Cabletron Systems TRMIM-20R Installation guide

TRMIM-20R

UTP TOKEN RING

CONCENTRATOR

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

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 March 1991 by:

Cabletron Systems, Inc.

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

Printed in the United States of America

Order Number: 9030275-01 March 1991

TRMIM-20R, TRMIM-10R, TRRMIM-16, TRMIM-12,

Remote LANVIEW/Windows, SPECTRUM, and MMAC are

trademarks of Cabletron Systems, Inc.

LANVIEW is a registered trademark 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

received, 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

iii

CONTENTS

CHAPTER 1 INTRODUCTION

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

1.2 The TRMIM-20R..........................................................................1-2

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

1.4 Recommended Reading ...............................................................1-5

1.5 Getting Help ................................................................................1-5

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

2.1.4 Attenuation .......................................................................2-4

2.1.5 Maximum Number Of Stations ........................................2-4

2.1.6 Crosstalk............................................................................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 Ring Sequence ...................................................................2-5

2.2.3 Connector Types................................................................2-6

2.2.4 LANVIEW LEDs ...............................................................2-8

2.2.5 General Specifications ......................................................2-9

CHAPTER 3 INSTALLING THE TRMIM-20R

3.1 Unpacking The TRMIM-20R ......................................................3-1

3.2 Installing The TRMIM-20R Into The MMAC ............................3-2

3.3 Cabling The TRMIM-20R............................................................3-4

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

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

3.4 Finishing The Installation ..........................................................3-8

CONTENTS (CONT.)

CHAPTER 4 TESTING AND TROUBLESHOOTING

4.1 Installation Checkout ..................................................................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-4

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-8

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

iv

CONTENTS

INTRODUCTION

Page 1-1

CHAPTER 1

INTRODUCTION

Welcome to the TRMIM-20R 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-20R.

The TRMIM-20R is a token ring network concentrator used in

conjunction with Cabletron System’s Multi Media Access Center

(MMAC). The TRMIM-20R provides ten trunk coupling unit ports

and passive Ring-In and Ring-Out ports. The TRMIM-20R is IEEE

802.5 compliant, and compatible with IBM products. Since the Ring-

In/Ring-Out ports are passive and do not regenerate signal timing,

Adjusted Ring Length (ARL) must be considered when planning cable

lengths.

Prior to installing and operating the TRMIM-20R, read through this

manual to familiarize yourself with its content and to gain an

understanding of the features of TRMIM-20R. A general working

knowledge of Token Ring (IEEE 802.5) networks will be helpful when

installing the TRMIM-20R.

1.1 USING THIS MANUAL

Chapter 1, Introduction, covers using this document, briefly

describes features of the TRMIM-20R and token ring, and lists

related manuals.

Chapter 2, Installation Requirements/Specifications, lists

network requirements that must be met before you install the

TRMIM-20R and specifications for the TRMIM-20R.

Chapter 3, Installing the TRMIM-20R, describes installing the

TRMIM-20R into the MMAC, connecting stations, and inserting the

TRMIM-20R into a token ring network.

INTRODUCTION

Page 1-2

Chapter 4, Testing and Troubleshooting, describes LANVIEW



,

Cabletron Systems’ built-in visual diagnostic and status monitoring

system, and gives procedures for verifying the proper installation of

the TRMIM-20R.

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 in a passive token ring

network.

1.2 THE TRMIM-20R

The TRMIM-20R, shown in Figure 1-1, is a Media Interface Module

(MIM) that can be installed into a Cabletron Systems’ MMAC-8FNB,

MMAC-8, MMAC-5FNB, MMAC-3FNB or MMAC-3.

The TRMIM-20R functions as a ten port concentrator in a token ring

network providing passive Ring-In and Ring-Out ports and ten trunk

coupling ports.

The TRMIM-20R provides two DB-9 and ten RJ-45 connectors on the

front panel. Two DB-9 connectors permit attachment for shielded

twisted pair (STP) Ring-In and one Ring-Out trunk cabling. Ten

unshielded twisted pair (UTP), RJ-45 connectors support trunk

coupling ports for up to ten token ring stations.

