Cabletron Systems TRMIM-62A User Manual

TRMIM-62A

TOKEN RING MEDIA INTERFACE MODULE

USER’S GUIDE

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.



Copyright 1996 by Cabletron Systems, Inc,. P.O. Box 5005, Rochester, NH 03866-5005
All Rights Reserved
Printed in the United States of America

Order Number: 9031753-01 October 1996

SPECTRUM, LANVIEW
MMAC-M3FNB, MMAC-M8FNB TRMM, TRMMIM,

Cabletron Systems, Inc.
All other product names mentioned in this manual may be trademarks or registered trademarks of

their respective companies.

, and

FNB

are registered trademarks of Cabletron Systems, Inc.

and

TRMIM-62A

are trademarks of

MMAC

,

Printed on Recycled Paper

i

NOTICE

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:

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:

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

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

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

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.

ii

NOTICE

CABLETRON SYSTEMS, INC. PROGRAM LICENSE AGREEMENT

IMPORTANT:

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.

Before utilizing this product, carefully read this License Agreement.

CABLETRON SOFTWARE PROGRAM LICENSE

1. LICENSE

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 LA W. 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.

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

EXCLUSION OF WARRANTY AND DISCLAIMER OF LIABILITY

1. EXCLUSION OF

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 MA TERIALS, AND ANY A CCOMPANYING HARDW ARE.

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.

WARRANTY. Except as may be specifically provided by Cabletron in

iii

NOTICE

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.

iv

CONTENTS

CHAPTER 1 INTRODUCTION

1.1 Getting Help.................................................................................1-2

1.2 Document Conventions...............................................................1-2

1.3 Using This Manual.......................................................................1-2

1.4 TRMIM-62A Features..................................................................1-3

1.4.1 Active TCU Lobe Ports ...................................................1-3

1.4.2 Jumper-Selectable Ring Speed......................................1-4

1.4.3 Speed-Fault Protection...................................................1-4

1.4.4 Beaconing Protection...................................................... 1-4

1.4.5 TRMIM-62A Management ..............................................1-5

1.4.6 Visual Monitoring With LANVIEW LEDs.........................1-5

1.5 Related Manuals..........................................................................1-5

1.6 Recommended Reading..............................................................1-6

CHAPTER 2 REQUIREMENTS AND SPECIFICATIONS

2.1 Installation Guidelines ................................................................. 2-1

2.2 Management Module Requirements ........................................... 2-2

2.3 Cabling Guidelines ...................................................................... 2-2

2.3.1 Maintaining Port/Cabling Impedance Matching ..............2-2

2.3.2 Recommended Lobe Lengths......................................... 2-2

2.4 Setting The Ring Speed .............................................................. 2-3

2.4.1 Management Configuration Overrides............................2-4

2.5 General Specifications.................................................................2-5

2.5.1 Safety.............................................................................. 2-5

2.5.2 Electromagnetic Compatibility (EMC).............................2-5

2.5.3 Physical ..........................................................................2-5

2.5.4 Environmental.................................................................2-5

v

CONTENTS

CHAPTER 3 INSTALLATION

3.1 Unpacking And Handling The TRMIM-62A..................................3-1

3.2 Installing The TRMIM-62A ...........................................................3-2

3.3 Attaching Stations........................................................................3-4

3.4 Checking The Installation.............................................................3-6

CHAPTER 4 MONITORING AND TROUBLESHOOTING

4.1 Using LANVIEW LEDs.................................................................4-1

4.2 Troubleshooting The Network......................................................4-3

INDEX

vi

CHAPTER 1

INTRODUCTION

Welcome to the

User’s Guide

TRMIM-62A Token Ring Media Interface Module

. This manual describes how to configure, install, and attach
stations to the TRMIM-62A. It also describes how to monitor the
operational status of the module and how to troubleshoot any operational
or installation problems that may arise.

