Digital Equipment DECbridge 500 Problem Solving Download Page 39

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Problem Solving

2–19

2.4.6.2

Installing the FDDI Loopback Connector(s)

SAS units have one FDDI connector; DAS units have two. Depending on the model,
these connectors may be multimode or single-mode. Be sure to install the proper
loopback connectors for your particular unit, as shown in Figure 2–5.

Figure 2–5:

Installing the FDDI Loopback Connectors

LKG–4867–91I

Single-mode
attenuated
loopback
connector

Multimode
loopback
connector

Summary of Contents for DECbridge 500

Page 1: ...Order Number EK DEFEB PS 002 DECbridge 500 600 Series Problem Solving...

Page 2: ...ase 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 cod...

Page 3: ...g 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...

Page 4: ...poration assumes no respon 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...

Page 5: ...elf 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 Prepar...

Page 6: ...ply 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 Re...

Page 7: ...ines 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 FDD...

Page 8: ...n 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...

Page 9: ...e beachtet werden m ssen um den Benutzer vor Schaden zu bewahren Achtung Enth lt Informationen die beachtet werden m ssen um die Ger te vor Schaden zu bewahren Danger Signale les informations destin e...

Page 10: ...cte el cable de alimentaci n WARNING A safety earth ground wire has been incorporated into this product through the plug cap of the ac power cord For continued protection againstthe risk of electrical...

Page 11: ...Avant de mettre l appareil sous tension assurez vous que le panier est compl tement enfonc dans le bo tier Seuls les tech niciens de maintenance qualifi s sont habilit s effectuer les op rations de d...

Page 12: ...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 pa...

Page 13: ...tout risque de d t rioration veillez respecter l al ignement lors des op rations de d pose et de repose PRECAUCION Estos m dulos l gicos tienen componentes en ambas partes de la placa Si se retira o...

Page 14: ...rnen bedenken Sie da es 11 kg wiegt St tzen Sie es mit einer Hand von unten ab und achten Sie darauf da es nicht auf den Boden f llt ATTENTION Le panier p se environ 11 kg Manipulez le avec pr caution...

Page 15: ...acturing personnel as well as system network managers All procedures that deal with opening the unit for any reason are intended solely for service personnel who have been trained to perform product m...

Page 16: ...a list of major assemblies switches and indicators and a summary of the bridge specifications Appendix A Presents configuration guidelines for connecting the bridge to an FDDI and an IEEE 802 3 Ethern...

Page 17: ...between a 100 Mb s Fiber Distributed Data Interface FDDI network and up to three 10 Mb s IEEE 802 3 Ethernet network segments Figure 1 1 DECbridge 500 600 Series in a Sample Configuration FDDI networ...

Page 18: ...ultimode Port A Port B 524 DEFEB DP DQ 1 DAS Single mode Port A Multimode Port B 526 DEFEB DM DN 1 DAS Multimode Port A Single mode Port B 528 DEFEB DS DT 1 DAS Single mode Port A Port B 600 DEFEB UC...

Page 19: ...ries models have an AUI connector and a ThinWire connector switch selectable for the single IEEE 802 3 Ethernet interface The DECbridge 600 series models all have three AUI connectors NOTE The DECbrid...

Page 20: ...and NI 3 are used only when referring specifically to those two modules Table 1 2 Logic Modules used in the DECbridge 500 600 Series Model AP Module NI Module QM Module FI Module 500 AP NI QM FI SAS M...

Page 21: ...anagement software Local LED indicators that provide information on FRU status LAN activity port states network interface selection AUI or ThinWire IEEE 802 3 Ether net transceiver power and FDDI phys...

Page 22: ...is unable to turn off the LEDs The self test diagnostic takes up to 1 minute to complete during which time the indicators will turn on and off according to the testing sequence If the tests detect a...

