1. Manuals
  2. Brands
  3. Digital Equipment Manuals
  4. Network Hardware
  5. DECbridge 500 Series
  6. Problem solving

Digital Equipment DECbridge 500 Series Problem Solving

Hide thumbs
Table of Contents

Advertisement

Quick Links

Download this manual
™
DECbridge
500/600 Series
Problem Solving
Order Number: EK-DEFEB-PS-002

Advertisement

Table of Contents
loading
Need help?

Need help?

Do you have a question about the DECbridge 500 Series and is the answer not in the manual?

Questions and answers

Subscribe to Our Youtube Channel

Related Manuals for Digital Equipment DECbridge 500 Series

Summary of Contents for Digital Equipment DECbridge 500 Series

  • Page 1 ™ DECbridge 500/600 Series Problem Solving Order Number: EK-DEFEB-PS-002...
  • Page 2 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. NOTICE – Class A Computing Device: This equipment generates, uses, and may emit radio frequency energy.
  • Page 3 ™ 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.
  • Page 4 JULY 1991 The information in this document is subject to change without notice and should not be construed as a commitment by Digital Equipment Corporation. Digital Equipment Corporation assumes no respon- sibility for any errors that may appear in this document.

  • Page 5: Table Of Contents

    Contents Safety Preface Introduction General Description ........1–1 Problem Solving Introduction...
  • Page 6 Removal and Replacement Procedures Introduction ......... 3–1 Preparing the Bridge for Servicing .
  • Page 7 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...
  • Page 8 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...
  • Page 9 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.
  • Page 10 The warnings and cautions that must be observed for the hardware described in this manu- 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 apply power to the unit unless the card cage assembly is fully inserted in the bridge enclosure.
  • Page 11 WARNING Lethal exposed voltages exist in the power supply. Therefore, always disconnect the ac power cord before removing or replacing any FRUs. Do not apply power to the bridge unless the card cage is fully inserted in the bridge enclosure. Only qualified service engineers should perform any FRU removal and replacement procedures.
  • Page 12 WARNING Some fiber optic equipment can emit laser light that can injure your eyes. Never look into an optical fiber, connector, or connector port. (Page 3-4) VORSICHT Schauen Sie niemals direkt in ein Glasfaserkabel oder einen Glas- faseranschluß. Die Laserstrahlen in faseroptischen Ger ten können Augenverletzungen verursachen.
  • Page 13 PRECAUCION Los m dulos del puente pueden ser dañados por descargas elec- troestáticas (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 reparaci n (P/N 29-11762-00) se incluye una muñequera antiestática, un cable de tierra y una tabla.
  • Page 14 CAUTION The card cage weighs approximately 11 kg (24 pounds). Support it well and handle it carefully during removal to avoid dropping it. (Page 3-9) ACHTUNG Wenn Sie das Kartenmagazin entfernen, bedenken Sie, daß es 11 kg wiegt. St tzen Sie es mit einer Hand von unten ab, und achten Sie darauf, daß...

  • Page 15: Preface

    Preface This manual describes how to troubleshoot and service the DECbridge 500/600 se- ries of bridges. Information includes a product overview and list of the various mod- els, problem-solving methods, removal and replacement procedures, and guidelines for configuring the units. Intended Audience This manual is intended primarily for qualified service personnel who will be re- pairing the bridge to the field-replaceable unit level.
  • Page 16 Chapter 3 Describes how to remove and replace all field-replaceable units (FRUs). Chapter 4 Contains technical information about the DECbridge 500/600 series. Includes a description of the product; 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/Ethernet network.

  • Page 17: Introduction

    Introduction 1.1 General Description The DECbridge 500/600 series units (shown in Figure 1–1) provide the interconnec- tion 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 network DECbridge 62x DECconcentrator 500...

  • Page 18: Decbridge 500/600 Series Units

    These bridges are store-and-forward devices. That is, they receive and store packets from the FDDI ring and IEEE 802.3/Ethernet network segments, then selectively fil- ter (discard) the packets or forward them to the appropriate network. As shown in Table 1–1, various network interfaces are available, depending on the particular bridge model.

