Cabletron Systems 36, FOMIM-32, FOMIM-36, FOMIM-38 User Manual

FOMIM-32/36/38 FIBER OPTIC

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: 9030524-01 July 1996

SPECTRUM, LANVIEW, MicroMMAC
Manager, EPIM, EPIM-A, EPIM-F1, EPIM-F2, EPIM-F3, EPIM-T, EPIM-X, FOMIM,
FOT-F, FOT-F3, HubSTACK, SEH, SEHI

All other product names mentioned in this manual may be trademarks or registered trademarks of
their respective companies.

, and

, and

BRIM

TMS-3

are registered trademarks and

are trademarks of Cabletron Systems, Inc.

Element

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

FOMIM User’s Guide i

This document was created with FrameMaker 4.0.2

Printed on Recycled Paper

Notice

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:

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
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AGREE TO THE TERMS OF THIS AGREEMENT, PROMPTLY RETURN THE UNUSED
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Before utilizing this product, carefully read this License Agreement.

ii FOMIM User’s Guide

CABLETRON SOFTWARE PROGRAM LICENSE

Notice

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.

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

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CABLETRON DISCLAIMS ALL WARRANTIES, OTHER THAN THOSE SUPPLIED TO
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252.227-7013. Cabletron Systems, Inc., 35 Industrial Way, Rochester, New Hampshire 03867-0505.

FOMIM User’s Guide iii

Notice

DECLARATION OF CONFORMITY

Application of Council Directive(s):

Manufacturer’s Name:

Manufacturer’s Address:

European Representative Name:

European Representative Address:

Conformance to Directive(s)/Product Standards:

Equipment T ype/Environment:

89/336/EEC
73/23/EEC

Cabletron Systems, Inc.
35 Industrial Way

PO Box 5005
Rochester, NH 03867

Mr. J. Solari
Cabletron Systems Limited

Nexus House, Newbury Business Park
London Road, Newbury
Berkshire RG13 2PZ, England

EC Directive 89/336/EEC
EC Directive 73/23/EEC
EN 55022
EN 50082-1
EN 60950

Networking Equipment, for use in a
Commercial or Light
Environment.

Industrial

We the undersigned, hereby declare that the equipment packaged with this notice conforms to
the above directives.

Manufacturer Legal Representative in Europe
Mr. Richard Michaud Mr. J. Solari

___________________________________ ___________________________________

Full Name Full Name
Manager of Engineering Services Managing Director - E.M.E.A.

___________________________________ ___________________________________

Title Title
Rochester, NH, USA Newbury, Berkshire, England

___________________________________ ___________________________________

Location Location

iv FOMIM User’s Guide

CONTENTS

CHAPTER 1 INTRODUCTION

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

1.2 Document Conventions...............................................................1-3

1.3 Fiber Optic Media Interface Modules...........................................1-3

1.3.1 Distance and Cable Type ...............................................1-3

1.3.2 Multi Media Access Centers ........................................... 1-4

1.4 LANVIEW Status Monitoring System ..........................................1-4

1.5 Related Manuals..........................................................................1-6

1.6 Getting Help.................................................................................1-6

CHAPTER 2 NETWORK REQUIREMENTS AND INSTALLATION

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

2.1.1 Fiber Optic Network Design Guidelines..........................2-1

2.2 Unpacking the FOMIM.................................................................2-2

2.3 Installing the FOMIM into the MMAC...........................................2-3

2.4 Connecting Fiber Optic Cabling to the FOMIM............................2-4

CHAPTER 3 TESTING AND TROUBLESHOOTING

3.1 Installation Test ...........................................................................3-1

3.1.1 Testing the Fiber Optic Link Segment ............................3-1

3.1.2 Link Test ......................................................................... 3-2

3.2 Pre-Installation Test.....................................................................3-3

3.3 Using LANVIEW..........................................................................3-4

APPENDIX A FOMIM SPECIFICATIONS

INDEX

FOMIM User’s Guide v

Contents

vi FOMIM User’s Guide

CHAPTER 1

INTRODUCTION

Welcome to the Cabletron Systems

Media Interface Module User’s Guide

to serve as a simple installation and reference guide for the FOMIM, and
to explain the capabilities and special features of the module. Before
using the FOMIM, you need to carefully read through this manual to gain
a full understanding of the FOMIM and its capabilities.

Cabletron Systems offers three versions of 1300 nm single mode Fiber
Optic Media Interface Modules:

• FOMIM-32 providing 12 links with ST type connectors

• FOMIM-36 providing 6 links with ST type connectors

• FOMIM-38 providing 18 links with ST type connectors

FOMIM-32/36/38 Fiber Optic

. We have designed this manual

1.1 USING THIS MANUAL

Chapter 1,
the Cabletron Systems FOMIMs (Figure 1-1). This chapter also includes
a list of related manuals.

Introduction

, discusses the capabilities and special features of

Chapter 2,
network requirements that must be met before you install the FOMIM and
instructions for installing the FOMIM into the MMAC chassis.

