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Document:	DELNI ETHERNET Local Network Interconnect Technical Manual
Order Number:	EK-DELNI-TM
Revision:	0Z1
Pages:	58
Original Filename:

OCR Text

DELNI ETHERNET

Local Network
Interconnect
Technical Manual
EK-DELNI-TM.001

EK-DELNI-TM-001

Networks ¢ Communicatio

DELNI
Ethernet Local
Network Interconnect
Technical Manual

Digital Equipment Corporation

1st Edition, July 1984

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 DECset Integrated Publishing System.

The following are trademarks of Digital Equipment Corporation:

DEREP
DEUNA

Rainbow
RSTS

DIGITAL

RSX

DECmate
DECnet

ETHERJACK
LA

UNIBUS
VAX

DECUS
DECwriter
DELNI

MASSBUS
PDP
P/OS

VMS
VT

Professional

Work Processor

Page

PREFACE

fo——

DIGITAL ETHERNET LOCAL NETWORK INTERCONNECT (DELNI)
OVERVIEW ..ttt
e e e e amas e e e e e e e saas e eeee e e e aeeiibateeeanes 1-1
Communication IfiterfacesU P POPUP ORIRP R L.
Operating Mades/();seratzanal Communication Interfaces..............o..cooovvoovvvn. 1-2
Operational APPHCAtIONS ......ccviiiueeiiieiireeecieereeereeesieereeeeaeeeeraeesseeeeseeeeieenenenses 172
DELNI FUNCTIONAL DESCRIPTION §§§§§§§ 1-3
LOCAL Mode OPeration......ccouceeeueeiciieeriireriiieeeiieeineeasiesesinseesinesscrsessiessssneess 173
GLOBAL Mode Operation..................BSOS
PSTRR
OO 1-3
Physical CharacteriStiCs.
... .covvuierirveeeiieeeeiiereieeeireesieeesineesneeesieeecinesisnesiensees 124
CONFIZUIALIONS...veiiiviiiiiieie it e cciieeeeetne e ceieeesiseeesesseeeeraeessnseeesinnneesssnesseeceneens 178
DELNI CONTROLS, INDICATORS AND FUSING et eererernreneeeeeeneeennrinneaeens 170
CONLrols ANd INAICAIOTS ...veveveeeeeeeeeeeeeeeeeeeeeeeee
e
see e s seseenas 1-6
FUSINE ..ot e e e et e e e e s e ssenaeeeeeeaeseeennenseaeens
170

Spare Fuses and FflSfi Ha}dérs ****** crereerieieen 156

Losd
Pud b

INTRODUCTION

DELNI RACK MOUNT OPTION ...e 16

TR IR A

W B

CHAPTER 1

RELATED DOCUMENTATION ...rvvrrreeeeen 159

tad
g ree

e
e

B B2 B RO B

DELNI NETWORK CONFIGURATION GUIDELINES
CONFIGURATION GUIDELINES ...t
reeccssncninenanns 271
Standalone DELNI LAN.........cccccoee.censvsenrrensesereivrnans rreeerenanseeerreeeiinnnenns 201
Two-Tier DELNI LAN ...,ettt
———————— 2-1
Connected DELNI LAN ..ot eeeneaees 271
CONFIGURATION LIMITATIONS
. ... .ot
eere s e s secenaese
e 2-1

DELNI INTERFACES, INPUT/OUTPUT SIGNAL FLOW, AND

COMMUNICATION INTERFACES.........cooiiiieceieeenerrrerereereereeneneenees 371
Local Connector INterfaces.......oovvvvvviieiiiiiieeiieeeeeceeeerere e 3-1
Global Connector Interfaces
..
SRR RURUURURORTRRPRRSRRRRPRRRRRC T |
O

INPUT/OUTPUT SIGNAL FLOW AND TIMING RELATIGNSHIPS************* 3-3

L b Ll b =

W wwwwwiow

SPECIFICATIONS

LOCAL Mode Signal Flow and Timing Relationships .........ccccccoovrenene.eeeene 3°3
GLOBAL Mode Signal Flow and Timing Relationships........c.ccccconcveviiiiiienn. 323
INPUT/OUTPUT CIRCUIT AND SIGNAL CHARACTERISTICS .................. 3-8
CHn TRANSMIT Pair Signal Requirements.........c.ccccocvvveinneciennnne. e 3-8
CHn TRANSMIT Pair Circuit Response ...............
rvasorsanes
ceeeeerenne. 3-8
CHn RECEIVE Pair Circuit Characteristics ..........ccoveeiiiirreeevereererinerensreneenee 3=9
CHn RECEIVE Pair Signal CharacteristiCs .........cccceevveeirerverinerenneeeinecriciiees. 329
CHn COLLISION PRESENCE Pair Circuit ChafactenstzcsH,,,,,Www ****** 3-10

CONTENTS (Cont)

O
e

L
#
#®

CHn COLLISION PRESENCE Pair Signal Characteristics............ v 3-10
XCVR TRANSMIT Pair Circuit Characteristics...........occvvvveevveeeeeririrninnn, 3-11
XCVR TRANSMIT Pair Signal Characteristics ........oocvvevveviveereveeerreiniiinnnn, 3-11
XCVR RECEIVE Pair Signal Requirements ..........cccooveivvvvieeoeeeeeeiinernnnn, 312
XCVR RECEIVE Pair Circuit ReSponse ............ccooovveeiieeoeeeeeis e, 3-12
XCVR COLLISION PRESENCE Pair Signal Reqmremefiig“mmm”m” ,,,,, 3-13
XCVR COLLISION PRESENCE Pair Circuit Response............c..cocveevennn. 3-13
XCVR POWER Pair Characteristics......... U PUPPUPPPRURRRRPPPPPPRC I "
XCVR POWER Pair External Load Reqniremsfiism,*.m;z.,,,.m,mmm
,,,,,,,, 3-15
INPUT POWER REQUIREMENTS .. e 3-15

CHAPTER 4

'FUNCTIONAL THEORY OF OPERATION

OO
e
B

B
R

D 00 w3 ON L g

il ol ol ol e

ha n el el

e e

ENVIRONMENTAL REQLIREMENTS.,.“w,,mmmm,m” §§§§§§§§§§e. 3-16

0 B

$a Lo B

e W W W W W

Page

4.2.2.1
42272
4223

4224

Local/Global Heartbeat and Collision Szgfighng C@gtrgl,,m_mmgmwm, ,,,,,,,,, 4-4

10 MHz Oscillator ...........et SO
PPRO RO PP RUUUPPRRRRRYGlobal XMIT Data Substztmfi ,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,, 4-5

Global Connector INterface..........oovvviioiieieeeeee
e 4-5
DELNI FUNCTIONAL CPERATION ,,,,,, ceeeeeen. 46
LOCAL Mode Functional Theory.......coooouvioiiiiiiiiiiceceeeeeeeeeeeee
e 426
Transmit/Receive ......... TP
UUUPOPURURRRRRRPPRP o
Local Heartbeat Signakfig 4-6
Local Collision Detection..........ccocooiiiiiiiiiiiieeeee e,.4-7
Local Collision Signaling ..........ccooiiiiiiiiiiiiiiiiccce e 4-7

GLOBAL Mode Functional TREOTY .....vvveveoveeoeeeeeeeeoeeoeeoeeoeoeeoeooo) 4-8
TTaANSINIL oo
ettt 4-8
Local Collision fietectzf}r}m.,,,w,
,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,. 4-8
Local Collision Condition Data Control and Calhszzsn Szgzzaimg ,,,,,,,,,,,,,, 4-9
RECEIVE ...
e, 4-10
Global Collision 3§é Heartbeat Szgfia} Detection............cccooeevvveveneennnn.. 4-10
Global CGHiSiGE and Heartbeat Signaling .......cccccooevviiiiiieiiiiiiieeee 4-11

‘MODULE REMOVAL AND REPLACEMENT INSTRUCTIONS
LOGIC MODULE REMOVAL PROCEDURE .........ovoooooooooooooooo
2]
CONNECTOR BOARD REMOVAL PROCEDURE ......oooooooeeioeoeeoeee5 1
CONNECTOR BOARD INSTALLATION PROCEDURE .......coocoovevvvevn. 5-4
LOGIC. MODULE INSTALLATION PROCEDURE..........cccccccooovecvrnnc. 54

B
DI

CHAPTER 5
h
h bn

4.2.2.5
4.2.2.6

DELNI CIRCUIT CHARACTERISTICS ..., e
4]
POWET SUPPLY oot
A
Operating Mode Control........coooooviiiiiiiiiiieeceeceee B UUUTTRRRRRT 4-3
Local Connector Interfaces ........coovvviiiiie
e 4-3
Data ConCeNtIator
. ....uuiiiiieiceeciiee
e
e e B3
Data Router.......oooovvvvviiiiiiiieecceeeee, ettt e
e
eiinee e 423
Data Presence and Local Collision Dezficiar PSPPI
-&
Data Enable/Local Collision Control ..........ovveeveeeeeee ... 4-4
Local Heartbeat Timers.........ettt ST 4-4