  • Page 19: Typical Decbridge 500/600 Series Unit (I/O Panel)

    DECbridge 600 model has no FDDI connector. • All DECbridge 500 series 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.

  • Page 20: Logic Modules Used In The Decbridge 500/600 Series

    All DECbridge 500/600 series units contain four logic modules: • AP or AP2 (Application Processor) module • NI or NI(3) (Network Interface) module • FI (Fiber Interface) module with various types of interfaces • QM (Queue Manager) module Table 1–2 shows the four logic modules contained in each bridge model. NOTE In this manual, the terms AP and NI are used as general references to the Application Processor and Network...

  • Page 21: Problem Solving

    Problem Solving 2.1 Introduction This chapter describes several problem-solving procedures that can help diagnose failures and isolate faulty field-replaceable units (FRUs) in the DECbridge 500/600 series. To aid you in this task, the DECbridge 500/600 series contains the following problem-solving features: •...

  • Page 22: Normal Power Up

    2.2 Normal Power Up When power is first applied to the bridge, a series of self-test diagnostics, resident on the AP/AP2 module, is performed. These tests verify the operation of the bridge hardware before calling the operating system firmware and connecting the bridge to the network.

  • Page 23: Led Indicators After Power Up

    Figure 2–1: LED Indicators After Power Up LED Indicators NI(3) Null PHY 1 PHY 1 PHY 2 Legend – On – On or Off – Flashing – Off LKG-5057–91I Problem Solving 2–3...

  • Page 24: Self-Test Diagnostics (Overview)

    FDDI network.) • On any DECbridge 500 series unit, the AUI_SELECT indicator will be on (solid green) 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 selects the Thin- Wire interface.)

  • Page 25: Recommended Approach To Problem Solving

    Once the core test establishes that the hardware can perform basic operations, more extensive tests for the logic modules are executed. When the entire self-test is com- plete (approximately 1 minute), FRU pass/fail indications are given by the state of the indicators on the I/O panel.

  • Page 26: Problem-Solving Tools And Components

    2.4.1 Problem-Solving Tools and Components The following equipment is used to test the DECbridge 500/600 series: • Unattenuated FDDI loopback connector (P/N 12-32005-01) for FDDI multi- mode port • Single mode attenuated loopback connector (P/N 12-34830-01) • AUI loopback connector(s) (P/N 12-32005-01) •...

  • Page 27: Visually Inspecting The Bridge

    Figure 2–2: Visually Inspecting the Bridge Problem Solving 2–7...
  • Page 28 – The AUI/ThinWire switch (switch 8) in a DECbridge 500 series unit is in the ON (down) position if the AUI interface is used, or in the OFF (up) position if the ThinWire interface is used.

  • Page 29: Interpreting The Led Indicators

    2.4.4 Interpreting the LED Indicators Pass/fail results from the diagnostics are displayed on the LED indicators. Table 2–1 lists typical LED displays for various error conditions, along with probable causes and suggested corrective actions. The flow chart in Figure 2–3 indicates steps you can take to determine why a bridge is in the powered-down state.
  • Page 30 Table 2–1 (Cont.): Problem Solving Via the LEDs Symptom Probable Cause Corrective Actions All LEDs are off (cont.). Bad fan or Remove ac power for at least 15 seconds, then overtemperature reapply. If LEDs work properly for a few minutes, condition then all turn off again, replace the fan assembly.
  • Page 31 Table 2–1 (Cont.): Problem Solving Via the LEDs Symptom Probable Cause Corrective Actions FAN FAULT on. Fan connections Check fan cable connections at the power supply. Fan failure Replace fan assembly (Section 3.3.5). Fan power failure Replace power supply module (Section 3.3.4). DC_OK off.
  • Page 32 Table 2–1 (Cont.): Problem Solving Via the LEDs Symptom Probable Cause Corrective Actions FI Module LEDs: FI_BAD remains on External Loopback Check the Enable External Loopback switch. (and AP_BAD is off). switch The switch must be in the OFF (up) position for normal bridge operation.

