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Document:	DSH80 Option Installation & Owner's Manual
Order Number:	EK-DSDSH-IN
Revision:	001
Pages:	47
Original Filename:

OCR Text

DSH80 Option
Installation and Owner’s Manual
Order Number EK–DSDSH–IN–001

Digital Equipment Corporation
Maynard, Massachusetts

First Printing, July 1991
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.
The software, if any, described in this document is furnished under a license and may be used
or copied only in accordance with the terms of such license. No responsibility is assumed
for the use or reliability of software or equipment that is not supplied by Digital Equipment
Corporation or its affiliated companies.
Restricted Rights: Use, duplication or disclosure by the U.S. Government is subject to
restrictions as set forth in subparagraph (c)(1)(ii) of the Rights in Technical Data and Computer
Software clause at DFARS 252.227–7013.
© Digital Equipment Corporation 1991. All rights reserved.
Printed in U.S.A.
The Reader’s Comments form at the end of this document requests your critical evaluation to
assist in preparing future documentation.
The following are trademarks of Digital Equipment Corporation: DEC, DECnet, DECserver,
DECsystem 5100, DECUS, DECwriter, DELNI, DELQA, DEQNA, DESTA, DSSI, IVIS,
Letterprinter, Letterwriter, MicroVAX, PDP, Professional, Q-bus, ReGIS, RQDX, ScriptPrinter,
ThinWire, ULTRIX, UNIBUS, VAX, VAX 4000, VAXcluster, VAX DOCUMENT, VAXELN,
VAXlab, VMS, VT, and

FCC NOTICE: The equipment described in this manual 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 pursuant to Subpart J of Part 15 of FCC Rules, which are designed
to provide reasonable protection against such radio frequency interference 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.
S1625

This document was prepared using VAX DOCUMENT, Version 1.2.

Contents
vi

Preface
Chapter 1 Introduction to the DSH80 Option
Chapter 2 Owner Information and System Requirements
2.1
2.2
2.2.1
2.3
2.3.1
2.3.2
2.4
2.5

Software Requirements . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Asynchronous Ports . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Baud Rates . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Synchronous Ports . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Connection to Synchronous Ports . . . . . . . . . . . . . . . . . . . .
Adapter Cables and Protocol Standards . . . . . . . . . . . . . . .
Power-Up Self-Tests and Consequences . . . . . . . . . . . . . . . . .
Software Documentation for WAN Device Drivers . . . . . . . . .

2–1
2–1
2–1
2–2
2–2
2–2
2–3
2–3

Chapter 3 Installing the DSH80 Synchronous/Asynchronous
Option
3.1
3.2
3.3
3.4
3.5
3.6
3.7
3.8
3.9
3.10
3.11

Shutting Down the System and Removing the DECsystem
5100 Cover . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Removing the DHT80 Option . . . . . . . . . . . . . . . . . . . . . . . . .
Removing Blank Cover Plates (No DHT80 Option) . . . . . . . .
Removing Upper and Lower Drive Shelves . . . . . . . . . . . . . .
Add Standoffs and 100-Way Cable (No DHT80) . . . . . . . . . . .
Trimming Two of the Standoffs . . . . . . . . . . . . . . . . . . . . . . .
Installing Sync Module One . . . . . . . . . . . . . . . . . . . . . . . . . .
Installing Sync Module Two and Connecting Both Modules . .
Adding and Removing Labels . . . . . . . . . . . . . . . . . . . . . . . . .
Replacing the System Cover . . . . . . . . . . . . . . . . . . . . . . . . . .
Removing a Faulty DSH80 Option . . . . . . . . . . . . . . . . . . . . .

3–2
3–3
3–5
3–6
3–9
3–11
3–12
3–14
3–16
3–17
3–17

iii

Chapter 4 Advanced Diagnostics
4.1
4.2
4.3
4.4
4.5

Power-Up Test . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Including the DSH80 in the Environment Variable Table . . .
Testing Sync and Async Lines Together . . . . . . . . . . . . . . . . .
Testing Async Lines Together or Separately . . . . . . . . . . . . . .
Testing the Sync Lines . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

4–1
4–2
4–4
4–6
4–7

Appendix A Field-Replaceable Units for the DSH80
Synchronous/Asynchronous Option
Appendix B Cable Lengths and Order Numbers
B.1

Distance Specifications for Cables . . . . . . . . . . . . . . . . . . . . .

B–1

Appendix C Connectors, Cables, and Loopbacks
C.1
C.2
C.3
C.4
C.5
C.6
C.7

Synchronous (D-Sub) Connectors . . . . . . . . . . . . . . . . . . . . . .
Asynchronous (MMJ) Connectors . . . . . . . . . . . . . . . . . . . . . .
Synchronous Line Adapter Cables . . . . . . . . . . . . . . . . . . . . .
Asynchronous Line Adapter Cable . . . . . . . . . . . . . . . . . . . . .
Extension Cables . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Synchronous Loopbacks . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Asynchronous Loopback . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

C–1
C–1
C–4
C–4
C–5
C–5
C–5

Appendix D United Kingdom Specifications
D.1
D.2
D.3
D.4

Service Category Specifications . . . . . . . . . . . . . . . . . . . . . . .
Direct Connection (BABT/SITS/89/43 Section 4.2) . . . . . . . . .
Apparatus Between DECsystem 5100 and Digital Circuit
(PTT) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Safety Warning for UK Installations . . . . . . . . . . . . . . . . . . .

D–1
D–1
D–2
D–2

Figures
1–1
1–2
3–1
3–2
3–3
3–4
3–5
3–6
3–7
3–8
3–9
3–10
3–11
3–12
3–13
3–14
3–15

DSH80 Synchronous/Asynchronous Option . . . . . . . . . . . . . .
DECsystem 5100 with DSH80 Option Installed . . . . . . . . . . .
Cover Screw Locations . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Disconnecting the Modem Cable and Port . . . . . . . . . . . . . . .
Removing the DHT80 Asynchronous Module . . . . . . . . . . . . .
Removing Blank Cover Plates . . . . . . . . . . . . . . . . . . . . . . . .
Disconnecting Cables from Upper Drive Shelf . . . . . . . . . . . .
Removing Upper Drive Shelf . . . . . . . . . . . . . . . . . . . . . . . . .
Removing Lower Drive Shelf . . . . . . . . . . . . . . . . . . . . . . . . .
Inserting Five Standoffs on Lower Drive Mounting Panel . . .
Connecting 100-Way Connector to System Board . . . . . . . . . .
Locating the Two Standoffs to Be Trimmed . . . . . . . . . . . . . .
Installing Sync Module One . . . . . . . . . . . . . . . . . . . . . . . . . .
Locking the Connector Clips . . . . . . . . . . . . . . . . . . . . . . . . .
Removing Two Hex Nuts from Sync Module Two . . . . . . . . . .
Installing Sync Module Two . . . . . . . . . . . . . . . . . . . . . . . . . .
DECsystem 5100 with DSH80 Option Installed . . . . . . . . . . .

