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DEC DECrepeater 90T+ Owner's Manual

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DECrepeater 90T and DECrepeater 90T+
Owner's Manual
Order Number: EK–DETMR–OM. C01
Digital Equipment Corporation
Maynard, Massachusetts

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  • Page 1 DECrepeater 90T and DECrepeater 90T+ Owner’s Manual Order Number: EK–DETMR–OM. C01 Digital Equipment Corporation Maynard, Massachusetts...
  • Page 2 The following are trademarks of Digital Equipment Corporation: BI, DEC, DECbridge, DECconnect, DEChub, DECmcc, DECnet, DECrepeater, DECserver, Digital, LAT, MicroVAX, ThinWire, ULTRIX, UNIBUS, VAX, VAX–11/780, VAX–11/785, VAX 3600, VAX 3900, VAX 6000, VAX 6400, VAX 9000,...

  • Page 3: Table Of Contents

    Contents About this Manual ........1 Overview Introduction .
  • Page 4 4 Managing the DECrepeater 90T and DECrepeater 90T+ Introduction ......... . 4–1 Functions .
  • Page 5 B Management Details Introduction ......... . B–1 Designating a Hub Manager .
  • Page 6 5–2 Troubleshooting a DECrepeater 90T and DECrepeater 90T+ Standalone Unit ....5–2 5–3 Troubleshooting a DECrepeater 90T and DECrepeater 90T+ in a DEChub 90 Backplane ..5–5 Physical Dimensions .

  • Page 7: About This Manual

    About this Manual Introduction This manual describes how to install, operate, and maintain the DECrepeater 90T and DECrepeater 90T+ repeaters. These repeaters are 9-port twisted-pair repeaters designed to function as standalone units or as managed units in the DEChub 90 backplane. The functionality of the DECrepeater 90T+ is the same as the DECrepeater 90T except that it supports shielded as well as unshielded twisted-pair cable.
  • Page 8 Conventions The following conventions are used in this manual: Convention Meaning Note Provides general information. A number in a black circle in text refers to the corresponding number in an accompanying illustration. In command descriptions, brackets indicate optional elements. Italic type Italic type emphasizes important information, indicates complete titles of documents, and in command descriptions, indicates a variable that...

  • Page 9: Overview

    Overview Introduction This chapter describes the DECrepeater 90T and DECrepeater 90T+ repeaters and briefly summarizes the features of these repeaters. Description The DECrepeater 90T and DECrepeater 90T+ are 9-port repeaters designed for the IEEE 802.3 standard CSMA/CD networks. The repeaters have one ThinWire port and eight twisted-pair ports.

  • Page 10: Features

    Figure 1–1 Sample DECrepeater 90T Configuration Workstation Workstation DECserver DECrepeater 90T DECrepeater 90C DECrepeater 90L Work Group ThinWire Segment DECbridge 90 Work Group Bridge Work Group Ethernet Backbone Computer 1 Computer 2 Server LJ-02765-TI0 When operating as a standalone unit, the repeater is an unmanaged repeater with a separate power supply connected to the repeater by a cable with a 7-pin connector.

  • Page 11: Leds And Connectors

    LEDs and Connectors The front panels on the DECrepeater 90T and DECrepeater 90T+ repeaters, although somewhat different in appearance, both contain the same indicator lights (LEDs) and connectors. These LEDs and connectors are shown in Figure 1–2 and Figure 1–3 and are described in Table 1–1. Figure 1–2 DECrepeater 90T LEDs and Connectors PJ-D1 20 REDUCE .4 5...

  • Page 12: Decrepeater 90T+ Leds And Connectors

    Figure 1–3 DECrepeater 90T+ LEDs and Connectors PJ - D120 R ED UCE .45 O RG LJ-02660-TI0 1–4 Overview...

  • Page 13: 1-1 Decrepeater 90T And Decrepeater 90T+ Leds And Connectors

    Table 1–1 DECrepeater 90T and DECrepeater 90T+ LEDs and Connectors DC OK monitors the voltage. On: The +5.0 Vdc voltage is normal. Off: The voltage is abnormal (as when a power failure occurs). Network activity indicator monitors the network activity. On: There is network activity.

