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EK-DEFEB-IN-C01

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Document:	DECbridge 500/600 Series Installation and Upgrade
Order Number:	EK-DEFEB-IN
Revision:	C01
Pages:	105
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DECbridge 500/600 Series

Installation and Upgrade

Order Number: EK–DEFEB–IN. C01

NOTICE – Class A Laser Device:
The lasers in this equipment are Class 1 devices, compliant with CDRH Rules 21, CFR
Subchapter J, Part 1040.10, at date of manufacture. Class 1 laser devices are not
considered to be hazardous.

NOTICE – Class A Computing Device:
This equipment generates, uses, and may emit radio frequency energy. The equipment
has been type tested and found to comply with the limits for a Class A computing device
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, measures taken to correct the interference are at the user’s expense.

CAUTION
This equipment is in the 1st Class category (information equipment to be used in
commercial and/or industrial areas) and conforms to the standards set by the Voluntary
Control Council for Interference by Data Processing Equipment and Electronic Office
Machines aimed at preventing radio interference in commercial and/or industrial areas.
Consequently, when used in a residential area or in an adjacent area thereto, radio
interference may be caused in radios and TV receivers, etc. Read the instructions for
correct handling.

DECbridge 500/600 Series

Installation and Upgrade

March 1993
Supersession/Update Information:

Order Number: EK-DEFEB-IN. C01

This is a revised manual.

EK–DEFEB-IN. C01
March 1993

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.
Copyright  1993 by Digital Equipment Corporation
All Rights Reserved.
Printed in U.S.A.

The following are trademarks of Digital Equipment Corporation:
DEC
DECbridge
DECconcentrator
DECconnect
DECdirect
DECelms
DECmcc

DECnet
DELNI
DEMPR
DESTA
OpenVMS
Scholar
ThinWire

VAX
VMS
VT
ULTRIX

MS-DOS is a registered trademark of Microsoft Corporation.
Novell is a registered trademark of Novell, Inc.
NetWare is a registered trademark of Novell, Inc.
OS/2 is a registered trademark of International Business Machines Corporation.
UNIX is a registered trademark of UNIX Systems Laboratories, Incorporated.
Windows NT is a trademark of Microsoft Corporation.

This manual was produced by Telecommunications and Networks Publications.

Contents
Safety

Preface

Installing the Bridge
1.1
1.1.1
1.1.2
1.1.3
1.2
1.2.1
1.2.2
1.3
1.4
1.5
1.6
1.6.1
1.6.2

Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
DECbridge 500/600 Series Features . . . . . . . . . . . . . . . . . . .
DECbridge 500 Series Features . . . . . . . . . . . . . . . . . . . . . . .
DECbridge 600 Series Features . . . . . . . . . . . . . . . . . . . . . . .
Site Verification . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Site Verification Checklist . . . . . . . . . . . . . . . . . . . . . . . . . . .
Service . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Unpacking and Inspecting the Shipping Package . . . . . . . . . . .
Setting Configuration Switches . . . . . . . . . . . . . . . . . . . . . . . . .
Automatic Voltage Setting . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Locations for Installing the DECbridge 500/600 Series Unit . .
Installing the DECbridge 500/600 Series Unit on
a Tabletop or Desktop . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Installing the DECbridge 500/600 Series Unit in
a Rackmount . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

1–1
1–2
1–3
1–3
1–3
1–4
1–5
1–5
1–7
1–7
1–7
1–7
1–8

iii

Installing a New Module to Upgrade the Bridge
2.1
2.2
2.3
2.4
2.4.1
2.4.2
2.5
2.6
2.7
2.7.1
2.8

2–1
2–2
2–2
2–4
2–5
2–5
2–5
2–6
2–6
2–8
2–9

Connecting Communications Cables and
Verifying Bridge Operation
3.1
3.2
3.2.1
3.2.2
3.3
3.4
3.4.1
3.4.1.1
3.4.2
3.5
3.5.1
3.5.2
3.6
3.6.1
3.7
3.8

Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
DECbridge 500/600 Series Technical Information . . . . . . . . . .
Unpacking and Inspecting Upgrade Kits . . . . . . . . . . . . . . . . . .
Site Verification . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Site Verification Checklist . . . . . . . . . . . . . . . . . . . . . . . . . . .
Service . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Preparing the Bridge for Upgrade . . . . . . . . . . . . . . . . . . . . . . .
Tools Required . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Removing a DECbridge Module . . . . . . . . . . . . . . . . . . . . . . . .
Installing a DECbridge 500/600 Series Module . . . . . . . . . .
Updating Labels . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Connecting the ThinWire Cable . . . . . . . . . . . . . . . . . . . . . . . . .
Connecting to the Middle of a ThinWire Segment . . . . . . . .
Connecting to the End of a ThinWire Segment . . . . . . . . . . .
Connecting the AUI Cable . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Connecting the FDDI Cable . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Connecting an FDDI Cable with a Multimode Connector . .
Installing the Optical Bypass Switch . . . . . . . . . . . . . . . . .
Connecting an FDDI Cable with a Single-mode Connector .
Connecting the OBM Cable . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Connecting the OBM Cable Directly to a Terminal . . . . . . .
Connecting the OBM Cable Through a
Modem to a Terminal . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Verifying Bridge Operation . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Powering Up . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Checking the Logical Link . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Final Procedures . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

3–1
3–2
3–3
3–3
3–4
3–7
3–7
3–8
3–9
3–11
3–12
3–12
3–13
3–13
3–16
3–16

Using Local Console Management
4.1
4.2
4.2.1
4.3
4.4
4.5

Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Accessing LCM . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Attributes Displayed When Using LCM . . . . . . . . . . . . . . . .
Messages Displayed . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Setting the Attribute Values . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Switching from LCM to SLIP MODE . . . . . . . . . . . . . . . . . . . .

Solving Problems
5.1
Basic Troubleshooting . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
5.1.1
Determining Symptoms and Following Corrective Actions .
5.1.2
Port Loopback Testing . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
5.1.2.1
Installing the Loopback Connectors . . . . . . . . . . . . . . . . .
5.1.2.2
Running the Loopback Test and Observing the Results . .
5.1.2.3
Returning to Normal Operation . . . . . . . . . . . . . . . . . . . . .

5–1
5–2
5–8
5–8
5–12
5–12

DECbridge 500/600 Series Models
A.1

4–1
4–2
4–3
4–5
4–5
4–5

DECbridge Modules . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

A–4

Switches and Indicators
B.1
B.2
B.3
B.4
B.5
B.6
B.7

Configuration Switches . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Bridge LED Indicators . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Circuit Breaker . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Port Addressing . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Optical Bypass Connector . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
FDDI Connector Keying . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
FDDI Connection Rules . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

B–1
B–5
B–7
B–7
B–8
B–9
B–10

Specifications
C.1
C.1.1

Specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Cable Specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Hardware Upgrade Options

Related Documents

C–1
C–3

Index
Examples

Figures
1–1
1–2
1–3
1–4
1–5
2–1
2–2
2–3
2–4
2–5
3–1
3–2
3–3
3–4
3–5
3–6

A DECbridge 500/600 Series Unit (I/O Panel) . . . . . . . . . . . . .
Shipping Package Contents . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Installing U-Nuts on Rack . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Attaching Mounting Brackets . . . . . . . . . . . . . . . . . . . . . . . . . .
Installing a Bridge in a Rack . . . . . . . . . . . . . . . . . . . . . . . . . . .
DEFEB-UP Upgrade Kit Contents . . . . . . . . . . . . . . . . . . . . . . .
DEFEB-UG Upgrade Kit Contents . . . . . . . . . . . . . . . . . . . . . .
DEFEB-UR Upgrade Kit Contents . . . . . . . . . . . . . . . . . . . . . .
Module Removal and Replacement . . . . . . . . . . . . . . . . . . . . . .
Locations for Applying Upgrade Labels . . . . . . . . . . . . . . . . . .
ThinWire, AUI, FDDI, and OBM Connectors . . . . . . . . . . . . . .
ThinWire Cable Connector . . . . . . . . . . . . . . . . . . . . . . . . . . . .
AUI Connector Slide Latch . . . . . . . . . . . . . . . . . . . . . . . . . . . .
FDDI Cable Connectors . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Recommended Connections for the OBM Cable . . . . . . . . . . . .
Connecting the OBM Cable . . . . . . . . . . . . . . . . . . . . . . . . . . . .

1–2
1–6
1–8
1–9
1–10
2–2
2–3
2–4
2–8
2–10
3–2
3–4
3–6
3–10
3–11
3–12

3–7
4–1
5–1
5–2
A–1
B–1
B–2
B–3
B–4

DECbridge Unit Indicator LEDs After Power Up . . . . . . . . . . .
Access Methods for OBM . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Installing the FDDI Loopback Connectors . . . . . . . . . . . . . . . .
Installing the NI Loopback Connectors . . . . . . . . . . . . . . . . . . .
DECbridge 500/600 Series Modules . . . . . . . . . . . . . . . . . . . . .
Configuration Switches and LED Indicators . . . . . . . . . . . . . . .
Optical Bypass Control Signals . . . . . . . . . . . . . . . . . . . . . . . . .
DECbridge 500/600 Series MIC Receptacle Keying . . . . . . . . .
FDDI Connection Rules Matrix . . . . . . . . . . . . . . . . . . . . . . . . .

3–15
4–2
5–10
5–11
A–5
B–2
B–8
B–9
B–10

LED Indicator Symptoms and Corrective Actions . . . . . . . . . .
DECbridge 500/600 Series Models . . . . . . . . . . . . . . . . . . . . . .
Power Cord Kits . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Configuration Switches . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
LED Indicators . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Physical Specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Electrical Specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Environmental Specifications . . . . . . . . . . . . . . . . . . . . . . . . . .
Acoustic Values . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Cable Specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

5–2
A–2
A–6
B–4
B–5
C–2
C–2
C–2
C–3
C–3

Tables
5–1
A–1
A–2
B–1
B–2
C–1
C–2
C–3
C–4
C–5

vii

Safety

Any warning or caution that appears in this manual is defined as follows:

Warning

Contains information to prevent personal injury.

Caution

Contains information to prevent damage to equipment.

Vorsicht

Enthält Informationen, die beachtet werden müssen, um
den Benutzer vor Schaden zu bewahren.

Achtung

Enthält Informationen, die beachtet werden müssen, um
die Geräte vor Schaden zu bewahren.

Danger

Signale les informations destinées à prévenir les accidents corporels.

Attention

Signale les informations destinées à prévenir la détérioration du matériel.

Aviso

Contiene información para evitar daños personales.

Precaucion

Contiene información para evitar daños al equipo.

The warnings and cautions that must be observed for the hardware described in this manual are listed below in English, German, French, and Spanish. The pages on which these
safety messages appear are also listed.

WARNING

To prevent bodily injury or equipment damage, DO NOT
connect the bridge power cord until instructed. [Page 1-7]

VORSICHT

Schließen Sie das Netzkabel erst an, wenn Sie dazu aufgefordert werden.

DANGER

Afin d’éviter tout risque d’accident corporel, NE RACCORDEZ
PAS le cordon d’alimentation du DECbridge avant d’en avoir
reçu l’instruction.

AVISO

Para evitar daños personales, NO conecte el cable de alimentación del puente hasta que se le indique.

WARNING

When performing any removal or replacement procedures, always remove the ac power cord from the ac power source.
[Page 2-5]

VORSICHT

Ziehen Sie immer zuerst das Netzkabel aus der Steckdose,
wenn Sie Teile austauschen oder entfernen müssen.

DANGER

Au moment de retirer ou de remplacer des composants internes, débranchez toujours le cordon d’alimentation de la
prise.

AVISO

Siempre que se sustituya o se quite algo, saque el cable de
alimentación de corriente alterna de la toma.

WARNING

Some fiber optic equipment can emit laser light that can injure
your eyes. Never look into an optical fiber, cable connector, or
port connector. [Pages 2-6, 3-7]

VORSICHT

Schauen Sie niemals direkt in ein Glasfaserkabel oder einen
Glasfaseranschluß. Die Laserstrahlen in faseroptischen
Geräten können Augenverletzungen verursachen.

DANGER

Certains équipements utilisant les fibres optiques peuvent
émettre des rayonnement laser dangereux pour les yeux. Ne
vous avisez jamais de regarder par l’extrémité d’une fibre
optique ou dans l’ouverture d’un connecteur. Considérez
toujours que le câble est relié à une source lumineuse.

Algunos equipos de fibra óptica emiten radiaciones láser
que pueden dañar la vista. Nunca mire directamente a un
conector o puerta de conector de fibra óptica.

AVISO

CAUTION

Modules in the bridge can be damaged by electrostatic discharges (ESD). When working inside the unit, always use a
grounded wrist strap (ESD strap) and a grounded work surface. A wrist strap, ground wire, and table pad are included
in the field service kit (P/N 29-11762-00). [Page 2-6]

ACHTUNG

Die Module können durch elektrostatische Entladungen
beschädigt werden. Benutzen Sie immer eine antistatische
Gelenkmanschette und eine geerdete Arbeitsunterlage,
wenn Sie am offenen Gerät arbeiten. Der Antistatikkit
für das Wartungspersonal enthält eine antistatische Gelenkmanschette, Schutzleiterdraht und eine Antistatikmatte. Ein Antistatikkit ist bei DECdirekt unter der Bestellnummer 29-11762-00 erhältlich.

