Cabletron Systems TRMIM-10R Installation guide

TRMIM-10R

TOKEN RING

MEDIA INTERFACE MODULE

INSTALLATION GUIDE

CABLETRON SYSTEMS, P. O. Box 5005, Rochester, NH 03867-5005

The Complete Networking Solution

NOTICE

Cabletron Systems reserves the right to make changes in specifica-

tions 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 MAN-

UAL OR THE INFORMATION CONTAINED IN IT, EVEN IF

CABLETRON SYSTEMS HAS BEEN ADVISED OF, KNOWN, OR

SHOULD HAVE KNOWN, THE POSSIBILITY OF SUCH DAM-

AGES.

 Copyright November 1990 by:

Cabletron Systems, Inc.

P.O. Box 5005, Rochester, NH 03867-5005

Printed in the United States of America

Order Number: 9030258 November 90

LANVIEW, Remote LANVIEW Windows, Spectrum,

TRMIM-10R, TRRMIM-16, TRMIM-12, MMAC, and FNB are

trademarks of Cabletron Systems Inc.

IBM is a registered trademark of International Business Machines

Corporation.

NOTICE

i

FCC NOTICE

This device complies with Part 15 of 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 re-

ceived, including interference that may cause undesired operation.

WARNING: This equipment uses and generates and can radiate

radio frequency energy and if not installed properly and used in

accordance with the instruction manual, may cause interference to

radio communications. It has been tested and found to comply with

the limits for a Class A digital device pursuant to Part 15 of FCC

Rules, which are designed to provide reasonable protection against

such interference in a commercial environment. Operation of this

equipment in a residential area is likely to cause interference in

which case the user at his own expense will be required to take

whatever steps may be necessary to correct the interference.

If this equipment does cause interference to radio or television, which

can be determined by turning the equipment off and on, the user is

encouraged to try to correct the interference by one or more of the

following measures:

• Re-orient the receiving antenna.

• Relocate the MMAC with respect to the receiving antenna.

• Move the MMAC away from the receiver.

• Plug the MMAC into a different outlet so that the MMAC and

the receiver are on different branch circuits.

If necessary, the user should consult the dealer or an experienced

radio/television technician for additional suggestions. The user may

find the following booklet prepared by the Federal Communication

Commission helpful:

“How to Identify and Resolve Radio TV Interference Problems”

This booklet is available from the U.S. Government Printing Office,

Washington D.C. 20402 - Stock No. 004-000-00345-4

FCC NOTICE

ii

CONTENTS

CHAPTER PAGE

CHAPTER 1 INTRODUCTION

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

1.2 The TRMIM-10R ..........................................................................1-2

1.3 Related Manuals ..........................................................................1-4

1.4 Recommended Reading................................................................1-4

1.5 Getting Help.................................................................................1-4

CHAPTER 2 INSTALLATION REQUIREMENTS/

SPECIFICATIONS

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

2.1.1 Cable Types ........................................................................2-1

2.1.2 Cable Lengths.....................................................................2-2

2.1.3 Attenuation.........................................................................2-3

2.1.4 Impedance...........................................................................2-4

2.1.5 Crosstalk.............................................................................2-4

2.1.6 Maximum Number of Stations ..........................................2-4

2.1.7 Noise ...................................................................................2-5

2.1.8 Temperature .......................................................................2-5

2.2 Operating Specifications..............................................................2-5

2.2.1 Ring Speed..........................................................................2-5

2.2.2 Connector Types .................................................................2-5

2.2.3 Ring Sequence ....................................................................2-7

2.2.4 LANVIEW LEDs ................................................................2-7

CHAPTER 3 INSTALLING THE TRMIM-10R

3.1 Unpacking the TRMIM-10R........................................................3-1

3.2 Installing the TRMIM-10R into the MMAC...............................3-1

3.3 Attaching Cables to the TRMIM-10R .........................................3-4

3.3.1 Connecting Lobe Cabling ...................................................3-4

3.3.2 Connecting Trunk Cabling ................................................3-6

3.4 Finishing the Installation............................................................3-7

iii

CONTENTS

iv

CONTENTS (Cont.)