FIGURES

&b e
'WWWMWMWW
O

Title

Page

Digital Ethernet Local Network Interconnect (DELNI) ... 1-1
DELNI Controls and INAICATOTS. .. ....oeevvevviieieeeerecrseserseseseeseseseesesssssesssnssnssnnsesaess 177
C@fifzgzzratzéfi Guidelines and Limitations: Standalone DELNI LAN ..................... 2-2
Configuration Guidelines and Limitations: Two-Tier DELNI LAN.........ccooooe. 2-3
Configuration Guidelines and Limitations: Connected DELNI LAN........c.ccccoeies 2-4
LOCAL Mode Signal Flow D‘xagram 3-4
LOCAL Mode Signal Timing Diagram........ etee —a e r e teanteeteaenbeenraaenaaeeaeeeies 37D
........c.ccocccoerericiimiinmmmmimesemsesesensssmeinseneaees 370
GLOBAL Mode Signal Flow DIagram
GLOBAL Mode Signal Timing Diagram ..o, eeererrreeeennn 3-7
eereiee 422
DELNI Functional Block Diagram ........cccccoiiiviiiiiiiimimninnecceii
RPRON 5-2
SSUTURURIURUPP
DELNI Plastic Case Removal .........ccocooiiiiiiiiiiniininiie
s 5-3
DELNI EXPloded VIEW...c.oiviiiiiiiiiiirinniinesieeiisne
TABLES
Title

Page

DELNI Country Kits .....ooooiiiiiiiiiniiiiiinn, rrreeereeereeeniaas trrrerer et ceeen 125
Controls and INAICALOTS ...eveeeiiciiiiiierieiieereeereeesierereeaseeetersereaeeeeeraererarrareatitacciiatiettaaanan. 1-8
Related Documentation....... revtnsbeserensnencasensreriisntesibsainenrruarTaRsisessrssaissansssseasaseeereressass 1-9
e eaanseeer 3-2
Local Connector Signal Line Interfacesg o eeerenrees et eet e na e ee bt
3-2
RRI
innn.NS
.ccooiiii
Global Connector Signal Line Interfaces........

This manual describes the physical, electrical, and functional characteristics of the DIGITAL Ethernet
Local Network Interconnect (DELNI). This document is intended to provide the Field Service Engineer
with a working knowledge of the DELNI unit.

vii

CHAPTER 1

1.1 DIGITAL ETHERNET LOCAL NETWORK INTERCONNECT (DELNI) OVERVIEW
The DELNI unit (Figure 1-1) 1s a hardware communications device. The DELNI unit and associated
cables can be used to create several types of Local Area Networks (LANs) through which Ethernet
Compatible Stations (Stations) may communicate using the DIGITAL Ethernet Carrier Sense Multiple
Access/Collision Detect (CSMA /CD) protocol.

LOCAL
CONNECTORS

GLOBAL
CONNECTOR
MKV84-1035

Figure 1-1

Dagital Ethernet Local Network Interconnect (DELNI)

1.1.1 Communication Interfaces
The DELNI unit provides nine communication interfaces. These are:

Eight (8) local connectors (labeled 1 through 8 on the front panel), and

One (1) global connector (labeled [J on the front panel).

Each of the eight local connectors have the following paired signal line interfaces.

e
e
e

TRANSMIT
RECEIVE
COLLISION PRESENCE

The global connector has the following paired signal line interfaces.

TRANSMIT
RECEIVE
COLLISION PRESENCE
POWER (+12 V and +12 V return)

1.1.2 Operating Modes/Operational Communication Interfaces
The DELNI unit has two selectable modes of operation: LOCAL and GLOBAL.
In the LOCAL mode of operation, all communication interfaces with the DELNI unit are by way of the
local connectors.

In the GLOBAL mode of Gp@?‘fiiii}fig the communication interfaces with the DELNI unit are through both
the local and global connectors.

1.1.3 Operational Applications
The DELNI unit and associated cables may be used to create the following types of Local Area Networks
(LANS).
e

Standalone DELNI LAN - Network through which up to 8 stations can communicate.

Two-Tier DELNI LAN - Network through which up to 64 stations can communicate.

Connected DELNI LAN - Network through which up to 8 stations can communicate on a
larger Ethernet network through a single Ethernet transceiver interface.
NOTE
Refer to Ethernet Installation Guide for detailed
configuration requirements. General configuration
requirements are provided in Chapter 2 of this
document.

The functional operation of the DELNI unit is dependent on the mode of operation selected: LOCAL or
GLOBAL.
1.2.1

LOCAL Mode Operation

In the LOCAL mode, the DELNI unit performs the following functions.
TM

Transmit/Receive - Provides the data paths between the TRANSMIT and RECEIVE pairs of
the local connectors.

Heartbeat Signaling - Provides signaling on the COLLISION PRESENCE pairs of the local
connectors after the end of each transmission interval.
Collision Detection - Detects the condition in which two or more stations are attempting to
transmit simultaneously.

Collision Signaling — Provides signaling on the COLLISION PRESENCE pairs of the local
connectors when a collision is detected.

1.2.2 GLOBAL Mode Operation
In the GLOBAL mode, the DELNI unit performs the following functions.
L

Transmit Provides a data path from the TRANSMIT pairs of the local connectors to the
TRANSMIT pair of the global connector. It is through this data path that stations connected to
the local connectors can send data to a global network device for transmission on a larger
Ethernet network.

Local Collision Detection — Detects the condition in which two or more stations connected to the
local connectors are attempting to transmit simultaneously.

Local Collision Condition Data Control and Collision Signaling - During a local collision
condition, controls the data sent to the global network device. This ensures that the duty cyle
and minimum packet length requirements are not violated. Also, provides signaling on the
COLLISION PRESENCE pairs of the local connectors.

Receive - Provides a data path from the RECEIVE pair of the global connector to the
RECEIVE pairs of the local connectors. This data path distributes the data received from a
global network device to the stations connected to the local connectors.
Global Collision and Heartbeat Signal Detection — Detects the presence of signals asserted on
the COLLISION PRESENCE pair of the global connector.

Global Collision and Heartbeat Signaling - Provides signaling on the COLLISION PRESENCE pairs of the local connectors whenever a signal is detected on the COLLISION PRESENCE pair of the global connector.

1.3

DELNI PHYSICAL DESCRIPTION

1.3.1 Physical Characteristics
The dimensions and weight of the DELNI unit (both with and without the plastic housing) are:
With Plastic Housing

Without Plastic Housing

Width

19.25 in (48.9 cm)

17.50 in (44.5 ¢cm)

Depth

7.75in (19.7 cm)

7.00 in (17.8 cm)

Height

3.50 in (8.9 cm)

2.50 in (6.4 cm)

Weight

10.5 Ibs (4.8 kg)

1.3.2 Configurations
There are two configurations of the DELNI unit: DELNI-AA configuration for U.S. applications and
DELNI-AB configuration for European/GIA applications. The differences between the two configurations are:
DELNI-AA (US)

3AG, 0.5 A, Slo-Blo fuse and 1/4 inch fuse carrier installed
The 120/240 switch is preset to the 120 position
Installation/owner’s manual

AC power cord

DELNI-AB (European/GIA)
-

5x20mm, T, 0.5 A fuse and 5 mm fuse carrier installed
The 120/240 switch is preset to the 240 position

No ac power cord or installation/owner’s manual is
shipped with the DELNI-AB configuration. A coun-

try kit (containing a power cord and installation/owner’s manual) must be ordered separately.
Table 1-1 lists the country Kits available.

1-4

Table 1-1
Order Designation

DELNI Country Kits
Primary Country
Belgium

Canada - France
Denmark

United Kingdom
Finland

Germany
DELNK-AH

Holland
Italy

DELNK-AK

Switzerland - France

Switzerland - Germany
Sweden
DELNK-AN

Norway

DELNK-AP

France

DELNK-AQ

Canada - England

DELNK-AS

Spain

DELNK-AZ

Australia

The location of the controls, indicators, and fuse of the DELNI unit are shown in Figure 1-2.
1.4.1 Controls and Indicators
|
|
Table 1-2 describes each of the controls and indicators and specifies their function.
1.4.2 Fusing
The DELNI unit is fused as follows:

.
L

DELNI-AA
DELNI-AB

3AG, 0.5 A, Slo-Blo
S5X20mm, T, 05 A

1.4.3 Spare Fuses And Fuse Holders
Spare fuses and fuse holders may be ordered separately.
5% 20 mm, T, 0.5 A fuse (DIGITAL P/N 12-19283-19)
5 mm fuse carrier (DIGITAL P/N 12-21126-04)
3AG, 0.5 A, Slo-Blo fuse (DIGITAL P/N 90-07209-00)
1/4 inch fuse carrier (DIGITAL P/N 12-21126-03)

The DELNI unit may be mounted in a standard 19 inch (48.26 ¢m) rack using the DEXRM rack mount
%
assembly.

OPERATNG MODE
SELECTOR SWITCH

AC INPUT
VOLTAGE SWITCH
GLOBAL
MODE

120 Vac
POSITION

LOCAL
MODE

240 Vac
POSITION

POWER SUPPLY ~~
INDICATOR

MKVB4-1036

Figure 1-2

DELNI Controls and Indicators
1-7

Table 1-2

Control/Indicator
(Type)

Controls and Indicators

Function

(Two-position slide switch)

Selects GLOBAL mode of operation,

Selects LOCAL mode of operation.

(Green LED)

POWER SUPPLY INDICATOR
Lights to indicate operational status of the +5 Vdc
power supply within the DELNI unit.

120/240 (Two-position slide
switch)
|

AC INPUT VOLTAGE SWITCH

120

Makes DELNI unit compatable with 90-128 Vac
Input power source.

240

Makes DELNI unit compatable with 180-256 Vac
input power source.

Other documents relative to the DELNI unit and associated Ethernet networks are specified in Table 1-3.
Table 1-3
Title

Order Number

DELNI Field
Maintenance Print
Set

MP-01656-**

Related Documentation
Description

Unit assembly drawings, parts listing,
and schematic diagrams.

EK-DELNI-IN-**

Outlines Ethernet networking configurations which can be developed using the
DELNI unit. Also provides installation
instructions, troubleshooting information,
and a description of service options.