ATTENTION

Les charges excessives d’électricité statique peuvent endommager les modules et les composants électroniques.
Lors de la manipulation des modules et des composants
internes, utilisez toujours le bracelet de masse et le plan
de travail antistatique livrés avec le kit d’entretien (Réf.
29-11762-00).

PRECAUCION

Los módulos del puente pueden ser dañados por descargas electroestáticas (ESD). Cuando se trabaje dentro de
la unidad, use una muñequera antiestática y una superficie de trabajo conectadas ambas a tierra. En el juego de
reparación (P/N29-11762-00) se incluye una muñequera
antiestática, un cable de tierra y una tabla.

CAUTION

ACHTUNG

DECbridge 500/600 series modules have components on
both sides of a module. Remove or insert a module straight
(not at an angle) to prevent damage. [Page 2-6]
Auf Modulen der Serie DECbridge 500/600 befinden
sich auf beiden Seiten Bauteile. Entfernen und installieren Sie Module absolut waagrecht, damit sie nicht
beschädigt werden.

ATTENTION

Les cartes du DECbridge 500/600 comportent des composants sur les deux faces. Afin d’éviter tout risque de
détérioration, veillez à respecter l’alignement lors des
opérations de retrait ou de remplacement d’une carte.

PRECAUCION

Los módulos de las series DECbridge 500/600 tienen
componentes a ambos lados. Inserte o retire los módulos
derechos, no en ángulo, para evitar deterioros.

CAUTION

Trying to force a module into the wrong slot may damage
the keys. [Page 2-8]

ACHTUNG

Bringen Sie ein Modul nicht mit Gewalt in einem anderen als dem vorgesehenen Steckschlitz an. Andernfalls
können die Steckzungen beschädigt werden.

ATTENTION

L’insertion forcée d’une carte dans la mauvaise fente
risque d’endommager les guides.

PRECAUCION

Si se fuerza un módulo para que entre en una ranura inadecuada se pueden dañar las llaves.

CAUTION

Ensure that the bend radius of any fiber optic cable is 2.5
centimeters (1 inch) or greater. [Page 3-7]

ACHTUNG

Der Biegungsradius von faseroptischen Kabeln muß
mindestens 2.5 cm betragen.

ATTENTION

Assurez-vous que le rayon de courbure de tout câble à
fibres optiques est égal ou supérieur à 2.5 centimètres.

PRECAUCION

Compruebe que el radio de curvatura de cualquier cable
de fibra óptica es 2.5 centímetros (1 pulgada) o mayor.

CAUTION
ACHTUNG

xii

Do not touch fiber ends; doing so may cause optical power
loss. [Page 3-9]
Berühren Sie keine freiliegenden Faserenden. Andernfalls
können optische Übertragungsverluste auftreten.

ATTENTION

Ne touchez pas aux extrémités des fibres, car cela peut
causer la perte de puissance du signal optique.

PRECAUCION

Evite tocar los extremos de la fibra, porque podría originar pérdida de capacidad óptica.

Be sure to connect the power cord to a grounded wall outlet.
[Page 3-13]

WARNING
VORSICHT

Schließen Sie das Netzkabel nur an eine geerdete Steckdose
an.
Assurez-vous que la prise à laquelle est raccordé le
DECbridge est munie d’une mise à la terre.

DANGER

Asegúrese de conectar el cable de alimentación a una toma
de pared (tierra).

AVISO

WARNING

To prevent personal injury or equipment damage, do not insert telecommunications cabling into the optical bypass relay
connector. (Page 5-8, B-8)

VORSICHT

Um Personen oder Geräteschäden zu vermeiden, dürfen Sie
das Telefonkabel AUF KEINEN FALL am Anschluß des
optischen Bypass-Relais anschließen.

DANGER

Pour éviter tout risque d’accident corporel ou de dommage
matériel, NE BRANCHEZ PAS de câble de télécommunication sur le connecteur de relais sélectif optique (optical
bypass relay connector).

AVISO

Para evitar daños personales o al equipo, NO se debe
introducir cableado de telecomunicaciones en el conector
óptico de relés de derivación.

CAUTION

ACHTUNG

The air inside a rack can be hotter than the ambient room
temperature. Make sure the air entering the bridge does not
exceed the maximum inlet temperature of 50° C (122° F).
[Page C-1]
Die Lufttemperatur im Gehäuse kann beträchtlich höher
sein als die umgebende Raumtemperatur. Achten Sie
darauf, daß die maximale Einlaßtemperatur nicht höher
als 50 Grad Celsius ist.

xiii

ATTENTION

La température de l’air circulant à l’intérieur d’une baie
fermée peut être supérieure à celle de la pièce. Assurezvous que la température à la prise d’air du DECbridge
n’excède pas 50° C.

PRECAUCION

El aire que se encuentra dentro de la carcasa puede estar
más caliente que la temperatura ambiente de la habitación. Asegúrese de que el aire que penetra en el puente
no supera una temperatura máxima de 50 grados
centígrados (122° F).

xiv

Preface

This manual explains how to install or upgrade a DECbridge 500/600 series bridge
and how to verify its operation once installed or upgraded.
If you are installing the bridge, follow the instructions in Chapter 1, then proceed to
Chapter 3 to install communications cabling and verify unit operation. If you are
upgrading the bridge, follow the instructions in Chapter 2, then proceed to Chapter 3
to install communications cabling and verify unit operation.
Intended Audience
This manual is intended for the following audience:

• Hardware installer
• System/network manager
Document Structure
This manual contains five chapters and five appendixes:
Chapter 1

Provides illustrated procedures for installing a DECbridge
unit.

Chapter 2

Provides illustrated procedures for upgrading a DECbridge
unit.

Chapter 3

Provides communications cabling instructions and information to verify proper operation of the bridge.

Chapter 4

Describes the Local Console Manager (LCM). Also describes how to use LCM to access out-of-band management
(OBM).

Chapter 5

Provides general solutions and help in isolating problems
that may occur during installation.

Appendix A

Lists the models in the DECbridge 500/600 Series bridges.
Also includes an overview of the bridge modules.

Appendix B

Provides information on bridge switches and indicators.

Appendix C

Provides specifications on the bridge.

Appendix D

Provides upgrade options information.

Appendix E

Lists related documentation.

The postage-paid Reader’s Comments form on the last page of this document requests your critical evaluation to assist us in preparing future documentation.

xvi

1
Installing the Bridge

This chapter provides instructions for installing the DECbridge 500/600 Series
bridges. After installing a bridge, follow the procedures in Chapter 3 for connecting
communications cables and verifying the unit’s operation. If you are performing an
upgrade to an installed bridge, refer to Chapter 2.

1.1 Introduction
The DECbridge 500/600 Series bridges, also referred to in this manual as the bridges
or units, are FDDI-to-IEEE 802.3/Ethernet-transparent translating bridges. They
provide the interconnection between a high-speed (100-Mb/s) Fiber Distributed
Data Interface (FDDI) network backbone and up to three midspeed (10-Mb/s) IEEE
802.3/Ethernet LAN network segments.
The Single Attachment Station (SAS) version of DECbridge units has one FDDI
connector on the Fiber Interface (FI) module. The Dual Attachment Station (DAS)
version of DECbridge units has two FDDI connectors on the FI module. Figure 1–1
shows components on the bridge.

1–1

Figure 1–1:

A DECbridge 500/600 Series Unit (I/O Panel)

Model number

OBM
connector

Circuit breaker
AC power
connector

Serial
number
Address
label

AUI
connector
(Port 2)

AP
NI
FI

Module
I.D.

ThinWire
connector
(Port 2)

Configuration
switches

FDDI
connector
(Port 1)

LKG-7321-92I

1.1.1 DECbridge 500/600 Series Features

All DECbridge 500/600 Series models share the following features:

•

An AP3 module with out-of-band management (OBM) support (all models
except the DECbridge 500 model)
NOTE
You need Version 1.3 (or higher) bridge firmware if
your unit has an AP3 module.

1–2

•

A Local Console Manager (LCM)

•

Rate limiting

•

Station Management (SMT) support

•

Bridge Management Information Base (Bridge MIB)

•

FDDI MIB

DECbridge 500/600 Series Installation and Upgrade

1.1.2 DECbridge 500 Series Features

The DECbridge 500 Series models have the following features:

•

One-port NI module that provides connection for either a ThinWire or AUI
(also known as thickwire) Ethernet network connection

•

One-port FI module that has one or two connectors, depending on the type of
FDDI interface connection—either a SAS or DAS connection

1.1.3 DECbridge 600 Series Features

The DECbridge 600 Series models have the following features:

•

Three-port NI module that provides for up to three AUI Ethernet network
connections

•

One-port FI module that has zero, one, or two FDDI connectors, depending
on the type of interface connection — either a SAS connection or DAS connection (a DECbridge 600 unit has no FDDI interface)

1.2 Site Verification
Before installing a DECbridge 500/600 Series unit, ensure that all cables for the site
configuration are installed and labeled properly. Refer to the DECconnect System
Fiber Optic Installation manual for information regarding DECconnect System fiber optic installations (refer also to the Fiber Distributed Data Interface Network
Configuration Guidelines manual for FDDI network configuration rules and cableplant specifications). For information regarding satellite equipment room (SER) installations, consult the DECconnect System Satellite Equipment Room Installation
Guide.
The DECbridge 500/600 Series unit can be placed in open office areas and computer
rooms. The environmental requirements (in Appendix C) can assist you in determining the proper location. You can install the bridge on a tabletop, desktop, or in a rack.

Installing the Bridge

1–3

A DECbridge 500/600 Series unit is connected to an FDDI ring through a concentrator (SAS bridge), such as the DECconcentrator 500, or is directly connected using a
DAS bridge. The bridge connects to IEEE 802.3/Ethernet LANs through a transceiver or ThinWire cabling. For more information on FDDI network configurations
and bridge connections, refer to the Fiber Distributed Data Interface Network Configuration Guidelines manual (refer to Appendix E for more documentation information).
1.2.1 Site Verification Checklist

Use the following checklist to make sure a site is ready for installation of the
DECbridge 500/600 Series unit:
 Ensure that a concentrator, such as the DECconcentrator 500, is
installed if you are connecting your bridge to an FDDI ring through
a concentrator.
 Ensure that the AUI or ThinWire cabling is available in the required
length.
 Ensure that the AUI or ThinWire cabling is installed, tested, and
tagged. Tagging is especially important when an NI(3) module is
installed.
 Ensure that the FDDI fiber optic cabling is available in the required
length.
 Ensure that the FDDI fiber optic cabling is installed, tested, and
tagged.
 Ensure that the ac power outlet is grounded and working properly.
The outlet location should be within 1.8 meters (6 feet) of the
installation site for U.S. sites and 2.5 meters (8.2 feet) for
international sites.
 Ensure that the voltage and amperage at the ac wall outlet are correct
for installing the bridge.
 Verify that the temperature, altitude, and humidity for the site are
with in the specified ranges (refer to Appendix C).
 If planning to use LCM, ensure that your video terminal passes
self-test.

1–4

DECbridge 500/600 Series Installation and Upgrade

Ensure that there is a minimum of 7.6 centimeters (3 inches) on the
sides of the unit for ventilation and a minimum of 17.8 centimeters
(7 inches) of vertical mounting space in a rackmount.
 Ensure that the extended LAN is properly configured in regards to
IEEE 802.1d and Digital spanning tree loop detection modes (refer
to the Bridge and Extended LAN Reference manual for more
information).
1.2.2 Service

Optional on-site and remote Digital services are available. Call your Digital Services representative for information regarding hardware and software services that
are available to support your DECbridge 500/600 Series unit.

1.3 Unpacking and Inspecting the Shipping Package
The DECbridge 500/600 Series unit is shipped in one box (see Figure 1–2 for contents). Remove the bridge from the box and place it on a flat surface until you are
ready to install it.
Check the shipment for damage and missing parts. In case of damage, contact your
delivery agent and your Digital sales representative. If parts are missing, contact
your Digital sales representative.
NOTE
Communications cables (ThinWire, AUI, and FDDI)
for this product are ordered and shipped separately, and
are not included in the DECbridge 500/600 Series unit
shipping box. A power cord ships with U.S./Canada
versions of the bridge (for example, DEFEB-AC).
Power cord kits are available from Digital for bridges
shipped to other countries (refer to Appendix A for a list
of power cord kits).

Once you have unpacked the bridge, follow the instructions for setting bridge
switches (if applicable) and installing the unit included in this chapter.

Installing the Bridge

1–5

Figure 1–2:

Shipping Package Contents

Power cord
(U.S. only)
P/N BN20A-2E

Rack U-nuts
P/N 90-07786-00

ThinWire
T-Connector
P/N 12-25869-01
(500 series only)

Mounting bracket
screws
P/N 90-08404-02

T-connector
terminators
P/N 12-26318-01
(500 series only)

Mounting brackets
P/N 74-39897-01

AUI loopback
P/N 12-22196-01
(1 or 3 provided
depending on model)
FDDI loopback
P/N 12-32005-01
(0, 1, or 2 provided
depending on model)
Single-mode loopback
P/N 12-34830-01
(0, 1 or 2 provided
depending on model)

Rack screws
P/N 90-00063-39

License, software
product description,
release notes, Configuring
the SNMP Agent manual
P/N QC-018AA-GZ
DECbridge 500/600 Series
Installation and Upgrade
manual (this manual)
P/N EK-DEFEB-IN
FDDI Network Configuration
Guidelines manual
P/N EK-DFDDI-CG

(DECbridge 510 shown)
LKG-7315-92I

1–6

DECbridge 500/600 Series Installation and Upgrade

1.4 Setting Configuration Switches
A DECbridge 500/600 Series unit is shipped from the factory with the configuration
switches preset in the OFF position (default settings). If you have a DECbridge 500
Series unit, set switch 8 to the proper setting for AUI or ThinWire interface (this
switch does not apply for DECbridge 600 Series units). Otherwise, use the default
settings for normal operation. To perform remote management on the bridge, set the
write access switches on the bridge to ON. Refer to Appendix B for more information on switch settings.