CHAPTER 4 TESTING AND TROUBLESHOOTING

4.1 Installation Check-Out ................................................................4-1

4.2 Using LANVIEW .........................................................................4-2

APPENDIX A BASIC TOKEN RING NETWORKS

A.1 Basic Token Ring Operation .......................................................A-1

A.2 Design Considerations .................................................................A-7

APPENDIX B APPLICATIONS

B.1 Adding to an Existing Token Ring Network.............................B-1

B.2 Separate Token Ring Networks in One MMAC .......................B-2

B.3 Token Ring Networks Bridged Together ..................................B-3

B.4 MMAC with Ethernet and Token Ring Simultaneously..........B-3

APPENDIX C CALCULATING RING LENGTH

C.1 Rules for Calculating Cable Lengths ........................................C-1

C.2 Single Wiring Closet Networks .................................................C-2

C.3 Multiple Wiring Closet Networks .............................................C-9

C.4 Calculating Mixed Cable Types ...............................................C-15

INTRODUCTION

Page 1-1

CHAPTER 1

INTRODUCTION

Welcome to the TRMIM-10R Token Ring Passive Concentrator

Media Interface Module Installation Guide. This guide is

designed to serve as a reference for the installation and

troubleshooting of Cabletron Systems' TRMIM-10R.

The TRMIM-10R is a token ring network concentrator used in

conjunction with Cabletron's Multi Media Access Center (MMAC).

The TRMIM-10R provides ten trunk unit coupling ports and passive

Ring-In and Ring-Out ports. The Ring-In/Ring-Out ports and each of

the TRMIM-10R's ten trunk coupling unit ports support IBM



Types

1, 2, 6, and 9 shielded twisted pair cabling. The TRMIM-10R is IEEE

802.5 compliant, and compatible with IBM products.

Prior to installing and operating the TRMIM-10R, read through this

manual completely to familiarize yourself with its content and to gain

an understanding of the features of the TRMIM-10R. A general

working knowledge of token ring (IEEE 802.5) networks will be

helpful when installing the TRMIM-10R.

1.1 USING THIS MANUAL

Chapter 1, Introduction, covers using this document, briefly

describes features of the TRMIM-10R and token ring, and concludes

with a list of related manuals.

Chapter 2, Installation Requirements/Specifications, lists

network requirements that must be met before you install the

TRMIM-10R and specifications for the TRMIM-10R.

Chapter 3, Installing the TRMIM-10R, describes installing the

TRMIM-10R into the MMAC, attaching station cabling and

connecting the TRMIM-10R to a token ring network.

Chapter 4, Testing and Troubleshooting, includes a description of

LANVIEW, Cabletron Systems' built-in visual diagnostic and

status monitoring system and procedures for verifying the proper

installation of the TRMIM-10R.

INTRODUCTION

Page 1-2

Appendix A, Basic Token Ring Networks, covers basic operation

and concepts related to the design of token ring networks.

Appendix B, Applications, presents a variety of network

configurations, showing practical applications for several Cabletron

Systems' token ring products.

Appendix C, Calculating Ring Length, describes methods for

calculating various ring cable lengths for passive devices in a token

ring network.

1.2 THE TRMIM-10R

This section outlines some of the basic features of the TRMIM-10R.

The TRMIM-10R, shown in Figure 1-1, is a Media Interface Module

(MIM) that can be installed into a Cabletron Systems' MMAC (Multi

Media Access Center). The TRMIM-10R functions as a ten port

concentrator module in a token ring network providing passive Ring-

In and Ring-Out ports and ten trunk coupling ports.

Twelve DB-9 connectors on the front panel of the TRMIM-10R

provide one Ring-In port, one Ring-Out port for connecting the

TRMIM-10R into a token ring network and ten trunk coupling ports

for attaching ten stations.

The TRMIM-10R supports lobe lengths up to 200 meters at 4 Mbit/sec

and 100 meters at 16 Mbit/sec using IBM Type 1 or Type 2 shielded

twisted pair cable. The supported types and lengths of cables are

listed in Chapter 2, Installation Requirements/Specifications.

The Ring-In/Ring-Out ports provide passive trunk connections using

IBM Type 1 or Type 2 shielded twisted pair cable. Trunk cable

lengths must consider Adjusted Ring Length (ARL). Refer to

Appendix C, Calculating Ring Length, to determine trunk cable

length.

The Flexible Network Bus (FNB) provides an internal trunk

connection between multiple Cabletron Systems' Token Ring products

operating at the same ring speed and installed in consecutive slots

within the same MMAC. The FNB is an active interface that

regenerates and retimes ring signals between boards on the FNB.

