DEC DECrepeater 90T+ Manuel utilisateur

DECrepeater90TandDECrepeater90T+

Owner’sManual

Order Number: EK–DETMR–OM. C01

Digital Equipment Corporation

Maynard, Massachusetts

Third Edition, December 1992

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.

No responsibility is assumed for the use or reliability of software on equipment that is not supplied

by Digital Equipment Corporation or its afﬁliated companies.

Restricted Rights: Use, duplication, or disclosure by the U.S. Government is subject to restrictions

as set forth in subparagraph (c) (1) (ii) of the Rights in Technical Data and Computer Software

clause at DEFARS 252.227–7013.

Printed in U.S.A.

FCC NOTICE: The equipment described in this manual 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 the user at his own expense may be required to take measures to correct the

interference.

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,

VAXcluster, VAX DOCUMENT, VAXELN, VAXstation, VMS, VT, and the DIGITAL logo.

All other trademarks and registered trademarks are the property of their respective holders.

This document was prepared using VAX DOCUMENT, Version 2.1.

Contents

About this Manual ...................................... vii

1 Overview

Introduction . . . ....................................... 1–1

Description ........................................... 1–1

Features ............................................. 1–2

LEDs and Connectors . . . ............................... 1–3

2 Conﬁguring the DECrepeater 90T and

DECrepeater 90T+ Repeaters

Introduction . . . ....................................... 2–1

Conﬁguration Rules .................................... 2–1

Segment Length Constraints . . . ....................... 2–1

Network Constraints . ............................... 2–2

3 Installation

Introduction . . . ....................................... 3–1

Site Considerations .................................... 3–1

Standalone Installation . . ............................... 3–1

Mount the DECrepeater 90T and DECrepeater 90T+ on a

Wall............................................. 3–2

Standalone Installation Connections .................... 3–4

Backplane Installation . . . ............................... 3–6

Shielded Twisted-Pair Environments ....................... 3–8

iii

4 Managing the DECrepeater 90T and DECrepeater 90T+

Introduction . . . ....................................... 4–1

Functions ............................................ 4–1

Components Needed . . ............................... 4–2

Accessing MOP from VMS Systems . ....................... 4–2

Accessing MOP from ULTRIX Systems ..................... 4–3

Console Carrier User Interface ........................... 4–4

Console Carrier Command Language....................... 4–4

Description of Command Parameters .................... 4–6

Description of Commands ............................... 4–7

Typical Management Techniques . . . ....................... 4–13

Remote Network Management with the DECbridge 90 ...... 4–13

Management Disconnect . . . ....................... 4–13

Management Session ............................. 4–14

Example of a Typical Management Session ............ 4–14

If Problems are Reported . . . ....................... 4–15

To Disable a Port . ............................... 4–16

To Reset the Repeater ............................ 4–16

Error Messages ....................................... 4–17

Standalone Conﬁguration Management ..................... 4–19

5 Troubleshooting

Introduction . . . ....................................... 5–1

Port Partitioning ...................................... 5–1

DECrepeater 90T and DECrepeater 90T+ Standalone

Troubleshooting ....................................... 5–2

DECrepeater 90T and DECrepeater 90T+ Backplane

Troubleshooting ....................................... 5–5

A Speciﬁcations and Parts List

Introduction . . . ....................................... A–1

Physical Dimensions ................................... A–1

Environmental Speciﬁcations ............................. A–2

Power Speciﬁcations.................................... A–3

MJ Pin Assignments ................................... A–4

Parts List ............................................ A–4

B Management Details

Introduction . . . ....................................... B–1

Designating a Hub Manager ............................. B–1

Annotating the Bridge Address Table ...................... B–2

Using the WGB Address Table for Work Group Management .... B–3

C Documentation and Ordering

Introduction . . . ....................................... C–1

Related Documentation . . ............................... C–1

Ordering Information ................................... C–1

Index

Figures

1–1 Sample DECrepeater 90T Conﬁguration ........... 1–2

1–2 DECrepeater 90T LEDs and Connectors ........... 1–3

1–3 DECrepeater 90T+ LEDs and Connectors .......... 1–4

3–1 Removing the Back Cover ...................... 3–2