1–2
1–3
3–2
3–3
3–4
3–5
3–6
3–7
3–8
3–9
3–10
3–11
3–12
3–13
3–14
3–15
3–16

Tables
2–1
2–2
3–1
A–1
B–1
B–2
C–1
C–2
C–3
D–1

Asynchronous Ports . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2–1
Protocols, Cables, and Loopback Connectors . . . . . . . . . . . . . 2–2
Connectors, Their Associated Line Numbers, and Labels . . . . 3–16
FRUs for the DSH80 Option . . . . . . . . . . . . . . . . . . . . . . . . . A–1
Maximum Communication Distances . . . . . . . . . . . . . . . . . . . B–1
Cables for Customer Ordering . . . . . . . . . . . . . . . . . . . . . . . . B–2
MMJ Connectors . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . C–1
D-Sub Full Function Connector Pinouts . . . . . . . . . . . . . . . . . C–2
Synchronous Line Extension Cables . . . . . . . . . . . . . . . . . . . C–5
Specifications for Service Categories (SC) 1 and 2 . . . . . . . . . D–1

Preface
This manual provides information for Digital service representatives
on installing, configuring, and diagnosing the DSH80 Synchronous
/Asynchronous communications controller option. This manual provides
customers with information on DSH80 option protocols, cabling, and powerup self-tests.
NOTE: The DSH80 option must be installed and serviced by Digital service
personnel or self-maintenance customers only.
Since in most cases the DSH80 option will be a replacement for the DHT80
Asynchronous option, procedures are included for removing the DHT80 if
it is present. The manual is organized as follows:
•

Chapter 1 is an introduction to the DSH80 option.

•

Chapter 2 contains information for the customer on power-up self-tests,
minimum software requirements, protocols, and external cables.

•

Chapter 3 describes the installation procedures for the DSH80 modules.

•

Chapter 4 gives explicit procedures for power-up, configuration of the
hardware, and the use of hardware diagnostics.

•

Appendix A lists the field-replaceable units of the DSH80 and their part
numbers.

•

Appendix B lists the cables that can be ordered by the user.

•

Appendix C lists the electrical and cable specifications.

•

Appendix D gives details on connectors, cables, and loopbacks.

•

Appendix E includes specifications for use in the United Kingdom.

Conventions
The following naming conventions are used in this manual:
•

DHT80 Asynchronous option is called the DHT80 option.

•

DSH80 Synchronous/Asynchronous option is called the DSH80 option.

•

The two modules in the DSH80 option are called Sync Module One
and Sync Module Two.

The following typeface and character conventions are used in this manual:
Convention

Meaning

Return

A key name is shown enclosed to indicate that you press a named
key on the keyboard.

Ctrl/x

A sequence such as Ctrl/x indicates that you must hold down the
key labeled Ctrl while you press another key.

bold

Boldface type indicates user input. For example: >> boot

NOTE

Notes provide general information about the current topic.

CAUTION

Cautions provide information to prevent damage to equipment
or software. Read these carefully.

WARNING

Warnings provide information to prevent personal injury. Read
these carefully.

vii

Chapter 1

Introduction to the DSH80 Option
On the DECsystem 5100, either a DHT80 option or a DSH80 option may be
installed. This chapter describes the basic features of the DSH80 option.
The protocols recognized by the DSH80 option are HDLC (High-Level Data
Link Control) and SDLC (Synchronous Data Line Control).
The DSH80 option consists of two modules, Sync Module One and
Sync Module Two, that together contain two synchronous lines and four
asynchronous lines.
Sync Module One is the larger of the two modules, and mounts on the lower
drive mounting panel. It contains the following:
•

One synchronous line with a 50-pin D-sub connector

•

Four DEC–423–compatible asynchronous lines with four MMJ
connectors

This module also contains three captive screws for mounting, a 100-way
high-density connector, and a 50-way high-density connector.
Sync Module Two is the smaller of the two modules, and mounts on top of
Sync Module One. It contains the following:
•

One synchronous line with a 50-pin D-sub connector

Introduction to the DSH80 Option

1–1

Figure 1–1 shows the two modules.
Figure 1–1: DSH80 Synchronous/Asynchronous Option

Sync Module Two

50-Way Connector
for Sync Module
One Cable

Sync Module One
Connector for
Signal Cable
from System Module

Captive Screws (3)

50-Way Connector for
Second Sync Module Two Cable

MLO-006313

1–2 DSH80 Option Installation and Owner’s Manual

Figure 1–2 shows the rear view of the DECsystem 5100, including the
DSH80 option.
Figure 1–2: DECsystem 5100 with DSH80 Option Installed
MMJ Ports 4-7
and Label

Sync Chanel 2
and Label

Sync Channel 1
and Label

Power Switch

MLO-006328

Introduction to the DSH80 Option

1–3

Chapter 2

Owner Information and System
Requirements
This chapter contains information for the owner or user of the DSH80
module.

2.1 Software Requirements
Software requirements are as follows:
ULTRIX 4.2
DECnet Phase V (contains DEC WAN device driver for V2.0)

2.2 Asynchronous Ports
Standard asynchronous serial lines (data leads only) are shown in
Table 2–1, which correlates TTY numbers with the port numbers on the
rear of the DECsystem 5100.

Table 2–1: Asynchronous Ports
Number

Port
Number

2.2.1 Baud Rates
The following baud rates are supported: 300, 600, 1200, 1800, 2000, 2400,
3600, 4800, 7200, and 9600. (Baud rates of 19 200 and 38 400 are available
using alternate clocks.)

Owner Information and System Requirements

2–1

2.3 Synchronous Ports
This section covers the connection to synchronous ports, the adapter, the
protocols, and cables.

2.3.1 Connection to Synchronous Ports
With the DSH80 option installed in the DECsystem 5100, there are two
synchronous serial 50-pin ports on the rear of the chassis. The lower port,
labelled 1, is port dsh0; the upper port, labelled 2, is port dsh1. The 50-pin
connector contains the composite connections to all the standards supported
by the DSH80. An adapter cable is required to connect to the synchronous
service available at the site. Match the correct interface with the correct
adapter.

