Cabletron Systems MicroMMAC-44T User manual

MicroMMAC-22T/24T/42T/44T

USER’S GUIDE

BOOKTITLE2 OPTIONAL

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.



Cabletron Systems, Inc., P.O. Box 5005, Rochester, NH 03866-5005

Printed in the United States of America

Order Number: 9031320-01 May 1997

SPECTRUM

,

Remote

SPECTRUM

,

Remote LANVIEW

, and

MicroMMAC

are registered

trademarks, and

CRBRIM-W/T

,

MicroSNAC-T

,

HubSTACK

,

STH

,

STHI

,

TRC 800

, and

TPIM

are trademarks of Cabletron Systems, Inc.

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

trademarks of their respective companies.

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.

Printed on Recycled Paper

NOTICE

ii

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.

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.

NOTICE

iii

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.

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.

NOTICE

iv

DECLARATION OF CONFORMITY

Application of Council Directive(s):

89/336/EEC

73/23/EEC

Manufacturer’s Name:

Cabletron Systems, Inc.

Manufacturer’s Address:

35 Industrial Way

PO Box 5005

Rochester, NH 03867

European Representative Name:

Mr. J. Solari

European Representative Address:

Cabletron Systems Limited

Nexus House, Newbury Business Park

London Road, Newbury

Berkshire RG13 2PZ, England

Conformance to Directive(s)/Product Standards:

EC Directive 89/336/EEC

EC Directive 73/23/EEC

EN 55022

EN 50082-1

EN 60950

Equipment Type/Environment:

Networking Equipment, for use in a

Commercial or Light

Industrial

Environment.

We the undersigned, hereby declare, under our sole responsibility, that the equipment packaged

with this notice conforms to the above directives.

Manufacturer Legal Representative in Europe

Mr. Ronald Fotino Mr. J. Solari

___________________________________ ___________________________________

Full Name Full Name

Principal Compliance Engineer Managing Director - E.M.E.A.