Introduction to
Local Area Networks

EB-22714-18

Describes the terms, concepts, designs,
and strategies related to local area

The Ethernet, A

AA-K759A-TK

Ethernet

EK-ETHER-IN-***

2 Volumes:
Volume 1; Detailed Site Planning
Information.
Volume 2: Detailed Installation
Instructions.

EK-DEXRM-IN-***

Provides the procedural information for
installing the DELNI unit in a standard
48.26 cm (19 in) equipment rack using the
DEXRM rackmount option.

DELNI Installation/
Owner’'s Manual

Local Area
Network, Data Link
Layer and Physical
Layer Specification

networks.

Precisely describes the design constraints

and functional requirements for
components to be used in the Ethernet
environment. Also discusses the protocol
to be used for communication on the
Ethernet.

Installation Guide

DELNI Rackmount

Option Installation

Guide

DELNI Hlustrated
Parts Breakdown

EK-DELNI-IP-**

Identifies components of the DELNI unit
using annotated drawings keyed to parts
listings.

** /*** The latest revision is sent if no revision is specified.
.

CHAPTER 2

CONFIGURATION GUIDELINES

Basic configuration guidelines for three DELNI LAN Ethernet environments (standalone DELNI LAN,
Two-Tier DELNI LAN, and Connected DELNI LAN) are outlined in the following sections and Figures
2-1 through 2-3. Restrictions regarding the length of cables that may be used are defined in Section 2.2.
2.1.1 Standalone DELNI LAN
In a Standalone DELNI LAN application (Figure 2-1), all stations are interconnected by way of a single
DELNTI unit. All station interfaces to the DELNI unit are through the local connectors and the DELNI
unit is operated in the LOCAL mode.
2.1.2 Two-Tier DELNI LAN
In a Two-Tier DELNI LAN application (Figure 2-2), there may be as many as nine DELNI units with one
DELNI unit operating in the LOCAL mode and up to eight DELNI units operating in the GLOBAL
mode. The interfaces between stations and DELNI units of a typical Two-Tier DELNI LAN are as
follows.
e

All station interfaces to the DELNI units are through the local connectors.

The global connector of each DELNI unit operating in the GLOBAL mode is connected to the
local connector of the DELNI unit operating in the LOCAL mode.

2.1.3 Connected DELNI LAN
In a Connected DELNI LAN application (Figure 2-3), the stations are connected to the local connectors
of a single DELNI unit operating in the GLOBAL mode. The global connector of the DELNI unit is
connected to an Ethernet transceiver.

The primary configuration limitations are due to the maximum length of transceiver cable that can be
used to interconnect the stations and DELNI units. The maximum length of transceiver cable that may be
used 1s dependent on the following parameters.
e
e

Type of transceiver cable used.
Type of Ethernet communications controller installed in the station.

DELNI LAN configuration.

Figures 2-1 through 2-3 outline the maximum cable lengths for three DELNI LAN configurations. Each
figure shows the restrictions associated with several types of Ethernet communications controllers and for
two types of transceiver cables.
Transceiver Cable Types

Two types of transceiver cables are as follows.
e
e

BNE3X-XX - Transceiver cable
BNE4X-XX - Office transceiver cable

2-1

These cables have different electrical signal attenuation characteristics. The cable length restrictions
called out in Figures 2-1 through 2-3 assume that only one type of cable is used in each cabling run (that s,
the attenuation characteristics are constant). If the two cable types are connected together to effect any
one of the cabling connections, the maximum cable length allowable may be calculated using the following
relationship.

The attenuation of a 2 m length of BNE4X-XX cable is equivalent to the attenuation of an § m
length of BNE3X-XX cable.

STATION

BNE3X-XX

CONTROLLER
TYPE:

BNE4AX-XX

40M

10M
et Bl

DEUNA

DELNI

STATION

CONTROLLER |
|

(LOCAL MODE)

BNE3X-XX

50M

BNE3X-XX

45M

BNE4X-XX

125M

DEQNA

STATION

CONTROLLER | BNE4X-XX

TYPE:

11.25M

DECNA

LEGEND
**

| OCAL CONNECTOR

GLOBAL CONNECTOR

NOTE

THE DIFFERENCES IN CABLE LENGTHS
SPECIFIED FOR USE WITH EACH TYPE
CONTROLLER ARE DUE TO THE LENGTHS
AND TYPE OF CABLING WHICH IS A PART OF
EACH CONTROLLER.
MKV84-1024

Figure 2-1

Configuration Guidelines and Limitations: Standalone DELNI LAN

STATION
o

BNE3X-XX

CONTROLLER |

40M

BNE4X-XX

TYPE:

10M

BNE3X-XX

o TRA

BNE4X-XX

50M

12.5M

SRR

DEUNA

STATION

CONTROLLER |
. TYPE:
DEQNA

BNE3X-XX

DELNI

(GLOBAL MODE)

(LOCAL MODE)

50M

BNE4X-XX

125M

STATION

BNE3X-XX

45M

| CONTROLLER | BNE4X-XX
TYPE:

11.25M

DECNA

STATION

CONTROLLER

TYPE
DEUNA

BNE3X-XX

40M

BNE4X-XX

10M

BNE3X-XX

50M

BNE4X-XX

1256M

. =

DELNI
(GLOBAL MODE)

STATION

BNE3X-XX

50M

CONTROLLER | BNE4X-XX.

TYFE
DEQNA

125M

STATION
=R
BNE3X-XX
CONTROLLER | BNE4X-XX
TYPE:
DECNA

45M
11.25M

LEGEND

LOCAL CONNECTOR
GLOBAL CONNECTOR

NOTES

THE

DIFFERENCES

SPECIFIED

FOR

USE

CABLE

WITH

LENGTHS

EACH

TYPE

CONTROLLER ARE DUE TO THE LENGTHS
AND TYPE OF CABLING WHICH IS A PART OF

EACH CONTROLLER.
MKVB4-1032

Figure 2-2

Configuration Guidelines and Limitations: Two-Tier DELNI LAN

STATION

)

LENGTHA

| Tope. Coon |

| DEUNA

BNE3X-XX

40M

BNE4X-XX

s | LENGTHB | ETHERNET

TRANSCEIVER

10M

DELNI

STATION

(GLOBAL MODE)

CONTROLLER L
TYPE:

DEQNA

LENGTHA

BNE3X-XX

BNE4X-XX

45M

o ..

11.25M

STATION
P

.‘;g;’?%ugfi )
QECN’A
.

LENGTH A

BNE3X-XX

BNE4AX-XX

40M

10M

LEGEND

** LOCAL CONNECTOR
## GLOBAL CONNECTOR

NOTES
THE LENGTHS SPECIFIED UNDER 'LENGTH A’

ARE THE TOTAL CABLE LENGTHS (LENGTH A
PLUS

LENGTH B}

THE

CONTROLLER

ALLOWABLE

AND THE

BETWEEN

ETHERNET

TRANSCEIVER.
THE

DIFFERENCES

CABLE

LENGTHS

SPECIFIED FOR USE WITH EACH TYPE OF
CONTROLLER ARE DUE TO THE LENGTHS
AND TYPE OF CABLING WHICH IS A PART OF

EACH CONTROLLER.
THE CABLE SEGMENT LABELED "LENGTH B’
MAY BE MADE UP OF TRANSCEIVER CABLES

JOINED

ETHERJACK

CONNECTION

BOX.
MKVB4-1023

Figure 2-3 C@nfiguraiiafi Guidelines and Limitations: Connected DELNI LAN

2-4

INPUT/OUTPUT SIGNAL FLOW,

The DELNI communication interfaces are effected through the following connectors.
¢
¢

Eight (8) local connectors
One (1) global connector

3.1.1
Local Connector Interfaces
The eight local connectors are physically isolated from the metal chassis. The backshell of each of these
connectors is electrically connected to chassis ground through capacitors to maintain electrical isolation.

The electrical isolation characteristics are:
®

Impedance (connector backshell to chassis) 3 MHz to 30 MHz

[solation at 60 Hz

10 2 maximum
0.5 € minimum

280K Q typical
250K €I minimum

Breakdown voltage at 60 Hz
-

270 V rms

Each of the eight local connectors provide the signal line interfaces listed in Table 3-1
3.1.2 Global Connector Interfaces
The global connector is physically and electrically connected directly to the DELNI chassis (chassis
ground) by the metal shell of the connector. The electrical characteristics of this connection are:
°

Resistive at dc
Inductive at 10 MHz

0.10 Q@ maximum

50 nH

The global connector provides the signal line interfaces listed in Table 3-2

Table 3-1

Local Connector Signal Line Interfaces

Local
Connector
Pin

Interface
Signal
Designation

|
2
3
4
5

No Connection
CHn COLLISION PRESENCE (+)*
CHn TRANSMIT (+)t
Reserved
CHn RECEIVE (+)*

7
8

Reserved
Reserved

CHn COLLISION PRESENCE (—)*

CHn TRANSMIT (—)t

Reserved
CHn RECEIVE (—)*
POWER (+)i
Reserved
Reserved

12
13
14
15

* Denotes output signals
+ Denotes input signals
1 POWER input not used at DELNI unit (no internal connection)

Table 3-2

Glebal’

Connector
Pin

Global Connector Signal Line Interfaces

Interface

Signal
Designation

]

No Connection

2
3

XCVR COLLISION PRESENCE (+)t
XCVR TRANSMIT (+)*

Reserved

5
6

XCVR RECEIVE (+)t
XCVR POWER (RTN) *

7
8

Reserved
Reserved

9
10

XCVR COLLISION PRESENCE (—)*
XCVR TRANSMIT (—)*

11
12

Reserved
XCVR RECEIVE (=)t

XCVR POWER (+)*

14
15

Reserved
Reserved

* Denotes output signals
1 Denotes input signals

3.2

INPUT/OUTPUT SIGNAL FLOW AND TIMING RELATIONSHIPS

3.2.1 LOCAL Mode Signal Flow and Timing Relationships (Figures 3-1 and 3-2)
In the LOCAL mode of operation, the signal asserted on a CHn TRANSMIT pair is routed to each of the
CHn RECEIVE pairs.
Following termination of the signal asserted on the CHn TRANSMIT pair, a heartbeat signal is asserted
on all CHn COLLISION PRESENCE pairs.