2.3.2 Adapter Cables and Protocol Standards
Use a separate adapter cable for each protocol standard. Table 2–2 shows
the standards along with cables, baud rates, and loopbacks. Also see
Table B–2 for cable order numbers.
The V.24/EIA–232–C adapter (12–27591) must be fitted between the device
cable and the server if the modem or modem eliminator has DCE-sourced
signal on pin 18, signal quality implemented on pin 21, and/or data signal
rate selector (DCE) on pin 23.

Table 2–2: Protocols, Cables, and Loopback Connectors
Interface

Pins

Baud Rate

Adapter
Cable

Loopback
Connector

EIA–232–E

19 200

BC19D–02

H3248

BC23V–02

H3266

BC19D–02

H3248

BC23V–02

H3266

V.28/V.24/ISO2110.5

19 200

EIA–423A/EIA–449

64 000

BC19E–02

H3198

V.10/ISO4902

64 000

BC19E–02

H3198

EIA–422–A/EIA–449

64 000

BC19B–02

H3198

V.11/ISO4902

64 000

BC19B–02

H3198

V.35/ISO2593

64 000

BC19F–02

H3250

2–2 DSH80 Option Installation and Owner’s Manual

NOTE: An H3199 total loopback connector may be used for all interfaces.
CAUTION: Failure to fit an adapter can result in damage to the interface
module and modem or modem eliminator. If you are unsure what signals
the modem or modem eliminator provide, contact your Digital service
representative.

2.4 Power-Up Self-Tests and Consequences
The power-up self-test for the DECsystem 5100 is activated whenever the
system is turned on. The first example below shows a successful test, and
the second example shows an unsuccessful test.
26..25..24..23..22..21..20..19..18..17..16..15..14..14..14..
13..12..11..10..09..08..07..06..05..04..03..
KN230 V1.x
08-00-2b-17-48-7a
0x10000000
>>

The string ?40 indicates a failure in the DSH80 option (test 40). Such a
failure of the DSH80 option is displayed as follows.
26..25..24..23..22..21..20..19..18..17..16..15..14..14..14..
13..12..11..10..09..08..07..06..05..
?40 21 ff 0001
P1= 00000040 P2= 00000051 P3= b52ffffd P4= 000000a5 P5= 000000a4
P6= 00000000 P7= 00000000 P8= 00000000 P9= 00000000 P10=00000000
gp= 00800000 sp= a000f794 fp= 00000000 sr= b0480000
epc=bfc2a1e4 badvaddr=00060000 cause=00000000
04..03..
KN230 V1.x
08-00-2b-17-48-7a
0x10000000

Contact your Digital service representative if the test is unsuccessful.

2.5 Software Documentation for WAN Device
Drivers
At this point the hardware verification is finished. You should now review
the following documents covering Wide Area Network Device Drivers:
WAN DD Programmer’s Guide (AA–NX52A–TE)
WAN DD Installation Manual (AA–NX50A–TE)

Owner Information and System Requirements

2–3

Chapter 3

Installing the DSH80
Synchronous/Asynchronous Option
NOTE: Installation is to be done only by Digital service representatives or
by qualified self-maintenance personnel.
The sequence for installing the DSH80 option depends on whether the
DHT80 option is already installed in the DECsystem 5100. If so, it must
be removed and the DSH80 option mounted in its place. Two separate
modules make up the DSH80 option. Installing the DSH80 option follows
this procedure:
1. Shutting down the system and removing the DECsystem 5100 cover
2. Removing the DHT80 option (if present)
3. Removing the blank cover plates (if present)
4. Removing the upper and lower drive shelves
5. Adding standoffs and the 100-way cable
6. Trimming two of the standoffs
7. Installing Sync Module One
8. Installing Sync Module Two and connecting both modules
9. Adding labels to the ports
10. Replacing the DECsystem 5100 cover
11. Removing the DSH80 option if faulty
If there is a DHT80 Option in place now, go to Section 3.1, Section 3.2,
and then Section 3.6 to the end.
If there is NOT a DHT80 Option in place now, go to Section 3.1, and
then Section 3.3 to the end.

Installing the DSH80 Synchronous/Asynchronous Option

3–1

3.1 Shutting Down the System and Removing the
DECsystem 5100 Cover
1. Perform an orderly system shutdown of the ULTRIX operating system
from the console.
2. Set the Power switch to off (0) on the DECsystem 5100 and all expansion
enclosures.
3. Mark and disconnect all cables to the DECsystem 5100.
4. Loosen the two Phillips screws holding the cover. (See Figure 3–1.)
From the rear of the DECsystem 5100, slide the cover forward and lift
it away from the system.
Figure 3–1: Cover Screw Locations

Cover Screw

Cover Screw
MLO-006314

3–2 DSH80 Option Installation and Owner’s Manual

3.2 Removing the DHT80 Option
If the system contains the DHT80 option, remove the option and the modem
port as described below. If not, proceed to Section 3.3.
1. Disconnect the modem ribbon cable (25-way, 17–02908–01) from the
connector on the DHT80 option as shown in Figure 3–2. (For clarity,
the upper drive shelf is not pictured in Figure 3–2.)
2. Remove the two outer Phillips screws that hold the modem cable and
the connector (74–41591–01) to the chassis. Remove the modem cable
and the connector.
Figure 3–2: Disconnecting the Modem Cable and Port

Phillips Screws (2)
100-Way
Cable

25-Way
Cable

MLO-006315

Installing the DSH80 Synchronous/Asynchronous Option

3–3

3. Disconnect the 100-way cable (17–02295–02) from the DHT80 option as
shown in Figure 3–2.
4. Loosen the three captive screws on the DHT80 option shown in
Figure 3–3. For the sake of clarity, the upper drive shelf is not shown.
Figure 3–3: Removing the DHT80 Asynchronous Module

Captive Screws(3)

MLO-006316

5. Pull the DHT80 option off the standoffs and out of the system. Go to
Section 3.6.

3–4 DSH80 Option Installation and Owner’s Manual

3.3 Removing Blank Cover Plates (No DHT80
Option)
If the system does not have a DHT80 option, then it has blank cover plates.
Remove the plates as shown in Figure 3–4.
1. Remove the two Phillips screws on the upper blank plate (74–38986–
01), and remove the upper blank plate, as shown in Figure 3–4.
2. Loosen the captive screw on the lower blank plate (74–41590–01) and
remove.
Figure 3–4: Removing Blank Cover Plates
Upper
Blank Plate