___________________________________ ___________________________________

Title Title

Rochester, NH, USA Newbury, Berkshire, England

___________________________________ ___________________________________

Location Location

v

CONTENTS

PREFACE

CHAPTER 1 INTRODUCTION

1.1 MicroMMAC-T Models.................................................................1-1

1.2 MicroMMAC-T Features..............................................................1-2

1.2.1 Lobe Port Features.........................................................1-2

1.2.2 Management Capabilities ...............................................1-2

1.2.3 Firmware Downloads To Flash EEPROM.......................1-3

1.2.4 Monitoring And Diagnostic Indicators .............................1-4

1.2.5 Ring Poll Failure Recovery .............................................1-4

1.2.6 Beaconing Protection/Recovery .....................................1-5

1.2.7 Distributed Monitoring Capabilities .................................1-6

1.2.8 UPS Monitoring Capability..............................................1-8

1.2.9 Accessories ....................................................................1-8

1.2.10 Management Information Base (MIB) Groups................1-9

CHAPTER 2 OPERATION

2.1 Turning The Hub On And Off.......................................................2-3

2.2 Control Switches And Buttons.....................................................2-4

2.2.1 Setting The Ring Speed..................................................2-4

2.2.2 Resetting The MicroMMAC-T .........................................2-5

2.2.3 Clearing NVRAM ............................................................2-6

2.3 Indicators.....................................................................................2-7

2.3.1 Describing LANVIEW LEDs............................................2-7

2.3.2 Describing The LCD System ..........................................2-8

2.4 Ports..........................................................................................2-10

2.4.1 COM Ports....................................................................2-10

2.4.2 Lobe Ports ....................................................................2-11

2.4.3 Ring In/Ring Out Ports..................................................2-12

2.4.4 STH STACK Ports ........................................................2-12

CHAPTER 3 INSTALLATION

3.1 Installing The MicroMMAC-T.......................................................3-1

3.1.1 Installation Requirements ...............................................3-1

3.1.2 Attaching The Strain-Relief Bar ......................................3-2

3.1.3 Installing The MicroMMAC-T In A Rack..........................3-3

3.1.4 Free-Standing Installation...............................................3-4

CONTENTS

vi

3.2 Installing Accessories ..................................................................3-5

3.2.1 Removing The Chassis Cover.........................................3-5

3.2.2 Removing Protection Panels...........................................3-6

3.2.3 Connectors And Ports On The Motherboard...................3-8

3.2.4 Installing The 12-Port Daughterboard.............................3-9

3.2.5 Installing The MicroSNAC-T..........................................3-11

3.2.6 Installing The CRBRIM-W/T..........................................3-12

3.2.7 Installing The LDRAM SIMM.........................................3-13

CHAPTER 4 CABLING

4.1 Token Ring Cabling Overview .....................................................4-1

4.1.1 Describing Trunk Cabling................................................4-1

4.1.2 Describing Lobe Cabling.................................................4-2

4.2 Requirements And Recommendations ........................................4-2

4.2.1 Signal Interference..........................................................4-3

4.2.2 Determining The Station Count.......................................4-3

4.2.3 Determining The Maximum Signal-Drive Distance..........4-4

4.3 Connecting Lobe Port Cabling.....................................................4-6

4.4 Connecting Trunk Cabling .........................................................4-10

4.4.1 Describing TPIMs..........................................................4-10

4.4.2 Configuring TPIMs For RI/RO Application.....................4-11

4.4.3 Installing A TPIM...........................................................4-12

4.4.4 Connecting Twisted Pair Trunk Cable Segments..........4-13

4.4.5 Connecting Fiber Optic Trunk Cable Segments............4-15

4.5 Connecting STH Stackable Hubs ..............................................4-17

CHAPTER 5 MONITORING AND TROUBLESHOOTING

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

5.2 Using The LCD System ...............................................................5-2

5.2.1 Viewing Static System Messages ...................................5-2

5.2.2 Viewing Saved Alarm Messages.....................................5-3

5.2.3 Viewing Unsaved Initialization Messages .......................5-6

5.2.4 Viewing Saved System Messages..................................5-7

5.3 Monitoring The Initialization Process ...........................................5-8

5.3.1 Power Up Diagnostic Screen ..........................................5-8

5.3.2 LEDs And The LCD Panel.............................................5-10

5.4 General Troubleshooting Checklist............................................5-11

CONTENTS

vii

APPENDIX A SYSTEM SPECIFICATIONS

A.1 Operating Specifications..............................................................A-1

A.2 Power Supply Specifications.......................................................A-1

A.3 Environmental Specifications ......................................................A-2

A.4 Physical Specifications................................................................A-2

A.5 Safety ..........................................................................................A-2

A.6 EMC Requirements.....................................................................A-2

APPENDIX B TPIM SPECIFICATIONS

B.1 TPIM-T1/T2/T4 Pinouts...............................................................B-1

B.2 TPIM-F2/F3 Specifications..........................................................B-2

APPENDIX C MEDIA SPECIFICATIONS

C.1 Twisted Pair Copper Cable..........................................................C-1

C.1.1 UTP.................................................................................C-1

C.1.2 STP .................................................................................C-2

C.2 Fiber Optic Cable.........................................................................C-3

C.2.1 Multimode........................................................................C-4

C.2.2 Single-Mode....................................................................C-4

INDEX

CONTENTS

viii

ix

FIGURES

Figure 1-1 The MicroMMAC-T . . . . . . . . . . . . . . . . . . . . . . . . . . . .1-1

Figure 2-1 MicroMMAC-T Operational Components . . . . . . . . . . .2-2

Figure 2-2 Connecting To A Power Source. . . . . . . . . . . . . . . . . . .2-3

Figure 2-3 Ring Speed Switch . . . . . . . . . . . . . . . . . . . . . . . . . . . .2-4

Figure 2-4 The RESET Switch . . . . . . . . . . . . . . . . . . . . . . . . . . . .2-5

Figure 2-5 NVRAM Switch . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .2-6

Figure 2-6 LANVIEW LEDs . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .2-7

Figure 2-7 LCD Panel And DISPLAY Button . . . . . . . . . . . . . . . . .2-9

Figure 2-8 COM Ports. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .2-10

Figure 2-9 Lobe Ports. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .2-11

Figure 2-10 Lobe Port Pinouts . . . . . . . . . . . . . . . . . . . . . . . . . . . .2-11

Figure 2-11 Ring Ports . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .2-12

Figure 2-12 STH STACK Ports . . . . . . . . . . . . . . . . . . . . . . . . . . . .2-12

Figure 3-1 Strain-Relief Bar . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .3-2

Figure 3-2 Attaching The Strain-Relief Bar. . . . . . . . . . . . . . . . . . .3-3

Figure 3-3 Remove Front Side Screws. . . . . . . . . . . . . . . . . . . . . .3-3

Figure 3-4 Installing Rack-Mount Brackets. . . . . . . . . . . . . . . . . . .3-3

Figure 3-5 Installing The MicroMMAC-T In A Rack. . . . . . . . . . . . .3-4

Figure 3-6 Free-Standing Installation . . . . . . . . . . . . . . . . . . . . . . .3-4