The Ring-In and Ring-Out ports support IBM Type 1, 2, 6 and 9 STP

cable. Each of the TRMIM-20R trunk coupling unit ports supports

station connections via voice grade UTP.

Since the Ring-In and Ring-Out ports are passive trunk connections,

trunk cable length must be calculated giving consideration to

Adjusted Ring Length (ARL). Refer to Appendix C, Calculating

Ring Length, to determine trunk cable length.

INTRODUCTION

Page 1-3

The TRMIM-20R supports voice grade UTP at lobe lengths of up to

100 meters at 4 Mbit/sec and up to 60 meters at 16 Mbit/sec.

Supported cable types and lengths are listed in Chapter 2,

Installation Requirements/Specifications.

Figure 1-1. TRMIM-20R Token Ring Concentrator

TRMIM-20R

RI

RO

UTP

TOKEN RING

1

X

2

X

3

X

4

X

5

X

6

X

7

X

8

X

9

X

10

X

INTRODUCTION

Page 1-4

It is possible to have several network types and media in one MMAC,

such as a shielded twisted pair token ring network and a thin-net

Ethernet network. There are a number of configuration guidelines

concerning multiple networks within an MMAC. These guidelines

are listed in Chapter 3, Installing the TRMIM-20R.

Several MMACs can be connected into the same ring network by

installing token ring concentrators (TRMIM-10R/TRMIM-20R) or

token ring repeaters (TRRMIM-16/TRRMIM-26). The choice between

using concentrators or repeaters depends on specific network

configurations.

The TRMIM-20R incorporates LANVIEW, a useful tool to help you

quickly diagnose physical layer network problems. Several LEDs

(light emitting diodes) are located at the front of the TRMIM-20R.

These LEDs indicate the ring speed, detection of a TRMIM-20R

hardware error, and when a specific port is attached to the ring.

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

monitor the TRMIM-20R, including Cabletron Systems Local

Management, Cabletron Systems Remote LANVIEW Windows, and

Cabletron Systems SPECTRUM.

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-10R Token Ring Concentrator

Media Interface Module Installation Guide.

Cabletron Systems’ TRMIM-12 Token Ring Media Interface

Module Installation Guide.

Cabletron Systems’ TRRMIM-16 Token Ring Repeater Media

Interface Module Installation Guide.

INTRODUCTION

Page 1-5

Cabletron Systems’ TRMIM-22 UTP Passive Token Ring 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

Commercial Building Wiring Standard, EIA Standard

Proposal No. 1907-A (if approved, to be published as EIA/TIA-568)

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

Publishing, Inc.)

1.5 GETTING HELP

If you need additional support related to the Cabletron Systems’

TRMIM-20R, or if you have any questions, comments or suggestions

related to this manual, please contact Cabletron Systems Technical

Support at:

Cabletron Systems

P. O. Box 5005

Rochester, NH 03867-0505

Phone: (603) 332-9400

REQUIREMENTS/SPECIFICATIONS

Page 2-1

CHAPTER 2

INSTALLATION REQUIREMENTS/

SPECIFICATIONS

Before you attempt to install your TRMIM-20R, 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.

2.1 NETWORK REQUIREMENTS

Take care in planning and preparing the cabling and connections for

your network. The quality of the connections, the length of cables

and other conditions of the installation are critical factors in

determining the reliability of your network.

NOTE: While the TRMIM-20R supports voice grade UTP cabling,

some applications, where existing telephone voice grade UTP is used,

may be subject to crosstalk, electrical noise, signal attenuation or other

environmental factors that exceed acceptable limits. This could reduce

the maximum cable lengths or, in extreme cases, prevent using the

existing cables. In some cases acceptable performance will be obtained

by reducing the lobe length or rerouting the cable. Where more severe

interference is encountered, the installation of new cabling may be

necessary.

The following sections describe the network requirements for

TRMIM-20R operation, however, the same requirements apply

whenever UTP cabling is used within a passive ring segment.

2.1.1 Cable Types

Trunk Cabling - The TRMIM-20R supports IBM Type 1, 2, 6 and 9

shielded twisted pair cable.