The TRMIM-62A (see Figure 1-1), is an IEEE 802.5 compliant Token
Ring Media Interface Module (MIM) providing 12 coaxial lobe
connection ports. It is designed for installation into Cabletron Systems
series of Multi Media Access Centers (MMACs).

TRMIM-62A

SN

16Mb

P

L

E

N

N

K
1
2
3
4
5
6
7
8
9

10
11
12

ERR
MGMT

1

2

3

4

5

6

7

8

9

10

11

J

TOKEN RING

ING

COAXIAL

12

Figure 1-1 The TRMIM-62A

1-1

INTRODUCTION

1.1 GETTING HELP

If you need technical assistance with the TRMIM-62A, or if you have an y
questions, comments, or suggestions concerning this manual, contact
Cabletron Systems Technical Support:

By phone [phone]

A.M

Monday-Friday; 8

. – 8 P.M. Eastern Time
By CompuServe GO CTRON from any ! prompt
By Internet mail [e-mail]
By FTP ctron.com or 134.141.197.25

Login
Password

anonymous
your email address

1.2 DOCUMENT CONVENTIONS

The following conventions are used throughout this document:

Calls the reader’s attention to information that may be of

NOTE

CAUTION

!

special importance

Contains information essential to avoid damage to the
equipment

Warns against any action that could result in equipment
damage or personal injury

1.3 USING THIS MANUAL

Prior to installing and operating the TRMIM-62A, read through this
manual to familiarize yourself with the features of the TRMIM-62A. You
should have a general working knowledge of the IEEE 802.5 standard for
Token Ring networks before installing and operating the TRMIM-62A or
attempting to troubleshoot any installation/network problems you may
encounter.

1-2

This manual is organized as follows:

INTRODUCTION

Chapter 1,

Introduction

, describes how to get technical assistance,
document conventions, the manual’s organizational structure, and
TRMIM-62A features and capabilities. It also lists related manuals and
reference sources.

Chapter 2,

Requirement and Specifications

, provides installation and
cabling guidelines for ensuring optimal performance from the installation.
It also describes how to configure the TRMIM-62A ring speed and lists
safety, physical, and environmental specifications.

Chapter 3,

Installation

, describes guidelines and procedures for
unpacking and handling, configuring, and installing the TRMIM-62A and
for connecting stations to the TRMIM-62A.

Chapter 4,

Monitoring and Troubleshooting

, describes how to use
LANVIEW LEDs, Cabletron Systems front-panel diagnostic and status
monitoring system. It also describes troubleshooting procedures used to
help resolve network installation problems.

1.4 TRMIM-62A FEATURES

This section describes TRMIM-62A features and capabilities.

1.4.1 Active TCU Lobe Ports

The TRMIM-62A’s twelve 93-ohm BNC Trunk Connection Unit (TCU),
or lobe, ports feature active circuitry that regenerates and reshapes
incoming token passing signals. All ports employ the Differential
Manchester Encoding signal technique and support connection to RG 62
93-ohm coaxial cable.

The TRMIM-62A lobe ports support network station

NOTE

attachments only. Ports
Ring In/Ring Out applications.

cannot

be configured to support

1-3

INTRODUCTION

1.4.2 Jumper-Selectable Ring Speed

The TRMIM-62A has a ring speed jumper located on the component
board for configuring the ring operating speed. Section 2.4 provides
instructions for setting the ring speed and information about conditions
under which the network’s default ring speed setting, specified on the
management module in the MMAC, may override the setting you
establish for the TRMIM-62A with the ring speed jumper.

1.4.3 Speed-Fault Protection

The TRMIM-62A has a speed-fault protection circuitry that prevents the
ring from beaconing in the event that a station configured to run at an
operating speed different than the TRMIM-62A’s operating speed is
connected to a TRMIM-62A lobe port. It prevents beaconing by
automatically disabling the port detecting the speed-fault violation. The
port’s corresponding LED indicates the port bypassed, and the station is
denied access to the ring. See Chapter 4 for more information about
LEDs.

