _ _....:J'

USE POINTED OBJECT.
DO NOT USE LEAD
PENCIL.

SLIDE

MKV85·1222

Figure DF242-8

Types of Switches

Hardware-select options on SWPK5 are used only when the user selects the default option on SWPK 1
(switch 2 must be on). Otherwise, the hardware-select options are ignored. See Figure DF242-9 for the
switch and jumper locations. Tables DF242-3, DF242-4, and DF242-5 list the factory default settings of the
switches.

DF242-16

DF242 INSTALLATION

SWITCHPACK S5

SWITCHPACK Sl
1

456

~~~~~i~~

~~~~
OPEN

OPEN

MKV87-1064

Figure DF242-9

Switch and Jumper Location

DF242-17

DF242 INSTALLATION

Table DF242-3 Switchpack 1 (SWPKl)
Option

Selection

SWI

Factory
Defaults

Disabled
Enabled

OFF

User
Defaults

Disabled
Enabled

Remote
Diagnostics

Disabled
Enabled

Callback
Security

Disabled
Enabled

SW2

SW3

SW4

OFF
ON

NOTE:
Standard factory configurations are printed in blue.

Table DF242-4 Switchpack 5 for Asynchronous Operation
Option

Selection

SWI

Autodial
Protocol

DMCL Mode
AT Mode

OFF
ON

Communication
Protocol

Asynchronous

Parity Type

Odd
Even

Parity Select

Number of
Data Bits

Modem
Protocol

SW2

SW3

SW4

SW5

SW6

ON
ON

SW7SW8

OFF
OFF
ON

OFF

Disable
Enable

S Bits
6 Bits
7 Bits
8 Bits

OFF
OFF

Bell 103™
Bell 212TM
Y.22
V.22 bis

OFF
ON

ON OFF
OFF ON
OFF OFF

NOTES: Switches 3 through 8 have different functions, depending on the setting of switch S in
Table DF242-S.
Standard factory configurations are printed in blue.

DF242-18

DF242 INSTALLATION
Table DF242-5 Switchpack 5 for Synchronous Operation
Option

Selection

SWI

Autodial
Protocol

DMCL Mode
AT Mode

OFF
ON

Communication
Protocol

Synchronous

SW2

SW3

SW4

SW5

SW6

ON
ON
OFF
OFF

ON
OFF
ON
OFF

SW7SW8

Reserved

NOT
USED

Reserved

NOT
USED

Terminal
Timing

Not Used
Slave
External
Internal

Modem
Protocol

Not Used
Bell 212TM
Y.22

ON ON
ON OFF
OFF ON
OFF OFF

Y.22 his

NOTES: Switches 3 through 8 have different functions, depending on the setting of switch 2 in
Table DF242-4.
Standard factory configurations are printed in blue.

Internal Jumpers
The jumpers are stake pins with push-on shorting plugs. The shorting plugs can connect to a 3-stake
pin configuration. See Figure DF242-9 for the location of the jumpers. Jumper selection is provided in
Table DF242-6.

DF242-19

DF242 INSTALLATION

Table DF242-6 Jumper Selection
Option

Selection

E3-E2 EI-E3 E4-5

PR/PC

Permissive
Programmed

IN
OUT

Enabled
Disabled

MIC

Enabled
Disabled

DTR

Normal
Forced

E5-E6 E7-E8 E8-E9 EI0-Ell EI0-EI2

OUT
IN
IN
OUT

Option

Selection

E13-EI4

E14-15

EIA-RDL
(RL)

Enabled
Disabled

IN
OUT

OUT
IN

EIA-ANL
(LL)

Enabled
Disabled

EIA-TM
(TM)

Enabled
Disabled

OUT
IN

E16-E17

E17-E18

IN
OUT

OUT
IN

NOTE:
Standard factory configurations are printed in blue.

DF242-20

IN
OUT

OUT

E19-E20

E20-E21

IN
OUT

OUT
IN

DF242 INSTALLATION

Software-Select Options
The DMCL command set allows the terminal or computer to select and change parameters. Tables DF242-7
through DF242-12 list parameters (P) according to classes.
Table DF242-7 Operational Class (lOPE) Parameters
Parameter
No.

Description

Selection

Modem protocol

1200 Bell 212TM
300 Bell 103™
2400 Y.22 bis
1200 Y.22

=0
= 1
=2
=3

Factory Default Factory Default
(Before Rev 1.5)
(Rev 1.5)

Character echo

Off
On

=0
= 1

Answer mode

Auto
Man

=0
= 1

Attached msg
on incoming call

Off
On

=0
= 1

Delete key
effect

CRT
Hardcopy

=0
= 1

Enabled rem
Digital Loopback

Off
On

=0
= 1

Blind Dialing

Off
On

=0
= 1

PI 1

Automatic
Retrain

Off
On

=0
= 1

PI2

Speaker enable

Off
On
On (if no CD)

=0
= 1

PI3

Speaker volume

Low
Medium
High

= 1
=2
=3

2
2

P14

Ring to answer
on

Ring

=ltolO

PI5

Callback timer*

Time

= 1-6

* I = 10 seconds, 2 = 20 seconds, 3 = 30 seconds, and so forth.