1.5 Automatic Voltage Setting
The DECbridge 500/600 Series units automatically adjust to a voltage range of 88 to
264 Vac. Therefore, the bridges have no voltage-select switch.

1.6 Locations for Installing the DECbridge 500/600 Series Unit
You can install a DECbridge 500/600 Series unit on a tabletop, desktop, or in a standard 48-centimeter (19-inch) rack. The shipping contents include a set of mounting
brackets and screws for use in a rackmount installation (refer to Section 1.6.2). Follow the instructions for the type of installation at your site.
WARNING !
To prevent bodily injury or equipment damage, DO
NOT connect the bridge power cord until instructed.
NOTE
A minimum of 7.6 centimeters (3 inches) of free air
space is required on each side of the unit.
1.6.1 Installing the DECbridge 500/600 Series Unit on a Tabletop or Desktop

To install a DECbridge 500/600 Series unit on a tabletop or desktop, remove it from
the shipping box, remove any packaging, and place it on the surface where you will
use it. After you install the bridge, proceed to Chapter 3 for instructions on installing
communications cables and verifying bridge operation.

Installing the Bridge

1–7

1.6.2 Installing the DECbridge 500/600 Series Unit in a Rackmount

Rackmount installation of the bridge involves installing u-nuts on the rack rails, attaching the mounting brackets to the sides of the bridge, and installing the bridge in
the rack.
NOTE
Two people are required to install the DECbridge
500/600 Series unit in a rack. When positioning the
bridge in the rack, one person should hold the unit while
the other installs the screws.

Before installing the bridge in the rack, determine where the unit will be placed in the
rack and perform the following steps:
1. Attach four u-nuts to the rails of the rack (see Figure 1–3). Hold a mounting
bracket up to the rack rail where it will be positioned when installed. This
helps identify the proper holes for placing the u-nuts.
Figure 1–3:

Installing U-Nuts on Rack

Device

U-nuts

Device

Front of cabinet
LKG-3962-91I

1–8

DECbridge 500/600 Series Installation and Upgrade

2. Attach the mounting brackets (one on each side) to the bridge using the six
flathead screws supplied in the shipping box (see Figure 1–4).
Figure 1–4:

Attaching Mounting Brackets

LKG-4858-93I

Installing the Bridge

1–9

3. Install the bridge in the rack with the I/O panel visible (see Figure 1–5).
Secure the bridge to the rack rail with the four screws provided in the shipping box.
Proceed to Chapter 3 to install communications cables and verify bridge operation.
Figure 1–5:

Installing a Bridge in a Rack

LKG-4859-93I

1–10

DECbridge 500/600 Series Installation and Upgrade

2
Installing a New Module to
Upgrade the Bridge

This chapter provides instructions for upgrading your DECbridge 500/600 Series
unit to another model in the DECbridge 500/600 Series. If you are performing a
bridge installation, follow the installation procedures in Chapter 1. Upgrading your
bridge to another model includes:
1. Replacing the current module(s) in the bridge with upgrade module(s)
2. Installing new model number labels
3. Connecting communications cables and verifying bridge operation by following the procedures in Chapter 3

2.1 Introduction
Upgrading modules on the DECbridge 500/600 Series of bridges allows you to increase interface connections to accommodate growing networks without purchasing
new units.
For DECbridge 500 Series units, you can add two more AUI interface connections.
For both DECbridge 500 and 600 Series units, you can add another FDDI connection
that allows you to use dual homing on your bridge, connect your bridge directly to an
FDDI ring (DAS connection), and connect to networks up to a distance of 40 kilometers (24.8 miles). Refer to Appendix D for more information on upgrade possibilities.

2–1

2.2 DECbridge 500/600 Series Technical Information
The appendixes at the back of this manual contain all technical information pertaining to DECbridge units, such as model numbers, module descriptions, unit specifications, LED indicators, and configuration switches.

2.3 Unpacking and Inspecting Upgrade Kits
Each DECbridge 500/600 Series upgrade kit (Digital offers three kits) is shipped in
its own box. Figure 2–1, Figure 2–2, and Figure 2–3 illustrate the contents of the
shipping boxes.
Check the shipment for damaged or missing parts. If parts are damaged, contact your
delivery agent and your Digital sales representative. If parts are missing, contact
your Digital sales representative.
Figure 2–1:

DEFEB-UP Upgrade Kit Contents
FI DAS multimode module
P/N 54-19369-02

1
G

A PHY 1

B PHY 2

FI multimode loopback connector
P/N 12-32005-01
DECbridge documentation kit
P/N DEFEB-DK
Includes the following:
• DECbridge 500/600 Series
Installation and Upgrade
manual
P/N EK-DEFEB-IN
• Label sheet
P/N 36-35439-01
510

518

520

524

526

528

600

610

618

620

624

626

628

DECbridge 600

LKG-7326-92I

2–2

DECbridge 500/600 Series Installation and Upgrade

Figure 2–2:

DEFEB-UG Upgrade Kit Contents
AP3 module
P/N 54-19375-02
R

2
Y

AUI
G G

NI(3) module
P/N 54-19409-01
R

2
Y G

3
Y G

4
Y G

Two Ethernet (AUI) loopback connectors
P/N 12-22196-01
License, software
product description,
release notes, Configuring
the SNMP Agent manual
P/N QC-018AA-GZ
DECbridge documentation kit
P/N DEFEB-DK
Includes the following:
• DECbridge 500/600 Series
Installation and Upgrade
manual
P/N EK-DEFEB-IN
• Label sheet
P/N 36-35439-01
510

518

520

524

526

528

600

610

618

620

624

626

628

DECbridge 600

LKG-7328-92I

Installing a New Module to Upgrade the Bridge

2–3

Figure 2–3:

DEFEB-UR Upgrade Kit Contents
AP 3module
P/N 54-19375-03
R

2
Y

AUI
G G

License, software
product description,
release notes, Configuring
the SNMP Agent manual
P/N QC-018AA-GZ
DECbridge documentation kit
P/N DEFEB-DK
Includes the following:
• DECbridge 500/600 Series
Installation and Upgrade
manual
P/N EK-DEFEB-IN
• Label sheet
P/N 36-35439-01
510

518

520

524

526

528

600

610

618

620

624

626

628

DECbridge 600

LKG-7318-92I

2.4 Site Verification
Before upgrading the DECbridge 500/600 Series unit, ensure that all cables for the
upgraded site configuration are installed and labeled properly. Refer to the
DECconnect System Fiber Optic Installation manual for information regarding
DECconnect System fiber optic installations. For information regarding SER installations, consult the DECconnect System Satellite Equipment Room Installation
Guide.

2–4

DECbridge 500/600 Series Installation and Upgrade

2.4.1 Site Verification Checklist

Use the following checklist to prepare the site for an upgrade to your DECbridge
500/600 Series unit:
 Ensure that a concentrator, such as the DECconcentrator 500 unit,
is installed if you are connecting to an FDDI ring through a
concentrator.
 Ensure that the AUI or ThinWire cabling is available in the
required length.
 Ensure that the AUI or ThinWire cabling is installed, tested, and
tagged.
 Ensure that the FDDI fiber optic cabling is available in the
required length.
 Ensure that the FDDI fiber optic cabling is installed, tested, and
tagged.
2.4.2 Service

Digital offers optional on-site service agreements. Call your Digital sales representative for information about the hardware and software services that are available for
your DECbridge 500/600 Series unit.

2.5 Preparing the Bridge for Upgrade
You can access the bridge modules from the I/O panel.
WARNING !
When performing any removal or replacement procedures, always remove the ac power cord from the ac
power source.

Before performing upgrade procedures on the bridge, perform the following steps:
1. Remove power to the bridge by unplugging the power cord from the ac
outlet.

Installing a New Module to Upgrade the Bridge

2–5

2. Disconnect the AUI or ThinWire interface cable from the NI module. A slide
latch locks the AUI cable connector locks into place. To remove the AUI
cable, push the slide latch to the right to unlock the connector. To remove the
ThinWire cable, push in and rotate the connector a quarter-turn counterclockwise.
WARNING !
Some fiber optic equipment can emit laser light that can
injure your eyes. Never look into an optical fiber, cable
connector, or port connector.

3. Remove the fiber optic cable from the FI module. If you have a protective
cover, place it on the fiber optic connector to protect it against dust.

2.6 Tools Required
You need a #2 Phillips-head screwdriver and an electrostatic discharge (ESD) strap
to remove and replace modules.
CAUTION !
Modules in the bridge can be damaged by electrostatic
discharges (ESD). When replacing modules in the unit,
always use a grounded wrist strap (ESD strap) and a
grounded work surface. A wrist strap, ground wire, and
table pad are included in the field service kit (P/N
29-11762-00).

2.7 Removing a DECbridge Module
To remove a module, refer to Figure 2–4 and perform the following steps:
CAUTION !
DECbridge 500/600 Series modules have components
on both sides of a module. Remove or insert a module
straight (not at an angle) to prevent damage.

1. Using network management software, record bridge parameter settings and
the firmware version.

2–6

DECbridge 500/600 Series Installation and Upgrade

2. Before removing an AP module, record the existing switch settings on that
module so that they can be used as reference to configure the new AP3 module.
3. Ensure the power is turned off and interface cables are disconnected (refer to
Section 2.5).
4. Attach the ESD ground strap around your wrist and clip the other end of the
strap to the ejector lever on a module you are not removing, such as the QM
module.
5. Using a #2 Phillips-head screwdriver, loosen the quarter-turn fastener on each
end of the module by pushing it in and turning it a quarter turn counterclockwise. The fastener pops out when unlocked.
6. Swing the two ejector levers on the module to the unlock (outward) position.
7. Carefully slide the module straight out of the card cage to remove it. Do not
let the components on the bottom of the module scrape against the ejector
levers of the module below.

Installing a New Module to Upgrade the Bridge

2–7

Figure 2–4:

Module Removal and Replacement

Quarter-turn
Quarter-turn
fastener (2)

AP module
NI module

Ejector
lever (2)

FI module
QM module

Locked

Unlocked

LKG-7323-92I

2.7.1

Installing a DECbridge 500/600 Series Module
Follow this procedure for any of the modules. Verify that you have the correct replacement module by checking the name of that module on the left side of the module
handle. (The revision level is shown on the right side of the handle.) The card cage
slots are also labeled, as shown in Figure 2–4. Each module is keyed so that it can
lock into place only if it is in the proper slot.
CAUTION !

Trying to force a module into the wrong slot may
damage the keys.

2–8

DECbridge 500/600 Series Installation and Upgrade

NOTE
Ensure that the switches on a replacement AP3 module
are set to the proper positions for the new configuration.
Refer to Appendix B for switch descriptions.
NOTE
Because the AP module contains the address ROM for
the bridge, the physical addresses of the bridge change
when you replace the AP module. An address label on
the new AP3 module lists the new addresses.

To install a module, refer to Figure 2–4 and perform the following steps:
1. Verify that the replacement module is correct (the name is on the left side of
the module handle).
2. Verify that the module ejector levers are in the unlock position (swung outward). Hold the replacement module component side up and carefully slide it
into the appropriate card cage slot until it makes contact with the backplane
connector. Do not let the components on the bottom of the module scrape
against the ejector levers of the module below it.
3. Firmly push the ejector levers inward until the module is fully seated into the
connector. (Note that when all modules are properly inserted, all the ejector
levers should be aligned.)
4. Using the Phillips-head screwdriver, tighten the two quarter-turn fasteners
that attach the module to the card cage (by pushing in and turning the screwdriver clockwise).

2.8 Updating Labels
Update the labels that appear on the outside of the bridge once you have completed
the module upgrade. A peel-and-stick label sheet is provided in the shipping package. Replace two labels:
1. If an NI(3) module has been installed, peel the DECbridge front panel label
from the label sheet (located on the bottom right side of the sheet) and place
it directly over (covering) the DECbridge model number located on the front
panel of the unit (see Figure 2–5). Line up the new DECbridge label with the
top of the existing label and press firmly so that the label stays in place.

Installing a New Module to Upgrade the Bridge

2–9

2. Peel the specific DECbridge model number from the label sheet and place it
directly over (covering) the DECbridge model number located on the I/O
panel (see Figure 2–5). Press firmly so that the label stays in place.
3. Once the two labels have been updated, use a pen or permanent marker to
update the DEFEB part number (located on the I/O panel serial number label)
to the model you are upgrading to. Cross out the last two digits of the part
number and write the new numbers to the right of the crossed-out numbers.
For example, if you have model DEFEB-AC (DECbridge 510) and are upgrading to model DEFEB-LA (DECbridge 620), cross out the letters AC and
write in letters LA. Refer to Appendix A for a list of model numbers.
The DECbridge 500/600 Series unit is now ready for cabling. Refer to Chapter 3 for
cabling instructions.
Figure 2–5:

Locations for Applying Upgrade Labels
Label sheet
510

518

520

524

526

528

600

610

618

620

624

626

628

DECbridge 600

Front panel label

Specific model number

DECbridge 600

AP
NI
FI
QM

I/O Panel

Front panel
LKG-7320-92I

2–10

DECbridge 500/600 Series Installation and Upgrade

3
Connecting Communications Cables
and Verifying Bridge Operation

This chapter provides instructions for connecting communications cables and verifying proper bridge operation.

