Digital Equipment DECbridge 500 Series Instruction sheet

Order Number: EK-DEFEB-PS-002
DECbridge500/600 Series
Problem Solving

1
NOTICE – Class A Computing Device:
Thisequipmentgenerates,uses,andmayemitradiofrequencyenergy. Theequipmenthas
been type tested and found to comply with the limits for a Class A computing device
pursuantto 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.Operationofthisequipmentin aresidentialareamay causeinterference; in
which case, measures taken to correct the interference are at the user’s expense.
CAUTION
The people who install the cabling system described in this guide should be familiar with
local building codes, fire codes, and any other applicable codes or regulations. The
manufacturers or their distributors and agents will not be responsible for damage due to
improperly installed cabling, neglect, misuse, or improper connection of devices to the
cabling system.
NOTICE – Class 1 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.

Order Number: EK-DEFEB-PS-002
DECbridge500/600 Series
Problem Solving
July 1991
This manual describes how to troubleshoot and service the
DECbridge 500/600 series. It is intended for qualified service
personnel who will be repairing the bridge to the
field-replaceable unit level.
Supersession/Update Information: This is a revised manual.

This manual was produced by Telecommunications and Networks Publications.
EK–DEFEB-PS-002
JULY 1991
Theinformationinthisdocumentissubjecttochangewithoutnoticeandshouldnotbeconstruedasa
commitmentbyDigitalEquipmentCorporation.DigitalEquipmentCorporation assumesnorespon-
sibility for any errors that may appear in this document.
Copyright 1991 by Digital Equipment Corporation
All Rights Reserved.
Printed in U.S.A.
The following are trademarks of Digital Equipment Corporation:
DEBET DECmcc ThinWire
DEC DECnet TURBOchannel
DEC FDDIcontroller DECstation ULTRIX
DECbridge DECUS UNIBUS
DECconcentrator DECwindows VAX
DECconnect DELNI VAXcluster
DECelms DESTA VAXstation
LAN Traffic Monitor
PDP VMS

iii
Contents
Safety
Preface
1 Introduction
1.1 General Description 1–1. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
2 Problem Solving
2.1 Introduction 2–1. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
2.2 Normal Power Up 2–2. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
2.3 Self-Test Diagnostics (Overview) 2–4. . . . . . . . . . . . . . . . . . . . . . . .
2.4 Recommended Approach to Problem Solving 2–5. . . . . . . . . . . . . .
2.4.1 Problem-Solving Tools and Components 2–6. . . . . . . . . . . . . . . .
2.4.2 Running the Self-Test Diagnostics 2–6. . . . . . . . . . . . . . . . . . . . .
2.4.3 Visually Inspecting the Bridge 2–6. . . . . . . . . . . . . . . . . . . . . . . .
2.4.4 Interpreting the LED Indicators 2–9. . . . . . . . . . . . . . . . . . . . . . .
2.4.5 If the Problem Still Exists 2–13. . . . . . . . . . . . . . . . . . . . . . . . . . . .
2.4.6 Performing Loopback Testing 2–18. . . . . . . . . . . . . . . . . . . . . . . .
2.4.6.1 Preparing the Unit for Loopback Testing 2–18. . . . . . . . . . . . . .
2.4.6.2 Installing the FDDI Loopback Connector(s) 2–19. . . . . . . . . . .
2.4.6.3 Installing the NI Loopback Connector(s) 2–20. . . . . . . . . . . . . .
2.4.6.4 Running the Loopback Test and Observing the Results 2–22. . .
2.4.6.5 Returning to Normal Operation 2–22. . . . . . . . . . . . . . . . . . . . .
2.4.7 Measuring the FI Power 2–23. . . . . . . . . . . . . . . . . . . . . . . . . . . . .