Check the 16Mb LED on the front panel of the TRMIM-62A to

NOTE

determine the TRMIM-62A ring operating speed. To avoid
speed fault errors, ensure that the station inserting into the ring
is running at the same ring speed as the ring.

1.4.4 Beaconing Protection

Protection against debilitating beaconing conditions is provided by the
Cabletron Systems Automatic Beacon Recovery Process (ABRP)
algorithm, included with the operating code of the management modules
installed in the MMAC with the TRMIM-62A. ABRP employs
multi-faceted recovery procedures in the event that a beaconing condition
originating at or from the TRMIM-62A or other components constituting
the network is detected by the management module. ABRP ensures that
defective netw ork segments are swiftly isolated from operational netw ork
segments.

1-4

INTRODUCTION

1.4.5 TRMIM-62A Management

A variety of network management tools can be used to manage and
monitor the TRMIM-62A. Cabletron Systems Local Management is the
COM-port accessible management application embedded in all Cabletron
Token Ring Management Modules. Other tools include the family of
Cabletron Systems SPECTRUM remote-management applications.

1.4.6 Visual Monitoring With LANVIEW LEDs

LANVIEW LEDs (Light Emitting Diodes) located on the front panel of
the module provide a visual monitoring and diagnostic system for the
TRMIM-62A.They indicate the ring speed, the presence of a hardware
error, the management status of the module, and the operational status of
lobe ports. See Chapter 4 for a complete description of LED functions.

1.5 RELATED MANUALS

This section lists Cabletron Systems manuals shipped with products
typically used in conjunction with the TRMIM-62A. They provide
necessary technical information about their products’ interoperability
with the TRMIM-62A and other Token Ring devices.

MultiMedia Access Center Overview and Set Up Guide

about setting up an MMAC)

TRMM/TRMMIM Installation Guide

(information about configuring

and installing the Token Ring management modules)

TRMM/TRMMIM Local Management User’s Guide

monitoring and managing the Token Ring network)

TRBMIM-T Installation Guide

(information about configuring and

installing the Token Ring management module)

TRBMIM/TRBMIM-T Local Management User’s Guide

about monitoring and managing the Token Ring network)

(information

(information about

(information

TRMM-2 User’s Guide

about configuring and installing the Token Ring multi-channel
management modules)

TRMM-2 Local Management User’s Guide
Management User’s Guide

the Token Ring network)

and the

TRMM-4 User’s Guide

and the

TRMM-4 Local

(information

(information about monitoring and managing

1-5

INTRODUCTION

1.6 RECOMMENDED READING

The following publications provide information useful for designing and
implementing Token Ring networks.

Local Area Networks, IEEE Standard 802.5 Token Ring Access Method
And Physical Layer Specifications

Commercial Building Wiring Standard, TIA/EIA-568A Standard

1-6

CHAPTER 2

REQUIREMENTS AND SPECIFICATIONS

Before you install the TRMIM-62A, review the installation requirements
and operating specifications outlined in this chapter. Failure to follow
these guidelines when installing the TRMIM-62A could result in poor
network performance.

2.1 INSTALLATION GUIDELINES

Observe the following guidelines when installing the TRMIM-62A:

• The MMAC must be configured with an FNB, (either an

MMAC-3FNB, MMAC-5FNB, MMAC-8FNB or an
MMAC-M3FNB, MMA C-M5FNB, MMAC-M8FNB). A Token Ring
network cannot be established in an MMAC without an FNB
backplane.

• The TRMIM-62A can only be installed into any slot on the

MMAC-M5FNB/M8FNB or MMAC-5FNB/8FNB except the
right-most management slot. It can only be installed into any slot on
the MMAC-M3FNB or MMAC-3FNB except the bottom
management slot.

The FNB is a full-height, full-width backplane that links

NOTE

Cabletron Systems Token Ring products in the MMAC.
MMAC-3s, MMAC-5s, and MMAC-8s without an FNB can be
upgraded with an FNB, providing greater flexibility in
configuring your system. Contact your Cabletron Systems
representative for more information.