  • Page 14: Configuring The Decrepeater 90T And Decrepeater 90T+ Repeaters

    Configuring the DECrepeater 90T and DECrepeater 90T+ Repeaters Introduction This chapter contains some of the basic configuration rules and guidelines that must be followed to correctly install the typical DECrepeater 90T and DECrepeater 90T+ configurations. For more detailed information about installing IEEE 802.3 compliant multisegment LANs, refer to Section 13 of the IEEE 802.3i-1990 standard.

  • Page 15: Network Constraints

    Network Constraints The overall network constraints are imposed by the following IEEE 802.3 rules: 1. The transmission path between any two DTEs may consist of up to five segments and four repeater sets. When a network consists of five segments and four repeater sets, a maximum of three of these segments may be mixing (coaxial) segments.

  • Page 16: Installation

    Installation Introduction Before you install the DECrepeater 90T and DECrepeater 90T+ repeaters, you should read this entire manual to become familiar with the features and configuration rules of the repeaters. If problems occur during installation, refer to Chapter 5, Troubleshooting. For additional information that may be useful during installation, refer to Appendix A, Specifications and Parts List.

  • Page 17: Mount The Decrepeater 90T And Decrepeater 90T+ On A Wall

    Mount the DECrepeater 90T and DECrepeater 90T+ on a Wall To install the DECrepeater 90T or DECrepeater 90T+ as a standalone wall-mount unit, use the following procedure: 1. Remove the cover (if necessary). a. Insert a small screwdriver into the top mounting hole on the cover (Figure 3–1).

  • Page 18: Mounting Screws

    Figure 3–2 Mounting Screws L J - 0 0 7 0 1 - T I 0 The screws should be tight enough to provide resistance if you try to remove the back cover from the wall. However, do not make them so tight that the cover is distorted or cannot be removed from the wall.

  • Page 19: Standalone Installation Connections

    4. Remove the back cover from the wall. 5. Attach the back cover to the repeater. 6. Mount the repeater onto the mounting screws. Standalone Installation Connections To make the standalone installation connections, use the following procedure and refer to Figure 3–3: 1.

  • Page 20: Standalone Installation

    Figure 3–3 Standalone Installation 5 0- O hm Ter mina to r T -C o nn e c tor Wo rkstation L J - 0 0 7 0 3 - T I 0 A Installation 3–5...

  • Page 21: Backplane Installation

    Backplane Installation To install a DECrepeater 90T or DECrepeater 90T+ in a DEChub 90 backplane, use the following procedure: 1. Remove the back cover (if necessary). a. Insert a small screwdriver into the top mounting hole located on the cover. b.

  • Page 22: Installing A Decrepeater 90T Repeater Into The Dechub 90 Backplane

    Figure 3–4 Installing a DECrepeater 90T Repeater into the DEChub 90 Backplane L J - 0 0 7 0 4 - T I 0 Installation 3–7...

  • Page 23: Shielded Twisted-Pair Environments

    Shielded Twisted-Pair Environments The DECrepeater 90T+ accommodates environments where shielded twisted-pair 10BaseT installations are required. The DECrepeater 90T+ has shielded MJ connectors, but retain the 100-ohm impedance environment. For installations that require 160-ohm line impedances, connections to the repeater should be made through a 10BaseT balun.

  • Page 24: Managing The Decrepeater 90T And Decrepeater 90T

    Managing the DECrepeater 90T and DECrepeater 90T+ Introduction This chapter provides information about managing the DECrepeater 90T and DECrepeater 90T+ repeaters on a network using the Maintenance Operations Protocol (MOP) for VMS or ULTRIX operating systems. This chapter also describes the management functions, commands, techniques, and messages. The repeaters are managed online using a DECbridge 90 series unit in a DEChub 90 backplane.

  • Page 25: Components Needed

    Components Needed You need the following components to manage a repeater online: • DEChub 90 backplane • DECbridge 90 work group bridge • DECrepeater 90T or DECrepeater 90T+ Accessing MOP from VMS Systems The MOP console carrier on a VMS operating system is included as part of the Network Control Program (NCP) facility, which requires a DECnet license.