iv
3 Removal and Replacement Procedures
3.1 Introduction 3–1. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
3.2 Preparing the Bridge for Servicing 3–3. . . . . . . . . . . . . . . . . . . . . . .
3.3 Removing and Replacing the FRUs 3–5. . . . . . . . . . . . . . . . . . . . . .
3.3.1 Tools Required 3–5. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
3.3.2 Removing and Replacing Logic Modules 3–5. . . . . . . . . . . . . . .
3.3.2.1 Removing Logic Modules 3–6. . . . . . . . . . . . . . . . . . . . . . . . .
3.3.2.2 Replacing Logic Modules 3–7. . . . . . . . . . . . . . . . . . . . . . . . .
3.3.3 Removing and Replacing the Card Cage 3–9. . . . . . . . . . . . . . . .
3.3.3.1 Removing the Card Cage 3–9. . . . . . . . . . . . . . . . . . . . . . . . . .
3.3.3.2 Replacing the Card Cage 3–10. . . . . . . . . . . . . . . . . . . . . . . . . .
3.3.4 Removing and Replacing the Power Supply 3–11. . . . . . . . . . . . .
3.3.4.1 Removing the Power Supply 3–11. . . . . . . . . . . . . . . . . . . . . . .
3.3.4.2 Replacing the Power Supply 3–12. . . . . . . . . . . . . . . . . . . . . . .
3.3.5 Removing and Replacing the Fan Assembly 3–13. . . . . . . . . . . . .
3.3.5.1 Removing the Fan Assembly 3–14. . . . . . . . . . . . . . . . . . . . . . .
3.3.5.2 Replacing the Fan Assembly 3–15. . . . . . . . . . . . . . . . . . . . . . .
3.3.6 Removing and Replacing the Backplane 3–15. . . . . . . . . . . . . . . .
3.3.6.1 Removing the Backplane 3–16. . . . . . . . . . . . . . . . . . . . . . . . . .
3.3.6.2 Replacing the Backplane 3–16. . . . . . . . . . . . . . . . . . . . . . . . . .
4 Technical Information
4.1 Physical Description 4–1. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
4.2 DECbridge 500/600 Series Switches and Indicators 4–3. . . . . . . . .
4.2.1 Circuit Breaker 4–4. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
4.2.2 Configuration Switches 4–4. . . . . . . . . . . . . . . . . . . . . . . . . . . . .
4.2.3 Indicators 4–6. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
4.3 Block Diagram Description 4–9. . . . . . . . . . . . . . . . . . . . . . . . . . . .
4.3.1 AP2 (or AP) Module Description 4–10. . . . . . . . . . . . . . . . . . . . . .
4.3.2 QM Module Description 4–10. . . . . . . . . . . . . . . . . . . . . . . . . . . . .
4.3.3 FI Module Description 4–10. . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
4.3.4 NI Module Description 4–11. . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
4.3.5 Power Supply 4–11. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

v
4.3.5.1 Power Supply Shutdown 4–12. . . . . . . . . . . . . . . . . . . . . . . . . .
4.3.5.2 Thermal Protection 4–12. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
4.3.5.3 DC OK Output Signal 4–12. . . . . . . . . . . . . . . . . . . . . . . . . . . .
4.3.6 Fan Assembly 4–13. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
4.4 Product Specifications 4–14. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
4.4.1 Physical Specifications 4–14. . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
4.4.2 Electrical Specifications 4–14. . . . . . . . . . . . . . . . . . . . . . . . . . . . .
4.4.3 Environmental Specifications 4–15. . . . . . . . . . . . . . . . . . . . . . . . .
4.4.4 Cabling Specifications 4–16. . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
A Configuration Guidelines
A.1 General Guidelines A–1. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
A.2 Bridge-to-FDDI Guidelines A–1. . . . . . . . . . . . . . . . . . . . . . . . . . . .
A.3 Bridge-to-802.3/Ethernet Guidelines A–2. . . . . . . . . . . . . . . . . . . . .
A.3.1 AUI Interface A–2. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
A.3.2 ThinWire Interface A–4. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
B FDDI Connection Information
B.1 FDDI Connection Rules B–1. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
B.2 FDDI Connector Keying B–3. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
C Related Documents
Index
Figures
1–1 DECbridge 500/600 Series in a Sample Configuration 1–1. . . . . . .
1–2 Typical DECbridge 500/600 Series Unit (I/O Panel) 1–3. . . . . . . . .
2–1 LED Indicators After Power Up 2–3. . . . . . . . . . . . . . . . . . . . . . . . .
2–2 Visually Inspecting the Bridge 2–7. . . . . . . . . . . . . . . . . . . . . . . . . .
2–3 Problem Solving a Power-Off Condition 2–14. . . . . . . . . . . . . . . . . .