DF242-21

DF242 INSTALLATION

Table DF242-8 Communication Class (fCOM) Parameters
Parameter
No.

Description

Selection

Factory Default Factory Default
(Rev 1.5)
(Before Rev 1.5)

Data bits

7 bits
8 bits

=3
=4

Parity

None
Even
Odd

= 1
=2
=3

Stop bits

One
Two

= 1
=2

Off-line XONjXOFF Off
recognition
On

=0
=1

Communication
protocol

Asyn
Sync

=0
=1

Sync mode
timing

Int
Ext
Slave

=0
=1
=2

DSR forced

On
Normal

= 1
=2

Separate
Common

=0
=1

EIA CDjCTS
signals

DF242-22

DF242 INSTALLATION

DF242-9 Disconnect Class (lDIS) Parameters
Parameter
No.

Description

Selection

Send Space
Disconnect

Off
On

=0
=1

Recei ve Space
Disconnect

Off
On

=0
=1

Carrier Loss
Disconnect

Off
On

=0
=1

Current Loss
Disconnect

Off
On

=0
= 1

Factory Default Factory Default
(Before Rev 1.5)
(Rev 1.5)

Table DF242-10 Speed Buffering Class (lSBU) Parameters
Parameter
No.

Description

Selection

Speed Buffering
State

Off
On

=0
= 1

DTE Flow Control

None
XON/XOFF
RTS/CTS
Both

=0
=1
=2
=3

Autobaud State

Off
On

=0
= 1

Local Baud
Rate

1200 bits/s
2400 bits/s
4800 bits/s
9600 bits/s

=0
= 1
=2
=3

Factory Default Factory Default
(Rev 1.5)
(Before Rev 1.5)

DF242-23

DF242 INSTALLATION
Table DF242-11 Error Class (jERR) Parameters
Parameter
No.

Description

Selection

Factory Default Factory Default
(Before Rev 1.5)
(Rev 1.5)

Error Correction

Off
MNPon
x.PC on

=0
= 1
=2

Error Correction
Auto-Fallback

Off
On

=0
= 1

Transmit Break
Reaction

Disregard
Destructive
Non-destructive
Immediate
Non-destructive
Sequenced
P4

=0
= 1
=2
=3

Receive Break
Reaction

MNP Disconnect
Type

Disregard
Destructive
Non-destructive
Immediate
Non-destructive
Sequenced

=0
= 1

Non-disruptive
Disruptive

=0
= 1

=2
=3

Table DF242-12 Access Security Class (jPRO) Parameters
Parameter
No.

Description

Selection

Factory Default Factory Default
(Rev 1.5)
(Before Rev 1.5)

Callback
Memory Access

Off
On

=0
= 1

Dial
Memory Access

Off
On

=0
= 1

Parameter
Access

Off
On

=0
= 1

DF242-24

DF242 INSTALLATION

Software-Select Procedures
Software-select parameters are set by using the SET P (set parameter) command followed by a qualifier.
The qualifiers for the different classes are as follows.
•
•
•
•
•
•
•

Operational - lOPE (default)
Communication - ICOM
Disconnect - lOIS
Error correction - IERR
Speed buffering - ISBU
Access security - /PRO
Set all classes - / ALL

The parameters can be set by using one of two formats: dialog or expert. The dialog format prompts the user
for input information, and the expert format relies on the user to input information directly.
NOTE
After the parameters have been changed, the WRITE
command should be used to store the changed parameters. When the DF242 is powered up, it will use the
stored parameters as default settings.

CTRL/B

Activate DMCL mode

Ready

DMCL ready

SET P2/DIS

Parameter 2 in the Disconnect class is selected

2 Receive Space Disconnect: OFF=O, ON=l [0]:

The selected parameter
menu line appears, showing the current value

1 <RETURN>

DMCL changes the current value from a zero to
a one. To use the current
value without changing
the
value,
press
RETURN
Example DF242-1 Setting a Parameter

DF242-25

DF242 INSTALLATION

CTRLjB

Activate DMCL

Ready

DMCL ready

SET PjCOM

All parameters in the Communication class
are selected

1 Data Bits: 7 Bits=3
8 Bits=4

[4]:

The first parameter displays, showing the current value (8 bits)

To accept the current value (4), press
RETURN

3 <RETURN>

To change the value from 8 bits (4) to 7 bits,
enter new value 3 and press RETURN