• Ensure that the MMAC hub into which you will be installing the

TRMIM-62A has the recommended number and type of power supply
modules. Refer to the documentation included with each MMAC
model for information about power supply requirements.

2-1

REQUIREMENTS AND SPECIFICATIONS

2.2 MANAGEMENT MODULE REQUIREMENTS

This section lists Token Ring management modules with their firmware
versions required for interoperability with the TRMIM-62A:

Management Module Firmware Version

TRMM/TRMMIM 3.01.01 or greater
TRMM-2/TRMM-4 01.02.01 or greater
TRBMIM/TRBMIM-T 2.03.01 or greater

2.3 CABLING GUIDELINES

Take care in planning and preparing the cabling and connections for the
network. The quality of the connections, the length of cables, and other
conditions of the installation are critical factors in determining the
reliability of the network. Work area wall plates/outlets used for the
network should be clearly labeled as supporting Token Ring network lobe
connections.

2.3.1 Maintaining Port/Cabling Impedance Matching

Impedance matching between TRMIM-62A lobe ports and lobe cable is
an important factor in maintaining optimal performance from the network
installation. Basically, impedance is the total resistance, measured in
ohms, that a circuit offers to electrical data signals. Impedance
mismatches between the coaxial lobe cables carrying Token Ring signal
traffic and the lobe ports to which they are connected precipitate e xcessiv e
crosstalk, caused by reflecting waves in the transmission lines.

To avoid degradation of the quality of Token Ring signal transmission in
the network, use only RG 62 93-ohm cable for all lobe port connections to
the TRMIM-62A.

2.3.2 Recommended Lobe Lengths

The length of the cable connecting a station to the trunk coupling unit
(TCU) port on a network module is referred to as the lobe length.
Table 2-1 specifies the recommended maximum lobe lengths per ring
speeds of 4 and 16 Mbps for the TRMIM-62A.

2-2

REQUIREMENTS AND SPECIFICATIONS

Table 2-1 Recommended Lobe Lengths

Lobe Cable Type

RG 62 Coaxial (Used Exclusively)

4 Mbps 16 Mbps

300 meters 100 meters
(1000 feet) (330 feet)

Maximum Lobe Length

The recommended lobe lengths in Table 2-1 may be exceeded

NOTE

in an optimally designed coaxial terminal network, using RG 62
coaxial throughout and having a minimum number of BNC
connector splices on long lobe length cables.

2.4 SETTING THE RING SPEED

The default ring speed setting for the TRMIM-62A is 16 Mbps. To set the
ring operating speed (4 or 16 Mbps), position the JP1 jumper on the
setting you want, as shown in Figure 2-1. See Section 2.4.1 for
information about how, under certain circumstances, a
management-module ring speed setting may override a different ring
speed you specify with the JP1 jumper for the TRMIM-62A.

4Mb

JP1

16Mb

NOTE: The pins are not

numbered on the component board.

Figure 2-1 Ring Speed Settings

4Mb

1

2

3

For a 4Mb setting: slide the jumper over pins 1 & 2.
For a 16Mb setting: slide the jumper over pins 2 & 3.

1

2

3

16Mb

2-3

REQUIREMENTS AND SPECIFICATIONS

2.4.1 Management Configuration Overrides

A Token Ring management module in the MMAC “remembers” the
position and ring speed setting for each Token Ring module in the hub
that it controls. The default response by any Token Ring management
module to a TRMIM-62A configured to run at a ring speed incompatible
for the slot in which the board is initially installed is to bypass it from the
ring. Under certain circumstances, some management modules will
override a different JP1 ring speed setting for the TRMIM-62A. Other
management modules, however, bypass the TRMIM-62A every time it is
installed or reinstalled in the MMAC with a ring speed incompatible with
the slot’s original configuration.