Phillips
Screws(2)

Captive
Screw
Lower
Blank Plate

MLO-006317

Installing the DSH80 Synchronous/Asynchronous Option

3–5

3.4 Removing Upper and Lower Drive Shelves
Removal of upper and lower drive shelves is detailed below.
1. Note the position of the mass storage drives, and mark the cables
accordingly. Disconnect the power cables and SCSI bus cable( s ) from
the drives on the upper drive shelf. (See Figure 3–5 for a symbolic
wiring diagram.)
Figure 3–5: Disconnecting Cables from Upper Drive Shelf
Adapter (TZ30 Only)
SCSI Connector
to System Module

External SCSI
Connector

Power Connectors
for RX23 FDI
Boards

RZ23 or
RZ24 or
RX23

Power
Supply

TZ30 or
RZ23 or
RZ24 or
RX23

Lower Drive
Mounting Panel

Upper Drive
Mounting Panel

RZ23 or
RZ24

Upper Drive Panel Power
Lower Drive Panel Power
Data
MLO-006318

3–6 DSH80 Option Installation and Owner’s Manual

2. Loosen the four captive screws. (See Figure 3–6.)
3. Lift the upper drive shelf away from the lower drive shelf and gently
set it aside.
4. Mark and disconnect the SCSI cable( s ) and the power cable connected
to the drives on the lower drive shelf. (See Figure 3–5.)
Figure 3–6: Removing Upper Drive Shelf
Captive
Screws (2)

Upper Drive
Shelf
Captive
Screws (2)

MLO-006319

Installing the DSH80 Synchronous/Asynchronous Option

3–7

5. Loosen the four captive screws and remove the three Phillips screws
and store safely. (See Figure 3–7.)
6. Slide the lower drive shelf toward you and lift it from the unit.
Figure 3–7: Removing Lower Drive Shelf
Captive
Screws (2)

Lower
Drive Shelf

Captive
Screws (2)

Phillips
Screws (3)

MLO-006320

3–8 DSH80 Option Installation and Owner’s Manual

3.5 Add Standoffs and 100-Way Cable (No DHT80)
After removing the upper and lower drive shelves, add standoffs to the
lower drive mounting panel as follows:
1. Through the bottom of the lower drive mounting panel, add five
standoffs in the positions shown in Figure 3–8. The lip of each standoff
is to face the outside of the panel.
Figure 3–8: Inserting Five Standoffs on Lower Drive Mounting Panel

Standoffs

Standoff Lip

Insert
Standoffs(5)
Through
Bottom

MLO-006321

Installing the DSH80 Synchronous/Asynchronous Option

3–9

2. Connect the 100-way ribbon cable (17–02295–02) to the system board,
as shown in Figure 3–9. Fit the connector key correctly to the connector
slot on the system board, and lock the 100-way connector in place with
the connector locks.
3. Replace the lower drive shelf, the three Phillips screws, and the four
captive screws shown in Figure 3–6.
CAUTION: Failure to fit the key of the ribbon cable connector into the slot
on the system connector can later cause damage to the components.
Figure 3–9: Connecting 100-Way Connector to System Board

100-Way
Cable

MLO-006322

3–10 DSH80 Option Installation and Owner’s Manual

3.6 Trimming Two of the Standoffs
Trim the tabs on two of the standoffs (12–21566–05) as shown in
Figure 3–10.
1. See Figure 3–10 for the location of the two standoffs to be trimmed.
2. Use wire cutters to trim the standoffs, and replace the standoffs. Be
sure to retrieve and dispose of the trimmed pieces.
Figure 3–10: Locating the Two Standoffs to Be Trimmed

Trim Standoff

Before

After

Trim Standoffs (2)

MLO-006323

Installing the DSH80 Synchronous/Asynchronous Option

3–11

3.7 Installing Sync Module One
Sync Module One (54–20472–01) is the larger of the two modules, and
contains the asynchronous ports. Install as follows:
1. Align the connectors on Sync Module One with the openings in the rear
of the chassis.
2. Match the three captive screws on Sync Module One to the three holes
on the lower drive mounting panel.
3. Press the module into the five standoffs on the lower drive mounting
panel, as shown in Figure 3–11, and tighten the three captive screws
on Sync Module One.
Figure 3–11: Installing Sync Module One
Sync Module One

MLO-006324

3–12 DSH80 Option Installation and Owner’s Manual

4. Connect the 50-way ribbon cable (17–01243–04) to the 50-way connector
on Sync Module One. Lock the connector in place with connector clips.
(See Figure 3–12.)
5. Connect the 100-way ribbon cable (17–02295–02) from the system board
to the 100-way connector on Sync Module One. Lock the connector in
place. (See Figure 3–12.)
6. Install the upper drive shelf.
CAUTION: Failure to fit the key of the ribbon cable connector into the slot
on the system connector can later cause damage to the components.
Figure 3–12: Locking the Connector Clips

100-Way
Cable

50-Way
Cable

MLO-006325

Installing the DSH80 Synchronous/Asynchronous Option

3–13

3.8 Installing Sync Module Two and Connecting
Both Modules
Sync Module Two (54–20874) is installed directly above Sync Module One.
1. Use a nut driver to remove the two 3/16-inch hex nuts from the 50-way
D-sub connector on Sync Module Two. (See Figure 3–13.)
2. Fit the 50-way D-sub connector through the opening in the rear of the
chassis.
3. Press the module onto the single standoff located on the upper drive
shelf. (See Figure 3–14.)
Figure 3–13: Removing Two Hex Nuts from Sync Module Two

Hex Nuts (2)
MLO-006326

3–14 DSH80 Option Installation and Owner’s Manual

4. Replace and tighten the two 3/16-inch hex nuts.
through the chassis to secure the D-sub connector.

The hex nuts go

5. Connect the 50-way ribbon cable (17–01243–04) joining Sync Module
One to the 50-way connector on Sync Module Two.
See Figure 3–14 for the correct cable bend. Lock the connector in place.
CAUTION: Failure to fit the ribbon cable connector tab into the slot on the
system connector can later cause damage to the components.
Figure 3–14: Installing Sync Module Two

Standoff
Sync Module Two
50-Way
Cable

Sync Module One

MLO-006327

If you replaced a DHT80 option with the DSH80 option, you will have
the following items left over from your DSH80 kit: a 100-way cable, five
standoffs, and the label "4, 5, 6, 7."