3.1 Introduction
To connect communications cables, follow the instructions in the following sections
for the cables you are connecting:

•

Connecting the ThinWire Cable — Section 3.2

•

Connecting the AUI Cable — Section 3.3

•

Connecting the FDDI Cable — Section 3.4

•

Connecting the OBM Cable — Section 3.5
NOTE
Verify that the site is prepared for cable installation. Refer to the site verification checklist in Chapter 1 for
more information on site requirements.

3–1

NOTE
When connecting communications cables, verify that
you are connecting the correct cable to the proper connector on the I/O panel by reading the label and noting
the type of connector on the cable.

If you have a DECbridge 600 Series unit, the NI module has three AUI connectors
and no ThinWire connector (Port 2). If you have a DAS configuration, the FI module
has two FDDI connectors (Port 1). Figure 3–1 shows connector locations on the I/O
panel for all cables.
Figure 3–1:

ThinWire, AUI, FDDI, and OBM Connectors
ThinWire
connector
OBM connector

AUI
connector

AP
NI
FI

FDDI

LKG-7319-92I

3.2 Connecting the ThinWire Cable
The ThinWire connector on the bridge (models in the DECbridge 500 Series) is located on the NI module. To install the ThinWire cable, determine whether your
bridge is installed in the middle of a ThinWire segment or at the end of a segment and
follow the procedures in Section 3.2.1 (for the middle of a segment) or Section 3.2.2
(for the end of a segment).

3–2

DECbridge 500/600 Series Installation and Upgrade

3.2.1 Connecting to the Middle of a ThinWire Segment

To connect the DECbridge 500/600 Series unit to the middle of a ThinWire segment,
perform the following steps:
1. Set configuration switch 8 on the AP module to OFF. This selects the
ThinWire connection for Port 2. Refer to Appendix B for more switch information.
2. Locate the T-connector supplied in the shipping package and install it on the
NI module connector. Push down and turn the collar on the cable connector a
quarter turn clockwise to secure the connector in place.
3. Attach both ThinWire cables to the T-connector. Note the alignment slots on
the end of the cable connector and align them with the tabs on the T-connector. Secure the connection for each cable by turning the collar on the connector a quarter turn.
4. Verify that the other ends of these cables are properly terminated (connected
to a terminator, Digital Multiport Repeater (DEMPR), or equivalent device).
If it is not connected, refer to the appropriate device documentation for connection information.
3.2.2 Connecting to the End of a ThinWire Segment

To connect the DECbridge 500/600 Series unit to the end of a ThinWire segment,
perform the following steps:
1. Set configuration switch 8 on the AP module to OFF. This selects the
ThinWire connection for Port 2. Refer to Appendix B for more switch information.
2. Remove and save the terminator from the T-connector attached to the last station on the existing ThinWire segment.
3. Attach one end of the new ThinWire cable to the T-connector on the last station. Attach the other end of the cable to the T-connector for your bridge
(supplied in the shipping package).
4. Attach the 50-ohm terminator to the T-connector on your bridge (see
Figure 3–2). Note the alignment slots on the end of the cable connector and
align them with the tabs on the T-connector. Secure the connection by turning the collar on the connector a quarter turn.

Connecting Communications Cables
and Verifying Bridge Operation

3–3

5. Install the ThinWire cable (with T-connector) onto the NI module connector.
Push down and turn the collar on the cable connector a quarter turn clockwise
to secure the cable in place. Your unit is now the last station on the ThinWire
segment.
Figure 3–2:

ThinWire Cable Connector

NI
board

ThinWire
cable

Tabs
Collar
Slots
LKG-4861-93I

3.3 Connecting the AUI Cable
The NI module has the AUI connector(s) for a DECbridge 500/600 Series unit (see
Figure 3–1). If you have a DECbridge 600 Series unit, the NI module has three AUI
connectors and no ThinWire connector.

3–4

DECbridge 500/600 Series Installation and Upgrade

To install the AUI cable(s):
1. For DECbridge 500 Series units with one AUI connector on the NI module,
verify that switch 8 on the AP module is set to ON to select AUI interface
for Port 2. For DECbridge 600 Series units with three AUI connectors on the
NI(3) module, switch 8 does not apply. Refer to Appendix B for more switch
information.
2. Push the AUI connector slide latch on the NI module to the right to unlock
the latch.
3. Plug the AUI cable connector into the AUI connector on the NI module (see
Figure 3–3).
NOTE
The AUI cable connector can be installed in only one
position. Check the alignment of the AUI connector before plugging in the cable.

4. Push the slide latch to the left until it snaps into the locking position, securing
the connector.

Connecting Communications Cables
and Verifying Bridge Operation

3–5

Figure 3–3:

AUI Connector Slide Latch

AUI
connector

Push slide latch
firmly to left
to lock cables
in place.

LKG-4862-93I

5. Verify that the other end of this cable is connected to an H4000, H4005, or
equivalent transceiver. If it is not connected, refer to the appropriate device
documentation for connection information.
6. Repeat steps 2 through 5 for each AUI cable/connector. All AUI cableconnections are complete.
If you are connecting the bridge to an FDDI network, proceed to Section 3.4
to install the FDDI fiber cable. If you do not have an FDDI interface (Model
600), all cables to the DECbridge unit, except the ac power cord, are now
installed. Proceed to Section 3.6 for power-cord installation and unit-verification procedures.

3–6

DECbridge 500/600 Series Installation and Upgrade

3.4 Connecting the FDDI Cable
The DECbridge 500/600 Series units have zero (null), one, or two FDDI connectors,
depending on the model. The connectors are located on the FI module (see
Figure 3–1). A single connector (SAS version of the bridge; S-type connector) is
called Port 1. Two connectors (DAS version of the bridge) are called Port 1, connector type A (Port 1 [A]) and Port 1, connector type B (Port 1 [B]) (see Figure 3–4).
The connector interface types are multimode, single-mode, or a combination of multimode and single-mode. Appendix B contains FDDI connector keying guidelines.
WARNING !
Some fiber optic equipment can emit laser light that can
injure your eyes. Never look into an optical fiber, cable
connector, or port connector.
CAUTION !
Ensure that the bend radius of any fiber optic cable is 2.5
centimeters (1 inch) or greater.
NOTE
Digital recommends you use Digital’s multimode
FDDI-to-FDDI patch cables (BN24B-nn) or FDDIto-2.5-mm ST-type connector patch cables (BN24Dnn) for multimode connections.
NOTE
The FDDI multimode connector receptacles are keyed.
Determine proper alignment of the connectors before
attempting cable installation. Refer to Appendix B for
more information on connector keying.
3.4.1 Connecting an FDDI Cable with a Multimode Connector

To install an FDDI cable with a multimode connector:
1. Remove the protective device from the FDDI connector receptacle by
squeezing the locking clips on the sides of the insert and pulling it out (see
Figure 3–4).

Connecting Communications Cables
and Verifying Bridge Operation

3–7

2. Insert the FDDI cable connector into the module receptacle (with proper keying), ensuring the locking clips on the sides snap into the locked position (see
Figure 3–4).
3. Verify that the other end of this cable is connected to the concentrator (such
as the DECconcentrator 500 unit) if you are connecting to the dual ring
through a concentrator. If it is not connected, refer to the appropriate concentrator manual or the Fiber Distributed Data Interface Network Configuration
Guidelines manual for connection information.
NOTE
A DECbridge unit can be cabled to a patch panel first
but must then be cabled from the panel to the appropriate concentrator or connected directly to an FDDI ring
to complete proper connection of the bridge.
3.4.1.1

Installing the Optical Bypass Switch

If you are installing a DAS multimode bridge and you are using the optical bypass
feature, refer to the installation instructions included with the optical bypass switch
to install the switch.
All cables to the DECbridge unit, except the ac power cord, are now installed. Proceed to Section 3.6 to install the power cord and verify unit operation.

3–8

DECbridge 500/600 Series Installation and Upgrade

3.4.2 Connecting an FDDI Cable with a Single-mode Connector

To install an FDDI cable with a single-mode connector:
1. Remove the two protective caps from the FDDI connectors on the FI module
and from the end of the FDDI cable by turning them counterclockwise (see
Figure 3–4).
CAUTION !
Do not touch fiber ends; doing so may cause optical
power loss.

2. Connect the fiber optic cable to the appropriate connectors and secure them
by turning the collar on each connector clockwise. Transmit and receive
icons are marked on the handle of single-mode connectors (see Figure 3–4).
3. Verify that the other end of this cable is connected to a concentrator, such as
the DECconcentrator 500 unit or connected to the dual ring. If it is not connected, refer to the appropriate concentrator manual or the Fiber Distributed
Data Interface Network Configuration Guidelines manual for connection information.

Connecting Communications Cables
and Verifying Bridge Operation

3–9

Figure 3–4:

FDDI Cable Connectors

Port 1 (B)

Port 1 (A)

Multimode connector

Single-mode connectors
LKG-4864-93I

3–10

DECbridge 500/600 Series Installation and Upgrade

3.5 Connecting the OBM Cable
You need to install the Out of Band Management (OBM) cable when you want to use
LCM and OBM. You can connect the OBM cable either directly to a terminal or
through a Scholar modem (or equivalent device). You do not need this cable for normal unit operation. If you do not intend to use LCM and OBM, proceed to Section
3.6. Refer to Chapter 4 for information on using LCM.
Recommended cables and passive adapters are provided in the following list and
shown in Figure 3–5.

•

For VT100 or VT200 Series — Digital recommends using P/N BC22Dxx cables with 25-pin connectors at each end. If you use P/N BC16E-xx
cables, use a passive adapter (P/N H8575A) at each end of the cable.

•

For VT300 or VT400 Series — Digital recommends using the standard
six-pin modular jack (MJ6) connector cable P/N BC16E-xx. Use the passive adapter H8575A on the bridge end of the cable.

Figure 3–5:

Recommended Connections for the OBM Cable

BC22D

H8575A

BC16E

BC22E

H8575A

VT100
or
VT200

VT300
or
VT400

Modem

LKG-7314-92I

Connecting Communications Cables
and Verifying Bridge Operation

3–11

3.5.1 Connecting the OBM Cable Directly to a Terminal

To connect the OBM cable directly to a terminal, perform the following steps:
1. Connect one end of the cable between the terminal and bridge to the 25-pin
OBM connector on the AP3 module (see Figure 3–6). Secure the connector
by tightening the screws on both sides of the connector.
2. Connect the other end of the cable to the terminal.
Figure 3–6:

Connecting the OBM Cable

OBM
connector

LKG-7409-92I

3.5.2 Connecting the OBM Cable Through a Modem to a Terminal

To connect the OBM cable through a modem to a terminal, perform the following
steps:
1. Connect the cable between the modem and bridge to the 25-pin OBM connector on the AP3 module (see Figure 3–6). Secure the connector to the port
by tightening the screws on both sides of the connector.

3–12

DECbridge 500/600 Series Installation and Upgrade

2. Connect the other end of the cable to the modem.
3. Ensure that the remote modem is connected to the terminal.
4. Ensure that both modems are connected to the telephone network.
All cables to the DECbridge unit, except the ac power cord, are now installed. Proceed to Section 3.6 to install the power cord and verify unit operation.

3.6 Verifying Bridge Operation
Verifying the bridge operation after installation or upgrade consists of powering up
the bridge and observing the LED indicators. If the LEDs indicate a normal condition, your unit is working properly. If the LEDs indicate a problem, refer to the problem-solving procedures in Chapter 5.
All communications cables should now be installed. If not, refer to the appropriate
cable installation instructions (for your configuration) in this chapter.
NOTE
The DECbridge 500/600 Series units do not have a power ON/OFF switch. When the power cord is plugged in,
power is applied directly to the bridge.
3.6.1

Powering Up
When the power cord is first plugged in, all of the bridge LED indicators light for a
2-second lamp check. The bridge then performs internal self-test to verify that the
unit is operating properly. The indicator LEDs turn on and off during this testing,
according to the internal testing sequence.
Be prepared to observe the LEDs on the I/O panel when plugging in the power cord
to ensure the unit is working properly.
To connect the bridge power cord, perform the following:
WARNING !
Be sure to connect the power cord to a grounded wall
outlet.

1. Connect one end of the bridge power cord into the DECbridge unit ac power
connector (see Figure 3–7).

Connecting Communications Cables
and Verifying Bridge Operation

3–13

2. Connect the other end of the power cord into the ac wall outlet.
3. Observe the indicator LEDs and, once testing is complete (about 1 minute),
compare the LEDs to those shown in Figure 3–7. The following LED states
should appear and indicate that the unit is working properly:
NOTE
Wait until testing is complete before viewing the LEDs.
FWD LEDs take longer to light than the other LEDs.

•

No LEDs are lit RED. A red LED indicates an error condition.

•

MODE on the AP3 module is ON (SOLID GREEN).

•

DC_OK on the AP3 module is ON (SOLID GREEN).

•

EXT_PWR on the NI or NI(3) module is ON (SOLID GREEN).

•

FWD2 (also FWD3 and FWD4 if applicable) on the NI or NI(3) module
is ON (solid green). If a port is in backup state, the LED remains OFF.

