Cabletron Systems MT8-MIM User manual

IRM3

INTELLIGENT REPEATER

MODULE

USER’S GUIDE

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IRM3 QUICK REFERENCE CARD

IRM3 User’s Guide Part of 9030494 -01

LED INDICATORS

LED Description

PWR IRM3 is receiving power from MMAC.

BOK LED lit-Board is operating properly.

LED not lit-Initialization problem. Press

Reset switch.

RCV IRM3 is repeating packet received from a

connected segment.

MGMT IRM3 is receiving/transmitting management

packets.

CLN Collision detected on a segment.

POK Internal repeater port is OK.

ON (AUI) AUI port is active repeater port.

PWR (AUI) AUI port is receiving power.

ON (FO) Fiber Optic port is active repeater port.

LNK (FO) Link is established between port and Fiber

Optic device.

CONNECTIONS

AUI Port: 15-pin D type receptacle

Pin Signal Pin Signal Pin Signal

1 Logic Ref 6 Power Return 11 Logic Ref

2 Collision+ 7 No Connection 12 Receive-

3 Transmit+ 8 Logic Ref 13 Power (+12Vdc)

4 Logic Ref 9 Collision- 14 Logic Ref

5 Receive+ 10 Transmit- 15 No Connection

Console/Modem Port: Standard 9-pin RS232 port

Pin Signal Pin Signal

1 Carrier Detect (CD) 6 Receive Clock (RXCL)

2 Transmit (TXD) 7 Request to Send (RTS)

3 Receive (RXD) 8 Clear to Send (CTS)

4 Data Terminal Ready (DTR) 9 Ring Indicator (RI)

5 Logic Ref

IRM3

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IRM3 QUICK REFERENCE CARD

Part of 9030494-01 IRM3 User’s Guide

JUMPER SETTINGS

Jumper Function Setting Default

H1 Enables/Disables Battery.

When enabled, user-entered

parameters are saved if power

to the IRM3 fails. When

disabled, parameters are lost.

Enable: Jumper over pins

1 and 2

Disable: Jumper over pins

2 and 3

Disable

JP1 Makes IRM3 compatible with

any THN-MIMs being used in

the MMAC. This jumper is set

for THN-MIMs with part

numbers 9000043-06 and

above and for THN-MIMs with

part numbers below

9000043-06.

9000043-06 and up:

Jumper over pins 2 and 3

Below 9000043-06:

Jumper over pins 1 and 2

If using both, set over 1

and 2

Jumper

over pins 2

and 3

H6

and H8

Sets IRM3 console and modem

ports for either internal (signal

generated by IRM3) or external

(signal generated by attached

device) Request to Send (RTS)

and Clear to Send (CTS)

signals.

Internal: Jumper over pins

1 and 2

External: Jumper over

pins 2 and 3

External

H1

JP1

H2

H3

H4

H5

H8

H6

Battery

Enable/Disable

THN-MIM Jumper

CTS-Modem Port

CTS-Console Port

For Cabletron Use Only

0494104

1 2 3

1

2

3

H1/JP1

Pin Numbers

H6/H8

Pin Numbers

IRM3 User’s Guide i

NOTICE

Cabletron Systems reserves the right to make changes in speciﬁcations and other information

contained in this document without prior notice. The reader should in all cases consult Cabletron

Systems to determine whether any such changes have been made.

The hardware, ﬁrmware, or software described in this manual is subject to change without notice.

IN NO EVENT SHALL CABLETRON SYSTEMS BE LIABLE FOR ANY INCIDENTAL,

INDIRECT, SPECIAL, OR CONSEQUENTIAL DAMAGES WHATSOEVER (INCLUDING BUT

NOT LIMITED TO LOST PROFITS) ARISING OUT OF OR RELATED TO THIS MANUAL OR

THE INFORMATION CONTAINED IN IT, EVEN IF CABLETRON SYSTEMS HAS BEEN

ADVISED OF, KNOWN, OR SHOULD HAVE KNOWN, THE POSSIBILITY OF SUCH

DAMAGES.