Installing the DSH80 Synchronous/Asynchronous Option

3–15

3.9 Adding and Removing Labels
Once the DSH80 option is installed, labels must be added to distinguish the
two D-sub connectors (synchronous) and the MMJ connector (asynchronous)
ports. See Figure 3–15 for placement of these labels, and Table 3–1 for port
names, line numbers, and label part numbers.
From the rear of the chassis, remove the label marked "8, 9, and 10," if it
is there.
Figure 3–15: DECsystem 5100 with DSH80 Option Installed
MMJ Ports 4-7
and Label

Sync Chanel 2
and Label

Sync Channel 1
and Label

Power Switch

MLO-006328

Table 3–1: Connectors, Their Associated Line Numbers, and
Labels
Port Name

Line No.

Label Part No.

MMJ 4

36–33715–03

MMJ 5

MMJ 6

MMJ 7

Upper D-sub

Sync channel 2

36–35733–01

Lower D-sub

Sync channel 1

36–35733–01

3–16 DSH80 Option Installation and Owner’s Manual

3.10 Replacing the System Cover
Replace the cover of the DECsystem 5100 as follows:
1. From the front of the system, slide the cover on.
2. Replace and tighten the two Phillips screws.
Hardware installation is complete. Go to Chapter 4 to make sure the system
recognizes the new option.

3.11 Removing a Faulty DSH80 Option
If the diagnostics described in Chapter 4 show the DSH80 option to be
faulty, you can remove it as follows:
1. Disconnect the 50-way ribbon cable (17–01243–04) connecting Sync
Module One to Sync Module Two.
2. Remove the two 3/16-inch hex nuts from the 50-way D-sub connector
on Sync Module Two.
3. Lift Sync Module Two off the standoff and out of the chassis.
4. Disconnect the 100-way ribbon cable (17–02295–02) connecting the
system board with Sync Module One.
5. Loosen the three captive screws holding Sync Module One to the system
board.
6. Lift Sync Module One off the five standoffs and out of the chassis.

Installing the DSH80 Synchronous/Asynchronous Option

3–17

Chapter 4

Advanced Diagnostics
NOTE: Troubleshooting and module replacement is to be done only by
Digital service representatives or by qualified self-maintenance personnel.
To ready the system for booting, you must turn it on, configure the system,
and run diagnostics.

4.1 Power-Up Test
Cable the system to its expansion enclosure( s ) and turn on the system
power. You will see the following:
26..25..24..23..22..21..20..19..18..17..16..15..14..14..14..
13..12..11..10..09..08..07..06..05..04..03..
KN230 V1.x
08-00-2b-17-48-7a
0x10000000
>>

A failure of the DSH80 option (test 40) is displayed as follows:
26..25..24..23..22..21..20..19..18..17..16..15..14..14..14..
13..12..11..10..09..08..07..06..05..
?40 21 ff 0001
P1= 00000040 P2= 00000051 P3= b52ffffd P4= 000000a5 P5= 000000a4
P6= 00000000 P7= 00000000 P8= 00000000 P9= 00000000 P10=00000000
gp= 00800000 sp= a000f794 fp= 00000000 sr= b0480000
epc=bfc2a1e4 badvaddr=00060000 cause=00000000
04..03..
KN230 V1.x
08-00-2b-17-48-7a
0x10000000

Advanced Diagnostics

4–1

4.2 Including the DSH80 in the Environment
Variable Table
For the system to recognize the newly installed option, the iooption
environment variable must be set to 3. The three possible environment
variable notations are as follows:
•

0 = nothing installed

•

1 = DHT80 Asynchronous option installed

•

3 = DSH80 Synchronous/Asynchronous option installed

Run the following console test to see if the iooption is equal to 0x3. The
following example shows iooption=0, meaning no option installed. If you
simply replace a DHT80 option with a DSH80 option, the environment
variable reads 1 until it is changed.
>> printenv
bootp=
bootmode=*
console=0
scsiid=7
systype=0x820c1401
inetaddr=0
baud=9600
baud2=9600
baud3=9600
bitmap=0xa07ff800
bitmapen=0x200
iooption=0

If the iooption is not 0x3, then set the environment variable as follows:
>>setenv iooption 0x3

4–2 DSH80 Option Installation and Owner’s Manual

To verify that the system can see the DSH80 option, enter:
>>conf -f

The following is an example of the output, which shows that the system
now includes the DSH80 option in its environment variable table.
hardware: revision 1OB
firmware: revision 4
cpu: revision 2.32
fpu: revision 3.32
security switch: secure mode
password: clear
eeprom: valid
ethernet hardre address: 08-00-2b-19-28 1d
option board: DSH80 - Sync/Async Option, Vx.x
memory: total size
8MBs
bank0
4 MB
SIMMS size
8MBs
0 bad pages
scsi peripherals
unit type
product
removable/fixed
0
3
5

disk
disk
tape

RZ24
RZ24
TZK10

capacity
200 MBs
200 MBs

NOTE: If the system module is ever replaced, the iooption number will have
to be reentered in the environment variable table.

Advanced Diagnostics

4–3

4.3 Testing Sync and Async Lines Together
To test all of the asynchronous lines and the synchronous lines with no
external loopbacks, simply enter the following command at the >> prompt:
>>test -v 0x40