In either a

TRMM-

or a

TRMMIM-managed

ring, the
management-specified ring speed overrides the JP1 ring speed setting on
a TRMIM-62A under the following conditions:

• A TRMIM-62A is remov ed from the MMAC and then reinserted into

its original slot with a different JP1 ring speed setting.
For example, the TRMIM-62A JP1 jumper is changed from the 16

Mbps setting, which is stored in the management module’s memory
when the MIM is originally installed, to a 4 Mbps setting. When it is
reinserted in the MMAC, the 16 Mbps ring speed setting prevails over
the 4 Mbps setting. The TRMIM-62A continues to run at 16 Mbps,
even though its JP1 ring speed jumper is now set at 4 Mbps.

• A replacement TRMIM-62A with a ring speed setting different from

the original MIM is installed in the same slot.

To nullify the management override and establish an isolated ring
supported by the TRMIM-62A running at a different ring speed in the
MMAC, you can try any of the following procedures:

• Reinsert the TRMIM-62A in a slot other than its original slot after you

have changed the JP1 setting.

• Use Local Management for the TRMM or TRMMIM to temporarily

put the TRMIM-62A in “Auto” mode before switching back to the
“Management” mode after you have changed the JP1 setting and
reinserted the TRMIM-62A back into its original slot.

• Temporarily insert a different type of MIM in the TRMIM-62A slot

before reinserting the TRMIM-62A after you have changed the JP1
setting.

2-4

REQUIREMENTS AND SPECIFICATIONS

See the

TRMM/TRMMIM Local Management User’s Guide

for more
information about operational modes and other network-configuration
applications.

Network-configuration settings specified by the management

NOTE

If the ring is managed by either a

TRBMIM-T

module are stored in the management module’s Non-Volatile
Random Access Memory (NVRAM). F or inf ormation about how
to clear NVRAM, see the user’s guide included with the
management module.

TRMM-2

, a

TRMM-4,

or a

management board, a TRMIM-62A with a different JP1
ring speed setting retains its setting and is bypassed from the ring under
all circumstances.

2.5 GENERAL SPECIFICATIONS

This section provides safety and physical specifications.

2.5.1 Safety

This product meets the requirements of UL1950, CSA C22.2 No. 950,
EN60950, IEC950, and 73/23/EEC.

2.5.2 Electromagnetic Compatibility (EMC)

This product meets the emission limits of FCC Part 15, Class A, EN55022
Class A, and VCCI Class I. This product meets the immunity
requirements of EN50082-1

2.5.3 Physical

Dimensions 13.4D x 11.5H x 2.0W inches

(34.0D x 29.2H x 5.1W centimeters)

Weight Under 4 pounds

(1.82 kilograms)

2.5.4 Environmental

Operating Temperature 5° to 40° C
Storage Temperature -30° to 90° C
Relative Humidity 5% to 95% non-condensing

2-5

REQUIREMENTS AND SPECIFICATIONS

2-6

CHAPTER 3

INSTALLATION

This chapter describes how to unpack, handle, and install the
TRMIM-62A. It also describes how to attach Token Ring stations to the
TRMIM-62A.

3.1 UNPACKING AND HANDLING THE TRMIM-62A

Electrostatic Discharge (ESD) can damage the TRMIM-62A. To

!

CAUTION

prevent ESD damage when handling the module: wear the
grounding wriststrap, hold only the edges of the board or the
metal front panel, and avoid touching the components or the
surface of the board.

To unpack the TRMIM-62A:

1. Carefully remove the TRMIM-62A and other items from the shipping

box. Save the box and packaging materials for possible future
repackaging and shipment. You should have the following items:

• TRMIM-62A 12-port Token Ring module

• Disposable grounding wriststrap

• TRMIM-62A User’s Guide

2. Put on the grounding wriststrap. Remove the TRMIM-62A from the

protective bag and place it on top of the bag in a dry, static-free,
dust-free area.

3. Visually inspect the shipment for any signs of damage. Notify

Cabletron Systems Technical Support, as described in Section 1.1 if
you detect any damage or missing parts.