Page 23: ...oblem Solving 2 3 Figure 2 1 LED Indicators After Power Up LKG 5057 91I AP NI FI QM 2 2 AUI 2 3 4 1 PHY 1 PHY 1 PHY 2 LED Indicators AP2 NI NI 3 Null SAS DAS QM FI 1 On Off On or Off Flashing Legend A...

Page 24: ...reen if the bridge uses the AUI connection to the network and off if the bridge uses the ThinWire connection Configuration switch 8 in the ON position selects the AUI interface and in the OFF position...

Page 25: ...anufac turing mode These modes are selectable by configuration switch 1 on the I O panel see Chapter 4 Only normal mode should be used in the field Manufacturing mode is designed for use in a manufact...

Page 26: ...self test locally by turning ac power to the bridge off for at least 15 seconds then turning it back on 2 4 3 Visually Inspecting the Bridge Before performing in depth problem solving procedures such...

Page 27: ...Problem Solving 2 7 Figure 2 2 Visually Inspecting the Bridge...

Page 28: ...ble con nector s must be pushed securely into place in the bridge connector s The AUI cable connector locks in place with a slide latch Push the slide latch to the left to make sure it snaps in the lo...

Page 29: ...ny of the FRUs Symptom Probable Cause Corrective Actions General One or more LEDs do not Module s are not Remove and reseat the logic modules light during lamp test properly seated Section 3 3 2 Bad m...

Page 30: ...AP module and retest Defective power If the LEDs still remain off after all previous supply actions have been taken replace the power supply Section 3 3 4 All LEDs remain on Core test failure Replace...

Page 31: ...dule to fail NI_BAD blinking Incompatible Load compatible firmware firmware loaded FWDn blinking Port n in broken Check the external connection to the NI port state Perform external loopback tests Che...

Page 32: ...taining a compatible firmware revision Section 3 3 2 FWD1 blinking green FI port in broken Perform loopback test as described in Section 2 4 6 state FWD1 off FI Port in pre Wait 1 minute and verify th...

Page 33: ...tion 2 4 6 QM Module LEDs QM_BAD remains on QM module failed Replace the QM module Section 3 3 2 and AP_BAD is off self test diagnostic FI module is causing Replace the FI module Section 3 3 2 QM modu...

Page 34: ...ound in log Log indicates fan failure Possible over tem perature in power supply Check for obstructions at in let outlet grills and for hot environ ment Replace fan assembly and retest Solve the probl...

Page 35: ...linking green Loopback Test Yes No No FI_BAD on A B Loopback connector installed Install loopback connector No Yes Yes Wait 1 minute No No No Check connection Yes No No Yes A PHY_n solid green Yes No...

Page 36: ...d retest No No Yes Replace FI module and retest A C Turn power off Install loopback connectors and set loopback switch on Section 2 4 5 Measure Tx power to and from the bridge Section 2 4 7 Record bot...

Page 37: ...d have correctly identified the ring topology Calculate cable loss Section 2 4 7 Yes No Yes No C If you have not already done so replace FI module and retest If failure persists a network topology pro...

Page 38: ...testing if the FI port fails self test the FI_BAD indicator will turn on If any of the NI or NI 3 ports fail self test the NI_BAD indicator will turn on Note that on a DECbridge 500 series unit both t...

Page 39: ...have two Depending on the model these connectors may be multimode or single mode Be sure to install the proper loopback connectors for your particular unit as shown in Figure 2 5 Figure 2 5 Installing...

Page 40: ...ack Connector s DECbridge500seriesunitshaveasingleswitch selectableAUI ThinWireinterface DECbridge 600 series units have three separate AUI interfaces To install the NI loopback connector s 1 Disconne...

Page 41: ...Problem Solving 2 21 Figure 2 6 Installing the NI Loopback Connectors LKG 4868 91I Push slide latch firmly in place to lock connector in place Slots Tabs...

Page 42: ...AD indicator on the NI module 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 The LED on the lo...