NOTE: This command tests the asynchronous lines on the DSH80 modules,
but not those on the system board.
If H3199 loopbacks are on the synchronous lines, they will be tested
externally during this test.
The following is the output from a successful test, annotated to tell which
part of the diagnostics tests each of the various components.
16:c0200000:80050000:133c835
-040-08 DSH-80 Sync/Async Option test
***Async lines from here
-040-0b DSH-80 dz ln 00 int lpback rx/tx tst
-040-0c DSH-80 dz ln 00 int lpback sngle ln silo tst
-040-0d DSH-80 dz ln 00 int lpback silo ovrflow tst
-040-0e DSH-80 dz ln 00 int lpback mul line silo tst
-040-0f DSH-80 dz ln 00 silo alarm tst
-040-0b DSH-80 dz ln 01 int lpback rx/tx tst
-040-0c DSH-80 dz ln 01 int lpback sngle ln silo tst
-040-0d DSH-80 dz ln 01 int lpback silo ovrflow tst
-040-0e DSH-80 dz ln 01 int lpback mul line silo tst
-040-0f DSH-80 dz ln 01 silo alarm tst
-040-0b DSH-80 dz ln 02 int lpback rx/tx tst
-040-0c DSH-80 dz ln 02 int lpback sngle ln silo tst
-040-0d DSH-80 dz ln 02 int lpback silo ovrflow tst
-040-0e DSH-80 dz ln 02 int lpback mul line silo tst
-040-0f DSH-80 dz ln 02 silo alarm tst
-040-0b DSH-80 dz ln 03 int lpback rx/tx tst
-040-0c DSH-80 dz ln 03 int lpback sngle ln silo tst
-040-0d DSH-80 dz ln 03 int lpback silo ovrflow tst
-040-0e DSH-80 dz ln 03 int lpback mul line silo tst
-040-0f DSH-80 dz ln 03 silo alarm tst
***Async lines to here
-040-20 DSH-80 Shared RAM Buffer byte tst
-040-23 DSH-80 Shared RAM Buffer word tst
***RAM to here
-040-30 DSH-80 68302 self tst
*Sync lines tested here
-040-50 DSH-80 Dual Access Memory tst
-040-60 DSH-80 Interrupt tst
>>

4–4 DSH80 Option Installation and Owner’s Manual

The following is the output from a failed test; the failure (chn : 0001)
below refers to the upper port, labelled as sync channel 2 on the rear of the
chassis (see Figure 3–15. The error in sync channel 2 could result from a
problem on either Sync Module One or Sync Module Two.
>> test -v 0x40
16:c0200000:80050000:133c835
-040-08 DSH-80 Sync/Async Option test
-040-0b DSH-80 dz ln 00 int lpback rx/tx tst
-040-0c DSH-80 dz ln 00 int lpback sngle ln silo tst
-040-0d DSH-80 dz ln 00 int lpback silo ovrflow tst
-040-0e DSH-80 dz ln 00 int lpback mul line silo tst
-040-0f DSH-80 dz ln 00 silo alarm tst
-040-0b DSH-80 dz ln 01 int lpback rx/tx tst
-040-0c DSH-80 dz ln 01 int lpback sngle ln silo tst
-040-0d DSH-80 dz ln 01 int lpback silo ovrflow tst
-040-0e DSH-80 dz ln 01 int lpback mul line silo tst
-040-0f DSH-80 dz ln 01 silo alarm tst
-040-0b DSH-80 dz ln 02 int lpback rx/tx tst
-040-0c DSH-80 dz ln 02 int lpback sngle ln silo tst
-040-0d DSH-80 dz ln 02 int lpback silo ovrflow tst
-040-0e DSH-80 dz ln 02 int lpback mul line silo tst
-040-0f DSH-80 dz ln 02 silo alarm tst
-040-0b DSH-80 dz ln 03 int lpback rx/tx tst
-040-0c DSH-80 dz ln 03 int lpback sngle ln silo tst
-040-0d DSH-80 dz ln 03 int lpback silo ovrflow tst
-040-0e DSH-80 dz ln 03 int lpback mul line silo tst
-040-0f DSH-80 dz ln 03 silo alarm tst
-040-20 DSH-80 Shared RAM Buffer byte tst
-040-23 DSH-80 Shared RAM Buffer word tst
-040-30 DSH-80 68302 self tst
-040-1f DSH-80 Display Status Block
stat: 00ce - 68302 no carrier detect
---------csr : 001e
sb : 00ce
hwv : 0002
cc1 : 0000
cc2 : 0000
i/e : 0001
chn : 0001
sel : 0001
prot : 0000
ahi : 0002
alo : 8000
size : 0008

swv : 0012
ecnt : 0002
scm : f0cc
exp : 5f00

bps : 0078
act : 0000

DSH-80 - 68302 self test failure - _exp _ret _test
?40 1f ff 0001
P1= 00000040 P2= 00000054 P3= 00000001 P4= 000000ce P5= 0000001e
P6= 00000000 P7= 00000000 P8= 00000000 P9= 00000000 P10=00000000
gp= 00800000 sp= a000c088 fp= 00000000 sr= b0480000
epc=bfc2a1ec badvaddr=00060000 cause= 10000000

Advanced Diagnostics

4–5

4.4 Testing Async Lines Together or Separately
The asynchronous lines can be tested either as a group or as individual
lines.
To test all asynchronous lines only:
>>test -v 0x40 0

The zero at the end of the command means test all the asynchronous lines.
To test individual asynchronous lines:
To test one asynchronous line, specify whether to test it internally or
externally. Use Table 3–1 to identify the line number for the MMJ port
you want to test. Use the following command:
>>test -v 0x40 0 [0=internal/1=external] [line no.]

The H3103 loopbacks (12–25083–01) are used for external loopback testing.
The following example shows the output of a successful external test of line
3 (MMJ7):
>> test -v 0x40 0 1 3
-040-0b dz ln 03 ext rx/tx lpback tst
-040-0c dz ln 03 ext sngle ln silo tst
-040-0d dz ln 03 ext silo ovrflow tst
-040-0e dz ln 03 ext mul line silo tst
-040-0f dz ln 03 silo alarm tst
>>

If a failure is detected in an asynchronous line, replace Sync Module One
and retest.

4–6 DSH80 Option Installation and Owner’s Manual

4.5 Testing the Sync Lines
The synchronous lines can also be tested by internal or external loopback.
To test the internal loopback, enter the following command:
>>test -v 0x40 2

To test the sync lines externally, put H3199 loopbacks on the sync lines (one
or both) and enter the following:
>>test -v 0x40 2

The loopback will be detected by the diagnostics.
The following is an example of a successful test:
>> test -v 0x40 2
16:c0200000:80050000:133c835
-040-08 DSH-80 Sync/Async Option test
-040-30 DSH-80 68302 self tst
>>

The following is an example of a failed test:
>> test -v 0x40 2
16:c0200000:80050000:133c835
-040-08 DSH-80 Sync/Async Option test
-040-30 DSH-80 68302 self tst
-040-1f DSH-80 Display Status Block
stat: 00ce - 68302 no carrier detect
---------csr : 001e
sb : 00ce
hwv : 0002
cc1 : 0000
cc2 : 0000
i/e : 0001
chn : 0001
sel : 0001
prot : 0000
ahi : 0002
alo : 8000
size : 0008

swv : 0012
ecnt : 0002
scm : f0cc
exp : 5f00

bps : 0078
act : 0000

DSH-80 - 68302 self test failure - _exp _ret _test
?40 1f ff 0003
P1= 00000040 P2= 00000054 P3= 00000001 P4= 000000ce P5= 0000001e
P6= 00000000 P7= 00000000 P8= 00000000 P9= 00000000 P10=00000000
gp= 00800000 sp= a000c088 fp= 00000000 sr= b0480000
epc=bfc2a1ec badvaddr=00060000 cause= 10000000
>>