  • Page 33: If The Problem Still Exists

    Table 2–1 (Cont.): Problem Solving Via the LEDs Symptom Probable Cause Corrective Actions PHY_1 or 2 solid red Port failed Line Test is continuously repeated at 0.5, 5, and 50 (and FI_BAD off). Confidence Test second intervals until it passes. If error condition (LCT) persists, perform loopback test, as described in Section 2.4.6.

  • Page 34: Problem Solving A Power-Off Condition

    Figure 2–3: Problem Solving a Power-Off Condition Bridge power is off (all LEDs are off). Ensure that power cord is connected to a live AC outlet. Reset it. If it trips again, Circuit breaker replace the power sup- tripped? ply and retest. Remove power cord for 15 sec, then reapply.

  • Page 35: Problem Solving The Fddi Interface

    Figure 2–4: Problem Solving the FDDI Interface PHY_n Normal condition, solid end problem solving. green Cycle power and wait for self-test to complete. Loopback Loopback FI_BAD Install loopback switch connector connector. enabled installed Replace FI board. PHY_n Bad LED. Replace FI module.
  • Page 36 Figure 2–4 (Cont.): Problem Solving the FDDI Interface Loopback Test Turn power off. Install loopback connectors and set loopback switch on (Section 2.4.5). Turn power on and wait about 1 minute for self-test to complete. FI_BAD Replace FI module and retest. Remove loopback connectors and reset loopback switch to off.
  • Page 37 Figure 2–4 (Cont.): Problem Solving the FDDI Interface If you have not already done so, replace FI module and retest. If failure persists, a Reconnect FI and Rx power network topology NI cables. problem may exist. Contact your system/ network manager. Reconnect FI and NI cables (Verify Rx power and cable loss.)

  • Page 38: Performing Loopback Testing

    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 the AUI and ThinWire interfaces are tested but only the selected interface has any effect on the NI_BAD indicator.). If an optional optical bypass switch is installed, the self-test diagnostics also check the relay driver on the FI module.

  • Page 39: Installing The Fddi Loopback Connector(S)

    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 Single-mode...

  • Page 40: Installing The Ni Loopback Connector(S)

    For a ThinWire interface, install the T-connector (P/N 12-25869-01) and terminator (P/N 12-26318-01). 3. On DECbridge 500 series units, verify that the AUI/ThinWire switch (config- uration switch 8) is in the correct position: ON (down) for testing the AUI interface and OFF (up) for testing the ThinWire interface.

  • Page 41: Installing The Ni Loopback Connectors

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

  • Page 42: Running The Loopback Test And Observing The Results

    2.4.6.4 Running the Loopback Test and Observing the Results 1. Reconnect the power cord to the ac outlet. 2. Observe the state of the LED indicators on the FI module after the self-test diagnostic is complete. – If the FI port fault disappears (that is, if the FI_BAD indicator turns off, measure the transmit power and receive power at the bridge using the SDU power meter (Section 2.4.7).

  • Page 43: Measuring The Fi Power

    2.4.7 Measuring the FI Power If a failure in the FI port disappears when an FI loopback test is performed, check the optical signals into and out of the port to determine if they are within specifications. To measure the power levels of the transmit and receive optical signals at the bridge, use the SDU optical power meter kit (P/N 29-28384-01).

  • Page 44: Measuring The Fi Transmit Power (Multimode)

    c. The power level of the transmit signal will be displayed on the meter. Record the value in Table 2–2. d. Disconnect the receive cable from the bridge and from the meter. Figure 2–7: Measuring the FI Transmit Power (Multimode) Tester (receive) cable...