Page 43: ...pback switch switch 7 to the OFF up position and removing the loop back connector from the FI port if one is installed 2 Set up the optical power meter as follows a Remove the protective cap from the...

Page 44: ...bridge and from the meter Figure 2 7 Measuring the FI Transmit Power Multimode LKG 5062 90I Tester receive cable Transmit signal from bridge On Off Wavelength select 5 To measure the power of the fib...

Page 45: ...he FI Receive Power Multimode LKG 5063 90I Normal connection FDDI cable to bridge Receive signal to bridge c The power level of the receive signal will be displayed on the meter Record the value in Ta...

Page 46: ...ement falls outside the given range that optical signal is not within specifications Refer to the flow chart in Figure 2 4 for recommended correc tive actions Multimode Power level of the transmit sig...

Page 47: ...fectivecomponentstothefield replaceable unit FRU level Table 3 1 liststheFRUsintheDECbridge500 600seriesandtheir Digital part numbers WARNING Lethal exposed voltages exist in the power supply Therefor...

Page 48: ...ing Figure 3 1 DECbridge 500 600 Series Field Replaceable Units Not a field replaceable unit LKG 5064 90I Bridge enclosure Backplane Power supply module Card cage assembly Fan assembly AP AP2 module N...

Page 49: ...9 DECbridge 600 QM module 54 19371 01 All models Backplane 54 19377 01 All models Power supply 30 32524 01 All models Fan assembly 70 27394 01 All models 3 2 Preparing the Bridge for Servicing Follow...

Page 50: ...ipment can emit laser light that can injure your eyes Never look into an optical fiber con nector or connector port Figure 3 2 Power Cord and Interface Cable Removal Power cord LKG 5120 91A Single mod...

Page 51: ...lly inserted in the bridge enclosure Only qualified service engi neers should perform any FRU removal and replace ment procedures CAUTION Modules in the bridge can be damaged by electrostatic discharg...

Page 52: ...tsonbothsidesofthe module Removing or inserting a module at a slight angle can damage it 1 Remove ac power to the bridge and disconnect all interface cables Section 3 2 2 Attach the ESD ground strap t...

Page 53: ...ule 3 3 2 2 Replacing Logic Modules To make sure you have the correct replacement module check the name of that mod uleontheleftsideofthemodulehandle Therevisionlevelisshownontherightside of the handl...

Page 54: ...Section 3 2 4 Check that the logic 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 sl...

Page 55: ...surface To remove the card cage from the bridge enclosure refer to Figure 3 4 and follow these steps 1 Remove power to the bridge and disconnect the interface cables Section 3 2 2 Attach the ESD groun...

Page 56: ...2 Replacing the Card Cage To replace the card cage assembly in the bridge enclosure refer to Figure 3 4 and follow these steps 1 Make sure that power is removed from the bridge and the interface cabl...

Page 57: ...the ESD ground strap Then remove the card cage from the bridge enclosure Section 3 3 3 1 WARNING Lethal exposed voltages exist in the power supply Therefore always disconnect the ac power cord be fore...

Page 58: ...ower supply module refer to Figure 3 5 and follow these steps 1 Make sure that power is removed from the bridge and the interface cables are disconnected Section 3 2 2 Make sure the ESD ground strap i...

Page 59: ...ter turn fasteners Section 3 3 3 2 9 Connect the interface cables then the power cord Section 3 2 10 Wait for self test to complete and check the state of the LEDs to ensure that the unit is operation...

Page 60: ...s 1 Remove the card cage from the bridge enclosure Section 3 3 3 1 2 Unplug the two fan assembly connectors P1 and P2 from the power supply module 3 Using a 2 Phillips head screwdriver unscrew the two...

Page 61: ...idge enclosure and tighten the two quar ter turn fasteners Section 3 3 3 2 7 Connect the interface cables then the power cord Section 3 2 8 Wait for self test to complete and check the state of the LE...