Chapter 3,
and troubleshooting the installation of the FOMIM. Instructions for using
LANVIEW, Cabletron Systems built-in visual diagnostic and status
monitoring system, are also included.

Appendix A,
and environmental requirements for the FOMIM.

FOMIM User’s Guide 1-1

Network Requirements and Installation

Testing and Troubleshooting

FOMIM Specifications

, provides procedures for testing

, contains operational specifications

, contains a list of

Chapter 1:

Introduction

It is assumed that you have a general working knowledge of Ethernet or
IEEE 802.3 type data communications networks and their physical layer
components.

1-2 FOMIM User’s Guide

Figure 1-1 The FOMIMs

Document Conventions

1.2 DOCUMENT CONVENTIONS

The following conventions are used throughout this document:

Note

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

NOTE

information that may be of special importance.

!

CAUTION

Caution

damage to the equipment.

Warning

equipment damage, personal injury or death.

symbol. Contains information essential to avoid

symbol. Warns against an action that could result in

1.3 FIBER OPTIC MEDIA INTERFACE MODULES

Cabletron Systems Fiber Optic Media Interface Modules provide a choice
of six, twelve, or eighteen ports with ST connectors.

The FOMIM-32/36/38 use 1300 nm wavelength transmitters

NOTE

and receivers (not the 850 nm specified by FOIRL) and should
be used only with the Cabletron Systems Ethernet single mode
transceiver, the FOT-F3.

1.3.1 Distance and Cable Type

The FOMIMs support single mode fiber optic cable for sizes such as

µ

8.3/125
cable distance is dependent on the cable type and the overall system fiber
optic budget. If the system budgets and timing constraints are met, then a
distance of up to 5 kilometers is possible. You can also use 62.5/125
multimode cable with the FOMIM, but due to greater optical loss, signal
distance is reduced to 2 km.

FOMIM User’s Guide 1-3

m, 8.7/125 µm, 9/125 µm, 10/125 µm, and 12/125 µm. The

µ

m

Chapter 1:

Introduction

1.3.2 Multi Media Access Centers

The Cabletron Systems Fiber Optic Media Interface Modules are
designed to be installed into the Cabletron Systems Multi Media Access
Center (MMAC). The modular design of the MMAC allows the FOMIM
to co-exist with other Media Interface Modules (MIMs) to provide a
variety of different media connections on any one point.

Each packet entering the FOMIM is repeated by the repeater module in
the MMAC. Each packet that enters the repeater module is regenerated
and retimed, which assures data integrity and maximum data path
distance. In addition, the repeater feature ensures fault isolation, because
the repeater module automatically segments problem ports from the
network. A segmented port automatically reconnects to the network once
the port receives a good packet.

The repeater module also allows you to access the network management
capabilities that enable you to control the FOMIM and its attached
segments. For example, information on the number of good packets and
collisions that have passed through the FOMIM and each port on the
MIM can be gathered. For more information on managing the FOMIM,
refer to your specific management module Local Management Guide.

1.4 LANVIEW STATUS MONITORING SYSTEM

The FOMIM uses Cabletron Systems built-in visual diagnostic and status
monitoring system, LANVIEW. Using LANVIEW, network
troubleshooting personnel can quickly scan the LANVIEW LEDs to
observe network status, diagnose network problems, and determine which
node or segment is faulty (see Figure 1-2).

1-4 FOMIM User’s Guide

LANVIEW Status Monitoring System

LANVIEW LEDs

Figure 1-2 LANVIEW LEDs

The following discusses the function of each LANVIEW LED on the
FOMIM (Figure 1-2). Note that there is one Link OK (LNK) and one
Receive (RCV) LED for each port on the MIM, as well as one Error
(ERR) and one Collision (CLN) LED for the entire MIM.

Link OK (LNK) LED

When lit, this green LED indicates that a link has been established
between the receive circuitry of the FOMIM and the transmit circuitry of
the fiber optic device at the other end of the link segment. This LED
remains lit as long as the link is maintained.

Receive (RCV) LED

When lit, this yellow LED indicates that a data packet is being received
on that port. The flash of the LED is pulse stretched for viewing effect.

Collision (CLN) LED

When lit, this red LED indicates that a collision is occurring on one of the
fiber segments attached to a fiber optic port on the FOMIM. The flash of
the LED is pulse stretched for viewing effect.

FOMIM User’s Guide 1-5

Chapter 1:

Error (ERR) LED

Introduction

When lit, this red LED indicates the temperature within the MMAC

°

chassis has risen to 40

C or greater. The FOMIM alerts the management

board, and the FOMIM in turn receives a signal to light the LED.

1.5 RELATED MANUALS

The manuals listed below should be used to supplement the procedures
and other technical data provided in this manual. The procedures
contained in these manuals will be referenced, rather than repeated, in this
manual.