  • Page 45: Measuring The Fi Receive Power (Multimode)

    b. Plug the output connector on that cable into the test head of the meter. (Note: The output connector is the smaller of the two connectors on the cable.) Figure 2–8: Measuring the FI Receive Power (Multimode) Normal connection FDDI cable to bridge Receive signal...

  • Page 46: Fddi Transmit And Receive Power Calculation

    Table 2–2 shows a sample table that you can use to record the receive and transmit power for the bridge (station A) and for the upstream device (sta- tion B). You can also use the table to record the cable loss between the two stations (the transmit power at one station minus the receive power at its downstream station).

  • Page 47: Removal And Replacement Procedures

    Removal and Replacement Procedures 3.1 Introduction This chapter contains removal and replacement procedures for the field-replaceable units (FRUs) in the DECbridge 500/600 series units. The modular design of these bridges allows quick removal and replacement of defective components. The re- placeable components are shown in Figure 3–1.

  • Page 48: Decbridge 500/600 Series Field-Replaceable Units

    Figure 3–1: DECbridge 500/600 Series Field-Replaceable Units Bridge enclosure* Backplane Power supply module Card cage assembly* Fan assembly AP/AP2 module NI/NI(3) module FI module QM module Not a field-replaceable unit LKG-5064-90I 3–2 DECbridge 500/600 Problem Solving...

  • Page 49: Preparing The Bridge For Servicing

    54-19375-01 DECbridge 500 only AP2 module 54-19375-02 All models except DECbridge 500 NI module 54-19373-01 All DECbridge 500 series NI(3) module 54-19409-01 All DECbridge 600 series FI modules -SAS multimode 54-19369-01 DECbridge 500, 510, 610 -DAS multimode (A and B)

  • Page 50: Power Cord And Interface Cable Removal

    WARNING Some fiber optic equipment 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 Single-mode fiber optic cable AUI cable ThinWire T–connector ThinWire...

  • Page 51: Removing And Replacing The Frus

    3.3 Removing and Replacing the FRUs Logic modules are removed directly from the bridge and do not require the prior re- moval of any other assembly. The removal of the other FRUs requires first removing the card cage assembly from the bridge enclosure for access. WARNING Lethal exposed voltages exist in the power supply.

  • Page 52: Removing Logic Modules

    3.3.2.1 Removing Logic Modules To remove any of the four logic modules, refer to Figure 3–3 and follow these steps: NOTE Before removing the AP/AP2 module, record the exist- ing switch settings on that module so that you can set the switches on the replacement module to the appropriate positions.

  • Page 53: Replacing Logic Modules

    Figure 3–3: Logic Module Removal and Replacement Quarter-turn Quarter-turn fastener (2) AP/AP2 module NI/NI(3) module Ejector FI module lever (2) QM module Locked Unlocked LKG-5067–91I 3.3.2.2 Replacing Logic Modules To make sure you have the correct replacement module, check the name of that mod- ule on the left side of the module handle.
  • Page 54 To replace a logic module, refer to Figure 3–3 and follow these steps: 1. Verify that the replacement module is at the same revision or a higher revi- sion than the failed module. 2. If an AP/AP2 module is being replaced: –...

  • Page 55: Removing And Replacing The Card Cage

    3.3.3 Removing and Replacing the Card Cage To gain access to the fan assembly, power supply, or backplane, you must first re- move the card-cage assembly from the bridge enclosure. 3.3.3.1 Removing the Card Cage CAUTION Do not leave the card cage partially withdrawn for serv- icing.

  • Page 56: Replacing The Card Cage

    Figure 3–4: Card Cage Removal and Replacement 3.3.3.2 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 cables are disconnected (Section 3.2).

  • Page 57: Removing And Replacing The Power Supply

    3. Firmly grasping each side of the card cage, align the runners on the card cage bottom with the guides in the bridge enclosure. Then, carefully push the card- cage into the enclosure. 4. Tighten the two quarter-turn fasteners to lock the card cage in place. 5.