The time delay between assertion of the CHn TRANSMIT pair signal and assertion of the CHn
RECEIVE pairs signal 1s due to DELNI squelch circuit characteristics. The time delay between the data
content of the CHn TRANSMIT pair signal and the data content of the CHn RECEIVE pairs signal is
due to steady-state propagation delay through the DELNI unit.
The CHn COLLISION PRESENCE pairs of the DELNI unit are asserted during two conditions.
1.

After the end of each transmission interval (heartbeat signaling)

During a transmission interval in which two or more CHn TRANSMIT pairs are being asserted
simultaneously (collision condition).

For heartbeat signaling, a short duration 10 MHz signal is asserted on all CHn COLLISION PRESENCE
pairs.
For collision condition signaling, a 10 MHz signal is asserted on all CHn COLLISION PRESENCE pairs
until the conflicting CHn TRANSMIT pairs are deasserted. Therefore, no time duration is specified in
Figure 3-2 for the collision signaling condition. (The link level protocol specifies times of 320 ns minimum
and 480 ns maximum.)
3.2.2 GLOBAL Mode Signal Flow and Timing Relationships (Figures 3-3 and 3-4)
In the GLOBAL mode of operation, the signal asserted on a CHn TRANSMIT pair 1s routed to the
XCVR TRANSMIT pair.
The time delay between assertion of the CHn TRANSMIT pair signal and the occurrence of the XCVR
TRANSMIT pair signal is due to DELNI squelch circuit characteristics. The time delay between the data
content of the CHn TRANSMIT pair signal and the data content of the XCVR TRANSMIT pair signal is
due to steady-state propagation delay through the DELNI unit.

The signal being asserted on the XCVR TRANSMIT pair is routed back to the XCVR RECEIVE pair by
the global network device.

The time delay between the assertion of the XCVR TRANSMIT pair signal and assertion of the XCVR
RECEIVE pair signal 1s due to the squelch circuit characteristics and functioning of the global network
device. Therefore, only the maximum allowable delay is specified in Figure 3-4.
The global network device detects all global network transmissions and sends the detected data to the
XCVR RECEIVE pair of the DELNI unit.

The DELNI unit detects the signals asserted on the XCVR RECEIVE pair and routes the signals to all
CHn RECEIVE pairs.

3-3

DELNI (LOCAL MODE)

CH1 TRANSMIT PAIR

XCVR TRANSMIT PAIR

OO0
CH1 RECEIVE PAIR

——
OO

CH1 COLLISION
PRESENCE PAIR

XCVR COLLISION
FRESENCE PAIR

CHZ2 TRANSMIT PAIR

LOCAL CGLL SION

—
YOO

AND HEARTBEAT

SIGNALING

CH2 RECEIVE PAIR

OOOOOOOO——

CH2 COLLISION
PRESENCE PAIR

LOCAL TRANSMIT

AND RECEIVE
DATA PATH

CHS EECE VE PAIR

CH8 COLLISION
FRE‘SENCE PAIR

MKV84-1038

Figure 3-]

LOCAL Mode Signal Flow Diagram

3-4

CHn TRANSMIT PAIR

—/////

W/////////

/2
CHn RECEIVE PAIR

SQUELCH CIRCUIT DELAY

SIGNAL PROPAGATION

DELAY (STEADY STATE)

100 ns MIN, 250 ns MAX

> le——
20 (+5,-10) ns
|

CHn COLLISION PAIR

(HEARTBEAT SIGNALING)

HEARTBEAT START—>

HEARTBEAT DURATION
HEARTBEAT CONCLUSION —

<«—— 1000 ns TYP, 360 ns MIN

le——600 ns TYP, 400 ns MIN
be——16 us TYP, 2 us MAX

CHn COLLISION PAIR

COLLISION DETECTION

(COLLISION SIGNALING)

100 ns MIN, 320 ns MAX

tq COLLISION SIGNALING
MK V84.1040

Figure 3-2

LOCAL Mode Signal Timing Diagram

The time delay between assertion of the XCVR RECEIVE pair signal and assertion of the CHn
RECEIVE pairs signal is due to the DELNI squelch circuit characteristics. The actual time delay between
the data content of the XCVR RECEIVE pair signal and the data content of the CHn RECEIVE pairs
signal is due to steady-state propagation delay through the DELNI unit.

For global heartbeat and collision signaling, the global network device asserts the XCVR COLLISION
PRESENCE pair.

The DELNI unit responds to a signal asserted on the XCVR COLLISION PRESENCE pair by generating and asserting a 10 MHz signal on all CHn COLLISION PRESENCE pairs.

The time delay between assertion of the XCVR COLLISION PRESENCE pair signal and assertion of the
CHn COLLISION PRESENCE pairs signal is due to DELNI squelch circuit characteristics.

The DELNI unit also responds to local collision conditions during the GLOBAL mode of operation.
When a local collision condition is detected, the DELNI unit interrupts the normal data path to the XCVR
TRANSMIT pair and asserts a 5 MHz signal on the XCVR TRANSMIT pair. This ensures that a signal
that meets Ethernet requirements is asserted on the XCVR TRANSMIT pair. The S MHz signal remains
asserted until the conflicting CHn TRANSMIT pairs are deasserted.
For local collision condition signaling, the DELNI unit generates and asserts a 10 MHz signal on all CHn
COLLISION PRESENCE pairs. Local collision signaling starts when the signal transmitted on the
XCVR TRANSMIT pair has been looped back to the XCVR RECEIVE pair by the global network
device, and the received signal has been detected by the DELNI unit. The 10 MHz signal sent on the CHn
COLLISION PRESENCE pairs remain asserted until the conflicting CHn TRANSMIT pairs are deasserted. Therefore, only the maximum time interval between local collision detection and the start of local
collision condition signaling is specified in Figure 3-4.

DELNI (GLOBAL MODE)

XCVR TRANSMIT PAIR

N
GLOBAL
B TRANSMIT
PATH

CH1 TRANSMIT PAIR

CH1 RECEIVE PAIR

XCVR RECEIVE PAIR
O 000000004

_#*&i%*i"—

CH1 COLLISION
PRESE%CE ?A |

LOCAL

OOOOO—T

COLLISION

XCVR COLLISION
PRESENCE PA

)

SOOOOOOCXK

SIGNALING

CH2 RECEIVE PAIR

DOOOOOOOOO—HY

CH2 COLLISION

AND HEARTBEAT

PRESENCE
PAIR

gg?é%@“

PIENALING

GLOBAL

RECEIVE

DATA PATH

CH8 COLLISION
PRESENCE PA

MKVB4-1037

Figure 3-3

GLOBAL Mode Signal Flow Diagram

CHn TRANSMIT PAIR _/ 77 W é
%

/
/

XCVR TRANSMIT PAIR

SQUELCH CIRCUIT DELAY —»{ t&—— 100 ns MIN, 250 ns MAX

SIGNAL PROPAGATION

DELAY (STEADY STATE)

> fe—
20 (+5, —10) ns

XCVR RECEIVE PAIR

7/ ‘ | %7fm

NETWORK DELAY ————]

fe———(SEE NOTES 1, 2, AND 3)

CHn RECEIVE PAIR

A i

SQUELCH CIRCUIT DELAY

SIGNAL PROPAGATION

DELAY (STEADY STATE!}

100 ns MIN, 250 ns MAX

«——

le—
20 (+5,~10) ns

XCVR COLLISION PAIR

(GLOBAL HEARTBEAT SIGNALING)

HEARTBEAT DURATION ——3

CHn COLLISION PAIR

e 400 ns MIN

i”’/%/g

(GLOBAL HEARTBEAT SIGNALING]

SQUELCH CIRCUIT DELAY —

HEARTBEAT START (AFTER

CHn TRANSMIT PAIR DEASSERTED) —>

HEARTBEAT DURATION
HEARTBEAT CONCLUSION —»|

}&——320 ns MAX, 100 ns MIN

———1350 ns TYP, 710 ns MIN

«——600 ns TYP, 400 ns MIN
fe——
1.89 us TYP, 2.29 u's MAX

XCVR COLLISION PAIR

GLOBAL COLLISION OCCURENCE ——

TO COLLISION SIGNALING

fe——900 ns MAX

CHn COLLISION PAIR

(GLOBAL COLLISION SIGNALING)

bbbt

SQUELCH CIRCUIT DELAY——>

f«——320 ns MAX, 100 ns MIN

CHn COLLISION PAIR

LOCAL COLLISION

(LOCAL COLLISION SIGNALING)
ittt

(DETECTION TO SIGNALING]

~1.9us MAX WHEN

INTERFACED TO A BASEBAND NETWORK

—~10.6us MAX WHEN INTERFACED TO A BROADBAND NETWORK

NOTES:
1.