Printed in the United States of America

Order Number: 9030494-01 January 1996

SPECTRUM

,

LANVIEW

,

MicroMMAC

, and

BRIM

are registered trademarks and

Element

Manager

,

EPIM

,

EPIM-A

,

EPIM-F1

,

EPIM-F2

,

EPIM-F3

,

EPIM-T

,

EPIM-X

,

FOT-F

,

FOT-F3

,

HubSTACK

,

IRM3,

SEH

,

SEHI

, and

TMS-3

are trademarks of Cabletron Systems, Inc.

All other product names mentioned in this manual may be trademarks or registered trademarks of

their respective companies.

Printed on Recycled Paper

Notice

ii IRM3 User’s Guide

FCC NOTICE

This device complies with Part 15 of the FCC rules. Operation is subject to the following two

conditions: (1) this device may not cause harmful interference, and (2) this device must accept any

interference received, including interference that may cause undesired operation.

NOTE:

This equipment has been tested and found to comply with the limits for a Class A digital

device, pursuant to Part 15 of the FCC rules. These limits are designed to provide reasonable

protection against harmful interference when the equipment is operated in a commercial environment.

This equipment uses, generates, and can radiate radio frequency energy and if not installed in

accordance with the operator’s manual, may cause harmful interference to radio communications.

Operation of this equipment in a residential area is likely to cause interference in which case the user

will be required to correct the interference at his own expense.

WARNING:

Changes or modifications made to this device which are not expressly approved by the

party responsible for compliance could void the user’s authority to operate the equipment.

DOC NOTICE

This digital apparatus does not exceed the Class A limits for radio noise emissions from digital

apparatus set out in the Radio Interference Regulations of the Canadian Department of

Communications.

Le présent appareil numérique n’émet pas de bruits radioélectriques dépassant les limites applicables

aux appareils numériques de la class A prescrites dans le Règlement sur le brouillage radioélectrique

édicté par le ministère des Communications du Canada.

VCCI NOTICE

This equipment is in the 1st Class Category (information equipment to be used in commercial and/or

industrial areas) and conforms to the standards set by the Voluntary Control Council for Interference

by Information Technology Equipment (VCCI) aimed at preventing radio interference in commercial

and/or industrial areas.

Consequently, when used in a residential area or in an adjacent area thereto, radio interference may be

caused to radios and TV receivers, etc.

Read the instructions for correct handling.

Notice

IRM3 User’s Guide iii

CABLETRON SYSTEMS, INC. PROGRAM LICENSE AGREEMENT

IMPORTANT:

Before utilizing this product, carefully read this License Agreement.

This document is an agreement between you, the end user, and Cabletron Systems, Inc. (“Cabletron”)

that sets forth your rights and obligations with respect to the Cabletron software program (the

“Program”) contained in this package. The Program may be contained in ﬁrmware, chips or other

media. BY UTILIZING THE ENCLOSED PRODUCT, YOU ARE AGREEING TO BECOME

BOUND BY THE TERMS OF THIS AGREEMENT, WHICH INCLUDES THE LICENSE AND

THE LIMITATION OF WARRANTY AND DISCLAIMER OF LIABILITY. IF YOU DO NOT

AGREE TO THE TERMS OF THIS AGREEMENT, PROMPTLY RETURN THE UNUSED

PRODUCT TO THE PLACE OF PURCHASE FOR A FULL REFUND.

CABLETRON SOFTWARE PROGRAM LICENSE

1. LICENSE

. You have the right to use only the one (1) copy of the Program provided in this

package subject to the terms and conditions of this License Agreement.

You may not copy, reproduce or transmit any part of the Program except as permitted by the

Copyright Act of the United States or as authorized in writing by Cabletron.

2. OTHER RESTRICTIONS. You may not reverse engineer, decompile, or disassemble the

Program.