Page 62: ...ted Section 3 2 2 Make sure the ESD ground strap is attached 3 Make sure the power supply is properly screwed in place Then engage the backplane connector with the power supply fingers and snap it int...

Page 63: ...Figure 3 2 The bridge automatically powers up and runs self test when the power cord is plugged in Wait for self test to complete and check the state of the LEDs to ensure that the unit is working pr...

Page 64: ...eries unit the DECbridge 520 Figure 4 1 Typical DECbridge 500 600 Series Unit I O Panel Configuration switches Serial number AUI connector Address label FDDI connector s Module I D AC power connector...

Page 65: ...odels have a BNC connector for the ThinWire interface and a D connector for the AUI interface The DECbridge 600 series models have three D connectors for three separate AUI interfaces A standard IEC c...

Page 66: ...he switches and indicators on all DECbridge 500 600 series units Figure 4 2 Switches and Indicators LKG 5070 91I AP NI FI QM R R G G R Y G G G 2 AUI R G Y G 2 Y G 3 Y G 4 R R Y G G 1 PHY 1 R Y G PHY 1...

Page 67: ...lt Use current parameters parameters on power up parameters 3 Write access OFF Allow management write No management write FDDI Port 1 1 access on Port 1 access on Port 1 4 Write access OFF Allow manag...

Page 68: ...ccess Port 2 or 1 Performs the write access function de scribed above for Port 2 Switch 5 Write access Port 3 Performs the write access function for Port 3 It is applicable only with a 3 port NI 3 mod...

Page 69: ...Once this lamp check is complete the self test diagnosticsturntheLEDsofforleavethemonaccordingtothetestingsequence The functions of all LEDs in the DECbridge 500 600 series are described in Table 4 2...

Page 70: ...e AUI SELECT AUI Green On Off On NI port AUI interface selected Series 500 Off NI port ThinWire interface only selected EXT PWR OK Green On On AUI transceiver power OK In Series 500 not affected by AU...

Page 71: ...t or Link Confidence Test LCT failure retry loop Red Blink Illegal topology Off Port disabled via management Red green Blink Standby mode for this port when connected to concentrator PHY 2 B PHY 2 Gre...

Page 72: ...91I QM module AP or AP2 module FI module Note DECbridge 600 has a null FI module NI or NI3 module Non volatile memory 48 bit address ROMs Queue manager NI Chipset s NI packet memory Port A Port B DAS...

Page 73: ...is to service packets received from the FDDI link The queue manager is supported by a table lookup TLU unit which comparesaddressesofreceivedpacketswithaddressesstoredinthebridge saddress table The re...

Page 74: ...uitry The NI chips perform all IEEE 802 3 Ethernet MAC level func tions and also provide a direct memory access DMA to packet memory Because the FDDI and IEEE 802 3 Ethernet networks use different fra...

Page 75: ...ds then reapplying the ac power 4 3 5 2 Thermal Protection If the temperature inside the power supply is too high for normal operation the pow er supply protects itself by shutting down When the overt...

Page 76: ...onal firmware periodically check the status of the fans by reading this bit If the diagnostics detect a fan failure The FAN_BAD indicator remains on after the lamp check is complete If the diagnostics...

Page 77: ...e 4 3 Table 4 3 Physical Specifications Dimension Value Height 17 7 cm 6 9 in Width 44 2 cm 17 4 in Depth 36 5 cm 14 4 in Weight 14 5 kg 32 lbs 4 4 2 Electrical Specifications The DECbridge 500 600 se...

Page 78: ...must not exceed 50 C 122 F Table 4 5 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 We...

Page 79: ...m 164 ft maximum IEEE 802 3 Ethernet ThinWire Interface ThinWire cable length 185 m 606 ft maximum Recommended Multimode Fiber Interface Cable Cable length 2 km 6561 ft maximum Nominal core diameter 6...