Figure 3-7 Removing Chassis Cover Screws. . . . . . . . . . . . . . . . .3-5

Figure 3-8 Removing The Chassis Cover. . . . . . . . . . . . . . . . . . . .3-6

Figure 3-9 Removing The Front Panel . . . . . . . . . . . . . . . . . . . . . .3-7

Figure 3-10 Removing The Rear Panel . . . . . . . . . . . . . . . . . . . . . .3-8

Figure 3-11 Connectors And Ports For Accessories . . . . . . . . . . . .3-9

Figure 3-12 Installing The 12-port Daughterboard . . . . . . . . . . . . .3-10

Figure 3-13 Installing The MicroSNAC-T Daughterboard. . . . . . . .3-12

Figure 3-14 Installing The CRBRIM-W/T . . . . . . . . . . . . . . . . . . . .3-13

Figure 3-15 Removing The LDRAM SIMM. . . . . . . . . . . . . . . . . . .3-14

Figure 3-16 Installing The LDRAM SIMM. . . . . . . . . . . . . . . . . . . .3-14

Figure 4-1 Trunk And Lobe Cabling Conﬁguration . . . . . . . . . . . . .4-1

Figure 4-2 UTP Lobe Cabling Example . . . . . . . . . . . . . . . . . . . . .4-7

Figure 4-3 STP Lobe Cabling Example . . . . . . . . . . . . . . . . . . . . .4-8

Figure 4-4 Connecting To A Lobe Port . . . . . . . . . . . . . . . . . . . . . .4-9

Figure 4-5 TPIMs . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .4-10

Figure 4-6 TPIM Conﬁguration Settings . . . . . . . . . . . . . . . . . . . .4-11

Figure 4-7 Installing A TPIM . . . . . . . . . . . . . . . . . . . . . . . . . . . . .4-12

Figure 4-8 Connecting To The TPIM-T1 . . . . . . . . . . . . . . . . . . . .4-13

Figure 4-9 Connecting To The TPIM-T4 . . . . . . . . . . . . . . . . . . . .4-13

FIGURES

x

Figure 4-10 Connecting To The TPIM-T2 . . . . . . . . . . . . . . . . . . . .4-14

Figure 4-11 Connecting To The TPIM-F2/-F3 . . . . . . . . . . . . . . . . .4-16

Figure 4-12 MicroMMAC-T/STH Stack Conﬁguration. . . . . . . . . . .4-17

Figure 5-1 Power Up Diagnostic Screen. . . . . . . . . . . . . . . . . . . . .5-8

Figure B-1 TPIM-T1/T2/T4 Pinouts . . . . . . . . . . . . . . . . . . . . . . . . B-1

xi

TABLES

Table 4-1 Maximum Lobe Cable Lengths . . . . . . . . . . . . . . . . . . .4-5

Table 4-2 Maximum Trunk Cable Lengths. . . . . . . . . . . . . . . . . . .4-5

Table 4-3 Connector Pinout Cross-Reference . . . . . . . . . . . . . . .4-8

Table 4-4 TPIM Models. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .4-10

Table 5-1 LANVIEW LEDs . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .5-1

Table 5-2 Static System Messages. . . . . . . . . . . . . . . . . . . . . . . .5-2

Table 5-3 Alarm Messages . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .5-3

Table 5-4 Unsaved Initialization Messages. . . . . . . . . . . . . . . . . .5-6

Table 5-5 Unsaved Failure Or Error Messages. . . . . . . . . . . . . . .5-6

Table 5-6 Saved System Messages . . . . . . . . . . . . . . . . . . . . . . .5-7

Table 5-7 Power Up Indications From LEDs And The LCD. . . . .5-10

Table A-1 Power Supply Outputs. . . . . . . . . . . . . . . . . . . . . . . . . .A-1

Table B-1 TPIM-F2 Receiver Speciﬁcations . . . . . . . . . . . . . . . . .B-2

Table B-2 TPIM-F2 Transmitter Average Power. . . . . . . . . . . . . . .B-2

Table B-3 TPIM-F3 Speciﬁcations. . . . . . . . . . . . . . . . . . . . . . . . .B-3

Table C-1 UTP Performance Speciﬁcations. . . . . . . . . . . . . . . . . .C-2

Table C-2 STP Cable Speciﬁcations . . . . . . . . . . . . . . . . . . . . . . .C-3

Table C-3 Signal Tolerances For Multimode Fiber Optic Cable . . .C-4

Table C-4 Signal Tolerance For Single-Mode Fiber Optic Cable . .C-4

TABLES

xii

xiii

PREFACE

Welcome to the Cabletron Systems

MicroMMAC-22T/24T/42T/44T

User’s Guide

. This guide describes how to install, conﬁgure, and operate

the MicroMMAC-T family of intelligent, stackable Token Ring wiring

hubs. This guide is intended for all users of the MicroMMAC-T, who

should have a basic understanding of the IEEE 802.5 standard for Token

Ring networks, especially of physical components used in Token Ring

networks.