3. APPLICABLE LAW. This License Agreement shall be interpreted and governed under the laws

and in the state and federal courts of New Hampshire. You accept the personal jurisdiction and

venue of the New Hampshire courts.

EXCLUSION OF WARRANTY AND DISCLAIMER OF LIABILITY

1. EXCLUSION OF

WARRANTY. Except as may be specifically provided by Cabletron in

writing, Cabletron makes no warranty, expressed or implied, concerning the Program (including

its documentation and media).

CABLETRON DISCLAIMS ALL WARRANTIES, OTHER THAN THOSE SUPPLIED TO

YOU BY CABLETRON IN WRITING, EITHER EXPRESSED OR IMPLIED, INCLUDING

BUT NOT LIMITED TO IMPLIED WARRANTIES OF MERCHANTABILITY AND

FITNESS FOR A PARTICULAR PURPOSE, WITH RESPECT TO THE PROGRAM, THE

ACCOMPANYING WRITTEN MATERIALS, AND ANY ACCOMPANYING HARDWARE.

2. NO LIABILITY FOR CONSEQUENTIAL DAMAGES. IN NO EVENT SHALL

CABLETRON OR ITS SUPPLIERS BE LIABLE FOR ANY DAMAGES WHATSOEVER

(INCLUDING, WITHOUT LIMITATION, DAMAGES FOR LOSS OF BUSINESS,

PROFITS, BUSINESS INTERRUPTION, LOSS OF BUSINESS INFORMATION, SPECIAL,

INCIDENTAL, CONSEQUENTIAL, OR RELIANCE DAMAGES, OR OTHER LOSS)

ARISING OUT OF THE USE OR INABILITY TO USE THIS CABLETRON PRODUCT,

EVEN IF CABLETRON HAS BEEN ADVISED OF THE POSSIBILITY OF SUCH

DAMAGES. BECAUSE SOME STATES DO NOT ALLOW THE EXCLUSION OR

LIMITATION OF LIABILITY FOR CONSEQUENTIAL OR INCIDENTAL DAMAGES, OR

ON THE DURATION OR LIMITATION OF IMPLIED WARRANTIES, IN SOME

INSTANCES THE ABOVE LIMITATIONS AND EXCLUSIONS MAY NOT APPLY TO

YOU.

Notice

iv IRM3 User’s Guide

UNITED STATES GOVERNMENT RESTRICTED RIGHTS

The enclosed product (a) was developed solely at private expense; (b) contains “restricted computer

software” submitted with restricted rights in accordance with Section 52227-19 (a) through (d) of the

Commercial Computer Software - Restricted Rights Clause and its successors, and (c) in all respects

is proprietary data belonging to Cabletron and/or its suppliers.

For Department of Defense units, the product is licensed with “Restricted Rights” as deﬁned in the

DoD Supplement to the Federal Acquisition Regulations, Section 52.227-7013 (c) (1) (ii) and its

successors, and use, duplication, disclosure by the Government is subject to restrictions as set forth in

subparagraph (c) (1) (ii) of the Rights in Technical Data and Computer Software clause at 252.227-