  • Page 58: Replacing The Power Supply

    5. Use the small plastic handles on the power supply module to pull it forward out of its backplane connector, then lift the power supply module to remove it. 3.3.4.2 Replacing the Power Supply To replace the power supply module, refer to Figure 3–5 and follow these steps: 1.

  • Page 59: Removing And Replacing The Fan Assembly

    4. Use the plastic handles on each side of the power supply module to push (or pull) the module into the backplane connector. You may find it easier to ori- ent the unit so that the backplane is towards you, and then pull the power sup- ply module into the backplane connector, rather than push it in.

  • Page 60: Removing The Fan Assembly

    3.3.5.1 Removing the Fan Assembly To remove the fan assembly, refer to Figure 3–6 and follow these steps: 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.

  • Page 61: Replacing The Fan Assembly

    3.3.5.2 Replacing the Fan Assembly To replace the fan assembly, refer to Figure 3–6 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 is attached. 3.

  • Page 62: Removing The Backplane

    3.3.6.1 Removing the Backplane To remove the backplane, refer to Figure 3–7 and follow these steps: 1. Remove the card cage from the bridge enclosure (Section 3.3.3.1). 2. Disengage the four modules from the backplane connector (Section 3.3.2.1). 3. Disengage the backplane connector from the power supply fingers and re- move the backplane.

  • Page 63: Backplane Removal And Replacement

    8. Connect the power cord (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 properly (Section 2.2).

  • Page 64: Technical Information

    Technical Information 4.1 Physical Description Figure 4–1 shows the I/O panel of a typical DECbridge 500/600 series unit (the DECbridge 520). Figure 4–1: Typical DECbridge 500/600 Series Unit (I/O Panel) Configuration switches Model Circuit breaker Serial number number AC power Address label connector o o o...
  • Page 65 The I/O panel of the DECbridge 500/600 series units contains the following compo- nents: • Fiber optic connector(s) for the FDDI interface – DAS models have one FDDI type A and one type B connector; SAS models have one type S con- nector;...

  • Page 66: Decbridge 500/600 Series Switches And Indicators

    4.2 DECbridge 500/600 Series Switches and Indicators Figure 4–2 shows the location of the switches and indicators on all DECbridge 500/600 series units. Figure 4–2: Switches and Indicators Configuration switches 1 2 3 4 5 6 7 8 LED Indicators AP/AP NI(3) Null...

  • Page 67: Circuit Breaker

    4.2.1 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 and ac power is removed from the bridge. To reset the circuit breaker, push in the white center portion of the breaker.

  • Page 68: Thinwire Interface

    • Switch 1 – Manufacturing mode – 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. Always recycle ac power to the bridge after changing this switch setting.

  • Page 69: Indicators

    4.2.3 Indicators The LED indicators are located on the four logic modules and are visible from out- side the unit. In general, green LEDs indicate the presence of power and show the state of each port; red LEDs indicate a fault; and yellow LEDs indicate the presence of activity on a communications link.
  • Page 70 Table 4–2 (Cont): LED Indicators Symbol Color Normal Description NI or NI(3) Module: NI BAD -- Self-test failed -- Self-test passed Blink -- Incompatible firmware loaded ACTn Yellow On/Off -- NI port(n) carrier present (n= 2, 3, or 4) -- NI port(n) carrier not present FWDn Green -- NI port(n) in forwarding state...
  • Page 71 Table 4–2 (Cont): LED Indicators Symbol Color Normal Description PHY 1 (A) PHY 1 Green -- PHY connection complete Green Blink -- PHY connection in progress -- Broken port or Link Confidence Test (LCT) failure retry loop Blink -- Illegal topology -- Port disabled via management Red/green Blink -- Standby mode for this port...

  • Page 72: Block Diagram Description

    4.3 Block Diagram Description Figure 4–3 shows a simplified block diagram of the four logic modules in the DECbridge 500/600 series. Figure 4–3: Simplified Block Diagram QM module AP (or AP2) module Non-volatile memory Volatile Application memory processor Queue manager 48-bit address ROMs...