vi
2–4 Problem Solving the FDDI Interface 2–15. . . . . . . . . . . . . . . . . . . . .
2–5 Installing the FDDI Loopback Connectors 2–19. . . . . . . . . . . . . . . . .
2–6 Installing the NI Loopback Connectors 2–21. . . . . . . . . . . . . . . . . . .
2–7 Measuring the FI Transmit Power (Multimode) 2–24. . . . . . . . . . . . .
2–8 Measuring the FI Receive Power (Multimode) 2–25. . . . . . . . . . . . .
3–1 DECbridge 500/600 Series Field-Replaceable Units 3–2. . . . . . . . .
3–2 Power Cord and Interface Cable Removal 3–4. . . . . . . . . . . . . . . . .
3–3 Logic Module Removal and Replacement 3–7. . . . . . . . . . . . . . . . .
3–4 Card Cage Removal and Replacement 3–10. . . . . . . . . . . . . . . . . . . .
3–5 Power Supply Removal and Replacement 3–12. . . . . . . . . . . . . . . . .
3–6 Fan Assembly Removal and Replacement 3–14. . . . . . . . . . . . . . . . .
3–7 Backplane Removal and Replacement 3–17. . . . . . . . . . . . . . . . . . . .
4–1 Typical DECbridge 500/600 Series Unit (I/O Panel) 4–1. . . . . . . . .
4–2 Switches and Indicators 4–3. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
4–3 Simplified Block Diagram 4–9. . . . . . . . . . . . . . . . . . . . . . . . . . . . .
B–1 FDDI Connection Rules Matrix B–1. . . . . . . . . . . . . . . . . . . . . . . . .
B–2 FDDI Connector Keying B–3. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Tables
1–1 DECbridge 500/600 Series Units 1–2. . . . . . . . . . . . . . . . . . . . . . . .
1–2 Logic Modules used in the DECbridge 500/600 Series 1–4. . . . . . .
2–1 Problem Solving Via the LEDs 2–9. . . . . . . . . . . . . . . . . . . . . . . . . .
2–2 FDDI Transmit and Receive Power Calculation 2–26. . . . . . . . . . . . .
3–1 Field-Replaceable Units 3–3. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
4–1 Configuration Switches 4–4. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
4–2 LED Indicators 4–6. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
4–3 Physical Specifications 4–14. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
4–4 Electrical Specifications 4–14. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
4–5 Environmental Specifications 4–15. . . . . . . . . . . . . . . . . . . . . . . . . . .
4–6 Cable Specifications 4–16. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

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 Signalelesinformationsdestinéesàprévenirla détérioration
du matériel.
Aviso Contiene información para evitar daños personales.
Precaucion Contiene información para evitar daños al equipo.

viii
Thewarningsandcautionsthatmustbeobservedfor thehardwaredescribedinthismanu-
al are listed below in English, German, French, and Spanish. The pages on which these
safety messages appear are also listed.
WARNING !To remove power from the unit, disconnect the power cord. Do not
applypowertotheunitunlessthecardcageassemblyisfullyinserted
in the bridge enclosure.
VORSICHT Schließen Sie das Gerät nicht an das Stromnetz an, solange das
Kartenmagazin nicht vollständig in das Gehäuse eingeschoben ist.
Ein Netzschalter ist nicht vorhanden! Um die Stromzufuhr zu un-
terbrechen, müssen Sie das Netzkabel aus der Steckdose ziehen.
DANGER Avant de mettre l’appareil sous tension, assurez-vous que le pan-
ier est complètement enfoncé dans le boîtier. Pour mettre l’ap-
pareil hors tension, débranchez le cordon d’alimentation.
AVISO No permita que llegue suministro eléctrico a la unidad, a menos
que el módulo de ensamblamiento de tarjetas esté completa-
mente insertado en la carcasa del puente. Para ello, desconecte el
cablede alimentación.
WARNING !Asafety earth ground wire has been incorporated into this product
through the plug cap of the ac power cord. For continued protection
againsttheriskofelectricalshock,thisproductmustbeconnectedto
athree-wire wall receptacle that has its grounding terminal reliably
connected to the building’s safety earth ground.
VORSICHT Das Stromkabel in diesem Gerät ist mit einem Schutzleiter verse-
hen. Um optimale Sicherheit zu gewährleisten, dürfen Sie es nur an
eineordnungsgemäß geerdete Schuko-Steckdose anschließen.
DANGER Cet équipement est mis à la terre au moyen du fil de terre du cor-
don d’alimentation secteur. Afin d’assurer une protection efficace
contretoutrisqued’électrocution,cetéquipementdoitêtreraccordé
à une prise secteur équipée d’un contact de mise à la terre
effectivement relié à la terre secteur du bâtiment.
AVISO Este producto incorpora un cable de tierra de seguridad mediante
el enchufe trifásico del cable de alimentación. Para evitar el riesgo
de descargas eléctricas, este producto debe estar conectado a un
receptáculotrifásico de pared que tenga su terminal de tierra debi-
damente conectado a la toma de tierra de seguridad del edificio.