7013. Cabletron Systems, Inc., 35 Industrial Way, Rochester, New Hampshire 03867-0505.

IRM3 User’s Guide v

CONTENTS

CHAPTER 1 INTRODUCTION

1.1 Using This Manual.......................................................................1-1

1.2 The Intelligent Repeater Module (IRM3) .....................................1-2

1.3 IRM3 Front Panel ........................................................................1-4

1.3.1 IRM3 Features................................................................1-5

1.4 Repeater Functionality.................................................................1-5

1.5 Network Management Capabilities..............................................1-6

1.6 Getting Help.................................................................................1-7

1.7 Document Conventions...............................................................1-8

1.8 Related Manuals..........................................................................1-9

CHAPTER 2 NETWORK PLANNING AND CONFIGURATION

2.1 Network Requirements................................................................2-1

2.1.1 802.3 Repeater Requirements........................................2-1

2.1.2 AUI Port Requirements...................................................2-1

2.1.3 Fiber Optic Port Requirements .......................................2-2

2.2 The IRM3 in the Multi Media Access Center...............................2-3

2.2.1 Media Interface Modules ................................................2-4

2.3 Sample Network Configuration....................................................2-5

CHAPTER 3 INSTALLING THE IRM3

3.1 Unpacking the IRM3....................................................................3-1

3.2 Setting the IRM3 Jumpers...........................................................3-2

3.2.1 Setting the Battery Enable/Disable Jumper (H1)............3-2

3.2.2 Setting the CTS External/Internal Jumper (H6, H8)........3-3

3.2.3 Setting the THN-MIM Jumper (JP1)................................3-4

3.3 Installing the IRM3 into an MMAC Chassis.................................3-4

3.4 Pre-installation Test.....................................................................3-7

3.5 Connecting the IRM3 to the Network...........................................3-8

3.5.1 Connecting to the Network Through the AUI Port ..........3-9

3.5.2 Connecting to the Network Through the

Fiber Optic Port3-10

3.6 Installation Checkout.................................................................3-12

3.7 Connecting to the UPS Through the Console Port....................3-13

Contents

vi IRM3 User’s Guide

CHAPTER 4 LOCAL MANAGEMENT

4.1 Accessing Local Management Using a Terminal.........................4-3

4.1.1 Configuring a Local Management Terminal ....................4-3

4.1.2 Terminal Attachment Cable Configuration ......................4-4

4.1.3 Connecting the Terminal and Accessing Local

Management4-5

4.2 Accessing Local Management Using a Modem...........................4-7

4.2.1 Modem Configurations....................................................4-7

4.2.2 Modem Attachment Cable Configuration ........................4-7

4.2.3 Connecting the Modem and Accessing Management.....4-8

4.3 The Password Screen..................................................................4-9

4.4 The Device/Board/Port Counters Screen...................................4-10

4.4.1 Configuring the Device/Board/Port Counters Screen....4-11

4.4.2 Device/Board/Port/Counters Screen Fields...................4-12

4.4.3 Resetting the Device/Board/Port Counters ...................4-13

4.4.4 Using the Enable Board/Disable Board Options ...........4-14

4.4.5 Using the Enable Port/Disable Port Option...................4-14

4.4.6 Available Options from the Device/Board/Port Counters

Screen4-14

4.5 Community Names Screen........................................................4-15

4.5.1 Accessing the Community Names Screen....................4-16

4.5.2 Community Names Screen Fields.................................4-16

4.5.3 Editing the Community Names Screen .........................4-17

4.6 The Setup Screen......................................................................4-18

4.6.1 Accessing the Setup Screen.........................................4-19

4.6.2 Setup Screen Fields......................................................4-19

4.6.3 Setting the Set IP Address Option.................................4-20

4.6.4 Setting the Set Current Date Option..............................4-21

4.6.5 Setting the Set Current Time Option.............................4-21

4.6.6 Setting the Device Lock Option.....................................4-21

4.6.7 Setting the Set Refresh Time Option.............................4-22

4.7 Port Association Screen.............................................................4-22

4.7.1 Accessing the Port Association Option .........................4-22

4.7.2 Port Association Screen Fields .....................................4-23

4.7.3 Changing the Port Association......................................4-24

4.8 The Token Ring Board Status Screen.......................................4-24

4.8.1 Accessing the Token Ring Board Status Screen ..........4-25

4.8.2 Token Ring Board Status Screen Fields.......................4-26

4.8.3 Editing the Token Ring Board Status Screen................4-29

Contents

IRM3 User’s Guide vii

CHAPTER 5 TROUBLESHOOTING

5.1 Using LANVIEW..........................................................................5-1

5.2 Troubleshooting Checklist...........................................................5-4

5.3 Using the Reset Switch ...............................................................5-5

5.4 Before Calling Technical Support................................................5-5

APPENDIX A SPECIFICATIONS

A.1 Repeater Functionality.................................................................A-1