  • Page 73: Ap2 (Or Ap) Module Description

    (read/write) memory is used for storing downline loaded programs, bridge parameters and error logs. The DECbridge 500 series has one address ROM to store the 48-bit physical address of the bridge. The DECbridge 600 series has two address ROMs: one stores the ad- dress of Port 1, and the other stores the address of Port 3.

  • Page 74: Ni Module Description

    4.3.4 NI Module Description The Network Interface (NI) module provides the interface to the IEEE 802.3/Ether- net network(s). Major components on this module are the NI packet memory, the NI chipset, and the translation processor. In addition, the NI3 module contains a for- warding processor.

  • Page 75: Power Supply Shutdown

    The power supply also provides the following features: 4.3.5.1 Power Supply Shutdown If an overvoltage condition occurs at any of the power-supply outputs, the entire power-supply shuts down. The power supply outputs become latched and will NOT automatically recover even if the cause of the overvoltage condition is removed. To reset the supply and resume normal operation, you must cycle power by removing ac power to the unit, waiting at least 10 seconds, then reapplying the ac power.

  • Page 76: Fan Assembly

    4.3.6 Fan Assembly The fan assembly provides the air flow used to cool the bridge. The assembly con- tains two fans and is located on the left side of the card cage. A circuit on the AP2 module monitors the rotation of the fans and sets a fan failure bit (in the AP2 module) whenever the fan is rotating too slowly or not at all.

  • Page 77: Product Specifications

    4.4 Product Specifications This section contains the physical, electrical, environmental, and cabling specifica- tions for the DECbridge 500/600 series. 4.4.1 Physical Specifications The DECbridge 500/600 series can be rackmounted or used on a desktop or shelf. The physical dimensions of the unit are listed in Table 4–3. Table 4–3: Physical Specifications Dimension...

  • Page 78: Environmental Specifications

    4.4.3 Environmental Specifications The DECbridge 500/600 series is designed to operate in an open office environment, equipment room, or in an exposed area of an industrial site. The bridge is not de- signed for operation in an air plenum. Table 4–5 lists the environmental specifica- tions of the bridge.

  • Page 79: Cabling Specifications

    4.4.4 Cabling Specifications Table 4–6 lists some of the specifications for the power cable, IEEE 802.3/Ethernet cable, and FDDI cable. Table 4–6: Cable Specifications Item Value Power: AC power cord length 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...
  • Page 80 Table 4–6 (Cont): Cable Specifications Item Value Alternate Multimode Fiber Interface Cable: 100/140 50/125 Cable length 2 km (6561 ft) maximum 2 km (6561 ft) maximum µ ± µ µ ± µ Nominal core diameter µ ± µ µ ± µ...

  • Page 81: Configuration Guidelines

    IEEE 802.1d and LAN Bridge 100 spanning tree loop detection modes. This is especially important in networks that contain bridges that are not manufactured by Digital Equipment Corporation. Refer to the Bridge and Extended LAN Reference guide for further information.

  • Page 82: Bridge-To-802.3/Ethernet Guidelines

    Fiber Optic Planning and Configuration guide. A.3 Bridge-to-802.3/Ethernet Guidelines DECbridge 500 series units can be connected to an IEEE 802.3/Ethernet network through either an AUI interface or a ThinWire interface. DECbridge 600 series units can be connected to three individual IEEE 802.3/Ethernet network segments through three separate AUI interfaces.
  • Page 83 • Maximum length of the transceiver cable cannot exceed 50 meters (164 feet). This maximum length can be decreased due to the internal cabling equivalen- cy of a device (such as a DELNI) that is connected between the bridge and the transceiver, or due to the use of an office transceiver cable.
  • Page 84 A.3.2 ThinWire Interface The following rules and guidelines are for connecting a DECbridge 500/600 series unit to an IEEE 802.3/Ethernet network via the ThinWire interface. • The maximum length for a continuous segment of ThinWire cable is 185 me- ters (606.9 feet). •...