Page 80: ...6 km 96 mi 2 km 1 2 mi Power budget contingent on core and cladding tolerances Recommended Single mode Fiber Interface Cable Cable length 40 km 24 8 miles maximum Mode field diameter 8 2 m to 10 5 m...

Page 81: ...and Extended LAN Reference guide for further information Bridges are used to interconnect single LAN segments into an extended LAN Each bridge starts a new single LAN segment The extended LAN can hav...

Page 82: ...delines on fiber optic cable plants refer to the DECconnect System Fiber Optic Installation guide and DECconnect Sys tem Fiber Optic Planning and Configuration guide A 3 Bridge to 802 3 Ethernet Guide...

Page 83: ...ansceiver cable BNE4x xx due to its smaller diameter has a signal loss that is four times that of the BNE3x xx transceiver cable If office transceiver cable is used the maximum transceiver cable dista...

Page 84: ...cable is 2 centimeters 75 inches No more than 30 stations are allowed on a segment The DEMPR if confi gured counts as one station In a DECconnect configuration with faceplates and satellite equipment...

Page 85: ...y be interconnected into legal topologies In the figure This Node is the reference point for all connection decisions Figure B 1 FDDI Connection Rules Matrix PHY port A B M S A B M S No Rule 1 Yes Yes...

Page 86: ...ecedence over the connection of PHY A of This Node to PHY M of another node When a connection between PHY A of This Node and a PHY M or PHY B of another node exists it is disabled when PHY B of This N...

Page 87: ...the bridge to the dual ring SAS versions of the bridge use a single MIC S connector to connect to a concentrator see Figure B 2 Figure B 2 FDDI Connector Keying A B A B M S M S LKG 5072 90I Connector...

Page 88: ...al s Fiber Distributed Data Interface FDDI how it works and the role of the individual FDDI components This guide also discusses Digital s approach to network management and the facilities provided by...

Page 89: ...System fiber optic structured wiring network along with test procedures for certifying the installation DECconnect System Planning and Configuration Order No EK DECSY CG Contains planning requirement...

Page 90: ...6 2 9 4 2 4 4 Configuration guidelines A 1 Configuration switches AUI ThinWire 2 8 4 5 Enable External Loopback 2 8 External Loopback Enable 4 5 list of 4 4 Manufacturing Mode 2 8 4 5 Restore Default...

Page 91: ...Incompatible firmware 2 2 2 10 Indicators 2 1 2 9 ACT 2 4 AUI_SELECT 2 4 DC_OK 2 4 2 14 description 4 6 EXT_PWR 2 4 FAN_BAD 2 6 2 14 FI_BAD 2 16 2 18 2 22 FRU_BAD 2 4 MODE 2 4 NI_BAD 2 18 2 22 PHY 2...

Page 92: ...ated documents C 1 Removing and replacing backplane 3 15 card cage 3 9 fan assembly 3 13 logic modules 3 5 power supply 3 11 Restore default parameters switch 4 4 S SAS bridges 1 3 A 1 Self test diagn...

Page 93: ...ECT MAIL ORDERS Canada DIGITAL EQUIPMENT OF CANADA LTD 940 Belfast Road Ottawa Ontario Canada K1G 4C2 Attn A SG Business Manager INTERNATIONAL DIGITAL EQUIPMENT CORPORATION A SG Business Manager c o D...

Page 94: ...usefulness of our publications Please rate this manual Poor Excellent Accuracy 1 2 3 4 5 Readability 1 2 3 4 5 Examples 1 2 3 4 5 Organization 1 2 3 4 5 Completeness 1 2 3 4 5 Did you find errors in...

Page 95: ...NECESSARY IF MAILED IN THE UNITED STATES BUSINESS REPLY LABEL FIRST CLASS PERMIT NO 33 MAYNARD MASS POSTAGE WILL BE PAID BY ADDRESSEE Telecommunications and Networks Publications 550 King Street Litt...

Page 96: ...Printed in U S A TM...

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