Advanced Diagnostics

4–7

Appendix A

Field-Replaceable Units for the DSH80
Synchronous/Asynchronous Option
Table A–1: FRUs for the DSH80 Option
Unit

Part Number

Sync module one

54–20472–01

Sync module two

54–20874–01

Ribbon cable (50-way)

17–01243–04

Ribbon cable (100-way)

17–02295–02

Lower blank cover plate

74–41591–01

Upper blank cover plate

74–38986–01

Standoff

12–21566–05

Async loopback (H3103)

12–25083–01

Sync loopback (H3199)

12–25852–01

Label (1), async lines 0-3

36–33715–03

Labels (2), sync lines 1 and 2

36–35733–01

Field-Replaceable Units for the DSH80 Synchronous/Asynchronous Option

A–1

Appendix B

Cable Lengths and Order Numbers
B.1 Distance Specifications for Cables
Table B–1 lists protocol standards, their data rates, and the recommended
cable length.

Table B–1: Maximum Communication Distances
Protocol

Data Rate (kbits/s)

Cable Length

EIA–232–E/V.24/V.28

Up to 20

15 m (50 ft)

EIA–423–A

Below 1
20
48
64

1200 m (3900 ft)
400 m (1300 ft)
150 m (500 ft)
130 m (400 ft)

EIA–422–A

Below 90

120 m (3900 ft)

V.35

60 m (200 ft)

Table B–1 assumes the following capacitance and length:
•

V.24 cable capacitance is 50 pF/ft.

•

EIA–423–A cable capacitance is 15 pF/ft.

•

EIA–422–A cable capacitance is 15 pF/ft, terminated with 100 ohms.

•

V.35 maximum length (60 m) is a recommended figure only.

Cable Lengths and Order Numbers

B–1

Table B–2: Cables for Customer Ordering
Cable

Part Number1

DEC office cable, 6-wire

BC16E

Extension cable for BC19E–02 (EIA–423/V.36)

BC55D–xx

Extension cable for BC19F–02 (V.35)

BC19L–xx

Extension cable for BC19D–02 or BC23V–02

BC22F–xx

Extension cable for BC19B–02 (EIA–422)

BC55D–xx

Loopback for universal 50-pin

H3199

Loopback for EIA–423, EIA–422

H3198

Loopback for V.35

H3250

Loopback for 25-pin D-sub connector

H3248

Loopback for 25-pin D-sub connector

H3266

Loopback for async MMJ connectors

H3103

Modem cable, 25-wire, fully-shielded EIA–232–C/V.28

BC22F–yy

Null modem, 6-wire, fully-shielded EIA–232–C/V.28

BC22D–yy

Null modem, 10-wire, fully-shielded EIA–232–C/V.28

BC17D–yy

Sync line adapter cable for EIA–422–A/V.11

BC19B–02

Sync line adapter cable for EIA–423–A/V.10

BC19E–02

Sync line adapter cable for V.35

BC19F–02

Sync line adapter cable for EIA–232–E/V.24

BC19D–02, BS19D–022

Sync line adapter cable for EIA–232–E/V.24

BC23V–02, BS23V–023

1 xx and yy represent one of the following:

10: 10 ft (3.1 m) (xx)
25: 25 ft (7.6 m) (xx, yy)
35: 35 ft (10.7 m) (yy)
50: 50 ft (15.2 m) (xx, yy)
75: 75 ft (22.9 m) (xx, yy)
A0: 100 ft (30.5 m) (xx)
2 Includes BC19D–02 and 12–27591–01 adapter.
3 Includes BC23V–02 and 12–27591–01 adapter.

B–2 DSH80 Option Installation and Owner’s Manual

Appendix C

Connectors, Cables, and Loopbacks
D-sub connectors are for synchronous ports and MMJ connectors are for
asynchronous ports.

C.1 Synchronous (D-Sub) Connectors
Use the 50-pin D-sub connector (port 1) to connect devices that support any
of the following standards:
•

EIA–232–E/V.24/V.28

•

EIA–423–A, EIA–449/V.10, V.36

•

EIA–422–A, EIA–449/V.11, V.36

•

V.35

Table C–2 shows the pinouts for the D-sub connector.

C.2 Asynchronous (MMJ) Connectors
The MMJ connectors each have the pin numbers and signals as shown in
Table C–1.

Table C–1: MMJ Connectors
Pin

Signal Name

Tied to Vcc by 150-ohm resistor

Txdata

Txcommon

Rxcommon

Rxdata

Tied to GND by 3K-ohm resistor

Connectors, Cables, and Loopbacks

C–1

Table C–2: D-Sub Full Function Connector Pinouts
50-Way

Signal

V.35

232–E

422–A

423–A

Null

Name

Modem

Code ground

†

Code 0

†

Code 1

†

Code 2

Code 3

TX Data A

TX Data B

TX Data

RTX/CA

RTS/CB

RX Data A

RX Data B

Local Loop

Speed Indicate

Test I

Rem Loop

RX Clock A

8,20,47

RX Clock B

‡

26,21,48

TX Clock A

5, 18

TX Clock B

‡

23,19

Clock

V.35 TX Clock A

V.35 TX Clock B

V.35 Clock A

†
†

†

†Connected to DCE ground (pin 41)
‡Connected to Code ground (pin 1); Code ground does not run down the cable; on null modem
cable each end has code signals

C–2 DSH80 Option Installation and Owner’s Manual

Table C–2 (Cont.): D-Sub Full Function Connector Pinouts
50-Way

Signal

V.35

232–E

422–A

423–A

Null

Name

Modem

V.35 Clock B

V.35 RX Data A

V.35 RX Data B

V.35 TX Data A

V.35 TX Data B

V.35 RX Clock A

V.35 RX Clock B

DTR

DSR A

DSR B

‡

RTS

DCD/I A

DCD/I B

‡

CTS A

CTS B

‡

DCE Ground

‡

TEST1

TEST2

DTE Ground

B‡

7‡

19,37

19, 22,25,
30,35,37

DTR A

DTR B

Clock A

Clock B

TEST3

Speed Select

12
11

29
7

‡Connected to Code ground (pin 1); Code ground does not run down the cable; on null modem
cable each end has code signals