2 Parity: None=l, Even=2, Odd=3 [I]:

The next parameter line is displayed

To accept the current value (I), press
RETURN or enter a new value and press
RETURN
Continue in this manner for the remaining
parameters

CTRLjU

To cancel a value that has been entered before
pressing RETURN, CTRLjU will prompt
the value again

CTRLjZ

To accept all remaining values in the class,
press CTRLjZ

Ready

Ready prompt displays after CTRLjZ is
pressed
Example DF242-2 Setting All Parameters in One Class

DF242-26

DF242 INSTALLATION

CTRL/B

DMCL activated

Ready

DMCL ready

SET P/ALL

All classes display one by one, starting with
Operational
Example DF242-3 Setting Parameters in All Classes

NOTE
After making changes to any of the following parameters, change the corresponding characteristics of the
serial line connected to the modem.
CTRL/B

DMCL activated

Ready

DMCL ready

SET P2:1/DIS

Parameter 2 in the Disconnect class is set to 1
(receive space disconnect)

Ready

The parameter changes and the Ready
prompt displays
Example DF242-4 Setting Parameters Without Dialog

DF242-27

DF242 TESTING

General
Diagnostic testing of the DF242 modem consists of the following tests in DMCL mode. For AT mode, see
the "Command Summary" section.
•
•
•
•

Self-test
Local analog loopback test
Remote digital loopback test
Remote diagnostics test

Self-Test
When power is applied to the modem, the built-in diagnostic self-test routine automatically executes. This
test (which takes about five seconds) checks approximately 90% of the modem's electronic circuits. This test
can also be executed by the enable test commands at the Ready prompt (DMCL mode). The test loop (TL)
switch has a built-in light emitting diode (LED) to indicate the status of the self-test. The two conditions for
the TL LED are:
•
•

Remains on for five seconds while executing self-test
Blinks if an error has been detected.

To run self-test from DMCL, follow the procedure below:
1.
2.

Press CTRL/B to activate the DMCL.
Type ENA TEST at the Ready prompt and RETURN.

If an error has been detected, error code "-1" displays on the terminal.
Local Analog Loopback Test (DMCL Mode)
This test verifies that the DF242 modem can transmit and receive data. See Figure DF242-10.
CAUTION
The local loopback test operates at 1200 or 2400
bits/ s only. The terminal speed setting must be set to
match the modem speed because speed buffering is
not functional when loopback is activated.
NOTE
The Test Loop switch on the front panel has no
effect while the modem is in AT mode.

DF242-28

DF242 TESTING

LOOP FOR LOCAL
LOOPBACK TEST

MKV87-1628

Figure DF242-10

Local Analog Loopback Test

DF242-29

DF242 TESTING
Procedure:
I.

Verify that the terminal ready (TR) LED is on. The speed indicator (SI) is either green or red,
depending on the speed selected.

Make sure that the terminal or interface is set to 2400 bits/s or 1200 bits/so Speed buffering is
not functional in test mode.
a. For DMCL mode, press the test loop switch to the IN position. Verify that the TL LED
(inside the test loop switch) goes on, and then the carrier detect (CD) LED goes on.
b. For AT mode, type AT&Tl followed by RETURN. Verify that the CD and TM LEDs come on.

Type a test message on the terminal and verify that the same data is displayed at the terminal.
Incorrect data indicates that:
a. Some modem options such as data, parity, or stop bit selections are set incorrectly.
b. The terminal is set to the wrong speed.
c. The modem is defective.

In DMCL mode, set the test loop switch to the OUT position to terminate the test. The LED will
go out. In AT mode, enter +++ (the escape code). After the OK message, type AT&TO. The
LED will go out.

Remote Digital Loopback Test (DMCL Mode Only)
This test verifies that the DF242 modem can transmit or receive data over the telephone line, through a
remote modem, and back over the telephone line. See Figure DF242-ll.
CAUTION
The remote digitalloopback test operates at 1200 or
2400 bits/s only. The terminal speed setting must be
set to match the modem speed because speed buffering is not functional when loopback is activated.
Procedure (DMCL Mode):
I.

Verify that the TR LED is on. The SI indicator is either green or red, depending on the speed
selected.

Establish a connection by dialing the remote end. When you receive the message ATTACHED,
the modem is connected to the line. Wait for the CD LED to come on.

Press the test loop (TL) switch to the IN position.

The LED inside the test loop switch blinks while the modems are attempting to establish remote
digital loopback (RDL). When RDL is established, the TL LED remains on. If RDL does not
come on, have the remote operator verify that parameter P6 (enable remote/digitalloopback) of
the Operational class parameter group is set on (digital loopback). If the remote modem is not a
DF242, set the remote modem to RDL.