  • Page 26: Accessing Mop From Ultrix Systems

    Example: If the bridge address is 08-00-2B-01-23-45 and the Ethernet circuit name is sva-0, a typical VMS system command line to establish the session from a VAXstation 3100 computer is: $ MCR NCP CONNECT VIA SVA-0 PHYSICAL ADDRESS 08-00-2B-01-23-45 Return When you establish the connection, the following message appears on the screen: Console connected (press CTRL/D when finished) Accessing a Bridge Repeatedly...

  • Page 27: Console Carrier User Interface

    After the name and node number are assigned, you can establish the link at any time using the ccr command: # ccr -n DBRG1 -h 08-00-2b-01-23-45 -c sva-0 Return In this example, the -h qualifier is followed by the station address of the DECbridge unit to be attached.

  • Page 28: Summary Of Decrepeater 90T And Decrepeater 90T+ Commands

    Table 4–2 Summary of DECrepeater 90T and DECrepeater 90T+ Commands Command Argument and Parameter DEFINE BRIDGE AGE age BRIDGE FLOOD ENABLE DISABLE BRIDGE HUB MANAGEMENT ENABLE DISABLE BRIDGE PASSWORD password string BRIDGE SPANNING TREE ENABLE DISABLE PORT port number ENABLE DISABLE PROTOCOL protocol number FILTER ALL protocol identifier...

  • Page 29: Description Of Command Parameters

    Table 4–2 (Cont.) Summary of DECrepeater 90T and DECrepeater 90T+ Commands Command Argument and Parameter PORT [hub number,]slot number,port number REPEATER [[hub number,]slot number] Description of Command Parameters A start index or stop index for an address is a decimal index into the work group forwarding database in the range of 1 to 200.

  • Page 30: Description Of Commands

    Description of Commands This section describes the commands used with the DECrepeater 90T and DECrepeater 90T+ repeaters. The examples used to explain the commands are based on the configuration shown in Figure 4–1. Figure 4–1 Sample Configuration DECb r id g e 9 0 DE Cserver 90L 08-00-2B-1D-07-21 08-00-2B-0F-19-23...
  • Page 31 DEFINE BRIDGE HUB_MANAGEMENT DISABLE SET BRIDGE HUB_MANAGEMENT DISABLE Disables all repeater management through the DECbridge 90 unit for repeater units in the DEChub 90 backplane. When disabled, you receive an error message with the SHOW REPEATER, SET PORT, or SHOW PORT commands on repeater ports.
  • Page 32 SET PORT [hub number,] slot number,port number DISABLE Disables the attachment of a specific repeater port in the DEChub backplane. The port status indicator on the selected repeater flashes, indicating that the port was disconnected by the network manager. There is no equivalent DEFINE command for disabling repeater ports.
  • Page 33 When the DECbridge 90 unit is used with a DECrepeater 90T or DECrepeater 90T+ repeater, the hub slot number and repeater port to which each station is attached will also appear on the screen. Note that it may take several minutes for the SHOW ADDRESS command to accurately reflect the correct repeater port number for stations recently added to the network or stations that have been moved from one port to another.
  • Page 34 SHOW PORT [hub number,] slot number, port number Shows whether the port is enabled or disabled and shows the operational status of the port. Hub numbers can be 1 or 2; slot numbers can be 1 to 8. For the DECrepeater 90T and DECrepeater 90T+, port numbers are 1 to 8;...
  • Page 35 Example 3: The response to a SHOW REPEATER command to an empty slot appears as follows: DECbridge>SHOW REPEATER 7 Return No repeater responds. Example 4: The response to a SHOW REPEATER command for a particular repeater appears as follows: DECbridge>SHOW REPEATER 3 Return Hub 1 slot 3 twisted pair, rev.1, 8 ports.

  • Page 36: Typical Management Techniques

    Typical Management Techniques The DECrepeater 90T and DECrepeater 90T+ can be managed in the following ways: • As standalone units using LEDs The repeaters come with LEDs that indicate system status in a standalone configuration. • Online within a group of repeaters installed in a DEChub 90 In a DEChub 90 environment, the repeaters may be managed using both LEDs and online management.

  • Page 37: Management Session

    Whether your configuration is a standalone or a DEChub 90 installation, you should create a network topology map to help facilitate management tasks. Figure 4–2 shows an example of a typical network topology map. Figure 4–2 Typical Network Topology Map DEChub 90 Slot 1 DECrepeater 90T...