INTHE TWO-TIER DELNI ENVIRONMENT, THE DELAY WILL BE 788 ns MAX,
WHICH INCLUDES DELAYS AS FOLLOWS:

50 M TRANSCEIVER CABLE (5.13 ns/m}, ROUND TRIP DELAY 513 ns
SQUELCH TURN-ON DELAY OF DELNI UNIT, 250 ns MAX
STEADY-STATE DELAY THROUGH DELNI UNIT, 25 ns MAX

INACONNECTED DELN!I LAN ENVIRONMENT, THE DELAY IS 800 ns MAX,

INACONNECTED DELNI LAN ENVIRONMENT, WHICH INTERFACESTO A
BROADBAND NETWORK, THE DELAY IS ~18.6 us MAX.
MEVE4- 1041

Figure 3-4

GLOBAL Mode Signal Timing Diagram

3-7

3.3.1

CHn TRANSMIT Pair Signal Requirements
®

DELNI local connector pins

CHn TRANSMIT (+) Pin 3

CHn TRANSMIT (=) Pin 10

Signal level
-

(measured differentially)

800 mV peak-to-peak minimum
2400 mV peak-to-peak maximum

During the idle state, the output of the circuit driving the CHn TRANSMIT pair must be high. However, during the idle state, the output voltage decays to
zero due to transformer coupling at the DELNI
input. The first transition of the signal asserted on
the CHn TRANSMIT pair must be negative going;
the last transition must be positive going.

3.3.2 CHn TRANSMIT Pair Circuit Response
The CHn TRANSMIT pair is transformer-coupled to a squelch circuit, line receiver, and data gate.
¥

The characteristics of the input circuitry associated with the CHn TRANSMIT pair are as follows.
®

Input impedance

Differential mode @10 MHz
Common mode (3 MHz to 20 MHz)

78 +3.9 Q
18.5 €@ minimum

Isolation transformer
-

Magnetizing inductance

30 uH £10%

Isolation withstanding voltage
Common mode voltage

270 V rms minimum
+30V

Squelch parameters
-

The squelch circuit turns OFF only in response to valid Ethernet signals, remains OFF
during the transmission interval, and turns ON again after the end of the transmission
interval. While the squelch is OFF, it allows the data asserted on the CHn TRANSMIT
pair to pass through the data gate.

The squelch circuit has three parameters: turn-off, stay-off, and turn-on. The following
information specifies squelch action relative to input signal parameters. Note that in the |
following list of parameters, —400 is less than —500.

Turn-off voltage
Turn-off time
Stay-off voltage
Turn-on voltage
Turn-on time

—350 mV typical, —400 mV minimum
100 ns minimum, 250 ns maximum
—200 mV minimum
~150 mV typical, =100 mV maximum
120 ns minimum, 270 ns maximum

3-8

3.3.3 CHn RECEIVE Pair Circuit Characteristics
The characteristics of the circuitry associated with the CHn RECEIVE pairs are as follows.
e

Source impedance of driver
430 Q typical
408
minimum

[solation transformer

3.3.4

Magnetizing inductance
Isolation withstanding voltage

30 uH £10%
270 V rms minimum

CHn RECEIVE Pair Signal Characteristics
e

DELNI local connector pins

~
e

Signal level into 78 +5 Q (measured differentially)
H

;

CHn RECEIVE (+) Pin 5
CHn RECEIVE (-) Pin 12
-

1100 mV peak-to-peak minimum
1500 mV peak-to-peak maximum

Timing asymmetry (duty cycle timing variance for a minimum voltage 10 MHz signal having a
50% duty cycle)

1 ns typical

2 ns maximum

Signal rise/fall time (20% to 80%)

3.5 ns typical
1.5 ns minimum
5.0 ns maximum

NOTE
During the idle state, the output of the circuits driving the CHn RECEIVE pairs is high. However, during the idle state, the output voltage decays to zero
due to transformer coupling. The first transition of
the signal asserted on the CHn RECEIVE pairs is
negative going; the last transition is positive going.

3-9

3.3.5 CHn COLLISION PRESENCE Pair Circuit Characteristics
The characteristics of the circuitry associated with the CHn COLLISION PRESENCE pairs are as
follows.
L

Source impedance of driver
~

430 Q typical
408 Q minimum

Isolation transformer
=

3.3.6

Magnetizing inductance

30 uH +10%

Isolation withstanding voltage

270 V rms minimum

CHn COLLISION PRESENCE Pair Signal Characteristics
DELNI local connector pins

—
-

CHn COLLISION PRESENCE (+) Pin 2
CHn COLLISION PRESENCE (=) Pin 9

Signal level into 78 +5 Q (measured differentially)
—

1100 mV peak-to-peak minimum
1500 mV peak-to-peak maximum

Signal frequency

10 %] MHz

Timing asymmetry (duty cycle timing variance for a minimum voltage 10 MHz signal having a
50% duty cycle)
-

1 ns typical

2 ns maximum

Signal rise/fall time (20% to 80%)

3.5 ns typical
1.5 ns minimum
5.0 ns maximum
NOTE
During the idle state, the output of the circuits driving the CHn COLLISION PRESENCE pairs is
high. However, during the idle state, the output voltage decays to zero due to transformer coupling. The
first transition of the signal asserted on the CHn
COLLISION PRESENCE pairs is negative going.

3-10

3.3.7 XCVR TRANSMIT Pair Circuit Characteristics
The characteristics of the circuitry associated with the XCVR TRANSMIT pair are as follows.
¢

Source impedance of driver
-

3.3.8

430 Q typical
408 Q minimum

XCVR TRANSMIT Pair Signal Characteristics
¢

DELNI global connector pins

Signal level into 78 £5 Q (measured differentially)
-

XCVR TRANSMIT (+) Pin 3
XCVR TRANSMIT (=) Pin 10

1100 mV peak-to-peak minimum
1500 mV peak-to-peak maximum

Timing asymmetry (duty cycle timing variance for a minimum voltage 10 MHz signal having a
50% duty cycle)
E

| ns typical

2 ns maximum

Signal rise/fall time (20% to 80%)
—

3.5 ns typical

1.5 ns minimum

5.0 ns maximum

NOTE
During the idle state, the output of the circuit driv-

ing the XCVR TRANSMIT pair is high. However,
during the idle state, the output voltage decays to
zero due to transformer coupling in the network
device to which the signal is asserted. The first transition of the signal asserted on the XCVR TRANSMIT pair is negative going; the last transition is
positive going.

3.3.9

XCVR RECEIVE Pair Signal Requirements
e

DELNI global connector pins
-

XCVR RECEIVE (+) Pin

XCVR RECEIVE ( —) Pin 12

Signal level (measured differentially)
#

-~
-

800 mV peak-to-peak minimum
2400 mV peak-to-peak maximum

During the idle state, the output of the circuit driving the XCVR RECEIVE pair is high. However,
during the idle state, the output voltage decays to
zero due to transformer coupling. The first transition of the signal asserted on the XCVR RECEIVE
pair must be negative going; the last transition must
be positive going.

3.3.10 XCVR RECEIVE Pair Circuit Response
The XCVR RECEIVE pair is asserted to a squelch circuit and data gate.
The characteristics of the input circuitry associated with the XCVR RECEIVE pair are as follows.
®

Input impedance

Differential mode @10 MHz
Common mode (3 MHz to 20 MHz)

78 £3.9 Q

18.5 Q minimum

Common mode voltage (relative to 12 V return line)
#

+2.1 V minimum

+5.4 V maximum

Squelch parameters

Same as specified for the CHn TRANSMIT pair (refer to Section 3.3.2).

3-12

3.3.11
e

XCVR COLLISION PRESENCE Pair Signal Requirements
DELNI giobal connector pins

-~
e

XCVR COLLISION PRESENCE (+) Pin 2
XCVR COLLISION PRESENCE (=) Pin 9

Signal level (measured differentially)
&

-~
-

800 mV peak-to-peak minimum
2400 mV peak-to-peak maximum

During the idle state, the output of the circuit driving the XCVR COLLISION PRESENCE pair must
be high. However, during the idle state, the output
voltage decays to zero due to transformer coupling.
The first transition of the signal asserted on the
XCVR COLLISION PRESENCE pair must be negative going; the last transition must be positive
going.

3.3.12 XCVR COLLISION PRESENCE Pair Circuit Response
The XCVR COLLISION PRESENCE pair 1s asserted to a squelch circuit.

The characteristics of the input circuitry associated with the XCVR COLLISIO! N PRESENCE pair are as
follows.

Input impedance
-

78
18

Common mode voltage (relative to 12 V return line)
o

Differential mode @10 MHz
Common mode (3 MHz to 20 MHz)

+2.1 V minimum
+5.4 V maximum

Squelch parameters
—

The squelch circuit turns OFF only in response to valid Ethernet signals, remains OFF
while the signal remains asserted, and turns ON again after the signal input has ended.
While the collision presence squelch is turned OFF, it enables the DELNI unit to generate
and assert a 10 MHz signal on the CHn COLLISION PRESENCE pairs.

The squelch circuit has three parameters: turn-off, stay-off, and turn-on. The following
information specifies squelch action relative to input signal parameters. Note that in the
following list of parameters —400 is less than —500.

Turn-off voltage
Turn-off time
Stay-off voltage
Turn-on voltage
Turn-on time

—350 mV typical, —400 mV minimum
100 ns minimum, 250 ns maximum
—200 mV minimum
—150 mV typical, =100 mV maximum
120 ns minimum, 270 ns maximum

3-13

3.3.13 XCVR POWER Pair Characteristics
The XCVR POWER pair of the DELNI unit provides a +12 V power source for an Ethernet transceiver.
The +12 V power source is short-circuit protected by a current-limiting circuit within the DELNTI unit.
The power source can withstand an externally applied voltage [to XCVR POWER (+) pin with respect to
XCVR POWER (RTN) pin] of +15 V maximum without damage to the power source.
The XCVR POWER pair meets the requirements for Class 2 wiring devices.
The general output characteristics are as follows.