DF242-30

DF242 TESTING

Type a test message on the terminal and verify that the same data is displayed at your terminal.
Incorrect data indicates that:
a. Modem options (data bits, parity, or stop bit) are set incorrectly.
b. Terminal is set to wrong speed.
c. Telephone lines may be noisy or faulty.
d. Remote modem may be defective.

Set the test loop switch to the OUT position to terminate the tests.

Procedure (AT Mode):

Verify that the TR LED is on. The SI indicator is either green or red, depending on the speed
selected.

Establish a connection by dialing the remote end. When you receive the message ATTACHED,
the modem is connected to the line. Wait for the CD LED to come on.

Type +++ (the escape code). After the OK message, type AT&T6 followed by RETURN.

Observe that the TL LED is on.
NOTE

In AT mode, the command AT&T6 forces RDL. The
remote modem must be enabled to respond to the
remote loop (AT&T4).
5.

To terminate the test, type +++ (escape code). After OK message, type AT&TO followed by
RETURN.

DF242-31

DF242 TESTING

IS ON-LINE AND ATTACHED, TO START
REMOTE DIGITAL LOOPBACK.

TEST LOOP PUSH BUTTON MUST BE
OUT AND MODEM MUST BE SET TO
RESPOND TO REMOTE LOOPBACK
REQUEST (OPERATIONAL
PARAMETER P6
ON).

MKV87·1627

Figure DF242-11

Remote Digital Loopback Test

DF242-32

DF242 TESTING

Remote Diagnostic Test
This test allows Field Service personnel to dial from a local modem and to examine the operational
parameters of a remote modem.
1.

On the remote modem, set switchpack 1 (SWPKl) SW3 to the ON position (enable remote
diagnostics).

From the local modem, dial the number of the remote modem.

When a connection has been established between the local and remote modems, type the password
from the local modem's data terminal equipment (DTE).

From the local modem's DTE, use the DMCL command LIST to display parameters.

By viewing the parameters, the user can tell if the remote modem parameters are set up correctly.

To terminate the test, the local modem must be disconnected and the remote modem's SWPKI
SW3 must be set to the OFF position (disable remote diagnostic).

DF242-33

DF242 MAINTENANCE AIDS
DF242 Tech Tips/FCO Index
Table DF242-13 listsTechTips for the DF242 modem.

Table DF242-13 DF242 Tech Tip/FCO Index
Tech Tip/
FCO No.

Title

Speed
Bulletin No.

DF242-CA-TT-Ol

DF242-CA Async DECnet (Hangs)

558·

DF242-34

NOTES

CHAPTER 9
MODEM THEORY

9.1 INTRODUCTION
This chapter provides refresher information on some important aspects of modem communications.
9.2 U.S. MODEM TYPES AND STANDARDS
Typical Bell modem types are listed below.
Bell 103J
Data Rate:
Modulation:
Data Format:
Operation Mode:
Line Connection:
Interface:

o - 300 bls
Frequency Shift Keying (FSK)
Asynchronous, Binary, Serial
Full-Duplex
PSTN
EIA RS-232-C

Bell 201C
Data Rate:
Modulation:
Data Format:
Operation Mode:
Line Connection:
Half-Duplex:
Full-Duplex:
Interface:

2400 bls

Differential Phase Shift Keying (DPSK)
Synchronous, Binary, Serial
Half- or Full-Duplex
PSTN or Two-Wire P ILTN
PSTN or Four-Wire P/LTN
EIA RS-232-C

Bell 212A
Data Rate:
Low Speed:
High Speed:
Modulation:
Low Speed:
High Speed:
Data Format:
Low Speed:
High Speed:
Operation Mode:
Line Connection:
Interface:

o - 300 bls
1200 bls

Frequency Shift Keying (FSK)
Differential Phase Shift Keying (DPSK)
Asynchronous, Binary, Serial
Synchronous, Binary, Serial or Character
Asynchronous, Binary, Serial
Full-Duplex
PSTN or Two-Wire P/LTN
EIA RS-232-C

9-1

9.3 CCITT MODEM TYPES AND STANDARDS
Typical CCITT compatibility standards are listed helow.
CCITT V.22
Data Rate:
Modulation:
Data Format:
Operation Mode:
Line Connection:

1200 his
Differential Phase Shift Keying (DPSK)
Synchronous, Binary, Serial
Full-Duplex
PSTN or Two-Wire P ILTN

CCITT V.22 bis
Data Rate:
Low Speed:
High Speed:
Modulation:
Low Speed:
High Speed:
Data Format:
Operation Mode:
Line Connection:

1200 his
2400 his
Differential Phase Shift Keying (DPSK)
Quadrature amplitude modulation (QAM)
Synchronous, Binary, Serial
Full-Duplex
PSTN and Two-Wire P ILTN

CCITT V.27
Data Rate:
Modulation:
Data Format:
Operation Mode:
Line Connection:
Half-Duplex:
Full-Duplex:

4800 his
Differential Phase Shift Keying (DPSK)
Synchronous, Binary, Serial
Half- or Full-Duplex
PSTN or Two-Wire P ILTN
PSTN or Four-Wire P ILTN

CCITT V.29
Data Rate:
Low Speed:
High Speed:
Modulation:
Low Speed:
High Speed:
Data Format:
Operation Mode:
Line Connection:

4800 his or 7200 his
9600 his
4800 his Quadrature amplitude modulation (QAM)
7200 his 8-point Quadrature amplitude
modulation (QAM)
9600 his 16-point Quadrature amplitude
modulation (QAM)
Synchronous hinary stream data
Full-duplex
Four-wire P/LTN

9-2

9.4 MODEM COMMUNICATIONS CIRCUITS
The two types of modem communications circuits used are:
Public Switched Telephone Network (PSTN) - Used for low-volume data communications at data rates
up to 2400 b/s in full-duplex operation.
The four basic connections are:
•

RJIIC (Figure 9-1) - A miniature six-position jack for single-line non key telephones that
provides a bridged connection to the tip and ring conductors of the telephone line. Typically
associated with residential telephones. The output level is fixed at a maximum of -9 dBm.

•

RJ12C (Figure 9-1) - A miniature six-position jack for single-line key telephones that provides
a bridged connection to the tip and ring conductors of the telephone line and, to the mode
indicate and mode control conductors of the key system. Typically associated with commercial
telephones. The output level is fixed at a maximum of -9 dBm.

•

RJ41S (Figure 9-1) - A miniature eight-position jack for exclusion key telephones that provides
series connections to the tip and ring conductors of the telephone line. Has user switch to select
either fixed loss loop or programmed loss loop. When the switch is set for fixed loss loop, the
modem output level is fixed at -4 dBm. When it is set for programmed loss loop, the output
level is set from 0 to -12 dBm as determined by a telephone company installed resistor.

•

RJ45S (Figure 9-1) - Same as RJ41S except user switch is omitted and the output level is set
from 0 to -12 dBm by a telephone company installed resistor.

Private/Leased Line Telephone Network (P/LTN) - Used for high-volume data communications at data
rates up to 9600 b/s in full-duplex operation.
The two basic connections are:
•

2-wire (Figure 9-2) - Usually used in local telephone loops between the telephone and the local
exchange office. One wire is used for transmission of data in both directions while the other wire
serves as a common ground.

•

4-wire (Figure 9-2) - Usually used between central offices for long distance calls, with one pair
being used for each direction of transmission.

9-3

RJ12C(CA12A)
(COMMERCIAL PERMISSIVE)

RJllC(CAllA)
(RESIDENTIAL PERMISSIVE)
PHONE
UNE

}
B.

PHONE{
UNE

TO OTHER
EQUIPMENT

TO OTHER
} EQUIPMENT

UNE
CIRCUIT

1
1

I-------T-,1

L--I--_ _ _-;V~( : RI NG (R)
L - _ t - -_ _ _-;:4:-<{ : TI P (T)
1

1
1

!...-----==:..!

L--I--_ _ __=__<

MINIATURE
6·POSITION
JACK

PHONE
UNE

: MODE INDICATE (A)

'-+-+_ _ _--"'3-< 1 RING (R)
'---+-!-_ _ _-:4-< : TI P (T)

1
1

i MODE CONTROL (A 1 )
1

L __________ J1

MINIATURE
6·POSITION
JACK

RJ41S (CA41A)
FIXED LOSS/PROGRAMMABLE

RJ45S (CA45A)
PROGRAMMABLE

PHONE{ R
UNE

R
:---------1--1 RING (R)} FIXED LOSS

. . . . .;~~~_T~-<.;" PAD 2 : TIP (T)

LOOP
3 i MODE INDICATE (A)
4
'--I-t-+----::-( iRING (R) } PROGRAMMABLE
'--1--+_ _ _---'5:-<..: TIP (T)
..--'-_ _ _ _""-<1 MODE CONTROL(A1)
: PR } PROGRAMMING
i PC
RESISTOR

MODE INDICATE (A)
RING (R)}
TIP (T)
PROGRAMMABLE

MODE CONTROL (A 1)
PR} PROGRAMMING
PL RESISTOR

!...------~--..!
MINIATURE
8·POSITION
JACK

* HAND SET IS OPTIONAL

MINIATURE
8·POSITION
JACK
MKV86-0816

Figure 9-1

Public Switched Telephone Network (PSTN) Connections

2-WIRE (DF124) CONNECTION
PRIVATE
LINE
CONNECTIONS

2-WIRE (DF127) CONNECTION
RX
REMOTE MODEM

LOCAL MODEM

DRIVER AND TWIST TO
OPEN SPRING CLIP

INSERT SMALL SCREW DRIVER AND TWIST TO
OPEN SPRING CLIP

4-WIRE LEASED
TELEPHONE CONNECTION
(DF126/DF127/DF129)

4-WIRE (DF124) CONNECTION

GREEN
RED
YELLOW
BLACK

OPEN SPRING CLIP

REMOTE MODEM

MKV86-0821

Figure 9-2

Private/Leased Line Network (P /LTN) Connections

9-5

9.5 HANDSHAKING SEQUENCES
Before data is transmitted between local and remote modems, the two modems must be in the data mode
and the communications channel must be established (connect). Figures 9-3 through 9-6 show the channel
connect sequences for Bell 103J and 2I2A type, and V.22 and V.22 bis compatible modems.