•

AUI_SELECT on the NI module is ON (SOLID GREEN) for
DECbridge 500 Series units if configuration switch 8 is selected to ON
(AUI connection to network), or the LED is OFF if configuration switch
8 is selected to OFF (ThinWire connection to network). There is no
AUI_SELECT LED for DECbridge 600 Series units (NI(3) module is
installed).

•

FWD1 on the SAS and DAS versions of the FI module is ON (SOLID
GREEN). If the port is in backup state, the LED remains OFF.

•

PHY (on FI module) for Port 1 on SAS versions of the bridge and PHY
1 for Port 1 (A) and PHY 2 for Port 1 (B) on DAS versions of the
bridge blinks GREEN until fiber interface connection is made and then
turns ON (SOLID GREEN).

•

ACT2 (also ACT3 and ACT4 if applicable) on the NI or NI(3) module
and ACT1 on the SAS and DAS versions of the FI module flash ON
and OFF (YELLOW) as packets are transmitted and received.

•

If the bridge is in a dual homing configuration, PHY1 blinks GREEN
and RED.

If the LEDs do not match (another condition appears), refer to the troubleshooting
procedures in Chapter 5.

3–14

DECbridge 500/600 Series Installation and Upgrade

Figure 3–7:

DECbridge Unit Indicator LEDs After Power Up

AC power
connector

AP
NI
FI
QM

LED Indicators
AP3
NI

AUI

NI(3)

Null
FI

SAS

DAS

PHY 1

A PHY 1

B PHY 2

Legend
– On
– Off

– Flashing
– On or Off
LKG-7331-92I

Connecting Communications Cables
and Verifying Bridge Operation

3–15

3.7 Checking the Logical Link
To check the logical link, connect a host station on one side of the bridge to a host
station on the other side of the bridge. On a VMS host running DECnet, use the SET
HOST command. On an ULTRIX/UNIX host, use the rlogin command. In a
TCP/IP environment, ping a station on the other side of the bridge. On an MS-DOS,
Windows NT, or OS/2 PC running Novell NetWare as a network client, use the slist
command. If you have problems connecting, refer to Chapter 5 for additional information.

3.8 Final Procedures
Before leaving the site, perform the following:
1. Have the system/network manager record and save address information about
the bridge (bridge location and bridge addresses). This information is helpful
should a network problem occur.
2. Have the system/network manager record the current bridge parameters using
your Network Management Software (NMS) and save them for future reference. When configuration switch 2 (Restore Default Parameters) is selected
to ON, current bridge parameters are discarded and default bridge parameters
are restored on power up. Refer to your network management software
(NMS) manual for more information on retrieving current parameters from
the bridge.
3. If you performed an upgrade of the AP module, remember to load previously
saved parameters.
4. Dress the cables in a rackmount by using the guidelines supplied in the
DECconnect System Fiber Optic Installation manual.
5. Verify that the site is clean. Remove or store all boxes and packaging materials.
6. Verify that all paperwork is completed.
Installation or upgrade of the DECbridge unit is now complete.

3–16

DECbridge 500/600 Series Installation and Upgrade

4
Using Local Console Management

This chapter describes Local Console Management (LCM) and shows how to access
and display the LCM menu. It also explains how to use LCM to set attributes in the
bridge, and how to change from the LCM interface to the Serial Line Internet Protocol (SLIP) interface to use network management software (NMS) for full bridge
management. Any SNMP-compliant NMS which supports a SLIP connection can
be used for full out-of-band management of the bridge.

4.1 Introduction
LCM is a terminal-based facility that allows limited management of the DECbridge
500/600 Series units. It requires no special management station or software. You can
connect a terminal directly to the 25-pin OBM connector on the AP3 board or
through a Scholar modem (or equivalent device). If your personal computer (PC)
has terminal emulation, you can access LCM by connecting the PC directly to the
OBM port.
NOTE
Using LCM is optional and is not necessary for the operation of the bridge.

You can also use the OBM port for full NMS bridge management. In this mode of
operation, an SNMP network management system can communicate with the unit by
using SLIP. This allows full management of the unit through a communication channel that is separate from the FDDI and NI data channels. To enter this mode of operation from LCM, use the SET SLIP MODE option on the LCM screen. Alternately, if
LCM receives a SLIP packet (at the correct baud rate), the OBM port switches to
SLIP MODE. Figure 4–1 shows the modes of operation and access methods for
OBM.

4–1

Figure 4–1:

Access Methods for OBM

OBM
ASCII
Interface

LCM

SLIP
Interface

NMS
LKG-8041-93I

4.2 Accessing LCM
To access LCM, first connect a terminal to the bridge. Then, perform the following
steps:
1. Set your terminal to a 9600-baud rate and 8 bits/no parity/1stop bit.
2. Ensure one end of the terminal or modem cable is connected to the 25-pin
connector on the AP3 module.
3. Power up the bridge. After completing bridge self-test (about 1 minute), the
terminal displays the LCM Menu (see Example 4–1). If the screen does not
display the LCM menu, press RET .

4–2

DECbridge 500/600 Series Installation and Upgrade

Example 4–1: Displaying the LCM Screen

DECbridge 500 Series
Local Console Management

IP Address:

16.21.16.128

Trap Address Table: 16.21.16.200
16.21.16.225
0.0.0.0
0.0.0.0
Seconds Operating: 215
FDDI Frame Count:
FDDI Error Count:
FDDI Ring Inits:

65237176
0
1

Set SLIP mode:

off

V1.3

Default Gateway Address:

16.21.16.227

0.0.0.0
0.0.0.0
0.0.0.0
0.0.0.0
Number of Resets:

Current Baud Rate: 9600
Power-up Baud Rate: 9600
CTRL-R To Refresh Screen
>IP Address: Enter new value or 0 to delete

4.2.1 Attributes Displayed When Using LCM

The LCM screen displays attributes and system messages. When you power up the
bridge for the first time, the IP Address field, the Default Gateway Address field , and
the Trap Address Table display all zeros. After you set the values, the screen displays
set values when you recycle power. Refer to Section 4.4 for information on setting
attribute values.
The screen displays the following attributes:

•

IP Address — The bridge’s Internet Protocol address.

•

Default Gateway Address — The Internet address of the default IP gateway
for the bridge.

Using Local Console Management

4–3

•

Trap Address Table — Displays the addresses to which the bridge sends
SNMP traps. It displays up to eight trap addresses. When you enter a value
into one of the eight fields, the screen displays the value in the first available
field that contains a zero value.

•

Seconds Operating — Number of seconds since the bridge was reset (read
only).

•

Number of Resets — Number of times the device has reset due to one or
more of the following conditions (read only):
–

Power up

–

Internal reset due to an error condition

–

Command from network management

•

FDDI Frame Count — Total number of FDDI frames received on the line,
including those frames that were stripped from the ring and those that were
merely repeated (read only).

•

FDDI Error Count — Number of error frames detected by the line; that is, the
number of times the FDDI MAC entity changed the E (error detected) field in
a frame from R to S (set). This total does not include error frames that were
previously detected by other stations on the ring (read only).

•

FDDI Ring Initializations — The number of times the FDDI MAC entity attempted to connect to the logical ring (read only).

•

Set SLIP MODE — Allows you to change from LCM to SLIP MODE to use
NMS.
NOTE
Once you set SLIP MODE, you can return to LCM only
by resetting the bridge through management or powering the bridge down and bringing it up again.

4–4

•

Current Baud Rate — Allows you to set the currently active baud rate of the
serial port. If you change this parameter, you must also change the terminal
baud rate.

•

Initial Baud Rate — Allows you to set the initial baud rate of the serial port
when it is powered up or reset.

DECbridge 500/600 Series Installation and Upgrade

4.3 Messages Displayed
The following messages are displayed:

•

CTRL/R

to Refresh Screen – Special key definition that allows you to re-

fresh the screen. Pressing CTRL/W also refreshes the screen.

•

System messages appear at the bottom of the screen.

4.4 Setting the Attribute Values
When you power up the DECbridge 500/600 Series unit, the cursor appears in the
Internet Protocol (IP) Address field. To change the attributes on the LCM screen,
perform the following steps:
1. Move the cursor to the desired attribute field:
–

To move to the next field, press the down arrow key or the right arrow
key on the keypad or press RET .

–

To move to the previous field, press the up arrow key or the left arrow
key on the keypad.

2. Enter the data. If you enter incorrect data, press

DEL

to erase it.

3. When the data in the field is correct, press RET . The screen displays the
new data in the field (and updates NVRAM). If you enter invalid data, an
error message appears at the bottom of the screen.
When you move the cursor through the attribute fields, it skips read-only fields.
These fields automatically update every five seconds.

4.5 Switching from LCM to SLIP MODE
When you select SET SLIP MODE, the screen prompts you to ensure that you want
to switch to this mode. Once you switch to SLIP MODE, you can return to LCM only
by recycling bridge power or resetting the bridge through management.

Using Local Console Management

4–5

To switch to SLIP MODE, perform the following steps:
1. Move the cursor to the SET SLIP MODE option on the screen. The field
displays OFF.
2. Type ON, and press RET . The screen prompts you, ‘‘Are you sure you
want to switch to SLIP?”
3. Enter Y on the keyboard.
4. Disconnect the cable from the terminal to the bridge.
5. Connect the cable from the network management station to the bridge.
NOTE
If a SLIP packet arrives at the OBM port (in LCM
mode), it automatically switches to SLIP MODE. Some
packets may be lost in the switchover. Baud rates must
be the same value for SLIP MODE and LCM.

4–6

DECbridge 500/600 Series Installation and Upgrade

5
Solving Problems

This chapter helps identify and correct problems you may have installing or upgrading the DECbridge 500/600 Series unit. The troubleshooting procedures provided
are for diagnosing and correcting hardware-related problems only. After diagnosing
and correcting a problem, return to Chapter 3 to verify that the unit is operating properly.
NOTE
Notify the system/network manager if the troubleshooting procedures indicate a problem related to the software or if the basic troubleshooting procedures do not
correct the problem.
NOTE
You must use DECbridge firmware version 1.3 or higher when an AP3 module is installed in your bridge.

5.1 Basic Troubleshooting
The bridge LEDs show the status of the unit and help diagnose problems. After
powering up and allowing time for the bridge to perform diagnostic testing, the
LEDs indicate whether the unit is functioning properly.

5–1

When the self-test diagnostics detect a failure in the bridge (or you suspect a failure),
rerun self-test to verify that the failure can be repeated. You can run self-test locally
by unplugging the ac power cord and plugging it back in (recycles power and starts
self-test).
5.1.1 Determining Symptoms and Following Corrective Actions

After determining the symptom of a problem, find the symptom listed in Table 5–1
and follow the steps for corrective action. After taking corrective actions, return to
Chapter 3 and verify proper bridge operation. If the problem is still not resolved,
refer to the DECbridge 500/600 Series Problem Solving manual for additional help.
If the problem exists after further troubleshooting, call your Digital Services representative.
Table 5–1:
Symptoms

LED Indicator Symptoms and Corrective Actions
Corrective Action

General
All LEDs off.

Verify that the ac power cord is plugged in correctly at the ac
connector on the bridge and the ac wall outlet.
Verify that the ac wall outlet is working properly and is of the
correct voltage.
Determine whether the bridge’s circuit breaker has tripped. If
it has, press in the white center portion of the breaker to reset
it. If the circuit breaker trips more than once, notify the system/
network manager.
Check that the bridge’s configuration switches are set correctly.
Refer to Appendix B for switch descriptions.
Ensure that the fans are running. If they are not, an overtemperature condition may have induced a logic module failure or a
power-supply problem.
Make sure all modules are installed properly, all ejectors secured, and all screws tightened.
Consider possible environmental problems such as power fluctuations, high ambient temperature, interference from other
equipment, and so on.

5–2

DECbridge 500/600 Series Installation and Upgrade

Table 5–1 (Cont.): LED Indicator Symptoms and Corrective Actions
Symptoms

Corrective Action

All LEDs remain on.

Verify that all modules are installed properly into the backplane
connectors. Retry power-up procedures.

All FRU_BAD LEDs are Improper upgrade of modules. Contact Digital Services for
blinking.
information on upgrades.
A logical link cannot
be created.

Verify that all cables are installed and connected properly.
Check switch settings.
Verify that the node at the other end of the link is working.

AP Module LEDs
AP BAD remains on.

Self-test failed. Retry bridge self-test.
Incompatible firmware loaded. Call Digital Services to replace
the AP3 module.

AP BAD blinking.

Incompatible firmware loaded. Call the system/network
manager.
Do not load the AP3 module with a previous version of firmware
lower than Version 1.3. Call Digital Services to upgrade the
incompatible module.

NI Module LEDs
NI BAD remains on.

Self-test failed. Retry bridge self-test. Call Digital Services to
replace the NI module.

FWD2 blinking.

Port 2 (AUI/ThinWire) in broken state.
Check cable
connections. If cable connections are not the problem, perform
the loopback test in this chapter.

EXT PWR OK
remains off.

Transceiver power failure. Check cable connections. Check
cables for possible faulty wiring (shorts).

Solving Problems

5–3

Table 5–1 (Cont.): LED Indicator Symptoms and Corrective Actions
Symptoms

Corrective Action

NI BAD blinking.

Incompatible firmware loaded.
manager.

Call the system/network

Do not load the AP3 module with a previous version of firmware
lower than Version 1.3. Call Digital Services to upgrade the
incompatible module.
NI(3) Module LEDs

5–4

NI BAD remains on.