INTRODUCTION

Page 1-3

Several LEDs are located on the front panel of the TRMIM-10R.

These LEDs indicate the ring speed, the detection of a hardware error

in the TRMIM-10R, and the status of TRMIM-10R ports. These

LEDs are a useful tool for quickly diagnosing physical layer problems.

A variety of network manangment tools can be used to control and

monitor the TRMIM-10R, including Cabletron Systems Local

Management, Cabletron Systems Remote LANVIEW Windows, and

Cabletron Systems Spectrum.

Figure 1-1. TRMIM-10R Token Ring Concentrator

TOKEN RING

TRMIM-10R

1

2

3

4

5

6

7

8

9

10

RI

RO

INTRODUCTION

Page 1-4

1.3 RELATED MANUALS

The manuals listed below should be used to supplement the

procedures and other technical data provided in this manual. The

procedures in them will be referenced, where appropriate, but will not

be repeated in this document.

Cabletron Systems' Multi-Media Access Center Overview and

Set Up Guide.

Cabletron Systems' TRMIM-12 Token Ring Media Interface

Module Installation Guide.

Cabletron Systems' TRRMIM-16 Token Ring Repeater Media

Interface Module Installation Guide.

1.4 RECOMMENDED READING

The following publications are recommended if more information is

required on implementing a Token Ring network.

Local Area Networks, Token Ring Access Method, IEEE

Standard 802.5

LAN Troubleshooting Handbook, Mark Miller (1989, M&T

Publishing, Inc.)

1.5 GETTING HELP

If you need additional support related to the Cabletron Systems'

token ring products, or if you have any questions, comments or

suggestions related to this manual, please contact Cabletron Systems'

Technical Support at:

Cabletron Systems

35 Industrial Way

P. O. Box 5005

Rochester, NH 03867-5005

Phone: (603) 332-9400

REQUIREMENTS/SPECIFICATIONS

Page 2-1

CHAPTER 2

INSTALLATION REQUIREMENTS/

SPECIFICATIONS

Before you attempt to install Cabletron Systems' token ring products,

review the installation requirements and operating specifications

outlined in this chapter. The conditions, guidelines and requirements

described in this chapter must be met to obtain satisfactory

performance from this equipment. The reliability of the network is

determined by the quality of the connections, the length of the cables

and other conditions of the installation.

2.1 NETWORK REQUIREMENTS

The following subsections summarize the network requirements to

operate this equipment.

2.1.1 Cable Types

The TRMIM-10R supports IBM shielded twisted pair cable Types 1,

2, 6, and 9 for Lobe and Trunk cabling. Table 2-1 lists all of the IBM

cable types for reference, but the TRMIM-10R supports Types 1, 2, 6,

and 9 only.

Table 2-1. IBM Cable Types

Type 1 Two shielded twisted pairs (STP) of 22 AWG solid wire

for data. Used for the longest cable runs within the

walls of buildings.

Type 2 Similar to Type 1 data cable, but having four additional

unshielded twisted pairs of 24 AWG solid wire. These

are carried outside of the shield casing and are typically

used for voice communication. Frequently used to wire

cable runs within the walls of buildings.

REQUIREMENTS/SPECIFICATIONS

Page 2-2

Table 2-1 (cont.). IBM Cable Types

Type 3 Usually four unshielded twisted pairs (UTP) of 24 AWG

solid wire for data or voice communication. Used for

cable runs in walls of buildings.

Type 5 Two 100/140 µm optical fibers in a single sheath.

Type 6 Two STP of 26 AWG stranded wire for data. This type is

used in patch panels or to connect devices to/from wall

jacks. Attenuation for Type 6 cable is 3/2 x Type 1 cable

(66 m of Type 6 = 100 meters of Type 1).

Type 8 One flat STP of 26 AWG stranded wire for under carpet

installation.

Type 9 Similar to Type 1, but uses 26 AWG solid wire.

Attenuation for Type 9 cable is 3/2 x Type 1 cable (66 m

of Type 9 = 100 meters of Type 1).

2.1.2 Cable Lengths

The TRMIM-10R is a passive concentrator. It neither regenerates

nor retimes ring signals and the cable lengths used for the TRMIM-

10R must consider the Adjusted Ring Length (ARL). ARL results

from automatic recovery processes that attempt to restore continuity

to a broken ring. The ARL is the longest potential ring length, the

ring that would exist following recovery from a failure of the shortest

ring segment trunk cable. Refer to the discussion of token ring

concepts related to ARL in Appendix A. Appendix C describes how to

calculate cable lengths in your network, giving consideration to ARL.