A.2 AUI Port.......................................................................................A-2

A.3 Fiber Optic Interface....................................................................A-2

A.4 Console Port................................................................................A-3

A.5 Microprocessors and Memory.....................................................A-3

A.6 Environmental Requirements......................................................A-3

A.7 Agency Approvals........................................................................A-4

A.8 Service.........................................................................................A-4

A.9 Physical Properties......................................................................A-4

INDEX

IRM3 User’s Guide Page 1-1

CHAPTER 1

INTRODUCTION

Welcome to the Cabletron Systems

Intelligent Repeater Module

(IRM3) User’s Guide

. This manual serves as an installation,

management, and reference guide for the IRM3, and includes a

description of the IRM3 capabilities and special features. The IRM3

provides a high performance IEEE 802.3 repeater with sophisticated

network management capabilities for use in a Cabletron Systems Multi

Media Access Center (MMAC).

1.1 USING THIS MANUAL

Before installing and operating the IRM3, read through this guide to gain

a full understanding of its capabilities.

It is assumed that you have a general working knowledge of Ethernet or

IEEE 802.3 type data communications networks and their physical layer

components.

This guide is organized as follows:

Chapter 1,

Introduction

, describes the capabilities of the IRM3,

including an explanation of the IRM3 repeater functionality and its

management capabilities. This chapter concludes with instructions on

how to get help if needed and a list of related manuals.

Chapter 2,

Network Planning and Configuration

, provides

conﬁguration requirements to consider before installing the IRM3. This

chapter also includes a sample conﬁguration for the IRM3.

Chapter 3,

Installing the IRM3

, contains instructions for installing the

IRM3 into an MMAC. This chapter also includes instructions for

connecting the IRM3 to the network.

Chapter 1:

Introduction

Page 1-2 IRM3 User’s Guide

Chapter 4,

Local Management

, describes Local Management (LM) and

control capabilities for the IRM3. Local Management provides the tools

to manage the IRM3 and its attached segments.

Chapter 5,

Troubleshooting

,

details the LANVIEW LEDs incorporated

into the IRM3, which enable you to quickly diagnose any problems that

may occur with the IRM3. This chapter also includes a troubleshooting

checklist, procedures for using the reset switch and instructions for

calling technical support.

Appendix A,

Specifications

, contains location requirements and

operating speciﬁcations for the IRM3.

1.2 THE INTELLIGENT REPEATER MODULE (IRM3)

The Intelligent Repeater Module (IRM3) (Figure 1-1) is the heart of the

Cabletron Systems Multi Media Access Center (MMAC). The IRM3

incorporates a high performance IEEE 802.3 repeater to allow maximum

data paths between devices connected to the MMAC.

The IRM3 is Simple Network Management Protocol (SNMP) compliant,

and can be controlled and monitored by a variety of SNMP Network

Management packages. These include Cabletron Systems SPECTRUM

Element Manager for Windows, Cabletron Systems SPECTRUM, and

third party SNMP network management packages. Additionally, the

IRM3 can be controlled and monitored by IRM3/LM - Local

Management for the IRM3 through a terminal connected locally or

through a Hayes compatible modem.

The Intelligent Repeater Module (IRM3)

IRM3 User’s Guide Page 1-3

.

Figure 1-1 Intelligent Repeater Module (IRM3)

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MGMT

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Chapter 1:

Introduction

Page 1-4 IRM3 User’s Guide

1.3 IRM3 FRONT PANEL

The IRM3 incorporates two ports that connect to external network

segments:

• One pair of IEEE 802.3 FOIRL ﬁber optic ports. The ﬁber optic ST

port accommodates a wide variety of multimode ﬁber optic cable,

including 50/125

µ

m, 62.5/125

µ

m, and 100/140

µ

m ﬁber optic cable,

up to 2 km in length.

• An IEEE 802.3 compliant AUI port. The AUI port allows you to

connect the module to a variety of Ethernet transmission media

including twisted pair, ﬁber optic, and/or thick or thin Ethernet coaxial

cable by way of an external transceiver.