Self-test failed. Retry bridge self-test. Call Digital Services to
replace the module.

FWD2 blinking.

Port 2 (AUI) in broken state. Check cable connections. If cable
connections are not the problem, perform the loopback test in
this chapter.

FWD3 blinking.

Port 3 (AUI) in broken state. Check cable connections. If cable
connections are not the problem, perform the loopback test in
this chapter.

FWD4 blinking.

Port 4 (AUI) in broken state. Check cable connections. If cable
connections are not the problem, perform the loopback test in
this chapter.

EXT PWR OK
remains off.

Transceiver power failure. Check cable connections. Check
cables for possible faulty wiring (shorts).

NI BAD blinking.

Incompatible firmware loaded. Call Digital Services to upgrade
the incompatible module.

DECbridge 500/600 Series Installation and Upgrade

Table 5–1 (Cont.): LED Indicator Symptoms and Corrective Actions
Symptoms

Corrective Action

SAS FI Module LEDs
FI BAD
remains on.

Self-test failed. Retry bridge self-test. Call Digital Services to
replace the module.

FI BAD blinking.

FWD1 blinking.

Port 1 (FDDI) in broken state. Check all cable connections. If
cable connections are not the problem, perform the loopback
test in this chapter.

PHY 1 blinking
(red).

Illegal topology. Check the configuraton setup and verify proper
connections and cabling. Also notify the system manager.

PHY 1 ON (red)
(and FI BAD LED on).

Port broken. Perform the loopback test in this chapter.
If connection is OK with loopback test, check for cable problems
at FDDI port or at other end of cable.

PHY 1 ON (red)
(and FI BAD LED off).

Solving Problems

Port failed Line Confidence Test. Perform the loopback test in
this chapter.

5–5

Table 5–1 (Cont.): LED Indicator Symptoms and Corrective Actions
Symptoms

Corrective Action

DAS FI Module LEDs
FI BAD remains on.

Self-test failed. Retry bridge self-test. Call Digital Services to
replace the module.

FI BAD blinking.

Incompatible firmware loaded. Call the system/network
manager.
Do not load the AP3 module with a previous version of firmware
less than Version 1.3. Call Digital Services to upgrade the
incompatible module.

FWD1 blinking.

Port 1 (FDDI) in broken state. Check all cable connections. If
cable connections are not the problem, perform the loopback
test in this chapter.

PHY 1 blinking (red).

Illegal topology. Check the configuraton setup and verify proper
connections and cabling. Also notify the system manager.
Check that the loopback connector is removed and the FDDI
cable is installed properly.

PHY 1 blinking
(red/green).

Port is in standby mode as part of a dual-homed configuration.
No corrective action is required.
Check that the loopback connector is removed and the FDDI
cable is installed properly.

PHY 1 on (red)
(and FI BAD on).

Port broken. Perform the loopback test in this chapter.
If connection is OK with loopback test, check for cable problems
at FDDI port or at other end of cable.

PHY 1 on (red)
(and FI BAD off).

5–6

Port failed Line Confidence Test. Perform the loopback test in
this chapter.

DECbridge 500/600 Series Installation and Upgrade

Table 5–1 (Cont.): LED Indicator Symptoms and Corrective Actions
Symptoms

Corrective Action

PHY 2 blinking (red).

PHY 2 ON (red)
(and FI BAD on).

Port broken. Perform the loopback test in this chapter.
If connection is OK with loopback test, check for cable problems
at FDDI port or at other end of cable.

PHY 2 ON (red)
(and FI BAD off).

Port failed Line Confidence Test. Perform the loopback test in
this chapter.

Null FI Module LEDs
FI BAD remains on.

Self-test failed. Retry bridge self-test. Call Digital Services to
replace the module.

FI BAD blinking.

Incompatible firmware loaded.
manager.

Call the system/network

Do not load the AP3 module with a previous version of firmware
less than Version 1.3. Call Digital Services to upgrade the
incompatible module.
QM Module LEDs
QM BAD remains on.

Self-test failed. Retry bridge self-test. Call Digital Services to
replace the module.

QM BAD blinking.

Incompatible firmware loaded.
manager.

Call the system/network

Do not load the AP3 module with a previous version of firmware
less than Version 1.3. Call Digital Services to upgrade the
incompatible module.

Solving Problems

5–7

5.1.2 Port Loopback Testing

If diagnostic results indicate a port interface problem, perform a loopback test on that
interface to determine if the fault is in the bridge, in the interface cable, or in the device connected to the bridge.
When the Manufacturing Mode switch (configuration switch 1) and the Enable External Loopback switch (configuration switch 7) are both ON , the self-test diagnostics test both the FI module (SAS and DAS versions) and NI or NI(3) module ports
(providing the loopback connectors are installed). The diagnostics test the optical
bypass relay driver but not the bypass switch.
WARNING !
To prevent personal injury or equipment damage, do
not insert telecommunications cables into the optical
bypass relay connector.

If the FI module port fails self-test, the FI_BAD indicator turns on. If the NI or NI(3)
module ports fail self-test, the NI_BAD indicator turns on.
5.1.2.1

Installing the Loopback Connectors

When performing port loopback testing, always place loopback connectors on both
the FI module (Port 1) and NI module (Port 2) ports.
Perform loopback testing of the FI module port (SAS and DAS, multimode and single-mode) by using a simple fiber loop housed in an FDDI connector for multimode
connectors or using a single-mode attenuated loopback for a single-mode connector.
These loopback connectors route the output of the fiber optic transmitter in that port
back into the fiber optic receiver.
External loopback testing of the NI port for DECbridge 500 Series units checks both
the AUI and ThinWire interfaces but reports only the results of interface selected by
the AUI/ThinWire switch (configuration switch 8). A detected failure in the selected
interface lights the NI_BAD indicator. External loopback testing of the NI(3) ports
for DECbridge 600 Series units checks the AUI interfaces. There is no ThinWire
port and switch 8 has no effect on the results reported.

5–8

DECbridge 500/600 Series Installation and Upgrade

To install the loopback connectors on NI and FI ports and prepare the unit for loopback testing, perform the following four steps:
1. Remove power to the bridge by disconnecting the power cord from the ac
outlet.
2. Ensure the Manufacturing Mode switch (configuration switch 1) is OFF (up)
and the Enable External Loopback switch (switch 7) to the ON (down) position.
3. Remove the FDDI port cable(s) from the FI module and install the following
loopback connector(s), as shown in Figure 5–1:
–

For FDDI multimode connector(s), install the multimode loopback connector (P/N 12–32005–01).

–

For FDDI single-mode connector(s), install the single-mode attenuated
loopback connector(s) (P/N 12–34830–01).
NOTE
If a loopback connector is not installed or there is no
802.3/Ethernet network connection and the Enable External Loopback switch is ON, self-test fails.

4. Remove the AUI or ThinWire interface cable(s) from the NI or NI(3) module
and install the following loopback connector(s), as shown in Figure 5–2:
–

For NI ThinWire connectors, install the T-connector (PN12-25869-01)
and two terminators (P/N 12-26318-01) on the ThinWire port.

–

For NI or NI(3) AUI connector(s), install the AUI loopback connector(s)
(P/N 12–22196–01).
NOTE
For DECbridge 500 Series models, make sure the AUI/
ThinWire switch (configuration switch 8) is in the correct position: ON (down) for testing the AUI interface
and OFF (up) for testing the ThinWire interface.

Solving Problems

5–9

Figure 5–1:

Installing the FDDI Loopback Connectors

Single-mode
attenuated
loopback
connector

Multimode
loopback
connector

LKG-4867-93I

5–10

DECbridge 500/600 Series Installation and Upgrade

Figure 5–2:

Installing the NI Loopback Connectors

Push slide latch
firmly in place to
lock connector
in place.

Tabs
Slots

LKG-4868-91I

Solving Problems

5–11

5.1.2.2

Running the Loopback Test and Observing the Results

To run the loopback test and observe results, perform the following three steps:
1. Reconnect the power cord to the ac outlet.
2. Observe the LED indicators on the FI module after the self-test diagnostic is
complete (about 30 seconds) and loopback testing starts.
–

If the FDDI port fault does not light, the problem is probably external to
the bridge. Check the interface cable and the device connected to the other end of the cable.

–

If the FDDI port fault indication (FI_BAD) still exists (SOLID RED) and
the AP_BAD LED is flashing, the problem is in the bridge. It may indicate the FI module is bad. Verify that the FI module is properly installed.
If the module is installed properly, refer to the DECbridge 500/600 Series
Problem Solving manual for more information on troubleshooting.

3. Observe the NI_BAD indicator on the NI or NI(3) module.

5.1.2.3

–

If the NI_BAD indicator turns off, the problem is external to the bridge.
Check the interface cable and the device connected to the other end of the
cable.

–

If the NI_BAD indicator lights (the NI_BAD LED on the NI module
flashes; the NI_BAD LED on the NI(3) module is SOLID RED) and the
AP_BAD LED is flashing, the problem is in the bridge. It may indicate
the NI module is bad. Verify that the NI or NI(3) module is properly installed before consulting the DECbridge 500/600 Series Problem Solving
manual for more information on troubleshooting.

Returning to Normal Operation

When you have completed loopback testing of the ports, perform the following five
steps to return the bridge to normal operation:
1. Disconnect the power cord from the ac outlet.
2. Set the Enable External Loopback switch (switch 7) to the OFF (up) position.

5–12

DECbridge 500/600 Series Installation and Upgrade

3. Remove the NI loopback connector(s) and reconnect the NI interface
cable(s). Refer to Chapter 3 if necessary.
4. Remove the FDDI loopback connector(s) and reconnect the FDDI interface
cable(s). Refer to Chapter 3 if necessary.
5. Reconnect the power cord to the ac outlet to resume normal operation.

Solving Problems

5–13

A
DECbridge 500/600 Series Models

The models for the DECbridge 500/600 Series of bridges are listed in Table A–1.
The table includes a description of the modules and interface for each model. Note
that the U.S./Canada versions (for example, DEFEB-AC) are the only versions that
ship with a power cord included. The versions for other countries (for example, DEFEB-AD) require a separate power cord kit designed for specific country installations. These power cord kits are ordered separately. Table A–2 lists the power cord
kits.

A–1

Table A–1:

DECbridge 500/600 Series Models

Model Number

Part Number* Description and Modules

DECbridge 500

DEFEB-AA/AB

Single Attachment Station unit with AP module,
NI1 module, FI module with multimode optics,
and QM module

DECbridge 500 Series

A–2

DECbridge 510

DEFEB-AC/AD

Single Attachment Station unit with AP3 module,
NI1 module, FI module with multimode optics,
and QM module

DECbridge 518

DEFEB-AS/AT

Single Attachment Station unit with AP3 module,
NI1 module, FI module with single-mode
optics, and QM module

DECbridge 520

DEFEB-DA/DB

Dual Attachment Station unit with AP3 module,
NI1 module, FI module with multimode optics
and control for optical bypass relay, and
QM module

DECbridge 524

DEFEB-DM/DN

Dual Attachment Station unit with AP3 module,
NI1 module, FI module with single-mode
(Port 1 A)/ multimode optics (Port 1 B), and
QM module

DECbridge 526

DEFEB-DP/DQ

Dual Attachment Station unit with AP3 module,
NI1 module, FI module with multimode
(Port 1 A)/single-mode optics (Port 1 B), and
QM module

DECbridge 528

DEFEB-DS/DT

Dual Attachment Station unit with AP3 module,
NI1 module, FI module with single-mode
optics, and QM module

DECbridge 500/600 Series Installation and Upgrade

Table A–1 (Cont): DECbridge 500/600 Series Models
Model Number

Part Number* Description and Modules

DECbridge 600 Series
DECbridge 600

DEFEB-UA/UB

Multiport Ethernet bridge with AP3 module,
NI(3) module, Null FI module (no FI port),
and QM module

DECbridge 610

DEFEB-TA/TB

Single Attachment Station unit with AP3 module,
NI(3) module, FI module with multimode
optics, and QM module

DECbridge 618

DEFEB-TS/TT

Single Attachment Station unit with AP3 module,
NI(3) module, FI module with single-mode
optics, and QM module

DECbridge 620

DEFEB-LA/LB

Dual Attachment Station unit with AP3 module,
NI(3) module, FI module with multimode
optics and control for optical bypass relay, and
QM module

DECbridge 624

DEFEB-LM/LN

Dual Attachment Station unit with AP3 module,
NI(3) module, FI module with single-mode
(Port 1 A)/multimode optics (Port B), and
QM module

DECbridge 626

DEFEB-LP/LQ

Dual Attachment Station unit with AP3 module,
NI(3) module, FI module with multimode
(Port 1 A)/single-mode optics (Port 1 B), and
QM module

DECbridge 628

DEFEB-LS/LT

Dual Attachment Station unit with AP3 module,
NI(3) module, FI module with single-mode
optics, and QM module

*Part numbers indicate U.S./Canada model designations followed by the designations for
other countries (for example, DEFEB-AC is designated for U.S./Canada and DEFEB-AD is
designated for all other countries).