DELNI global connector pins
-

XCVR POWER (+)
XCVR POWER (RTN)

Pin 13
Pin6

Qutput voltage (Vout)
-

No load (Iout<Imin)
19 V peak

Imin<lout<Imax
12.5 V typical

14.0 V maximum
11.4 V minimum
NOTE
The output voltage is regulated within the given
range over the intended operational current range of
Iout min to Iout max. Output current above lout
max may cause the supply to come out of regulation
and reduce the output voltage.
®

Output current (Iout)

0.5 A rms maximum (continuous)
0.025 A rms minimum

Qutput current at current limit (output current into 0 V for the current limit mode)
-

2.5 A rms typical

4.0 A rms maximum

2.0 A rms minimum

Ripple voltage

0.5 V peak-to-peak (includes both ripple frequency components)

Ripple frequency

~
-

40 kHz typical
44 kHz maximum
36 kHz minimum

The output ripple has two frequency components:

one at double the line frequency and one at the
power supply switching frequency.

3.3.14 XCVR POWER Pair External Load Requirements
Specific external load requirements are as follows.
¢

Maximum reactive load

2000 uF
| mH

Capacitance
Inductance

Maximum continuous load current fluctuations

200 mA peak-to-peak

0 to 20 kHz

500 mA peak-to-peak

20 kHz to 1 MHz

The input power requirements for the DELNI unit are as follows.
e

Voltage/frequency/phase

—
—
e

Current (steady state)

—
e

0.35 A at 120 Vac
0.18 A at 240 Vac

Inrush current

90-128 Vac/47-63 Hz/single phase
180-256 Vac/47-63 Hz/single phase

A at 120 Vac
10
5 A at 240 Vac

Surge current

-~
-

2 A for 5 cycles at 120 Vac
1 A for 5§ cycles at 240 Vac

3-15

Apparent power

36 W at 120 Vac
36 W at 240 Vac

Maximum power consumption
-

26 Wat 120 Vac

26 W at 240 Vac
®*

Input power protection
-~

Fuse

3AG, 0.5 A, Slo-Blo (U.S. version)
5 X 20 mm, T, 0.5 A (European/GIA version)

The DELNI unit is designed for use in a Digital Equipment Corporat
ion Class C Environment (a non-air
conditioned or exposed area in an industrial site).
The specific operational environmental conditions are as follows.
®

Temperature
-

5°%C (41°F) to 50°C (122°F)

Temperature based on operation at sea level: 760
mm Hg (29.92 in Hg). Maximum allowable temperature is reduced by a factor of 1.8°C/1000 m
(1°F/1000 ft) for operation at high altitude sites.
®

Relative humidity

10% or less to 95% with maximum wet bulb 32°C (90°F) and minimum

dew point 2°C

CHAPTER 4
FUNCTIONAL

THEORY OF OPERATION

4.1

DELNI CIRCUIT CHARACTERISTICS

Figure 4-1 shows a functional block diagram of the DELNI unit. As shown, the DELNI unit is made up of

the following functional circuits.

Power supply
Operating mode control

Isolation transformers,

Eight local connector interfaces with each interface containing:

Transmit pair squelch, line receiver, and data gate,

e
e
e

Receive pair line driver, and
Collision presence pair line driver.

For simplicity, only one of the eight local connector
interfaces are shown in Figure 4-1. The RCV
DATA, CHA COLL EN, and 10 MHz signals
shown in Figure 4-1 are common to all eight local
connector interfaces. The XMIT DATA n and
XMIT n signal outputs are individual outputs of
each local connector interface.
Data concentrator
Data router

Data presence and local collision detector
Data enable/local collision control
Local heartbeat timers
Local/global heartbeat and collision signaling control
10 MHz oscillator
Global XMIT data substitute
Global Connector Interface which contains:

—
-~
-~

4.1.1

Transmit pair line driver,
Receive pair squelch, line receiver, and data gate, and
Collision presence signal detector.

Power Supply

The power supply uses a switching regulator to convert the 120/240 Vac input power to a regulated +4.9
Vdc output and a +12 Vdc output. The +4.9 Vdc output is used to power the DELNI unit. The +12 Vdc¢
output is used to provide power to an Ethernet transceiver. The +12 Vdc output is not directly regulated,
however, since both the +4.9 Vdc and +12 Vdc outputs are derived from the same output transfefmen
regulation of the +12 Vdc output is achieved by regulating the +4.9 Vdc output.
4-1

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4-2

|24n-3l.

The two-position slide switch on the front panel makes the DELNI power supply compatible with either
120 Vac input or 240 Vac input. The +4.9 Vdc output of the power supply drives the power indicator light
(green LED) on the front panel of the DELNI unit.
4.1.2 Operating Mode Control
The operating mode control consists of the [I/lJ (GLOBAL/LOCAL )switch (located on the front panel
of the DELNI unit) and a switch debouncer. The position of the L1/ switch is used by the switch
debouncer to assert the appropriate NI ON (GLOBAL mode) and NI OFF (LOCAL mode) outputs. The
NI ON and NI OFF outputs are used to enable or inhibit functions of the DELNI unit as applicable to the

selected operational mode.

4.1.3

Local Connector Interfaces
As shown in Figure 4-1, each of the eight local connector interfaces is made up of the following.
R’

e
¢

|solation transformers
Transmit pair squelch. line receiver, and data gate

®
e

Receive pair line driver
(Collision presence pair line driver

The 1solation transformers are used to provide electrical isolation between
connected to the local connectors.

the DELNI unit and the devices

The transmit pair squelch, line receiver, and data gate perform the following functions.

The transmit pair squelch provides noise immunity by ensuring that only valid Ethernet signals
are passed through the data gate.

The line receiver amplifies the signals received from the secondary of the isolation transformer.

The data gate allows data from the line receiver to be passed to the XMIT DATA n output only
after the transmit pair squelch parameters have been met.

The receive pair line driver amplifies the RCV DATA signal input and drives the CHn RECEIVE pair of
the DELNI unit.

The collision presence pair line driveris enabled by the CHA COLL EN input. This line driver amplifies
the 10 MHz signal and drives the CHn COLLISION PRESENCE pair of the DELNI unit.
4.1.4

Data Concentrator

The data concentrator combines the XMIT DATA n outputs of the eight local connector interfaces to a
single data signal line (CHA DATA).
4.1.5

Data Router

)

The data router sends the CHA DATA input to either the GATED CHA DATA output (LOCAL mode)
or to the NI CHA DATA output (GLOBAL mode) depending on the mode of operation selected.

4-3

4.1.6 Data Presence and Local Collision Detector
The data presence and local collision detector monitors the operation of the local connector interface
transmitter squelch circuits to detect the following conditions.
®

Data presence
-

Valid Ethernet signals are being asserted on any

n signal 1s asserted).

CHn TRANSMIT pair (that is, an XMIT

Local collision
#

Two or more devices are attempting to transmit simultaneously (that is, more than one
XMIT n signal 1s asserted).

4.1.7 Data Enable/Local Collision Control
The data enable/local collision control is used only during local collision conditions. When a local collision
condition 1s detected (LOCAL COLLISION is asserted), the data enable/local collision control:
®*

Asserts BLOCK CHA DATA to inhibit the normal transmit data path.

Asserts RUN 5 MHz to initiate local collision signaling and, if in GLOBAL mode of operation,
initiates gating of substitute data to the global network device.

Once the data enable/local collision control has been set due to a local collision condition. it remains set for
as long as any device remains transmittin g.
&

4.1.8 Local Heartbeat Timers
The local heartbeat timers are used only during the LOCAL mode of operation to control the interval and
the duration of the LOCAL HEARTBEAT signal.

The local heartbeat timers are charged during the interval that DATA PRESENT is asserted. When the
DATA PRESENT signal 1s deasserted, the local heartbeat timers start a timeout sequence. The timeout
sequence controls the interval and duration of the LOCAL HEARTBEAT signal.
4.1.9

Local/Global Heartbeat and Collision Signaling Control
The local/global heartbeat and collision signaling control is used to turn on the 10 MHz oscillator and
enable the collision presence pair line drivers of the local connector interface.

LOCAL mode operation
During the LOCAL mode of operation, the local/global heartbeat and collision signaling control is used to
control local collision condition signaling and local heartbeat signaling.
®

Local heartbeat signaling — Asserts the ENABLE OSCILLATOR and the CHA COLL EN
outputs for as long as the LOCAL HEARTBEAT signal is asserted.

Local collision signaling — Asserts the ENABLE OSCILLATOR and the CHA COLL EN
outputs for as long as the RUN 5 MHz signal is asserted.

4-4

GLOBAL mode operation

During the GLOBAL mode of operation, the local/global heartbeat and collision signaling control 1s used

to signal local collision conditions, global collision conditions, and global heartbeat.
e

Local collision signaling
&

Asserts the ENABLE OSCILLATOR output in response to the RUN 5 MHz input.

Asserts the CHA COLL EN output in response to the NI RECEIVE DATA input.

Global collision and global heartbeat signaling

—

Asserts the ENABLE OSCILLATOR and the CHA COLL EN outputs in response to the
NI COLL input.

10 MHz Oscillator

4.1.10

The 10 MHz oscillator generates and asserts a 10 MHz square wave on the 10 MHz signal line in response
to an ENABLE OSCILLATOR input.

4.1.11

Global XMIT Data Substitute

The global XMIT data substitute is used only during the GLOBAL mode of operation to maintain an
average 50/50 duty cycle on the NI XMIT DATA signal line during local collision conditions.