Either one of these ports can act as the repeater port to the external

network. When the IRM3 is ﬁrst powered up, the AUI port acts as the

repeater port and the ﬁber ports are off. Using the IRM3 network

management capabilities (see Chapter 4,

Local Management

), you can

reverse this conﬁguration to have the ﬁber port act as the repeater port and

have the AUI port off. This conﬁguration allows you to connect the IRM3

to a ﬁber optic link segment directly without having to use an external

ﬁber optic transceiver.

The IRM3 also provides the option, through remote management, to set

one port as the active repeater port and the other port as a redundant

repeater port.

Built into the front panel of the IRM3 are two standard 9-pin RS232

console ports labeled CONSOLE and UPS. The CONSOLE port enables

you to access the IRM3/LM locally or remotely using a Hayes compatible

modem. If you are using a CS-600R/CS-1250R series Uninterruptible

Power Source (UPS), the UPS port enables you to monitor and control the

UPS through the IRM3 using SPECTRUM Element Manager for

Windows or SPECTRUM. The front panel also has a reset switch to

initialize the IRM3 processor.

The IRM3 incorporates the Cabletron Systems LANVIEW Status

Monitoring and Diagnostic System. If a problem arises, such as a power

failure or a cable fault, the LANVIEW LEDs (see Section 5.1,

Using

LANVIEW

) help you to diagnose it.

Repeater Functionality

IRM3 User’s Guide Page 1-5

The LANVIEW LEDs on the IRM3 indicate the following conditions:

• The IRM3 is receiving power

• An error has been detected with the IRM3

• The IRM3 is receiving packets from any segment connected to the

MMAC

• The IRM3 is detecting a collision from the network

1.3.1 IRM3 Features

There are a number of features that provide for efﬁcient use and

maintenance of the IRM3. These features include the following:

• Flash EPROM. This feature enables you to upgrade the IRM3 without

replacing ﬁrmware. Flash EPROMs can be updated remotely by

downloading the new software by way of Cabletron Systems

SPECTRUM Element Manager for Windows.

• Thermal Sensors. These sensors warn the management station if the

IRM3 begins to overheat.

• Ethernet SNMP Proxy. With SNMP proxy, you can use IRM3 remote

management to control power settings for the American Power

Conversion’s uninterruptible power source (UPS).

• Connect the UPS to the IRM3 UPS port to control the power supply

through an SNMP compliant network management tool, such as

Cabletron Systems SPECTRUM Element Manager for Windows and

SPECTRUM.

1.4 REPEATER FUNCTIONALITY

The IEEE 802.3 compliant repeater on the IRM3 provides the MMAC

with the ability to achieve maximum data paths on all Ethernet

transmission media, including 10BASE-T, ﬁber optic, and thick or thin

Ethernet type cabling. To attain maximum data paths, the IRM3 retimes

Chapter 1:

Introduction

Page 1-6 IRM3 User’s Guide

data packets and regenerates the preamble of each data packet that enters

the MMAC.

In addition, IRM3 repeater functionality assures that problem segments

connected to any port on the MMAC do not affect any other segments

connected to the MMAC. If 32 consecutive collisions are detected on any

segment, or if a collision detector is on for more than 2.4 ms, the IRM3

automatically partitions that segment. The segment automatically

reconnects to the MMAC after a packet is transmitted onto the segment

without causing a collision.

1.5 NETWORK MANAGEMENT CAPABILITIES

The Cabletron Systems IRM3 can be controlled and managed by a variety

of network management packages which include the following:

• Cabletron Systems SPECTRUM

• Cabletron Systems SPECTRUM Element Manager for Windows

• Cabletron Systems IRM3/LM (Local Management)

• Third Party SNMP compliant Network Management Packages

The IRM3 network management capabilities provide the necessary

management tools for the IRM3 to operate at its full capacity. Your ability

to set up parameters within the network management capabilities ensures

optimal performance of the IRM3, and, hence, the network.