DECbridge 500/600 Series Models

A–3

A.1 DECbridge Modules
The DECbridge units contain four modules that control the functions of the bridge:
the AP module, NI module, FI module, and QM module.
The AP module (versions AP, AP2, and AP3) controls the transmission and reception
of the IEEE 802.3/Ethernet packet flow, and coordinates various bridge-management tasks such as the spanning tree process.
The NI module provides the interface to the IEEE 802.3/Ethernet network. An NI
module in the DECbridge 500/600 Series can have one or three AUI connectors, depending on the model. With three AUI connectors, there is no ThinWire connector.
The FI module provides a SAS or DAS connection to the FDDI network. The DAS
connection is multimode, single-mode, or both. The DAS multimode version of the
FI module also provides control for an optical bypass relay. The optical bypass relay
helps maintain FDDI ring integrity if a bridge within the FDDI ring breaks down or is
powered down. The bypass, if used, is automatically activated on a broken bridge
within an FDDI ring, continuing communication.
The QM module services packets received from and transmitted to an FDDI network.
The four module locations on the bridge are shown in Figure A–1. The module slots
are labeled to help identify modules.
NOTE
The DECbridge 500 uses an AP module; all other
models in the DECbridge 500/600 Series use an AP2 or
AP3 module.
NOTE
You need bridge firmware version 1.3 or higher when
using an AP3 module.

A–4

DECbridge 500/600 Series Installation and Upgrade

Figure A–1: DECbridge 500/600 Series Modules
NI module
NI

500 Series

NI(3)

600 Series

AP
NI
FI
QM

FI module

Model

Null

600

SAS multimode

500,510
610

SAS, single-mode

518, 618

DAS multimode

520, 620

DAS single-mode (A),
multimode (B)

524, 624

DAS multimode (A),
single-mode (B)

526, 626

DAS single-mode

528, 628
LKG-4855-93I

DECbridge 500/600 Series Models

A–5

Table A–2:

Power Cord Kits

Order Code

Country

BN20A-2E*

United States, Canada

BN20B-2E

Japan

BN20C-2E

Australia, New Zealand

BN20D-2E

Belgium, Finland, France, Germany, Holland,
Norway, Spain, Sweden

BN20E-2E

United Kingdom, Ireland

BN20F-2E

Switzerland

BN20H-2E

Denmark

BN20J-2E

Italy

BN20K-2E

India, South Africa

BN20L-2E

Israel

*This kit ships with U.S./Canada models only. Power cord kits for units shipped to other
countries are required for installation and must be ordered separately.

A–6

DECbridge 500/600 Series Installation and Upgrade

B
Switches and Indicators

The switches and indicators for the DECbridge 500/600 Series of bridges are located
on the I/O panel of the bridge. Figure B–1 shows the switches and indicator LEDs
on a bridge. Section B.1 and Section B.2 describe the switches and indicators and
their functions.

B.1 Configuration Switches
The eight configuration DIP switches on the DECbridge 500/600 Series unit are located on the AP3 module (see Figure B–1). Switch 1 is the leftmost switch (as you
face the I/O panel). These switches are set during installation of the bridge and control several settable functions of the bridge.

B–1

Figure B–1: Configuration Switches and LED Indicators

Off Configuration switches

1 2 3 4 5 6 7 8

AP
NI
FI
QM

LED Indicators
AP3
NI

AUI
G

NI(3)

Null
FI

SAS
DAS

3
G

4
G

1
Y

PHY 1
G

PHY 1
A
G

PHY 2
B
G

LKG-7324-92I

B–2

DECbridge 500/600 Series Installation and Upgrade

The configuration switches for the bridge (listed in Table B–1) have the following
functions:

•

Manufacturing mode switch (Switch 1) — This switch should always be in
the OFF (up) position for normal operating mode. Manufacturing mode is
only for use in a manufacturing environment or repair station. The firmware
reads this switch only during initialization.

•

Restore default parameters switch (Switch 2) — This switch is normally in
the OFF (up) position. Turning it ON resets all parameters defined by bridge
management and replaces them with the default factory settings. The firmware reads this switch only during initialization; therefore, you must recycle
power to the bridge whenever you change the switch setting or wish to load
default settings.

•

Write access switch - Port 1 (Switch 3) — When this switch is ON, network
stations connected to Port 1 (the IEEE 802.3/Ethernet port) that have bridge
management capabilities are allowed to read and write (modify) bridge-management parameters. When this switch is OFF, those stations are allowed to
read but cannot write bridge management parameters. The firmware checks
the state of this switch whenever a write access to the bridge is attempted
through Port 1. On the DECbridge 500 unit, this switch controls access to
Port 2.

•

Write access switch - Port 2 (Switch 4) — Performs the same function as
described for switch 3, but for Port 2 (FDDI port connectors A and B). On
the DECbridge 500 unit, this switch controls access to Port 1.

•

Write access switch - Port 3 (Switch 5) — The setting for this switch applies only when a three-port NI(3) module is installed. It performs the same
function as described for switch 3 (Port 1), but for Port 3.

•

Write access switch - Port 4 (Switch 6) — The setting for this switch applies only when a three-port NI(3) module is installed. It performs the same
function as described for switch 3 (Port 1), but for Port 4.

Switches and Indicators

B–3

•

External loopback enable switch (Switch 7) — This switch should be OFF
during normal bridge operation. Turning it ON allows the self-test diagnostics to perform external loopback tests on both Ports 1 and 2 (providing the
external loopback connectors are in place). It also applies to Ports 3 and 4
when a three-port NI(3) module is installed. Since the firmware reads this
switch only during initialization, you must recycle power to the bridge whenever you change the switch setting.
AUI/ThinWire switch (Switch 8) — The settings for this switch apply when
a one-port NI module is installed. They do not apply when a three-port NI(3)
module is installed. When a one-port NI module is installed, this switch must
be in the ON (down) position if Port 2 is connected to an AUI interface, or in
the OFF (up) position if Port 2 is connected to a ThinWire interface. The
firmware checks the state of this switch on a regular basis; therefore, changing this switch setting does not require recycling power to the bridge.

Table B–1: Configuration Switches
Factory
Setting

Switch

Name

Manufacturing OFF
mode
Restore default OFF
parameters
Write access
OFF
(Port 1)1
Write access
OFF
(Port 2)1
Write access
OFF
(Port 3)2
Write access
OFF
(Port 4)2
External
OFF
loopback
enable
AUI/ThinWire 3 OFF

2
3
4
5
6
7

ON (Down)

OFF (Up)

Select manufacturing
Select normal
mode
operating mode
Restore default
Use current
parameters on power up parameters
Allow management write No management write
access on Port 1
access on Port 1
Allow management write No management write
access on Port 2
access on Port 2
Allow management write No management write
access on Port 3
access on Port 3
Allow management write No management write
access on Port 4
access on Port 4
Enable External Loopback Normal operation
Test
Select AUI connection
for Port 2

Select ThinWire
connection for Port 2

1 These switches are reversed on the DECbridge 500 unit. Switch 3 is for Port 2;

Switch 4 is for Port 1. Also, Switches 5 and 6 are not used on the DECbridge 500 unit.
2 Not applicable when one-port NI module installed.
3 Not applicable when three-port NI(3) module installed.

B–4

DECbridge 500/600 Series Installation and Upgrade

B.2 Bridge LED Indicators
The DECbridge 500/600 Series LED indicators are visible from the outside of the
unit. Table B–2 describes the LEDs for all DECbridge 500/600 Series modules.
The LEDS are located on each module to indicate functions associated with each
module. The LEDs have the following meanings:

•

A Green LED indicates the presence of power and also shows port state.

•

A Red LED indicates a fault.

•

A Yellow LED indicates the presence of activity on the communication link.

When the DECbridge 500/600 Series is first powered on (ac power cord plugged in),
all LEDs light momentarily for a lamp check. The bridge then performs testing and
the LEDs are turned off and on according to the testing sequence.
Table B–2: LED Indicators
LED

Symbol

Color

Normal

Description

AP BAD

Red

Off

On
Off
Blink

-- Self-test failed
-- Self-test passed
-- Incompatible
firmware loaded

FAN BAD

Red

Off

On
Off

-- Fan failure
-- Fan OK

MODE

Green

On
Off
Blink

-- Bridge operational
-- Self-test in progress
-- Downline load
in progress

DC OK

Green

On
Off

-- DC power OK
-- DC power failure

Red

Off

On
Off
Blink

-- Self-test failed
-- Self-test passed
-- Incompatible firmware loaded

AP3 or AP Module:

QM Module:
QM BAD

Switches and Indicators

B–5

Table B–2 (Cont): LED Indicators
LED

Symbol Color

Normal

Description

Red

Off

On
Off
Blink

-- Self-test failed
-- Self-test passed
-- Incompatible firmware
loaded

Yellow

On/Off

On
Off

-- NI port(n) carrier present
-- NI port(n) carrier not present

Green

On
Blink
Off

-- NI port(n) in forwarding state
-- NI port(n) in broken state
-- NI port(n) not forwarding, not
broken (in preforwarding or
backup state)

AUI SELECT AUI
Green
(DECbridge 500 Series only)

On/Off

On
Off

-- NI port AUI interface selected
-- NI port ThinWire interface
selected

EXT PWR OK

-- AUI transceiver power OK
(In DECbridge 500 Series,
not affected by AUI/ThinWire
switch)
-- AUI transceiver power failure

NI or NI(3) Module:
NI BAD

ACTn
(n= 2, 3, or 4)

FWDn

Green

Off

FI Module: (Note: FI Null Module has only the FI BAD indicator)
FI BAD

ACT1

FWD1

B–6

Red

Off

On
Off
Blink

-- Self-test failed
-- Self-test passed
-- Incompatible firmware loaded

Yellow

On/Off

On
Off

-- Valid traffic present
-- Not transmitting/receiving
valid packets

Green

On
Blink
Off

-- FDDI port in forwarding state
-- FDDI port in broken state
-- FDDI port not forwarding, not
broken (in preforwarding or
backup state)

DECbridge 500/600 Series Installation and Upgrade

Table B–2 (Cont): LED Indicators
LED

Symbol Color

Normal

Description

PHY 1 (A)

PHY 1

On
Blink
On

Green
Green
Red
Red

Blink
Off
Blink

Red/green

PHY 2 (B)
PHY 2
(Only on
DAS models)

Green
Green
Red
Red

On
Blink
On
Blink
Off

-- PHY connection complete
-- PHY connection in progress
-- Broken port or Link Confidence
Test (LCT) failure retry loop
-- Illegal topology
-- Port disabled via management
-- Standby mode for this port
when in a dual-homing
connection to a concentrator
-- PHY connection complete
-- PHY connection in progress
-- Broken port or Link Confidence
Test (LCT) failure retry loop
-- Illegal topology
-- Port disabled via management

B.3 Circuit Breaker
The circuit breaker provides overcurrent protection for the bridge. If an overcurrent
condition causes the circuit breaker to trip, the white center portion of the breaker
pops out as a visual indication of the overcurrent condition. When this occurs, ac
power is cut off from the bridge. Reset the circuit breaker by pushing in the white
center portion of the breaker.

B.4 Port Addressing
The DECbridge 500/600 Series port addresses are listed on the AP3 module and are
assigned as follows:

•

Address 1 — FDDI (Port 1)

•

Address 2 — Ethernet (Port 2, either connector on the NI module;
left connector on the NI(3) module)

•

Address 3 — Ethernet (Port 3, middle connector on the NI(3) module)

•

Address 4 — Ethernet (Port 4, right connector on the NI(3) module)

Switches and Indicators

B–7

B.5 Optical Bypass Connector
The optical bypass relay feature on the bridge maintains FDDI dual ring integrity if
the bridge breaks or is powered down. The optical bypass connector is available only
on the DAS multimode version of the FI module. Figure B–2 shows the bypass connector and provides a description of the connector pins. Refer to this information
when selecting optical bypass devices.
WARNING !
To prevent personal injury or equipment damage, do
not insert telecommunications cables into the optical
bypass relay connector.
Figure B–2: Optical Bypass Control Signals
FI DAS module
R

1
Y

A PHY 1
G

B PHY 2
G

Pins
654 321
Modular jack
(Shielded
RJ12)

Description

1,2
3,4,6
5

Relay drive; +5V @ 200 mA (max.)
Return; grounded internally
Bypass present; must be externally
grounded to pin 3,4, or 6
LKG-5186-93I

B–8

DECbridge 500/600 Series Installation and Upgrade

B.6 FDDI Connector Keying
The connectors used on DECbridge 500/600 Series bridges for FDDI network connection are:

•

Media Interface Connectors (MIC) for multimode connections

•

FC/PC for single-mode connections

The MIC connectors are designed to align the fiber cable properly with the transmit
and receive optics — that is, they are keyed and must be aligned properly. The three
types of connectors used on the bridge are MIC A and MIC B for DAS versions of the
bridge and MIC S for SAS versions of the bridge (see Figure B–3). Note that the
DECbridge units connect to a MIC M type connector on the DECconcentrator 500.
Figure B–3: DECbridge 500/600 Series MIC Receptacle Keying

Plugs
A

Receptacles
A

Connector keying:
MIC A Primary in/secondary out–DAS A port
MIC B Primary out/secondary in–DAS B port
MIC M Concentrator M port
MIC S SAS S port
LKG-6859-92I

The position of the keyway on the MIC plug determines the type of receptacle to
which it connects. A MIC S plug fits all receptacles. The other MIC plugs and receptacles (type A and B) must match for proper installation.
The FC/PC single-mode connectors are not keyed but are identified by transmit
( ) and receive (
) icons.