Connectors, Cables, and Loopbacks

C–3

C.3 Synchronous Line Adapter Cables
The following synchronous line adapter cables are used:
BC19B–02 (EIA–422–A/V.11)
For connection of the DECsystem 5100 to EIA–422–A devices. The BC19B–
02 is a 28-wire cable with a 50-pin connector at one end and a 37-pin
connector at the other.
BC19D–02 (EIA–232–E/V.24)
For connection of the DECsystem 5100 to EIA–232–E or V.24 devices. The
BC19D–02 is a 15-wire cable with a 50-pin connector at one end and a
25-pin connector at the other. Cable BC19D–02 is similar to BC23V–02.
BC19E–02 (EIA–423–A/V.10)
For connection of the DECsystem 5100 to EIA–423–A devices. The BC19E–
02 is a 24-wire cable with a 50-pin connector at one end and a 37-pin
connector at the other.
BC19F–02 (V.35)
For connection of the DECsystem 5100 to V.35 devices. The BC19F–02 is
a 16-wire cable with a 50-pin connector at one end and a 34-pin connector
at the other.
BC23V–02 (EIA–232–E/V.24)
For connection of the DECsystem 5100 to V.24 devices. The BC23V–02 is
a 16-wire cable with a 50-pin connector at one end and a 25-pin connector
at the other. Cable BC23V–02 is similar to the BC19D–02.
V.24/EIA–232–C Adapter (12–27591–01)
For converting the 25-pin D-sub connectors to EIA–232–C format.

C.4 Asynchronous Line Adapter Cable
BC16E–xx
For connection to a terminal asynchronous port. The BC16E is an
unshielded, 6-conductor flat cable terminated at both ends with an MMP.

C–4 DSH80 Option Installation and Owner’s Manual

C.5 Extension Cables
Use the cables in Table C–3 with the line adapter cables.

Table C–3: Synchronous Line Extension Cables
Type

Description

BC55D–xx

Extends BC19B–02 adapter cable (EIA–422)

BC22F–yy

Extends BC19D–02 or BC23V–02 adapter cable (V.24)

BC55D–xx

Extends BC19E–02 adapter cable (EIA–423–A)

BC19L–xx

Extends BC19F–02 adapter cable (V.35)

C.6 Synchronous Loopbacks
H3199 Total Loopback
For testing 50-pin D-sub connector driver and receiver circuits.
H3198 (EIA–422–A/EIA–423–A)
For testing EIA–422–A and EIA–423–A interfaces on the 50-pin D-sub
connector, as well as the EIA–422–A and EIA–423–A adapter cables.
H3250 (V.35)
For testing the V.35 interface on the 50-pin D-sub connector and the
BC19F–02 adapter cable.
H3248 (EIA–232–D/V.24)
The H3248, a 25-pin loopback similar to the H3266, is used to loop back
EIA–232–E/V.24 cables.
H3266 (EIA–232–E/V.24)
This loops back the 25-pin D-sub connector and the BC22F cable. The
H3266 is a 25-pin loopback similar to the H3248.

C.7 Asynchronous Loopback
H3103 MMJ Loopback Connector
To loop signals back on the asynchronous (MMJ) ports.

Connectors, Cables, and Loopbacks

C–5

Appendix D

United Kingdom Specifications
This appendix is for use with Digital’s DSH80 option in the United
Kingdom, and meets the requirements of BABT/SITS/89/43 Section 7.1.

D.1 Service Category Specifications
Table D–1 lists the service categories (SC) and their specifications.

Table D–1: Specifications for Service Categories (SC) 1 and 2
Baud

PTO:1

Interface

Rates Physical

Electrical

Hull

MCL

CCITT
recommend
X.21bis

2400
4800
9600
19 200

ISO 2110
BS.6623:
Part 1 1985

V.242 /V.28
Cable:
BC19D–02
BC22F–25

Yes
Yes
Yes

Yes
Yes
Yes
Yes

CCITT
recommend
X.21bis

48 000
56 000
64 000

ISO 2593
BS.6623:
Part 4 1986

V.353
Cable:
BC19F–02
BC19L–25

Yes
Yes

Yes

Yes
Yes
Yes

1 BT = British Telecommunications plc; Hull = Kingston Communications (Hull) plc; MCL =
Mercury Communications Ltd
2 2 ft for adapter cable BC19D–02; 25 ft for extension BC22F–25
3 2 ft for adapter cable BC19F–02; 25 ft for extension BC19L–25

D.2 Direct Connection (BABT/SITS/89/43 Section
4.2)
The DSH80 option is approved for direct connection to a particular digital
circuit, including interconnecting cables with mating connectors conforming
to BS.6623 part 1 and part 4.

United Kingdom Specifications

D–1

D.3 Apparatus Between DECsystem 5100 and
Digital Circuit (PTT)
If any other apparatus, including cable or wiring, is to be connected between
the DECsystem 5100 and the point of connection to any particular digital
circuit, then all the other apparatuses shall conform as follows:
1. The overall transmission characteristics of all other apparatuses shall
introduce no material effect upon the electrical conditions presented to
one another by an apparatus and a digital circuit.
2. All the other apparatus shall comprise only:
•

Apparatuses approved (such apparatuses may be subject to
limitations on their use) for the purpose of connection between the
apparatus and a particular digital circuit.

•

Cable or wiring complying with code of practice for installation
of apparatuses covered by the standard or other applicable
requirements.

D.4 Safety Warning for UK Installations
The DSH80 option has a label regarding safety requirements of
communications modules installed in the United Kingdom. The label states:
SAFETY WARNING. See instructions for use

The following warning applies in the UK:
CAUTION: The port indicated by the safety label is not intended to provide
electrical and mechanical isolation to satisfy the requirements of BS6301.
Connect only apparatus conforming with BS6301 to the device ports, or
apparatus that has previously been evaluated against British Telecom
Technical Guides 2 or 26 and given clearance to attach. Other usage will
invalidate any approval given to this apparatus.
Connecting apparatuses to which this warning applies, whether the ports
are so marked, may produce hazardous conditions on the network. Seek
advice from a competent engineer before making any such connection.
Products complying with the Oftel’s General Approval NS/G/23/J/1000003
may be connected to the DECsystem 5100 and need not carry the BS6301
warning text or label. All products supplied by Digital comply with
the General Approval.

D–2 DSH80 Option Installation and Owner’s Manual