DOCUMENT CONVENTIONS

The following conventions are used throughout this manual:

Bold Italics

are used for references in non-tabular text to Cabletron

Systems publications and other publications.

MicroMMAC-T collectively refers to the MicroMMAC-22T,

MicroMMAC-24T, MicroMMAC-42T, and MicroMMAC-44T in this

manual unless speciﬁed otherwise.

“

uMMAC-T

”

is an abbreviated version of MicroMMAC-T used in select

LCD system messages described in this manual.

NOTE

Note

calls your attention to information of special importance.

!

CAUTION

Caution

calls your attention to information you should heed to

avoid potentially damaging ﬁrmware, conﬁguration settings, or

equipment.

Hazard

calls your attention to potential electric shock hazard.

PREFACE

xiv

USING THIS MANUAL

This manual’s contents is organized as follows:

Chapter 1,

Introduction

, describes MicroMMAC-T model types and

features.

Chapter 2,

Operation

,

describes how to connect the MicroMMAC-T to a

power source, how to work with operational components, and the

functions of MicroMMAC-T ports.

Chapter 3,

Installation

,

describes installation requirements, how to install

the MicroMMAC-T, and how to install accessories.

Chapter 4,

Cabling

, describes cabling guidelines for Token Ring

networks and how to connect network cable to MicroMMAC-T lobe, ring,

and stack ports.

Chapter 5,

Monitoring and Troubleshooting

, describes how to use the

system-message LCD, LANVIEW LEDs, and the Power Up Diagnostic

screen to monitor the operational status of the MicroMMAC-T and the

Token Ring network.

Appendix A,

System Speciﬁcations

, lists various system and safety

speciﬁcations.

Appendix B,

TPIM Speciﬁcations

, provides physical and operational

speciﬁcations for Token Ring Port Interface Modules (TPIMs).

Appendix C,

Media Speciﬁcations

, describes design and performance

speciﬁcations for the cable types used with the MicroMMAC-T.

PREFACE

xv

RELATED DOCUMENTATION

This section lists installation and operation manuals included with the

MicroMMAC-T and STH hubs and accessories typically used with the

MicroMMAC-T. Refer to documentation listed for the device you are

working with for speciﬁc information about installing, operating, or

managing the device.

The following publications provide information about Local Area

Networks (LAN) and their implementation.

Local Area Networks, IEEE Standard 802.5 Token Ring Access

Method, And Physical Layer Speciﬁcations

Commercial Building Wiring Standard

, EIA/TIA-568A Standard

Device Installation/Operation Management

MicroMMAC-T

MicroMMAC-22T/24T/42T/44T

User’s Guide

Console Cable Kit Instruction

Sheet

MicroMMAC-T

Unpacking/Parts Sheet

MicroMMAC-T Local

Management Guide

STH-22/24/42/44 STH-22/24/42/44 User’s Guide

MicroMMAC-T Local

Management Guide

CRBRIM-W/T CRBRIM-W/T User’s Guide

CRM-DOC (multi-volume

set)

MicroSNAC-T

MicroSNAC User’s Guide

MicroSNAC Advanced Topics User’s Guide

LDRAM SIMM

Upgrade Kit

SIMM Installation Instruction

Sheet

Not Applicable

PREFACE

xvi

GETTING HELP

If you need technical assistance with your MicroMMAC-T or have any

questions, comments, or suggestions concerning this manual, contact

Cabletron Systems Technical Support using any of the following

methods:

Before calling Cabletron Systems Technical Support, have the following

information ready:

•

A description of the failure

•

A description of any action(s) already taken to resolve the problem

(e.g., rebooting the unit)

•

A description of your network environment (layout, cable type, etc.)

•

Network load and frame size at the time of trouble (if known)

•

The serial and revision numbers of all Cabletron Systems products in

the network (MicroMMAC-T information listed on its Local

Management Password screen)

•

The device history (i.e., have you returned the device before, is this a

recurring problem?)

•

Any previous Return Material Authorization (RMA) numbers

Phone (603) 332-9400

Monday – Friday; 8

A

.