3–2 Mounting Screws ............................. 3–3

3–3 Standalone Installation . ....................... 3–5

3–4 Installing a DECrepeater 90T Repeater into the

DEChub 90 Backplane . . ....................... 3–7

4–1 Sample Conﬁguration . . ....................... 4–7

4–2 Typical Network Topology Map . . . ............... 4–14

Tables

1–1 DECrepeater 90T and DECrepeater 90T+ LEDs and

Connectors . . . ............................... 1–5

2–1 Segment Lengths ............................. 2–1

4–1 Ethernet Circuit Names for Systems .............. 4–2

4–2 Summary of DECrepeater 90T and DECrepeater 90T+

Commands . . . ............................... 4–5

4–3 Status Messages and Causes .................... 4–15

4–4 DECbridge 90 Messages . ....................... 4–17

5–1 DECrepeater 90T and DECrepeater 90T+ Status

Indicators ................................... 5–2

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

A–1 Physical Dimensions . . . ....................... A–1

A–2 Operating Environment . ....................... A–2

A–3 Shipping Environment . . ....................... A–2

A–4 Power Speciﬁcations........................... A–3

A–5 DECrepeater 90T and DECrepeater 90T+ Input ..... A–3

A–6 Parts List ................................... A–4

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.

In this manual, the term repeater may be used to denote both the

DECrepeater 90T and the DECrepeater 90T+ repeaters. When information is

unique to a speciﬁc repeater, the terms DECrepeater 90T and DECrepeater 90T+

are used.

Organization

This manual contains ﬁve chapters and three appendices.

Chapter Description

1 Provides an overview of the DECrepeater 90T and DECrepeater 90T+

and brieﬂy describes the features of these repeaters.

2 Describes the conﬁguration rules and conditions of operation for the

DECrepeater 90T and DECrepeater 90T+ in a ThinWire Ethernet

system or standard Ethernet network.

3 Describes how to install the DECrepeater 90T and DECrepeater 90T+.

4 Describes how to manage the DECrepeater 90T and DECrepeater 90T+

on a network.

5 Provides basic troubleshooting information.

Appendix A Provides the physical dimensions, environmental (operating and

shipping) speciﬁcations, electrical speciﬁcations, and a parts list.

Appendix B Provides more detailed information about management issues.

Appendix C Provides information about related documentation and ordering.

vii

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

you supply.

SHOW ADDRESS In text, commands are shown in all uppercase

letters to differentiate them from regular text.

For the VMS operating system, you can enter

commands in either uppercase or lowercase letters.

For the ULTRIX operating system, commands must

be entered as indicated in the examples.

DECbridge>

Text that the system displays on the screen is

shown in monospaced type.

SHOW REPEATER 1

Text that you enter is shown in bold monospaced

type.

Return A key name enclosed in a box indicates that you

press that key.

viii

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. The ThinWire port complies with the IEEE

802.3 standard for 10Base2 networks; the twisted-pair ports comply with the

IEEE 802.3 standard for 10BaseT networks.

The DECrepeater 90T twisted-pair ports support unshielded twisted-pair cable;

the DECrepeater 90T+ twisted-pair ports support both shielded and unshielded

twisted-pair cable. Installations that require a shielded 100-ohm twisted-pair

cable use a shielded MJ connector. Installations that require a 160-ohm shielded

media connection are accommodated by adding 10BaseT baluns. See Chapter 3,

Installation, for more information about shielded twisted-pair environments.

The repeaters can operate in standalone conﬁgurations or as managed repeaters

when installed in a DEChub 90 backplane with a DECbridge 90 series bridge.

Figure 1–1 shows a typical conﬁguration of the DECrepeater 90T repeater in an

Ethernet local area network (LAN).

Overview 1–1

Figure 1–1 Sample DECrepeater 90T Conﬁguration

DECrepeater 90C DECrepeater 90LDECrepeater 90T

Computer 2 ServerComputer 1

DECbridge 90

Work Group Bridge

Workstation DECserverPC Workstation

Ethernet Backbone

Work Group

Work Group ThinWire Segment

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. The auto-ranging power supply is modular and accommodates either a

North American 120-volt or an international 240-volt wall outlet.

Features

The following list summarizes the features of the DECrepeater 90T and

DECrepeater 90T+ repeaters:

• One ThinWire (10Base2) port

• Eight twisted-pair (10BaseT) ports

• Standalone or installable in a DEChub 90 backplane

• Manageable when installed in a DEChub 90 backplane

For detailed information about how to conﬁgure the repeaters, see Chapter 2,

Conﬁguring the DECrepeater 90T and DECrepeater 90T+ Repeaters. For detailed

information about how to install the repeaters, see Chapter 3, Installation.

1–2 Overview

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