Considering ARL, two cable lengths must be defined for the TRMIM-

10R: Lobe Length and Trunk Length. Their combined length defines

the path between two token ring stations and cannot exceed the

maximum drive distance.

• Drive Distance - Drive distance is the limit of reliable signal

propagation without the installation of repeaters in the ring. The

maximum drive distance using STP cabling is 770 meters (2525

feet) at 4 Mbit/sec and 346 meters (1138 feet) at 16 Mbit/sec.

These limits include the combined length of all trunk cables plus

twice the length of the longest lobe cable.

REQUIREMENTS/SPECIFICATIONS

Page 2-3

• Lobe Length - This is the physical length of STP cable

connecting a station to the trunk coupling unit (TCU) port on the

TRMIM-10R. The recommended maximum length for the longest

lobe cable is shown in Table 2-2. This is a recommended

maximum because cable length calculations for passive ring

connections described in Appendix C could produce a maximum

lobe length for your network that differs from this limit.

Installing a lobe that exceeds the recommended maximum could

restrict future expansion of the network.

• Trunk Length - This is the physical length of the STP cabling in

the main ring path, from Ring-Out to Ring-In on each of the

attached token ring devices. The cable budget for the trunk

cabling must be determined by performing the calculations

described in Appendix C. In a totally passive ring (no repeaters

or active concentrators, etc. on the ring), the entire trunk length

must be included in calculation of cable lengths. When only a

portion of the ring is passive, the combined length of the trunk

cabling between the active components must be considered in the

cable length calculations.

Table 2-2. Lobe Cabling

Maximum Lobe Length

4 Mbit/sec 16 Mbit/sec

STP (IBM Types 1 & 2) 200 meters 100 meters

STP (IBM Type 6) 30 meters 30 meters

(only for station to wall

jack and patch panels)

STP (IBM Type 9) 130 meters 65 meters

2.1.3 Attenuation

Maximum attenuation for specific cable types according to ring speed,

is shown by Table 2-3. Since there are two possible ring speeds, two

frequencies are listed, namely 4.0 MHz and 16 MHz. The attenuation

values include the attenuation of the cables, connectors, and patch

panels.

REQUIREMENTS/SPECIFICATIONS

Page 2-4

Table 2-3. Maximum Cable Attenuation

4.0 MHz 16.0 MHz

STP (IBM Types 1 & 2) 22 dB/km 45 dB/km

STP (IBM Types 6 & 9) 33 dB/km 66 dB/km

2.1.4 Impedance

The characteristic impedances for specific cable types are listed in

Table 2-4. These are typical impedances, and can vary among

different manufacturers of cabling.

Table 2-4. Cable Impedance

Cable Type Characteristic Impedance

STP (IBM Types 1 & 2) 150 ohms (1 MHz to 20 MHz) ±10%

STP (IBM Types 6 & 9) 150 ohms (1 MHz to 20 MHz) ±10%

2.1.5 Crosstalk

Crosstalk is caused by signal coupling between the different cable

pairs contained within a multi-pair cable bundle. In shielded twisted

pair cables, the effects of crosstalk are minimized.

2.1.6 Maximum Number of Stations

Table 2-5 shows the maximum number of stations that can be

inserted into a single ring using STP cabling according to ring speed.

Table 2-5. Maximum Number of Stations

4 Mbit/sec 16 Mbit/sec

Number of Stations 250 stations 136 stations

NOTE: If unshielded twisted pair (UTP) cabling is used with

STP in the same ring, the number of stations is determined by

the UTP specification.

REQUIREMENTS/SPECIFICATIONS

Page 2-5

2.1.7Noise

Noise can be caused by either crosstalk or externally induced

impulses. If noise induced errors are suspected, it may be necessary

to re-route cabling away from potential noise sources (motors,

switching equipment, high amperage equipment), or to ensure that

the electrical wiring in the area is properly wired and grounded.

2.1.8 Temperature

The attenuation of PVC insulated cable varies significantly with

temperature. At temperatures greater than 40° C, we strongly

recommend that you use plenum-rated cables to ensure that cable

attenuation remains within specification. Check the cable

manufacturer's specifications.

2.2 OPERATING SPECIFICATIONS

This section includes the operating specifications for the TRMIM-10R.