The global XMIT data substitute is enabled by the RUN 5 MHz signal input when the DELNI unit is in
the GLOBAL mode of operation (NI ON is asserted).

The global XMIT data substitute generates the XCVR 5 MHz signal from the 10 MHz input.
4.1.12

Global Connector Interface

Transmit pair line driver

Collision presence signal detector

As shown in Figure 4-1, the global connector interface is made up of the following.
e

Receive pair squelch, line receiver, and data gate

The transmit pair line driver amplifies the NI XMIT DATA signal input and drives XCVR TRANSMIT
pair of the DELNI unit.

The receive pair squelch, line receiver, and data gate is enabled only when the DELNI unit is in the
GLOBAL mode of operation (NI OFF asserted). These circuits perform the following functions.

Ethernet signals
The receive pair squelch provides noise immunity by ensuring that only valid pair
squelch also

on the XCVR RECEIVE pair are passed through the data gate. The receive
asserts the NI RECEIVE DATA signal output when the receive pair squelch parameters have
been met.

The line receiver amplifies the signals received on the XCVR RECEIVE pair.

The data gate allows data from the line receiver to be passed to the NI RCV DATA signal line
only after the receive pair squelch parameters have been met.

4-5

The collision presence signal detector is enabled only when the DELNI unit is in the GLOBAL mode of

operation (NI ON asserted). The collision presence signal detector is a squelch circuit that asserts the N |
COLL output signal when a valid signal is asserted on the XCVR COLLISION PRESENCE pair.

To provide a cohesive functional theory of operation, the operation of the DELNI unit is discussed relative
to the functions performed in each operational mode.

4.2.1

LOCAL Mode Functional Theory

4.2.1.1

Transmit/Receive — The DELNI unit provides the data paths between the CHn TRANSMIT

and RECEIVE pairs of the local connectors. The data path between the CHn TRANSMIT pairs and CHn
RECEIVE pairs is made up of the following functional circuits (refer to Figure 4-1).
®
e

Local connector interface transmit pair squelch, line receiver, and data gate
Data concentrator

e
®

Data router
Local connector interface receive pair line driver

The signals asserted on any one of the eight CHn TRANSMIT pairs are coupled through an isolation

transformer and asserted to the associated transmit pair squelch and line receiver. The line receiver
amplifies the signals asserted on the CHn TRANSMIT pair and asserts the amplified signals to the data
gate.

The transmitter squelch turns OFF only after the differential signal input has met the specific threshold
and timing requirements outlined in Chapter 2.
When the transmitter squelch turns OFF, it enables the data gate to pass the output of the line

receiver to
the XMIT DATA n signal line. Also, when the squelch turns OFF, it asserts an XMIT n signal to the data

presence and local collision detector.

The eight XMIT DATA n signal lines are ORed together. This is allowed. since according to Ethernet

protocol, for a valid transmission to occur, only one device may be transmitting at any one time. The data
concentrator performs the OR function to concentrate the XMIT DATA n signal lines to the CHA DATA

signal line.

The CHA DATA output of the data concentrator is wire ORed with the BLOCK CHA DATA signal

from the data enable/local collision control. The BLOCK CHA DATA signal is asserted only during local

collision conditions to block the conflicting data signals from being asserted to the data router.

In the LOCAL mode of operation, the data router asserts the CHA DATA input on the GATED CHA
DATA output.

The GATED CHA DATA output is coupled through an OR gate to the RCV DATA input of all local
connector interface receive pair line drivers. These line drivers amplify the RCV DATA signal input and
drive CHn RECEIVE pairs.

4.2.1.2 Local Heartbeat Signaling - Local heartbeat signaling is performed by the following
functional
circuits (refer to Figure 4-1).
Data presence and local collision detector
Local heartbeat timers
Local/global heartbeat and collision signaling control
10 MHz oscillator
Local connector interface collision presence pair line drivers

4-6

During each transmission interval, an XMIT n signal is asserted to the data presence and local collision
detector by the local connector interface squelch circuit. At the end of the transmission interval, the
squelch circuit deasserts the XMIT n signal. While the XMIT n signal is asserted, the data presence and
#

local collision detector asserts DATA PRESENT.

The local heartbeat timers use the DATA PRESENT signal to generate the LOCAL HEARTBEAT
signal. The local heartbeat timers contain two RC networks. While DATA PRESENT is asserted, it
conditions the RC networks. When DATA PRESENT is deasserted, the RC networks, which are coupled
to differential amplifiers, control assertion of the LOCAL HEARTBEAT signal. This output is asserted
approximately 0.8 us after the DATA PRESENT signal is deasserted and remains asserted for approximately 1.4 us. This provides a 0.6 us window following each transmission interval in which heartbeat
signaling 1s performed.

The LOCAL HEARTBEAT signal enables the ENABLE OSCILLATOR and CHA COLL EN outputs
of the local/global heartbeat and collision signaling control.

The ENABLE OSCILLATOR signal turns on the 10 MHz oscillator, which sends a 10 MHz signal to
each of the local connector interrace collision presence pair line drivers.

The CHA COLL EN signal enables the local connector interface collision presence pair line drivers to pass
the 10 MHz signal to the CHn COLLISION PRESENCE pairs.

4.2.1.3

Local Collision Detection — Local collision detection is performed by the data presence and local

collision detector shown in Figure 4-1.

When valid Ethernet signals are asserted on a CHn TRANSMIT pair, the associated local connector
interface squelch circuit turns OFF. While the associated squelch circuit 1s OFF, it asserts an XMIT n
signal to the data enable and local collision detector.

The data enable and local collision detector incorporates an exclusive OR circuit that asserts the LOCAL
COLLISION output if more than one XMIT n signal is asserted.

4.2.1.4 Local Collision Signaling — Local collision signaling is performed by the following functional

circuits (refer to Figure. 4-1).

Data enable/local collision control

Local/global heartbeat and collision signaling control
10 MHz oscillator

Local connector interface collision presence pair line drivers

When a local collision condition is detected, a LOCAL COLLISION signal is asserted to the data
enable/local collision control. This circuit responds to the LOCAL COLLISION signal by asserting the
¥

BLOCK CHA DATA and RUN 5 MHz outputs.

The BLOCK CHA DATA and RUN 5 MHz signals remain asserted until all CHn TRANSMIT pairs
become inactive. When this happens, the DATA PRESENT output of the data presence and local
collision detector is deasserted. When DATA PRESENT is deasserted, the BLOCK CHA DATA and
RUN 5 MHz outputs of the data enable/local collision control are deasserted.
The BLOCK CHA DATA output is wire ORed with the CHA DATA output of the data concentrator.
When the BLOCK CHA DATA signal is asserted, it blocks the conflicting data outputs from being
asserted to the data router.

4-7

The RUN 5 MHz output is asserted to the local/global heartbeat and collision signaling control, where it
enables the the ENABLE OSCILLATOR and CHA COLL EN outputs.
The ENABLE OSCILLATOR signal turns ON the 10 MHz oscillator, which sends a 10 MHz signal to
each of the local connector interface collision presence pair line drivers.
The CHA COLL EN signal enables the local connector interface collision presence pair line drivers to pass

the 10 MHz signal to the CHn COLLISION PRESENCE pairs.

4.2.2

GLOBAL Mode Functional Theory

4.2.2.1
Transmit - The DELNI provides the data paths between the CHn TRANSMIT pairs of the local
connectors and XCVR TRANSMIT pair of the global connector interface. The data path between any of

the CHn TRANSMIT signal line pair inputs and the XCVR TRANSMIT signal line pair outputs is made
up of the following functional circuits (refer to Figure 4-1).
Local connector interface transmit pair squelch, line receiver, and data gate
Data concentrator

Data router
Global connector interface transmit pair line driver

The signals asserted on any one of the eight CHn TRANSMIT pairs are coupled through an isolation
transformer and asserted to the associated transmit pair squelch and line receiver. The line receiver
amplifies the signals and asserts them to the data gate.

The transmitter squelch turns OFF only after the differential signal input has met the specific threshold
and timing requirements outlined in Chapter 2.

When the transmitter squelch turns OFF , 1t enables the data gate to pass the output of the line receiver to

the XMIT DATA n signal line. Also, when the squelch turns OFF, it asserts an XMIT n signal to the data

presence and local collision detector.

The eight XMIT DATA n signal lines are wire ORed together. This is allowed, since according to Ethernet
protocol, for a valid transmission to occur, only one device may be transmitting at any one time. The data

concentrator performs the OR function to concentrate the XMIT DATA n signal lines to the CHA DATA

signal line.

The CHA DATA output of the data concentrator is wire ORed with the BLOCK CHA DATA signal
from the data enable/local collision control. The BLOCK CHA DATA signal 1s asserted only during local

collision conditions to block conflicting data signals from being asserted to the data router.

In the GLOBAL mode of operation, the data router asserts the CHA DATA input on the NI CHA DATA

output.

The NI CHA DATA output is wire ORed with the XCVR 5 MHz output of the global XMIT data
substitute to produce the NI XMIT DATA signal. The XCVR 5 MHz signal is asserted only during local
collision conditions.

The NI XMIT DATA signal goes to the transmit pair line driver, which sends the data on the XCVR
TRANSMIT npair.
4.2.2.2 Local Collision Detection — Local collision detection is performed by the data presence and local
collision detector shown in Figure 4-1.

4-8

When valid Ethernet signals are asserted on a CHn TRANSMIT pair, the associated local connector
interface squelch circuit turns OFF. While the associated squelch circuit is OFF, it asserts an XMIT n

signal to the data enable and local collision detector.