REQUIREMENTS/SPECIFICATIONS

Page 2-2

Lobe Cabling - In addition to IBM Type 3 unshielded twisted pair

(UTP), the TRMIM-20R supports voice grade UTP cable as described

in EIA Standard Proposal No. 1907-A. Table 2-1 lists IBM cable

types.

2.1.2 Cable Lengths

The TRMIM-20R is a passive concentrator. It neither regenerates

nor retimes ring signals and the cable lengths used with the

concentrator must consider the Adjusted Ring Length (ARL). ARL

results from 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: Lobe Length

and Trunk Length. Their combined length defines the path

between two token ring stations and cannot exceed the maximum

drive distance.

Lobe Length - This is the physical length of UTP cable connecting a

station to the trunk coupling unit (TCU) port on the TRMIM-20R.

The recommended maximum length for the longest UTP 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 exceeds this limit. However, installing a lobe that exceeds the

recommended maximum should be avoided since it 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 passive components

must be considered in the cable length calculations.

REQUIREMENTS/SPECIFICATIONS

Page 2-3

Drive Distance - Drive distance is the limit of reliable signal

propagation without the installation of repeaters in the ring. The

maximum drive distance using Type 1 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. (When UTP lobe cables are

used, as with the TRMIM-20R, determining the overall drive distance

requires converting the UTP cable lengths to their Type 1 equivalent

length and then using the Type 1 equivalent to calculate cable

lengths.)

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 22 AWG solid wire carried

outside of the shield casing. Typically used for voice

communication.

Type 3 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.

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.

NOTES:

1. Refer to Appendix C for cable conversion factors.

2. Table 2-1 lists all cable types for reference. The TRMIM-20R

supports Type 3 for TCU port cabling and Types 1, 2, 6, and 9 as

trunk cabling.

REQUIREMENTS/SPECIFICATIONS

Page 2-4

Table 2-2. Recommended Maximum Lobe Length

Maximum Lobe Length

4 Mbit/sec 16 Mbit/sec

Voice Grade UTP

(or IBM Type 3) 100 meters 60 meters

2.1.3 Impedance

The characteristic impedance for UTP cable is 100 ohms ±15% and

150 ohms (@ 1 MHz to 20 MHz) ±10% for STP cable.

2.1.4 Attenuation

Attenuation values include the attenuation of the cables, connectors,

and patch panels. Maximum attenuation for UTP cable segments

used with the TRMIM-20R is:

4.0 MHz 16.0 MHz

UTP (Voice Grade) 56 dB/km 131 dB/km

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

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

2.1.5 Maximum Number of Stations

The maximum number of stations in a single ring, using UTP cabling,

is 72 stations, regardless of the ring speed.

2.1.6 Crosstalk

Crosstalk is caused by signal coupling between the different cable

pairs contained within a multi-pair cable bundle.

REQUIREMENTS/SPECIFICATIONS

Page 2-5

2.1.7 Noise

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 (104° F), it is

strongly recommended 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 describes the operating specifications for the

TRMIM-20R. Cabletron Systems, Inc. reserves the right to change

these specifications at any time without notice.

2.2.1 Ring Speed

The TRMIM-20R can be operated at a ring speed of either 4 Mbit/s or

16 Mbit/s. Selection of the ring speed is accomplished either by a

hardware jumper on the TRMIM-20R or by software selection. The

software selection overrides the jumper selection.

2.2.2 Ring Sequence

When multiple token ring boards (set to the same ring speed) are

installed in adjacent slots within an MMAC, they can be attached via

the FNB to create a larger ring network. The default configuration

for the TRMIM-20R attaches boards in adjacent slots automatically

at power on, but the configuration can be modified via network

management software, so that adjacent boards are attached or

detached, resulting in changes in the ring sequence.

REQUIREMENTS/SPECIFICATIONS

Page 2-6

When a TRMIM-20R is installed, the ring sequence starts at the

externally accessible Ring-In port. If the concentrator is detached (by

software, incompatible ring speed or empty adjacent slots) from other

token ring boards, the ring sequence is restricted to the TRMIM-20R

and goes from the Ring-In port to each of the TCU ports, in ascending

port number order, and then out the Ring-Out port.