3-1

INSTALLATION

3.2 INSTALLING THE TRMIM-62A

Only authorized personnel should “hot swap” modules in an
activated MMAC. It is recommended that all other personnel
shut down the MMAC before installing or de-installing modules
to eliminate potential damage to the MMAC or the potential
hazard of electrical shock.

Install the TRMIM-62A into the MMAC as described:

1. Put on the anti-static wriststrap included in the shipment and remove
the protective safety panel from any MIM slot in the MMAC.

Ensure that protective safety panels are fastened to MMAC

!

CAUTION

slots not occupied by MIMs.

2. Fully insert the TRMIM-62A into the MMAC by sliding the module
into the top and bottom board slots in the MMAC receptacle (see
Figure 3-1).

When performed correctly, you should be able to feel the management
and FNB interface connectors on the TRMIM-62A insert smoothly
and snugly into their respective connectors on the MMAC backplane.
The front panel of the TRMIM-62A should be flush with the front
panels of other installed MIMs.

Never use more than the minimal amount of physical force

!

CAUTION

necessary to insert the TRMIM-62A into the MMAC. If you feel
any resistance while inserting, STOP. Remove the module and
inspect the slot and the TRMIM-62A for obstructions or
structural irregularities. If you detect damaged components,
call Cabletron Systems Technical Support for assistance.

3. Secure the TRMIM-62A to the MMAC by tightening the knobs on the
TRMIM-62A. Failure to tighten down the knobs may result in a faulty
connection to the MMAC backplane.

TRMIM-62A LEDs light in accordance with the existing network
configuration settings in the MMAC. See Section 4.1 for information
about LEDs.

3-2

MMAC-M3FNB

INSTALLATION

M3FM

J

TOKEN RING

ING

COAXIAL

10

12

11

9

TRMM

7

8

4

5

6

Installation in an MMAC-M3FNB/-3FNB

MMAC-M8FNB

M3PSM

3

2

1

TRMM

J

TRMIM-62A

TRMIM-62A

ING

COAXIAL

TOKEN RING

1

2

3

4

5

6

7

8

9

10

11

12

Installation in an MMAC-M8FNB/-M5FNB or MMAC-8FNB/-5FNB

Figure 3-1 Installing The TRMIM-62A

3-3

INSTALLATION

3.3 ATTACHING STATIONS

Before connecting lobe cables, review the cabling recommendations
described in Section 2.3.

To connect a station to the TRMIM-62A:

1. Attach the Lobe Access Unit (LAU) BNC-to-DB9 male adaptor to the
female DB9 STP port on the station’s network interface card as shown
in Figure 3-2.

LAU Passive Balanced Splitter

RG 62 BNCDB9
Port Port
150 ohm 93 ohm

Token Ring Station

Network Interface Port

LAU

Figure 3-2 Attaching The LAU

3-4

INSTALLATION

2. Insert the BNC connector on the lobe cable into any lobe port on the
TRMIM-62A. Insert the other BNC connector on the lobe cable to the
LAU as shown in Figure 3-3.

3. Repeat these steps for each station.

TRMIM-62A

SN

1

10
11
12

ERR

MGMT

P

L

E

N

N

K

1
2
3
4
5
6
7
8
9

2

3

4

Lobe Port

BNC Connector

Coax Lobe Cable

16Mb

Figure 3-3 Connecting A Station To The TRMIM-62A

BNC Connector

3-5

INSTALLATION

3.4 CHECKING THE INSTALLATION

With power on at the MMAC and the attached stations, check that the red
ERR LED on the TRMIM-62A is not lit, and that no error conditions exist
at the attached stations. The green LNK LEDs should be illuminated for
each station that is inserted into the ring as well as the corresponding
yellow PEN LEDs for ports that are enabled. The yellow 16Mb LED
should be on only if the TRMIM-62A is running at 16 Mbps.

The TRMIM-62A is now ready for operation. Before placing the netw ork
into service, test the installation thoroughly to ensure that all stations can
be addressed and that data is being relayed without error. Verify that the
networking software is configured properly to match the installed
network.