1-----

BA - Transmitted Data

CB - Clear to Send

~50m. 265m. -

CC - Data Set Ready

1. . r--

11·_l.5.ec-1

rr-II I
IL
---------V------.;

CF - Carrier Detector

CALLING MODEM

ReV F2M

Mark Hold

BB - Received Data

265m._

CO - Data Terminal Ready
CE - Ring Indicator

(DOlal

ANSWERING MODEM

o
3

Rmging

Answer

0\:.

~5 IDisablo
~;~ ~~MEcho

Transmi t Data
_(eadson Both Modems
Under Controlof
Respecti va OlE s

S.nd FIM ':,
1270 Hz /

\uppr.ssOri

BA - Transmitted Oata
BB - Received Data
CB "- Clear to Send
CC - Data Set Ready
CF - Carrier Detector

150m'-1-tMark Hold

\\
\1

265m'-i

I
3-7 sec

~ _ _ 1.5 , . c - I

(

1. . . .

1
-l.5 •• c - 1 1

I
I
I

CD - Data Terminal Ready
CE - Ring Indicator*

* SOME DTEs DO NOT WAIT FOR RING INDICATOR TO TURN ON DATA TERMINAL READY.
MKV86-0815

Figure 9-3

Bell 103J and 212A (300 b/s) Type Modem Connect Sequences

9-6

DETECT
ANSWER TONE

CONNECT
TO
LINE

XMIT MARKING

•

DATA

155 MS 456 MS'

±50MS ±10MS

CF - CARRIER
DETECTOR

CB - CLEAR
TO SEND

765 MS

i±40 MS

±10MS
I

DETECT
CARRIER

CALLING
MODEM

•270MS

•

- - - - - r-.------ --- f - - - - - - - - - r-.--------ANSWERING
MODEM

270MS
CONNECT
TO
LINE

±40MS
I

I
I

2025 Hz
ANSWER TONE

XMIT MARKING
765 MS

•

SILENCE
2 SEC

TIMEOUT

DETECT ±10 MS
CARRIER

J
I

18 SECONDS

CF - CARRIER
DETECTOR

DATA

CB-CLEARTO ________________________________________

SEND

MKV86-0824

Figure 9-4

Bell 212A (1200 b/s) Type Modem Connect Sequence

9-7

CONNECT
TO
LINE

DETECT UNSCRAMBLED
• BINARY 1 IN 155 ± 50 MS

VVMII

, r456 ± 10 MS

-...-_ ..........

400 MS

I
I

CC - DATA SET r
READY

CB - CLEAR TO
SEND
(NOTE)

BB _ RECEIVED

__________

DATA
WAIT
765 + 10 MS

I
DETECT
SCRAMBLED
I
BINARY 1
,IN 270 ± 40 Msi

~----------~----------~

I
11---------r------i------+-----l.-----1

CLAMPED TO
BINARY 1
I

DATA

CF-CARRIER
____________________
DETECTOR I

SCRAMBLED
BINARY 1

BINARY 1

DATA

--l~~P-~~~~~~~----~-----r-----t-------------------TRANSMITIED
LINE SIGNAL

SILENCE

Ii.... .

. -- .

i
DATA AND 1800 Hz

•

CF - CARRIER
DETECTOR

CB - CLEAR TO
SEND

----------------------------------------------------------~,

BINARY 1

CLAMPED TO BINARY 11

BB - RECEIVED
DATA
NOTE

J I""I--D-A-T-A-------

CARRIER PRESENT DOES NOT SIGNIFY THE DTE CAN
TRANSMIT
MKV86-0822

Figure 9-5

CCITT V.22 and V.22 bis (1200 b/s) Compatible Modem Connect Sequences

CONNECT
TO LINE
•
CALLING TONE
1300 Hz, 0.5 SEC ON
1.5 SEC OFF

CC - DATA SET _ _ _ _ _ _ _ _-!
READY
CI- DATA RATE
SELECT
(NOTE 3)
CF- CARRIER
DETECTOR
CB - CLEAR TO
SEND
(NOTE 2)

I I

DETECT 32
BITS OF
BINARY 1

CALLING MODEM

--------------------------ANSWERING MODEM

I I

SCRAMBLED BINARY 1
@ 1200 b/s

I
I
CC-~~~~;ET----------------~I

I
'I

TO LINE

SILENCE

SILENCE'

FOR 2.1
SECONDS

FOR 75 MS

CI- DATA RATE

SRm

CF- CARRIER
DETECTOR

CB - CLEAR TO

.•

450 MS

DATA

114' g~TsEg~

32
BINARY 1

SEND

SCRAMBLED BINARY 1
@ 2400 b/s

,I
II'I
~~------~"'~~~--~------I .