Cabletron Systems Inc. reserves the right to change these

specifications at any time without notice.

2.2.1 Ring Speed

The TRMIM-10R can be operated at a ring speed of either 4 Mbit/sec

or 16 Mbit/sec. The default ring speed is set by a hardware jumper on

the TRMIM-10R. The ring speed can be changed via a software

selection (refer to the applicable Remote LANVIEW Network

Management Users Guide) that overrides the jumper selection.

2.2.2 Connector Types

• Trunk Coupling Unit Ports - Ten Female DB-9 connectors are

located on the front panel of the TRMIM-10R. They are labeled 1

through 10, corresponding to the ten Trunk Coupling Unit (TCU)

ports. Figure 2-1 shows the pin layout and signal connections for

these connectors.

REQUIREMENTS/SPECIFICATIONS

Page 2-6

FEMALE DB-9 RECEPTACLE

RX+

TX+

6

7

8

9

1

2

3

4

5

TX-

RX-

Common Ground

Common

Ground

TCU PORT

Common Ground

Not Connected

FEMALE DB-9 RECEPTACLE

TX+ (Backup Ring)

6

7

8

9

1

2

3

4

5

(Main Ring) RX-

Common

Ground

Common

Ground

(Backup Ring) TX-

FEMALE DB-9 RECEPTACLE

RX+ (Backup Ring)

6

7

8

9

1

2

3

4

5

(Main Ring) TX-

Common

Ground

Common

Ground

(Backup Ring) RX-

RX+ (Main Ring)

TX+ (Main Ring)

RING- IN RING-OUT

TCU Ports: Pin Pin Pin

1 TX– 4 Ground 7 Ground

2 Ground 5 RX– 8 Ground

3 Not Used 6 TX+ 9 RX+

Figure 2-1. TCU Ports Pinouts

• Trunk Connections - Two Female DB-9 connectors for

attaching STP trunk cables are located on the lower left side of

the TRMIM-10R front panel. Figure 2-2 show the signal and pin

assignments for the STP ring interface.

Trunk Ports: Pin Pin

Ring-In 1 RX– (Main Ring) 5 TX– (Backup Ring)

2 Ground 7 Ground

3 Ground 6 RX+ (Main Ring)

4 Ground 8 Ground

9 TX+ (Backup Ring)

Ring-Out 1 TX– (Main Ring) 5 RX– (Backup Ring)

2 Ground 7 Ground

3 Ground 6 TX+ (Main Ring)

4 Ground 8 Ground

9 RX+ (Backup Ring)

Figure 2-2. Trunk Cable Connections

REQUIREMENTS/SPECIFICATIONS

Page 2-7

2.2.3 Ring Sequence

The ring sequence on the TRMIM-10R begins at the Ring-In, goes out

to the Flexible Network Bus (FNB) then, after threading through

other attached token ring boards, returns from the FNB to sequence

through the TCU ports (in port number order) and finally out the

Ring-Out port. The following example serves to illustrate the ring

sequence in an MMAC with multiple token ring boards:

Example: TRMIM-22P in slot 1 with ports 2, 5, 8, & 12 in use.

TRMIM-10R in slot 2 with ports 1, 2, 3, 5, and 6 in use.

TRMIM-12 in slot 3 with ports 1, 5, 7, 11, & 12 in use.

All three boards are attached via the FNB.

The ring sequence in this example is from Slot 2, Ring-In port via the

FNB to Slot 3, ports 1, 5, 7, 11, 12, via the FNB to Slot 1 ports 2, 5, 8,

12; then, returning to the TRMIM-10R in Slot 2 threading through

ports 1, 2, 3, 5, and 6, then out the Ring-Out port.

2.2.4 LANVIEW LEDs

There are a number LANVIEW LEDs on the front panel of the

TRMIM-10R. The exact locations for these LEDs are illustrated in

Figure 2-3. Table 2-6 describes the functions for each LED.

Table 2-6. LANVIEW LEDs

Label Color Description

16 Mb Yellow Ring Speed Indicator

ON TRMIM-10R is set for 16 Mbit/sec

OFF TRMIM-10R is set for 4 Mbit/sec

RI/RO Green Ring-In/Ring-Out Status (2)

Status ON Respective ring port is in a non-wrap state

OFF Respective ring port is in a wrap state

ERR Red ON TRMIM-10R hardware error detected

OFF Normal operation

Link Green Link Attached (10 - One LED for each TCU port)

Attached ON The respective port is inserted into the ring.