  • Page 38: If Problems Are Reported

    2. Determine what stations are connected to the repeaters in the hub. DECbridge>SHOW ADDRESS Return Address 1: 08-00-2B-19-94-FB Address 2: 08-00-2B-1E-2D-0C hub 1 slot 5 port 3 This indicates that a station with address 08-00-2B-1E-2D-0C is connected to the repeater in slot 5 on port 3. At this point, without physical examination, you have enough information to construct a network map.

  • Page 39: To Disable A Port

    Table 4–3 (Cont.) Status Messages and Causes Message Most Common Cause Jabber Stations connected to this port continue to transmit; expect a faulty station. The operational condition is normal. All other conditions cause the repeater to automatically partition the port. When the condition clears, the repeater automatically reconnects the port and reports it as operational unless it is partitioned by management.

  • Page 40: Error Messages

    Error Messages Table 4–4 describes the DECbridge 90 messages. For a complete list of messages, refer to either the DECbridge 90 Owner’s Manual or the DECbridge 90FL Owner’s Manual. Table 4–4 DECbridge 90 Messages Error Message Description Address n: unused Address number n does not contain a station address.
  • Page 41 Table 4–4 (Cont.) DECbridge 90 Messages Error Message Description Hub h slot s not a repeater The device does not use the same management protocol as the repeaters. The device ports, if any, cannot be managed by the DECbridge 90 unit. Hub h slot s unrecognized The repeater type in hub h slot s is not known to the type...

  • Page 42: Standalone Configuration Management

    Standalone Configuration Management The recommended process for managing a small standalone network is as follows: 1. Maintain records indicating which stations are connected to each port on each repeater. It may be helpful to draw a network topology map (Figure 4–2). 2.

  • Page 43: Troubleshooting

    Troubleshooting Introduction This chapter provides troubleshooting information for the DECrepeater 90T and DECrepeater 90T+ when used as standalone units or when installed in the DEChub 90 backplane. Before you start to troubleshoot a problem: 1. Verify the installation of the repeater. The installation must meet the configuration rules provided in Chapter 2, Configuring the DECrepeater 90T and DECrepeater 90T+ Repeaters.

  • Page 44: Decrepeater 90T And Decrepeater 90T+ Standalone Troubleshooting

    Table 5–1 DECrepeater 90T and DECrepeater 90T+ Status Indicators Fault Non-Fault Port 0 off Open cables Port not connected. Shorted cables Cables not properly connected Cables not properly terminated Ports 0 to 8 – Partitioned by management. flashing Ports 1 to 8 off Open cables Port not connected.
  • Page 45 Table 5–2 (Cont.) Troubleshooting a DECrepeater 90T and DECrepeater 90T+ Standalone Unit If... Then... Do this... If the network activity LED still Turn the repeater off and fails to light on by unplugging and replugging the power supply in. Check that the network activity LED comes on momentarily.
  • Page 46 Table 5–2 (Cont.) Troubleshooting a DECrepeater 90T and DECrepeater 90T+ Standalone Unit If... Then... Do this... If the status LED for the Continue installing the connected port stays on and the other network cables for status LED for the unconnected each port that you are ports stay off, then the connected going to use.

  • Page 47: Decrepeater 90T And Decrepeater 90T+ Backplane Troubleshooting

    DECrepeater 90T and DECrepeater 90T+ Backplane Troubleshooting To troubleshoot a DECrepeater 90T or DECrepeater 90T+ installed in a DEChub 90 configuration, refer to Table 5–3 for a list of possible error conditions and the corrective action. Table 5–3 Troubleshooting a DECrepeater 90T and DECrepeater 90T+ in a DEChub 90 Backplane If...
  • Page 48 Table 5–3 (Cont.) Troubleshooting a DECrepeater 90T and DECrepeater 90T+ in a DEChub 90 Backplane If... Then... Do this... If the power LED turns See the troubleshooting procedures on when reseated in the DEChub 90 Owner’s in another slot, the Manual.

  • Page 49: A Specifications And Parts List

    Specifications and Parts List Introduction This appendix provides the specifications and a parts list for the DECrepeater 90T and DECrepeater 90T+ repeaters. Specifications for the repeaters are divided into the following categories: • Physical dimensions • Environmental (operating and shipping) specifications •...