Switches and Indicators

B–9

B.7 FDDI Connection Rules
The FDDI connection rules are defined in Figure B–4. The table defines which port
types (A, B, M, S) may be interconnected into legal topologies. In the figure, This
Node is the reference point for all connection decisions.
Figure B–4: FDDI Connection Rules Matrix
This Node
PHY port

A
Other
Node

Rule 1

Yes

Rule 2

Yes

Rule 3

Yes
Note 1

Yes

Yes = Accepts this connection
No = Does not accept this connection
LKG-4810-91I

Rule 1:

PHY B of This Node accepts connection to PHY A of Other Node if:
• PHY A of This Node is not connected, or

• PHY A of This Node is connected to PHY B or PHY S of another
node.

Rule 2:

PHY A of This Node accepts connection to PHY B of Other Node if:

• PHY B of This Node is not connected, or
• PHY B of This Node is connected to PHY A or PHY S of another
node.

• See Note 2.

B–10

DECbridge 500/600 Series Installation and Upgrade

Rule 3:

PHY A of This Node accepts the connection to PHY M of Other Node
if:

• PHY B of This Node is not connected, or
• PHY B of This Node is connected to PHY A or PHY S of another
node.

• See Note 2.
Note 1:

Backup tree connection (dual homing)
The connection of PHY B of This Node to PHY M of Other Node always takes
precedence over the connection of PHY A of This Node to PHY M of another
node.
A connection between PHY A of This Node and a PHY M or PHY B of another
node is disabled when PHY B of This Node connects to PHY M of Other Node.
If the connection breaks between PHY B of This Node and PHY M of Other
Node, the connection is reestablished between PHY A of This Node and PHY
M of another node.

Note 2:

Tree connections are preferred over dual ring connections
Tree connections are preferred over dual ring connections when only one of
two connections can be accepted.
The connection of PHY A or B of This Node to PHY M of Other Node always
takes precedence over the connection of the remaining PHY (A or B) of This
Node to PHY A or PHY B of another node.
The connection is disabled between the remaining PHY (A or B) of This Node
and PHY A or PHY B of another node when PHY A or PHY B of This Node
connects to PHY M of Other Node.

Switches and Indicators

B–11

C
Specifications

C.1 Specifications
Specifications for the DECbridge 500/600 Series of bridges are divided into the following categories and described in Table C-1 through Table C-5: physical, electrical,
environmental, acoustic, and cable.
The DECbridge 500/600 Series is designed to operate in a satellite equipment room
(SER), mounted on a table or desktop, or in a standard 48-centimeter (19-inch) rack.
CAUTION !
The air inside a rack can be hotter than the ambient room
temperature. Make sure the air entering the bridge does
not exceed the maximum inlet temperature of 50° C
(122° F).

C–1

Table C–1: Physical Specifications
Dimension

Value

Height

17.68 cm (6.96 in)

Width

44.20 cm (17.40 in)

Depth

36.53 cm (14.38 in)

Weight

14.51 kg (32 lbs)

Table C–2: Electrical Specifications
Parameter

Value

Voltage

88 to 264 Vac, single-phase, 3-wire

Frequency

47 Hz to 63 Hz

Input power

390 W (maximum)

Heat dissipation

1330 BTU/hr (maximum)

Amperage

3.9 at 100 V
1.7 at 240 V

Table C–3: Environmental Specifications
Parameter

Value

Operating Environment
Temperature (at sea level)*

5° C to 50° C (41° F to 122° F)

Relative humidity

10% to 95% (non-condensing)

Wet-bulb temperature

32° C (90° F) maximum

Altitude

Sea level to 2.4 km (8000 ft)

Inlet air temperature

50° C (122° F) maximum

Nonoperating Environment
Temperature

-40° C (-40° F) to 66° C (151° F)

Relative humidity

10% to 95% (noncondensing)

Altitude

Sea level to 9.1 km (30,000 ft)

*Reduce the maximum operating ambient temperature by 1.8° C per 1000 meters
(1.0° F per 1000 ft) for operation at high-altitude sites.

C–2

DECbridge 500/600 Series Installation and Upgrade

Table C–4: Acoustic Values*

Product

Sound Power Level
LWAd, B

Sound Pressure Level
LpAm, dBA
(bystander positions)

DECbridge 500/600
Series

Idle/Operate
6.6

Idle/Operate
52

* Declared values per ISO 9296 and ISO 7779. Current values for specific configurations
are available from your Digital Services representative. (1 B = 10 dBA)

C.1.1 Cable Specifications

Table C–5 lists some of the specifications for the power cable, IEEE 802.3/Ethernet
cable, and FDDI cable. For more information on cables, refer to the Networks
Buyer’s Guide.
Table C–5: Cable Specifications
Item
Power
AC power cord length

Value

U.S. -- 1.83 m (6 ft)
Others -- 2.5 m (8.2 ft)

IEEE 802.3/Ethernet AUI Interface
Transceiver cable length

50 m (164 ft) maximum

IEEE 802.3/Ethernet ThinWire Interface
ThinWire cable length

Specifications

185 m (606 ft) maximum

C–3

Table C–5 (Cont): Cable Specifications
Item

Value

Recommended Multimode Fiber Interface Cable
Cable length

2 km (6561 ft) maximum

Nominal core diameter

62.5 ± 3.0 µm

Cladding diameter

125.0 ± 2.0 µm

Numerical aperture

0.275 ± 0.015

Modal bandwidth minimum

500 MHz• km at 1300 nm, 160 MHz• km at 850 nm

Maximum attenuation rate

1.5 dB/km at 1300 nm, 3.5 dB/km at 850 nm

Power budget

11.0 dB at 1300 nm (for FDDI), varies by product
at 850 nm

Fiber optic connector types

Approved MIC plug types A, B, and S; maximum
attenuation is 1.0 dB.

Alternate Multimode Fiber Interface Cable

100/140

50/125

Cable length

2 km (6561 ft) maximum

Nominal core diameter

100 µm* ± 4.0 µm

50 µm* ± 3.0 µm

Cladding diameter

140 µm* ± 6.0 µm

125 µm* ± 2.0 µm

Optical wavelength

1300 nm

Numerical aperture

0.290 ± 0.015

0.200 ± 0.015

Modal bandwidth minimum

500 MHz• km @ 1300 nm

Power budget for FDDI

9.0 to 13.0 dB

6.0 to 7.0 dB

Maximum distance

1.6 km (.96 mi)

2 km (1.2 mi)

(*Power budget contingent on core and cladding tolerances)

C–4

DECbridge 500/600 Series Installation and Upgrade

Table C–5 (Cont): Cable Specifications
Item

Value

Recommended Single-mode Fiber Interface Cable
Cable length

40 km (24.8 miles) maximum

Mode field diameter

8.2 µm to 10.5 µm

Cladding diameter

125 µm (+ 2.0 µm)

Fiber cladding noncircularity

2% maximum

Core to cladding concentricity error

1 µm maximum

Nominal operating wavelength

1300 nm

Fiber cutoff wavelength

1270 nm maximum

Zero dispersion wavelength

1300 to 1322 nm

Zero dispersion slope

0.095 ps/(nm2km) maximum

Optical power attenuation

≤0.40 dB per km at 1310 nm

Minimum power budget

22 dB at 1300 nm

Minimum required loss

12 dB at 1300 nm

Fiber optic connector types

Approved FC/PC plug types

Recommended Out-of-Band Management Cable
For VT100 or VT200 Series Terminals

BC22D-xx cables with 25-pin connectors
at each end. If you use P/N BC16E-xx
cables, use a passive adapter (P/N H8575A)
at each end of the cable.

For VT300 or VT400 Series Terminals

Use the standard six-pin modular jack (MJ6)
connector cable P/N BC16E-xx. Use the passive
adapter H8575A on the bridge end of the cable.

Specifications

C–5

D
Hardware Upgrade Options

You can upgrade the DECbridge 500 unit (as well as other models in the DECbridge
500/600 Series) to another model in the DECbridge 500/600 Series. To upgrade, you
add new modules to your existing unit.
The three upgrade kits available from Digital provide modules that allow you to upgrade your DECbridge unit in one of the following ways:

•

Upgrade from a DECbridge 500 (one FDDI connection and one AUI or ThinWire connection) to a DECbridge 610 (one FDDI connection and three AUI
connections, no ThinWire connection). The kit used to perform this upgrade
(P/N DEFEB-UG) contains:
–

AP3 module

–

NI(3) module

–

AUI testing loopbacks (2)

–

QC kit including release notes, license, software product description, and
Configuring the SNMP Agent manual

–

Documentation kit (P/N DEFEB-DK) that includes:
•

Label sheet with new model numbers

•

Upgrade procedures (includes FDDI registration card)

D–1

•

Upgrade from a DECbridge 510 (one FDDI connection and one AUI or
ThinWire connection) to a DECbridge 520 (two FDDI connections and one
AUI or ThinWire connection), upgrade from a DECbridge 600 to a DECbridge 620, and upgrade from a DECbridge 610 to a DECbridge 620. The
kit used to perform these upgrades (P/N DEFEB-UP) contains:
–

FI DAS module (two FDDI connectors)

–

One multimode testing loopback (two loopbacks required when upgrading from a DECbridge 600 to DECbridge 620)

–

Documentation kit (P/N DEFEB-DK) that includes:
•

Label sheet with new model numbers

•

Upgrade procedures (includes FDDI registration card)

•

Combine the two upgrade kits (DEFEB-UG and DEFEB-UP) and upgrade
from a DECbridge 500 (one FDDI connection and one AUI or ThinWire connection) to a DECbridge 620 (two FDDI connections and three AUI connections, no ThinWire connection).

•

Upgrade for a DECbridge 500/600 Series unit to a DECbridge 500/600 Series
unit with out-of-band management. The kit used to perform this upgrade
(P/N DEFEB-UR) contains:
–

AP3 module with OBM

–

QC kit including release notes, license, software product description, and
Configuring the SNMP Agent manual

–

Documentation kit (P/N DEFEB-DK) that includes:
•

Label sheet with new model numbers

•

Upgrade procedures (includes FDDI registration card)
NOTE
The AP3 module ships with DECbridge version 1.3
firmware. Ensure that if you reload the AP3 module
with firmware at a future date that the version is version
1.3 or higher.

D–2

DECbridge 500/600 Series Installation and Upgrade

E
Related Documents

Additional information on the DECbridge and FDDI can be found in the following
documents:

•

Bridge and Extended LAN Reference (Order No. EK-DEBAM-HR)
Describes how bridges are used to create extended local area networks
(LANs). Includes information on LAN interconnections, overall bridge operation, spanning tree, bridge management, and possible solutions to bridgerelated problems in a network.

•

Configuring the SNMP Agent for DECconcentrator 500, DECbridge 500/600
Series, and LAN Bridge 200 Products (Order No. AA-PR84A-TE)
Describes how to configure the DECconcentrator 500, DECbridge 500/600
Series, and LAN Bridge 200 products as SNMP agents. It also includes troubleshooting information and tests to verify the configuration.

•

DECbridge 500/600 Series Problem Solving (Order No. EK-DEFEB-PS)
Explains how to troubleshoot and service the DECbridge 500/600 Series
units. Information includes a product overview, problem-solving methods,
removal and replacement procedures for field-replaceable units (FRUs), and
configuration guidelines.

E–1

•

DECconcentrator 500 Installation (Order No. EK-DEFCN-IN)
Explains how to install a DECconcentrator 500 wiring concentrator and how
to check its installation and operational status.

•

DECconcentrator 500 Problem Solving (Order No. EK-DEFCN-PS)
Explains how to troubleshoot and service the DECconcentrator 500 unit. Information includes a product overview, problem-solving methods, and removal and replacement procedures for field-replaceable units (FRUs).

•

DECconnect System Satellite Equipment Room Installation Guide
(Order No. EK-DECSY-SR)
Provides all the steps and procedures for installing the satellite equipment
room.

•

DECconnect System Fiber Optic Planning and Configuration
(Order No. EK-DECSY-FP)
Provides an overview of Digital’s structured wiring network along with
guidelines for planning, configuring, and designing fiber optic subsystems
within the network.

•

DECconnect System Fiber Optic Installation (Order No. EK-DECSY-FI)
Contains guidelines for installing fiber optic cables and passive equipment in
a DECconnect System fiber optic structured wiring network, along with test
procedures for certifying the installation.

•

DECconnect System Planning and Configuration Guide
(Order No. EK-DECSY-CG)
Contains planning requirements and guidelines for configuring DECconnect
System networks and other networks that use DECconnect System products.

E–2

DECbridge 500/600 Series Installation and Upgrade

•

DECconnect System Facilities Cabling Installation Guide
(Order No. EK-DECSY-FC)
Provides procedures for properly installing Ethernet coaxial cables,
twisted-pair cables, and ThinWire cables within a DECconnect System site.

•

DECmcc Bridge Access Module Use (Order No. AA-PD1BC-TE)
Describes how to use the DECmcc (Digital Management Control Center)
Bridge Access Module to manage bridges.

•

DEFEB DECbridge 500/600 Series (Order No. EK-DEFEB-IP)
Contains the illustrated parts breakdown for the DECbridge 500/600 Series
units.

•

FDDI System Level Description (Order No. EK-DFSLD-SD)
Describes Digital’s Fiber Distributed Data Interface (FDDI) implementation,
how it works, and the role of the individual FDDI components. The manual
also discusses Digital’s approach to network management and the facilities
provided by network management software and ring-wide configuration issues.

•

Fiber Distributed Data Interface Network Configuration Guidelines
(Order No. EK-DFDDI-CG)
Describes the guidelines for connecting devices to an FDDI network. It also
includes network configurations and examples.

•

Networks Buyer’s Guide
Describes Digital’s networking products. Contact your local Digital sales
office to receive a copy.