  • Page 85: Fddi Connection Information

    FDDI Connection Information B.1 FDDI Connection Rules The FDDI connection rules are defined in Figure B–1. 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–1: FDDI Connection Rules Matrix This Node PHY port...
  • Page 86 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: •...

  • Page 87: Fddi Connector Keying

    B.2 FDDI Connector Keying The DECbridge 500/600 series uses the following FDDI connector types: • Media Interface Connectors (MIC) for multimode type connections • FC/PC for single-mode type connections The MICs are designed to align the fiber cable properly with the transmit and receive optics —...

  • Page 88: Related Documents

    Related Documents Additional information relating to problem-solving the DECbridge 500/600 series can be found in the following documents. Ordering information is provided at the back of this manual. • DECbridge 500/600 Series Installation and Upgrade (Order No. EK-DEFEB-IN) Explains how to install the DECbridge 500/600 series units, how to verify their operation once installed, and how to upgrade from one model to another.
  • Page 89 • DECconcentrator 500 Problem Solving (Order No. EK-DEFCN-PS) Explains how to troubleshoot and service the DECconcentrator 500 unit. In- cludes a product overview, problem-solving methods, and removal and re- placement procedures for field-replaceable units (FRUs). • DECconnect System Fiber Optic Planning and Configuration (Order No.
  • Page 90 Index Configuration guidelines, A–1 Configuration switches Address label, 4–2 AUI/ThinWire, 2–8, 4–5 Address ROMs, 3–8 Enable External Loopback, 2–8 AP/AP2 module, 4–10 External Loopback Enable, 4–5 AUI interface list of, 4–4 cable, 2–11 Manufacturing Mode, 2–8, 4–5 connections, A–2 Restore Default Parameters, 4–5 AUI/ThinWire typical settings, 2–8 ports, 1–3...
  • Page 91 DESTA, A–2 FI_BAD, 2–16, 2–18, 2–22 Dual attachment station (DAS), 1–2 FRU_BAD, 2–4 Dual homing, B–2 MODE, 2–4 NI_BAD, 2–18, 2–22 PHY, 2–4 Insulator, 3–12 Ejector levers, 3–6 Enable external loopback switch, 4–4 Keying (FDDI connector), B–3 Error log, 2–14 ESD ground strap, 3–5 Lamp check, 2–2 Line Confidence Test (LCT), 2–13...
  • Page 92 Optical power meter, 2–6, 2–23 power supply, 3–11 Overtemperature condition, 2–6, 2–10, Restore default parameters switch, 4–4 2–14, 4–12 SAS bridges, 1–3, A–1 Parameters, recording of, 2–5 Self-test diagnostics, 2–1, 2–2 ports, B–1 manufacturing mode, 2–5 Power calculation (FI), 2–26 normal mode, 2–5 Power measurement (FI), 2–23 overview, 2–4...
  • Page 93 Digital’s local subsidiary or approved distributor Internal orders should be placed through Publishing and Circulation Services (P&CS), Digital Equipment Corporation, 10 Forbes Road, Northboro, Massachusetts 01532–2597 *Any prepaid order from Puerto Rico must be placed with the Local Digital Subsidiary:...
  • Page 94 DECbridge 500/600 Series Problem Solving EK-DEFEB-PS-002 READER’S COMMENTS What do you think of this manual? Your comments and suggestions will help us to improve the quality and usefulness of our publications. Please rate this manual: Poor Excellent Accuracy Readability Examples Organization Completeness Did you find errors in this manual? If so, please specify the error(s) and page number(s).
  • Page 95 DO NOT CUT – FOLD HERE AND TAPE NO POSTAGE 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 Littleton, MA 01460–1289 DO NOT CUT –...
  • Page 96 Printed in U.S.A.

This manual is also suitable for:

Decbridge 600 seriesDecbridge 520Decbridge 524Decbridge 526Decbridge 528Decbridge 610 ... Show all

Table of Contents