If these conditions do not exist, proceed to Chapter 4 for information
about troubleshooting the installation.

3-6

CHAPTER 4

MONITORING AND TROUBLESHOOTING

This chapter describes how to use LANVIEW LEDs to monitor the
operational status of the network. It also describes troubleshooting
procedures you can use to diagnose and resolve problems with the
TRMIM-62A and the Token Ring installation.

4.1 USING LANVIEW LEDS

LANVIEW is Cabletron Systems front-panel, visual diagnostic and status
monitoring system. You can use the LANVIEW LEDs (see Figure 4-1) to
determine the TRMIM-62A’s operational status, help diagnose network
problems, and pinpoint faulty node segments.

LANVIEW

LEDs

TRMIM-62A

SN

ERR

16Mb

1
2
3
4
5
6
7
8

9
10
11
12

Figure 4-1 LANVIEW LEDs

MGMT

P

L

E

N

N

K

1

2

3

4

4-1

MONITORING AND TROUBLESHOOTING

LEDs are described as follows:

• 16Mb - The Ring Speed LED lights yellow when the TRMIM-62A

ring speed is set to 16 Mbps. When it is not lit, the ring speed is set to
4 Mbps.

• ERR - The Error indicator should not be lit under normal operating

conditions. When solid red, the ERR LED indicates a possible
hardware failure.

If the ERR LED remains red after you have investigated, detected, and
attempted to correct the problem as described in Section 4.2, contact
Cabletron Systems Technical Support.

• MGMT - The Management LED lights green when the

TRMIM-62A’s configuration settings are overridden by the
management module in the MMAC. When it is not lit, the module is
operating under condition of its own default configuration settings.

• PEN - The Port Enabled Status LED lights yellow to indicate the

associated port is enabled by network management. An enabled port
permits insertion of the physically attached ring station into the Token
Ring. When both the PEN and LNK LEDs are lit for the same port, the
station attached to that TCU port is inserted on the ring. When PEN is
not lit, the associated port is disabled and denies insertion of a station
onto the ring.

When PEN is flashing and the LNK LED is lit, the device at that port
is set at the wrong ring speed and the port is bypassed.

• LNK - The Link Status LED lights green to indicate that the station

connected to the port is transmitting phantom current, signaling that it
is trying to insert, or gain access, to the Token Ring. When this LED is
not lit, the associated port is not receiving phantom current, either
because no is station attached to the port or an attached station is not
transmitting phantom current.

4-2

MONITORING AND TROUBLESHOOTING

4.2 T ROUBLESHOOTING THE NETWORK

This section describes troubleshooting procedures you can perform to
diagnose and correct problems with the TRMIM-62A and other MIMs in
the MMAC. The following procedures usually help resolve problems
typically encountered with network installations:

• Check the status of the LEDs on all MIMs in the MMAC. See
Section 4.1 for a complete description of LEDs for the TRMIM-62A
and the user guides for other MIMs in the MMAC for descriptions of
their LEDs.

- Ensure the ERR light on the TRMIM-62 and the equivalent

system-status LED(s) on other MIMs in the MMAC are not lit.
Remove and then reinsert MIMs to help resolve the problem.

- Check the 16Mb LEDs on MIMs to verify the speed settings – all

MIMs composing a common ring must be running at the same ring
speed. MIMs running at a different ring speed are bypassed by
default from the common ring. See Section 2.4 for information
about specifying the ring speed for the TRMIM-62A.

- Verify that LNK and PEN LEDs on the TRMIM-62A and the

equiv alent port-status LED(s) on other MIMs indicate that stations
attached to their corresponding ports are inserted into the ring or
able to insert into the ring.

• Check that MIMs are securely installed in and fastened to the MMA C.
If necessary, correctly reinsert each MIM and then tighten the knobs.

• Be sure that the Token Ring stations and the MMAC are adequately
powered in accordance with their respective power-requirement
specifications and are powered on.