OFF The respective port is removed (bypassed)

from the ring.

REQUIREMENTS/SPECIFICATIONS

Page 2-8

SN

16Mb

ERR

TRMIM-10R

17

LINK ATTACHED (Green) LED

(one for each trunk coupling port)

ERR (Red) LED

16Mb (Yellow) LED

TOKEN RING

5

6

RI

RO

RING-IN/RING-OUT PORT STATUS (Green) LED

Figure 2-3. TRMIM-10R LANVIEW LEDs

SAFETY

WARNING: It is the responsibility of the person who sells the

system to which the TRMIM-10R will be a part to ensure that the

total system meets allowed limits of conducted and radiated

emissions.

This equipment is designed in accordance with UL478, UL910,

NEC 725-2(b), CSA, IEC, TUV, VDE Class A, and meets FCC

part 15, Class A limits.

REQUIREMENTS/SPECIFICATIONS

Page 2-9

SERVICE

MTBF (MHBK-217E): >119,951 hrs.

MTTR: <0.5 hr.

PHYSICAL

Dimensions: 13.4D x 11.5H x 2.0W inches

(34.0D x 29.2H x 5.1W centimeters)

(includes front panel)

Weight: 2 lbs. 2 oz.

(963.9 grams)

INSTALLING THE TRMIM-10R

Page 3-1

CHAPTER 3

INSTALLING THE TRMIM-10R

This chapter contains instructions for configuring and installing the

TRMIM-10R into a MMAC and includes instructions for connecting

station and trunk cabling. Check that all requirements listed in

Chapter 2, Installation Requirements/Specifications, are met before

installing the MIM.

3.1 UNPACKING THE TRMIM-10R

Prior to installation, unpack and visually inspect the TRMIM-10R for

damage:

1. Carefully remove the TRMIM-10R from the shipping box. Save

the box and materials in the event that the unit has to be repack-

aged and shipped.

CAUTION: Electro-Static Discharges (ESD) will damage the

TRMIM-10R. Observe all precautions to prevent electrostatic

discharges and when handling the TRMIM-10R, hold only the

edges of the board or the metal front panel. Avoid touching the

components or surface of the TRMIM-10R.

2. Remove the TRMIM-10R from its protective plastic bag and set it

on top of its protective bag in a static free area.

3. Inspect the MIM for physical damage and contact Cabletron

Systems' Technical Support immediately if any problems exist.

3.2 INSTALLING THE TRMIM-10R INTO THE MMAC

The TRMIM-10R is designed to be easily installed into an MMAC

product. When you install the TRMIM-10R, the following guidelines

must be followed:

• Slot 0 of the MMAC is a reserved slot. The TRMIM-10R cannot

be installed into Slot 0.

INSTALLING THE TRMIM-10R

Page 3-2

• If the TRMIM-10R is being installed into an MMAC-8, or MMAC-

8FNB, be sure that a Power Supply Module (PSM or PSM-R) is

installed in the associated rear power supply slot. The PSM or

PSM-R is the source of power for MMAC modules. One PSM or

PSM-R is required for every two MIMs.

NOTE: The PSM-R is a Redundant Power Supply Module, that is

recommended for use with the MMAC-8FNB (equipped with a

Flexible Network Bus).

• To link several Cabletron Systems' Token Ring products that are

installed in the same MMAC, the MMAC must be configured with

a backplane and the boards must be set to the same ring speed

and in consecutive slots.

Install the TRMIM-10R as follows:

1. Position the hardware jumper on the proper pins on the TRMIM-

10R to select either 4 or 16 Mbit/sec as the default ring speed (see

Figure 3-1). The speed setting affects the number of stations and

the maximum lobe length. Refer to Chapter 2, Installation

Requirements/Specifications for additional information.

NOTE: The network speed is also selectable by software. The

software selection overrides the hardware jumper selection.

2. Power the MMAC chassis off, if it is not already powered off, by

unplugging the AC power cord from the wall outlet.

3. Remove the selected blank panel from the MMAC and slide the

TRMIM-10R (see Figure 3-2) into the MMAC card cage. Be sure

that the board is in the guides at the top and bottom of the card

cage.

4. Secure the module to the MMAC by tightening the knurled knobs.

Failure to firmly secure the MIM may result in improper opera-

tion.

5. Power the MMAC chassis on.

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