The data enable and local collision detector incorporates an exclusive OR circuit that asserts the LOCAL
COLLISION output if more than one XMIT n signal is asserted.
4.2.2.3 Local Collision Condition Data Control and Collision Signaling - When a local collision condition is detected during the GLOBAL mode of operation, the DELNI unit performs the following.

Blocks the CHA DATA signal from being asserted on the NI CHA DATA signal line. (This
signal is blocked since it results from the signal inputs from more than one transceiver and thus
may not conform to Ethernet requirements.)

Asserts a 5 MHz square wave signal on the NI XMIT DATA signal line to ensure that the
signals asserted on the XCVR TRANSMIT pair of the DELNI unit maintain a 50/50 duty
cycle. The DELNI unit ensures that the transmission attémpt is recognized by the global
network device.

Signals the transmitting devices that a collision condition exists.
®

The local collision condition data control and collision signaling function of the DELNI unit 1s implemented by the following functional circuits (refer to Figure 4-1).
Data enable/local collision control
Local/global heartbeat and collision signaling control
10 MHz oscillator
Global XMIT data substitute

Local connector interface collision presence pair line drivers

When a local collision condition is detected, the data presence and local collision detector asserts the
LOCAL COLLISION signal. This signal sets the data enable/local collision control causing 1t to assert the
BLOCK CHA DATA and RUN 5 MHz signals.

The BLOCK CHA DATA output is wire ORed with the CHA DATA output of the data concentrator.
When the BLOCK CHA DATA signal is asserted, it blocks the conflicting data outputs from being
asserted to the data router.

The RUN 5 MHz output is asserted to the local/global heartbeat and collision signaling control and to the
global XMIT data substitute. At the local/global heartbeat and collision signaling control, the RUN 5

MHz input causes the ENABLE OSCILLATOR signal to be asserted. The ENABLE OSCILLATOR

signal turns on the 10 MHz oscillator.

At the global XMIT data substitute, the RUN 5 MHz signal enables the XCVR 5 MHz signal to be
generated from the 10 MHz input. The XCVR 5 MHz signal is asserted on the NI XMIT DATA input to
the global connector interface transmit pair line driver.

4-9

The local collision condition is not signaled on the CHn COLLISION PRESENCE npairs of the DELNI
until;
¢

The XCVR 5 MHz signal asserted on the XCVR TRANSMIT pair has been returned to the

XCVR RECEIVE pair.

The signal returned on the XCVR RECEIVE

pair has been detected by the DELNI unit.

After valid Ethernet signals are asserted on the XCVR RECEIVE pair, the global connector interface

receive pair squelch asserts an NI RECEIVE DATA signal. This signal indicates that data is being
received by the DELNI unit.

The NI RECEIVE DATA signal is asserted to the local/global heartbeat and collision signaling control.
Since the RUN 5 MHz is already asserted, the NI RECEIVE DATA input causes the CHA COLL EN

output to be asserted. The CHA COLL EN signal enables the local connector interface collision presence

line driver to pass the 10 MHz signal to the CHn COLLISION PRESENCE pairs.

4.2.2.4 Receive - The DELNI unit provides the data path between the XCVR RECEIVE pair of the
global connector interface and the CHn RECEIVE pairs of the local connector interface. The data path
between the XCVR RECEIVE pair and the CHn RECEIVE pairs is made up of the following functional
circuits (refer to Figure 4-1).
®

Global connector interface squelch, line receiver, and data gate

Local connector interface receive pair line driver

The signals asserted on the XCVR RECEIVE pair are asserted to the global connector squelch, line
receiver, and data gate. This functional circuit is enabled only during the GLOBAL mode of operation by
the NI OFF signal input.
The line receiver amplifies the signals asserted on the XCVR RECEIVE pair and asserts the amplified
signals to the data gate.
The squelch turns OFF only after the differential signal input has met the specific threshold and timing
requirements outlined in Chapter 2.
When the squelch turns OFF, it enables the data gate to pass the output of the line receiver to the NI RCV

DATA signal line. Also, when the squelch is turned OFF, it asserts an
by the local/global heartbeat and collision signaling control.

NI RECEIVE DATA signal used

The NI RCV DATA is coupled to the input of all of the local connector interface receive pair line drivers

as the RCV DATA input.

Each of the local connector interface receive pair line drivers amplifies the RCV DATA input and drives
the CHn RECEIVE pairs of the DELNI unit.
|
4.2.2.5 Global Collision and Heartbeat Signal Detection — The global connector interface collision
presence signal detector (see Figure 4-1) provides monitoring of the XCVR COLLISION PRESENCE

pair to detect global collision and heartbeat signaling.

The global connector interface collision presence signal detector is a squelch ciruit that is enabled only
during the GLOBAL mode of operation by the NI ON signal input.
The squelch circuit is turned OFF only by valid Ethernet signal inputs. The squelch turns OFF only after
the differential signal input has met the specific threshold and timing requirements outlined in Chapter 2.

4-10

When the squelch turns OFF, it asserts an NI COLL signal to the local/global heartbeat and collision
signaling control. The presence of this signal indicates that a global collision or global heartbeat signal is
being asserted by the global network device.

4.2.2.6

Global Collision and Heartbeat Signaling — The global collision and heartbeat signaling function

of the DELNI is implemented by the following functional circuits (refer to Figure 4-1).
e
¢

[ocal/global heartbeat and collision signaling control
10 MHz oscillator

[ocal connector interface collision presence pair line drivers

When a global collision or global heartbeat signal is detected, the global connector interface collision
presence signal detector asserts an NI COLL signal. The NI COLL signal remains asserted for as long as
the global collision or global heartbeat signal is present on the XCVR COLLISION PRESENCE pair.

Assertion of the NI COLL signal causes the local/global heartbeat and collision signaling control to assert
the ENABLE OSCILLATOR and CHA COLL EN outputs.

The ENABLE OSCILLATOR output turns ON the 10 MHz oscillator, which sends a 10 MHz signal to
the local connector interface collision presence pair line drivers.
%

The CHA COLL EN

output enables the local connector interface collision presence pair line drivers to

pass the 10 MHz signal to the CHn COLLISION PRESENCE pairs.

MODULE REMOVAL AND
REPLACEMENT INSTRUCTIONS

5.1 LOGIC MODULE REMOVAL PROCEDURE
To remove the logic module (P/N 54-15475/JQ) from the DELNI unit, perform the following procedure.
1.

Disconnect ac power cord from facility power outlet.
®

NOTE
The screws that secure the plastic case about the

DELNTI unit are captive screws. In Step 2 below, do
not remove the screws from the plastic case.
Loosen the four screws (Items 1 through 4, Figure 5-1) that hold the top and bottom sections of
|
the plastic case together.
Remove the plastic case.
L

Remove the six screws (Items 1 through 6, Figure 5-2) that secure the metal casing cover in
place.

Remove the metal casing cover.
Disconnect plug (Item 13) from connector (Item 9).

Remove the three screws (Items 7, 8, and 10) that secure the logic module to the metal casing.
Grasp the logic module at the areas designated (Points A and B in Figure 5-2) and gently pull
the logic module in the direction indicated by the arrows until the logic module connectors
disengage from the connector board bayonet connectors.

To remove the connector board (P/N 54-15628/JQ), perform the logic module removal procedure
(Section 5.1), and then perform the following procedure.
1.

Remove the two screws (Shown in Detail A of Figure 5-1) that secure the slide latch to the
global connector.

Remove the slide latch from the global connector.
Remove the seven screws (Items 11, 12, and 14 through 18, Figure 5-2) that secure the
connector board to the metal housing.

In Step 4, use care in removing the connector board:
the decal on the metal housing sticks to the
LOCAL/GLOBAL switch on the connector board.
4.

Grasp the connector board at the top outside edges and pull gently away from the metal

housing.

(NOT SHOWN)

DETAIL ‘A’

LARGER

SLIDE-LATCH

MKVB4-1034

Figure 5-1

DELNI Plastic Case Removal

5-2

METAL CASING
COVER

CONNECTOR

CIRCUIT BOARD
BAYONNET

CONNECTORS
"

LOGIC
MODULE

/" JACKS

MKVB4-1033

Figure 5-2

DELNI Exploded View

5-3

The metal housing of the DELNI unit contains
raised metal strips directly behind the area where

the lower portion of the connector board is to be
positioned.

Place the lower edge of the connector board between the raised metal strips of the metal
housing and the front panel.
Place the connector board in position against the front panel.

Install the seven screws (Items 11, 12, and 14 through 18, Figure 5-2) that secure the connector

board to the metal housing.

NOTE
In Step 4, make certain that the large slide-latch slot
(shown in Detail A of Figure 5-1) is positioned with
the larger slide-latch slot on the bottom.

Place the slide latch on the global connector.

Install the two screws (Shown in Detail A of Figure 5-1) that secure the slide latch to the global

connector.

The following procedure assumes that the connector board is installed.
1.

Grasp the logic module at the areas designated (Points A and B in Figure 5-2) and position the
logic module such that the logic module jacks are aligned with the connector board bayonet

connectors.

Mate the logic module jacks and connector board bayonet connectors by exerting an even

pressure at the areas designated (Points A and B).

Install the three screws (Items 7, 8, and 10) that secure the logic module to the metal casing.

Connect plug (Item 13) to connector (Item 9).
Place the metal casing cover in the proper position.
Install the six screws (Items 1 through 6) that secure the metal casing cover in place.

Properly position the metal housing within the plastic case (see Figure 5-1).

Tighten the four screws (Items 1 through 4) that hold the top and bottom sections of the plastic

case together.