I _______________

("00 "I.

t
BEGIN 16.WAY

NOTE 1

UNSCRAMBLED DOUBLE DIBIT
00 AND 11 @ 1200 b/s

NOTE 2

CARRIER PRESENT DOES NOT SIGNIFY THE DTE CAN
TRANSMIT

NOTE 3

ABORT IF SPEED MISMATCH

Figure 9-6

DECISIONS IN
RECEIVER

CCITT V.22 bis (2400 b/s) Compatible Modem Connect Sequence

9.6 CONSTELLATION DISPLAYS
A method of presenting the different signal formats for quadrature amplitude modulation (QAM) or
differential phase shift keying (DPSK) at data rates of 1200 bls and higher is the signal constellation
display. This is the display of demodulated signal amplitude and phase. In this constellation display:
•

Each point shown represents a signal element comprising the bits in the element as determined
by its location in the signal space. Figures 9-7, 9-8, and 9-9 show the constellation displays for 2,
3, and 4 bits in an element.

•

A good quality communications line is better represented with the modem in remote loopback
mode.

•

Good demodulated signal quality is represented with less displacement in the dot position.
Figure 9-10 shows a constellation display with dot patterns representing good quality.

•

Poor demodulated signal quality is represented by a great amount of displacement in the dot
position. Figure 9-10 shows a constellation display with dot patterns representing poor quality.

•

A 2-dot pattern is shown once the data exchange between two modems begins. When the
amplitude or phase modulated signal is exchanged, either a 4-, 8-, or 16-dot pattern is displayed .

•

BELL 212A (@1200 b/s)

CCITI V.22 (@1200 b/s)

CCITT V.29 (@4800 b/s)

MKV86-0817

Figure 9-7

Constellation Displays for 2-Bit Elements

9-10

•

CCITT V.27 (@7200 b/s)

•

GCITT V.29 (@7200 b/s)

MKV86·0818

Figure 9-8

Constellation Displays for 3-Bit Elements

•

• •

CCITT V.29 (@9600 b/s)

• •
•

•

•
•

•

•
•

CCITT V.22 bis (@2400 b/s)

MKV86·0819

Figure 9-9

Constellation Displays for 4-Bit Elements

9-11

POOR QUALITY DUE
TO GAIN ERRORS

POO R QUALITY DU E TO
PHASE ERRORS

POOR QUALITY DUE
TO COMBINATION
OF RANDOM NOISE,
PHASE ERROR,
AND/OR GAIN ERROR

CIRCLE REPRESENTS
PROPER POSITION
OF GOOD
QUALITY SIGNAL

MKV86·0820

Figure 9-10

2-Bit Element Constellation Display with Good and Poor Quality Represented

9.7 P/LTN LINE CONDITIONING
Line conditioning is the process of controlling the electrical properties of the private/leased line for a result
in higher transmission rates (above 2400 b/s) and/or a reduction in data errors. Tables 9-1 and 9-2 list the
the types of conditioning levels for various transmission line impairments.
For more information on line conditioning, refer to the Bell System Technical Reference PUB 41004,
Data Communication Using Voiceband Private Line Channels.

9-12

Table 9-1

Line Conditioning Specifications for Transmission Line Impairments
LINE CONDITIONING
D-2

IMPAIRMENT

BASIC CHANNEL

C-l C-2 C-3 C-4 C-5

D-l

Intermodulation
Distortion

Second Order 27 dB
Third Order 32 dB

Second Order 28 dB
Third Order 40 dB

C Notched Noise

At least 24 dB below received
1004 Hz test tone

At least 28 dB
below received
1004 Hz test tone

Impulse Noise

Threshold with
Repeat to
Receiver 1004 Hz
Test Tone

Max. Counts
Allowed in
15 Minutes

-2 dB
2 dB
6 dB
C Message Noise

Facility Miles

5
9
15
Max. Noise

8001
4001
2501
1501
1001
401
101
51

- 16000
- 8000
- 4000
- 2500
- 1500
- 1000
- 400
- 100
o - 50

Phase Jitter

Conductor
Length (Miles)