• Trace the ring path through the network to ensure that there are no
physical layer problems. While tracing the ring:

- Check the cable connections at MIMs, patch panels and wall

plates, and Token Ring stations.
Are all connectors inserted fully into or secured to ports?

- Check the installation of the Token Ring network interface cards

in Token Ring stations.
Are the network cards correctly configured and installed?

4-3

MONITORING AND TROUBLESHOOTING

- Check the cable conductors for continuity.

Use cable testers designed for this task.

• Check that MIMs in the MMAC are grouped together according to
their network type if they are not designed for standalone operation
(e. g., Cabletron Systems TPRMIM) along side different network
types. For example:

- Ethernet MIMs must be grouped together.

- Token Ring MIMs must be grouped together. See Section 2.1 for

information about installation guidelines for the TRMIM-62A.

- FDDI MIMs must be grouped together.

• Ensure that the maximum lobe cable lengths specified for the media
types used in the installation and also the maximum number of stations
supported are not exceeded. See Section 2.3.2 for information about
maximum lobe cable lengths for the TRMIM-62A. See equivalent
cabling and station-count guidelines specified in the user guides
included with other MIMs installed in the MMAC.

When these checks have been successfully completed for each connection
and any other necessary corrections have been made, the network should
perform normally. If, however, network problems persist, contact
Cabletron Systems Technical Support, as described in Section 1.1, for
further assistance.

4-4

INDEX

A

Active TCU lobe ports 1-3
Attaching stations 3-4
Automatic Beacon Recovery Process

(ABRP) 1-4

B

Beaconing

speed fault protection from 1-4
Beaconing protection 1-4
BNC connector 2-3, 3-5
BNC port 3-4
BNC-to-DB9 adaptors

connecting to station 3-4

C

Cabling

general guidelines 2-2

port/cabling impedance

matching 2-2
recommended lobe lengths 2-3
requirements for lobe

attachments 2-2

Coaxial lobe cable 3-5
Completing the installation 3-6
Configuration overrides 2-4, 4-2

D

DB9 port 3-4
Differential Manchester

Encoding 1-3

Document

conventions 1-2
structure 1-2

E

Electrostatic discharge 3-1
ERR LED described 4-2
Establishing a network

connection 3-4

G

Grounding wriststrap 3-1

H

Hardware failure

possibility indicated by ERR

LED 4-2

Help, from Cabletron Systems

Technical Support
Department 1-2

I

Impedance rating of cable 2-2
Installation

MMAC requirements 2-1
procedure 3-2
resolving problems with 4-3

K

Knobs on front panel

tightening 3-2

L

LANVIEW LEDs

16Mb 4-2, 4-3
described 4-1
ERR 4-2, 4-3
LNK 4-2
MGMT 4-2

PEN 4-2
LAU passive balanced splitter 3-4
LNK LED described 4-2
Lobe cabling, recommended

lengths 2-3

Lobe ports 1-3

M

Management

IX-1

INDEX

application support in the

MMAC 1-5

configuration overrides 2-5
MGMT LED described 4-2
Monitoring

with LANVIEW LEDs 4-1 to 4-2

P

PEN LED described 4-2
Phantom current

indicated by LNK LED 4-2
Ports

media type supported 1-3

scope of application 1-3

status of indicated 4-2

R

Ring speed

indicated by 16Mb LED 4-2

setting with JP1 jumper 2-3

speed fault indicated by PEN

LED 4-2

Ring Speed (16Mb) LED

described 4-2

related documentation 1-5
safety specifications 2-5
Unpacking and handling 3-1

Troubleshooting

checklist 4-3, 4-4

W

Wriststrap, anti-static 3-1

S

Speed fault

PEN LED indication of 4-2

protection 1-4
Station attachment 3-4 to 3-5

T

Temperature

operating range 2-5

storage range 2-5
TRMIM-62A

cabling guidelines 2-2 to 2-3

installation in MMACs 3-2

MMAC restrictions 2-1

physical specifications 2-5

recommended reading 1-5

IX-2