  • Page 50: Environmental Specifications

    Environmental Specifications Table A–2 lists the operating environment specifications for the repeaters. Table A–2 Operating Environment Condition Value Temperature 5°C to 50°C (41°F to 122°F) Maximum rate of change 20°C/hr (36°F/hr) Relative humidity 10% to 95% (noncondensing) Wet-bulb temperature 32°C (90°F) maximum Dew point 2°C (36°F) minimum Altitude...

  • Page 51: Power Specifications

    Power Specifications Table A–4 lists the power specifications for the repeaters. Table A–4 Power Specifications Specification Value Voltage (domestic) 104 Vac to 128 Vac (nominal 120 Vac) Voltage (international) 208 Vac to 256 Vac (nominal 240 Vac) AC cord length 6 ft Current at 120 V .25 A...

  • Page 52: Mj Pin Assignments

    MJ Pin Assignments The following table lists the MJ pin assignments: Signal Not used Not used Not used Earth ground for DECrepeater 90T Not used for DECrepeater 90T+ MJ Connector Shield The DECrepeater 90T+ supports earth ground shield connection by using a shielded MJ connector and plug.

  • Page 53: B Management Details Introduction

    Management Details Introduction This appendix supplements the management information in Chapter 4, Managing the DECrepeater 90T and DECrepeater 90T+. It provides the following information for managing the repeaters in a DEChub backplane: • Designating a hub manager • Annotating the bridge address table •...

  • Page 54: Annotating The Bridge Address Table

    Only one DECbridge unit is allowed in the hub. If more than one is installed, only one is able to manage the repeaters. The other unit issues this message. If you do not want a specific DECbridge 90 series unit to be the designated hub manager, use the DEFINE BRIDGE HUB_MANAGEMENT DISABLE command to disable the hub management features.

  • Page 55: Using The Wgb Address Table For Work Group Management

    As a worst case example, if it takes 60 seconds for each of the recommended 200 stations to transmit a message, then it could take 200 minutes to complete the address database annotations. However, the DECbridge 90 unit tries to expedite the transmission as follows: •...

  • Page 56: C Documentation And Ordering Introduction

    Documentation and Ordering Introduction This appendix provides information about related documentation and ordering. Related Documentation You can order the following documents from Digital: Document Title Order Number DECbridge 90 Owner’s Manual EK-DEWGB-OM DECbridge 90FL Owner’s Manual EK-DEWGF-OM DEChub 90 Owner’s Manual EK-DEHUB-OM Open DECconnect Building Wiring Components EB-K2407-42...
  • Page 57 Telephone or Direct Mail Orders You can order documentation by phone or direct mail. If You Are From . . . Call . . . Or Write . . . U.S.A. DECdirect Digital Equipment Corporation Phone: 800–DIGITAL P.O. Box CS2008 (800–344–4825) Nashua, NH 03061 FAX: (603) 884–5597...

  • Page 58: Index

    Index Connector backplane, 1–5 port (MJ), 1–5 Address number, 4–6 port 0 network (BNC), 1–5 power, 1–5 Console carrier commands, 4–4 to 4–6 Backcover, 1–5 to establish a session from ULTRIX, Backplane 4–3 to 4–4 DEChub 90, 1–1 to establish a session from VMS, 4–2 installation, 3–6 to 3–7 to 4–3 Backplane connector, 1–5...
  • Page 59 Help command, 4–4 Network activity indicator, 1–5 Hub slot number, 4–6 Network Control Program (NCP), 4–2 Networks 10Base2, 1–1 10BaseT, 1–1 Indicators CSMA/CD, 1–1 DC OK, 1–5 network activity, 1–5 port 0 status, 1–5 ports 1 to 8, 1–5 Options Installation ordering, C–1 backplane, 3–6 to 3–7...
  • Page 60 Repeaters (cont’d) port, 1–1 operating environment, A–2 Troubleshooting physical dimensions, A–1 repeater in DEChub 90 backplane, 5–5 port numbers, 4–11 to 5–6 power specifications, A–3 repeater standalone, 5–2 to 5–4 replacement parts, A–4 Twisted-pair shipping environment, A–2 connections, 1–1 SHOW REPEATER command, 4–11 ports, 1–1 slot numbers, 4–11 shielded, 1–1, 3–8...

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