M

. – 8

P

.

M

. Eastern Time

CompuServe GO CTRON from any ! prompt

Internet mail [email protected]

FTP ctron.com (134.141.197.25)

Login

anonymous

Password

your email address

BBS (603) 335-3358

Modem setting 8N1: 8 data bits, 1 stop bit, No parity

For additional information about Cabletron Systems products and

services, visit our World Wide Web site: http://www.cabletron.com/

1-1

CHAPTER 1

INTRODUCTION

The MicroMMAC-T, shown in Figure 1-1, is an IEEE 802.5-based,

IBM-compatible, SNMP-compliant, intelligent, stackable Multi-Media

Access Center (MMAC). The MicroMMAC-T is a versatile wiring hub

into which you can install a variety of products designed to provide a

range of functions to meet your particular network requirements. It

supports connection to up to four Cabletron Systems non-intelligent,

active STH hubs, allowing you to constitute one or more Token Ring

networks from a stack conﬁguration.

Figure 1-1 The MicroMMAC-T

1.1 MicroMMAC-T MODELS

All MicroMMAC-Ts are functionally and physically identical except for

the number and type of their lobe, or Trunk Connection Unit (TCU),

ports. MicroMMAC-T models are listed as follows:

•

MicroMMAC

-

22T

– 12 active RJ45 lobe ports that support category

3, 4, and 5 UTP cabling

•

MicroMMAC

-

24T

– 24 active RJ45 lobe ports that support category

3, 4, and 5 UTP cabling

•

MicroMMAC-42T

– 12 active, shielded RJ45 lobe ports that support

IBM Type 1, 2, 6, and 9 STP cabling

•

MicroMMAC-44T

– 24 active, shielded RJ45 lobe ports that support

IBM Type 1, 2, 6, and 9 STP cabling

R

DISPLAY

RESET

4M 16M

SPEED

CPU

16Mb/s

ACT

MGMT

RO

24 23 22

21 20 19

18 17 16

15 14 13

12 11 10

9 8 7

6 5 4

3 2 1

MicroMMAC-24T

TOKEN RING HUB

WITH

LANVIEW

SUPPORTING 100 OHM UTP CABLE

COM 1

COM 2

RI

24 23 22 21 20 19

18 17 16 15 14 13

12 11 10 9 87 654321

CABLETRON

MicroMMAC-24T

CONSOLE

PORT 2

PORT 1

RST

XMT

RCV

XMT

RCV

MicroSNAC-T

FLT ACT

V35

NMI

Consolidated SNA/SDLC, BSC,

Media-Flexible

Ring Port

Management Access

and UPS Monitoring

RO Convertible

Lobe Ports

(CRBRIM-W/T) Router/WAN Interface

LAN, WAN Connectivity (MicroSNAC)

Connection

LANVIEW LED System

Monitoring and DiagnosticsMo

Message LCD

System-Event

INTRODUCTION

1-2

1.2 MicroMMAC-T FEATURES

This section provides an overview of MicroMMAC-T features.

1.2.1 Lobe Port Features

This section overviews lobe port features.

Repeater Circuitry

Repeater circuitry in the MicroMMAC-T enables lobe ports to regenerate,

reshape, and ﬁlter the incoming signal, permitting UTP lobe cable lengths

of up to 120 meters and STP lobe cable lengths up to 150 meters for a

16 Mbps network.

Speed Fault Protection

The MicroMMAC-T automatically disables any lobe port that detects a

station connected to it from trying to enter the ring at the wrong

operational speed. This prevents the station from causing a beaconing

condition on the ring. A lobe port’s associated Lobe Port Status LED

blinks red to indicate that the port has detected a speed fault violation and

has been put into the bypassed mode. (See Section 5.1 for information

about monitoring the MicroMMAC-T using LANVIEW LEDs.)

Lobe Port To Ring Port Conversion

Lobe ports can be converted through management to Ring Out (RO)

ports, supporting connection

only

to

passive Multi-Station Access Units

(MSAUs) such as the Cabletron Systems TRC-800 or the IBM 8228.

1.2.2 Management Capabilities

The MicroMMAC-T supports both in-band and out-of-band access to

embedded management applications and MIBs.

Local Management (LM)

LM comprises a set of basic monitoring and conﬁguration applications

you can use to manage up to 120 ports on the combined MicroMMAC-T

and STH stack. You can gain out-of-band access to LM using a VT-series

terminal or a PC running a VT-series emulation program from either a

direct cable connection or remote modem connection to either of the

MicroMMAC-T’s front-panel RS-232C COM ports.

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