When multiple token ring boards are installed in consecutive slots

and attached via the FNB, the sequence is in ascending slot number

order. When a concentrator, such as the TRMIM-20R is attached via

the FNB to other token ring boards, the ring sequence begins at the

Ring-In port of the concentrator and is first routed out, via the FNB,

to the next (higher slot number) token ring board on the bus. An

empty slot or non-token ring board causes the FNB trunk connection

to loop back to the first token ring board in the sequence and

continues to thread through the TCU ports and token ring boards

until it returns to the concentrator. There, it threads through the

TCU ports and finally to the Ring-Out port.

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

TRMIM-20R 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.

An FNB is installed in the MMAC.

All three boards are attached via the FNB.

The ring sequence for this example is from Slot 2, Ring-In port to the

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

8, 12; then, returning to Slot 2 ports 1, 2, 3, 5, and 6, then out the

Ring-Out port of the TRMIM-20R.

2.2.3 Connector Types

Trunk Coupling Unit Ports - Ten Female RJ-45 connectors are

located on the front panel of the TRMIM-20R. They are labeled 1

through 10. Figure 2-1 shows the pin layout and signal connections

for these connectors.

REQUIREMENTS/SPECIFICATIONS

Page 2-7

Rx +

Tx-

Tx+

Rx-

1

2

3

4

5

6

7

8

FEMALE RJ

-45

TCU Ports: Pin Pin

1 No Connection 5 RX–

2 No Connection 6 TX+

3 TX– 7 No Connection

4 RX+ 8 No Connection

Figure 2-1. Trunk Coupling Unit RJ-45 Pinout

STP Trunk Connections - Two Female DB-9 connectors for

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

TRMIM-20R front panel. Figure 2-2 shows the signal and pin

assignments for the STP ring interface.

Trunk Port: Pin Pin

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

2 Ground 6 RX+ (Main Ring)

3 Ground 7 Ground

4 Ground 8 Ground

9 TX+ (Backup Ring)

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

2 Ground 6 TX+ (Main Ring)

3 Ground 7 Ground

4 Ground 8 Ground

9 RX+ (Backup Ring)

Figure 2-2. Trunk Cable Connections

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 Rin

g)

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

REQUIREMENTS/SPECIFICATIONS

Page 2-8

6

7

8

9

1

2

3

4

5

PRIMARY RING

BACKUP RIN

G

Trunk Wrap Connector - Two male wrap plugs are provided with

each TRMIM-20R. The TRMIM-20R does not automatically wrap.

When no external trunk cable is attached at either ring port (Ring-In/

Ring Out), or if a ring port must be wrapped without using

management software, a wrap plug must be attached to the

appropriate ring port. The wrap plug connects the primary and

backup rings. Figure 2-3 shows the wiring for the wrap plug.

Figure 2-3. Trunk Wrap Plug

2.2.4 LANVIEW LEDs

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

TRMIM-20R. The exact locations and functions for these LEDs are

illustrated in Figure 2-4.

Figure 2-4. TRMIM-20R LANVIEW LEDs

ATTACHED (GREEN - 10)

ERR (Red)

RING-IN/RING-OUT (GREEN - 2)

16 Mb (Yellow)

TRMIM-20R

1

X

7

X

SN

7

8

9

10

1

2

3

4

5

6

ERR

16Mb

A

T

C

H

E

D

A

T

A

T

C

H

E

D

A

T

R I

RO

REQUIREMENTS/SPECIFICATIONS

Page 2-9

Table 2-3. LANVIEW LEDs

Label Color Description

16 Mb Yellow Ring Speed Indicator

ON TRMIM-20R is set for 16 Mbit/sec

OFF TRMIM-20R is set for 4 Mbit/sec

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

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

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

ON The respective port is inserted into the

ring.

OFF The respective port is removed (bypassed)

from the ring.

2.2.5 General Specifications

SAFETY

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

system to which the TRMIM-20R 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.

SERVICE

MTBF (MHBK-217E)> 109,471 hrs.

MTTR < 0.5 hr.

REQUIREMENTS/SPECIFICATIONS

Page 2-10

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)

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Cabletron Systems TRMIM-20R Installation guide

Cabletron Systems TRMIM-20R Installation guide

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