2001 - 4000
1001 - 2000
501 - 1000
251 - 500
0 - 250

50 dBm
47
44
42
40
38
34
31
28
Max. Degree
Peak-to-Peak
4-20
Hz

4-300 20-300
Hz
Hz

5
5
5
5
5

15
13
II
9
7

10
8
5
4
3

1004 Hz Loss

No more than +/- 4 dB long term
and +/ - 3 dB short term

Phase Hits

</- 8 in 15 min. >/- 20 dB

Gain Hits

</- 8 in 15 min. >/- 3 dB

Dropouts

</- 2 in 15 min. >/- 12 dB

Envelope
Delay

Refer to Table 9-2

Attenuation
Distortion

Refer to Table 9-2

Peak-to-Average RatIOS (P/ AR) are not set. It Is recommended that after line acceptance by an envelope delay and attenuation distortion
measurement, that a P/AR measurement be taken and the results recorded as a benchmark. A future reading of +/- 4 P/AR units indicates
trouble in envelope delay, return loss, or attenuation distortion.

* Same as the Basic Channel column.

9-13

Table 9-2

Bandwidth Parameter Limits for Certain Line Conditioning Techniques (See Notes 1 and 2)
Attenuation Distortion
(Frequency Response)
Relative to 1004 Hz

Envelope Delay
Distortion

Channel
Conditioning

Frequency
Range (Hz)

Variation
(dB)t

Frequency
Range (Hz)

(JLs)

Variation

Basic

500 - 2500
300 - 3000

-2 to +8
-3 to +12

800 - 2600

1750

*1000 - 2400
*300 - 2700
300 - 3000

-1 to +3
-2 to +6
-3 to +12

*1000 - 2400
800 - 2600

1000
1750

*500 - 2800
*300 - 3000

-1 to +3
-2 to +6

* 1000 - 2600
*600 - 2600
*500 - 2800

500
1500
3000

C3
(access line)

*500 - 2800
*300 - 3000

-0.5 to +1.5
-0.8 to +3

*1000 - 2600
*600 - 2600
*500 - 2800

110
300
650

C3
(trunk)

*500 - 2800
*300 - 3000

-0.5 to +1.5
-0.8 to +2

*1000 - 2600
*600 - 2600
*500 - 2800

80
260
500

*500 - 2800
*300 - 3200

-2 to +3
-2 to +6

*1000 - 2600
*800 - 2800
*600 - 3000
*500 - 3000

300
500
1500
3000

*500 - 2800
*300 - 3000

-0.5 to +1.5
-1 to +3

*1000 - 2600
*600 - 2600
*500 - 2800

100
300
600

NOTES:
1.

C conditioning applies only to the attenuation and envelope delay characteristics.

Measurement frequencies will be 4 Hz above those shown. For example, the basic channel will have -2 to
+8 dB loss, with respect to the 1004 Hz loss, between 504 and 2504 Hz.

* These specifications are tariffed items.
t

(+) means loss with respect to 1004 Hz.
(-) means gain with respect to 1004 Hz.

9-14

9.8 THE TIMS AND TESTING THE TELEPHONE LINE
The Hewlett Packard 4945A transmission impairment measuring set (TIMS) is used to measure the
quality of the telephone line. Measurements performed by the TIMS include:
•

Level and Frequency - To determine amplitude and frequency response of a voice channel.

•

Gain Slope - To determine usable bandwidth of a voice channel.

•

Signal-to-Noise - To determine the interference effects of background noise and tones.

•

Noise-to-Ground - To determine the longitudinal noise presence on a voice channel with respect
to ground.

•

Transients - To determine simultaneous impulse noise, phase hits, gain hits, and dropout counts.

•

Jitter - To determine if unwanted phase or frequency modulation, and incidental amplitude
modulation caused by interference and noise are present.

•

Envelope Delay - To determine the phase linearity or nonlinearity.

•

Intermodulation Distortion - To determine if new signal components are present in the original
transmitted signal.

•

Return Loss - To determine how well the input and output impedances are matched throughout
a circuit.

•

Peak-to-Average Ratio - To determine the fidelity of a channel as a benchmark for future
reference. Then, if trouble is suspected, the measurement is taken again for an indication of
either envelope delay, attenuation distortion, or return loss.

For more information on the HP 4945A TIMS, refer to the Hewlett Packard 4954A Transmission
Impairment Measuring Set Operating Manual (Manual Part Number 04945-90023).

9.9 IMPORTANT TELEPHONE LINE MEASUREMENTS
The telephone line measurements that are most important to Digital Equipment Corporation field service
personnel are:
•

Signal-to-Noise - 3 kHz weighted.

•

Level-and-Frequency - .6 to 3 kHz insteps of 100 Hz.

•

Envelope Delay - .6 to 3 kHz insteps of 100 Hz.

9-15

NOTES

Communications Options Minireference Manual
Volume 1 General Information and
Communications Options
EK-CMIV1-RM-005

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