For example, a great deal of statistical information on the port, board, and

MMAC device level is gathered by the IRM3, including each of the

following:

• Packets • Bytes Received

• Collisions • Giant Packets

• Runt Packets • Misaligned Packets

• Frame Size • Out of Window Collisions

• Breakdowns • CRC Errors

Getting Help

IRM3 User’s Guide Page 1-7

To help you see how your network is being used, and to help you plan for

future network use, the IRM3 also provides Ethernet protocol counters on

the port and board level for the following protocols:

• AppleTalk

• Banyan

• Cabletron

• DECnet

• ISO/OSI

• Novell

• TCP/IP

• XNS

• Other

For further speciﬁc information on in-band management of the IRM3,

refer to the applicable Network Management Package User’s Manual.

1.6 GETTING HELP

If you need additional support related to the IRM3, or if you have any

questions, comments, or suggestions related to this manual, contact

Cabletron Systems Technical Support:

By phone (603) 332-9400

Monday–Friday, 8

A.M –

8

P

.

M

. Eastern time

By CompuServe GO CTRON from any ! prompt

By Internet mail: [email protected]

By FTP ctron.com (134.141.197.25)

Login:

anonymous

Password:

your email address

Chapter 1:

Introduction

Page 1-8 IRM3 User’s Guide

Before calling Cabletron Systems Technical Support, be prepared to

provide the following information:

• A detailed description of the failure.

• A description of any action already taken to resolve the problem

(swapping the bad unit with a unit known to work properly, etc.)

• A description of your network (environment, layout, cable type and

length, etc.)

• Serial numbers of all Cabletron Systems products used in the network.

• Revision level of all Cabletron Systems products in the network

• Revision level of ﬁrmware installed on all Cabletron Systems products

• The network load and frame size at the time of the failure, if known

• Product history (had the product been returned previously, did it have

the same problem, etc.)

• The RMA number generated, if any

1.7 DOCUMENT CONVENTIONS

The following conventions are used throughout this document:

NOTE

symbol. Calls the reader’s attention to any item of

information that may be of special importance.

TIP

symbol. Conveys helpful hints concerning procedures or

actions.

!

CAUTION

symbol. Contains information essential to avoid

damage to the equipment.

WARNING

symbol. Warns against an action that could result in

equipment damage, personal injury or death.

Related Manuals

IRM3 User’s Guide Page 1-9

1.8 RELATED MANUALS

The manuals listed below should be used to supplement the procedures

and other technical data provided in this manual. The procedures will be

referenced where appropriate, but will not be repeated.

Cabletron Systems

Multi Media Access Center Overview and Setup

Guide.

Cabletron Systems

IRM3 Management Module Guide for Microsoft

Windows.

IRM3 User’s Guide Page 2-1

CHAPTER 2

NETWORK PLANNING AND CONFIGURATION

This chapter addresses some of the conﬁguration issues that you should

consider when installing the IRM3, including 802.3 standards related to

repeaters, transceivers, and cables. This chapter also gives an overview of

Cabletron Systems Multi Media Access Center (MMAC) and the Media

Interface Modules (MIM) that can be managed by the IRM3. Finally, an

example of a network conﬁguration using the IRM3 is provided.

2.1 NETWORK REQUIREMENTS

When connecting network segments to the IRM3, you must follow the

network guidelines listed below.

2.1.1 802.3 Repeater Requirements

Depending on the size of your network, you may need to use multiple

repeaters. When planning your network, keep in mind that 802.3

standards allow for no more than four repeaters in one data path. If your

network requires more than four repeaters, use a bridge to create a new

data path.

2.1.2 AUI Port Requirements

The IRM3 provides the ﬂexibility of connecting to a network with

different types of media through the AUI port. Using an AUI cable along

with the proper Cabletron Systems transceiver, you can connect to the

network with AUI cable, coaxial cable, twisted pair cable, or ﬁber optic

cable.

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