Cabletron Systems

MMAC-M5FNB, and MMAC-M8FNB) Overview and Set Up Guides

Cabletron Systems

Multi Media Access Center (MMAC-M3FNB,

.

FOT-F3 Fiber Optic Transceiver User's Manual.

1.6 GETTING HELP

If you need additional support related to this device, or if you have any
questions, comments, or suggestions concerning this manual, contact
Cabletron Systems Technical Support:

By phone [phone]

A.M

Monday – Friday; 8
By CompuServe GO CTRON from any ! prompt
By Internet mail [e-mail]
By FTP ctron.com (134.141.197.25)

Login
Password

anonymous

your email address

. – 8 P.M. Eastern T ime

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., changing mode switches, rebooting the unit, etc.)

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

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

1-6 FOMIM User’s Guide

Getting Help

• The serial and revision numbers of all Cabletron Systems products in
the network

• The device history (i.e., have you returned the device before, is this a
recurring problem, etc.)

• Any previous Return Material Authorization (RMA) numbers

FOMIM User’s Guide 1-7

Chapter 1:

Introduction

1-8 FOMIM User’s Guide

CHAPTER 2

NETWORK REQUIREMENTS AND

INSTALLATION

This chapter begins with network design guidelines in Section 2.1,

Network Cable Requirements

module in a network. It then provides instructions for installing the
Cabletron Systems Fiber Optic Media Interface Module into the MMAC
family of modular hubs.

2.1 NETWORK CABLE REQUIREMENTS

When connecting fiber optic segments to the FOMIM, you must follow
the network guidelines listed below. Failure to do so may result in
unsatisfactory network performance.

, that must be met before installing the

2.1.1 Fiber Optic Network Design Guidelines

• The fiber optic link segment should consist of 8/125 – 12/125 µm

µ

single mode fiber optic cabling. You can also use 62.5/125
multimode cable with the FOMIM. However, optical loss will be
greater with multimode cable and distances will be limited to 2 km.

• The fiber optic cable must be tested with a fiber optic attenuation test
set that is adjusted for a 1300 nm wave length. This test verifies that
the signal loss in a cable is within an acceptable level of 9.0 dB or less
for any given single mode fiber optic link.

• When determining the maximum fiber optic cable length, the fiber
optic budget (total loss of 9.0 dB or less between stations) and total
network propagation delay should be calculated and considered before
fiber runs are incorporated in any network.

Fiber optic budget is the combination of the optical loss due to the
fiber optic cable, in-line splices, and fiber optic connectors (the loss
for each splice and connector is typically 1 dB or less).

m

FOMIM User’s Guide 2-1

Chapter 2:

Network Requirements and Installation

Propagation delay is the amount of time it takes a packet to travel from
the sending device to the receiving device. Total propagation delay

µ

allowed for the entire network is 25.6

s. If the total propagation delay

between any two nodes on the network exceeds 25.6 µs, then bridges
should be used.

• When using single mode fiber optic cable, segment lengths up to 5 km
are possible if system budgets are met.

2.2 UNPACKING THE FOMIM

Unpack the module as follows:

The module is very sensitive to static discharge. Observe all

!

CAUTION

electrostatic precautions while handling the FOMIM.

1. Remove the shipping material covering the FOMIM in the shipping
box.

2. Verify the contents of the shipping box. The box, as packed should
contain one FOMIM, one grounding strap, and one user’s guide.

3. Carefully remove the FOMIM from the shipping box. Leave the
module in its conductive bag until you are ready to install it. Save the
shipping box and materials in the event the unit has to be reshipped.

4. Visually inspect the module within the nonconductive bag. If you see
any damage, contact Cabletron Systems Technical Support
immediately.

2-2 FOMIM User’s Guide

Installing the FOMIM into the MMAC

2.3 INSTALLING THE FOMIM INTO THE MMAC

You can easily install the FOMIM into a Multi Media Access Center with
a Flexible Network Bus (MMAC-FNB). Install the FOMIM into the
MMAC as follows:

1. Power down the MMAC hub.

2. Remove any chassis safety bars present on the front of the MMAC

hub.

3. Slide the FOMIM (Figure 2-1) into the card cage of the MMAC hub.

Be sure that the card is properly aligned in the top and bottom slots of
the card cage.

Slot 1 of the MMAC hub is reserved f or a management module

NOTE

(e.g., IRM3) only.

4. Firmly press the module connections into the backplane. Do not force

the module into place or use the knurled knobs to draw the module into
place.

5. Screw in the knurled knobs to secure the module to the MMAC.

6. Reinstall any chassis safety bars that were present on the MMAC.

FOMIM

MMAC-8FNB

FOMIM User’s Guide 2-3

Figure 2-1 Installing the FOMIM

Chapter 2: Network Requirements and Installation

2.4 CONNECTING FIBER OPTIC CABLING TO THE

FOMIM

Each fiber optic link consists of two strands of fiber optic cabling: the
transmit (TX) and the receive (RX). The transmit strand from a module
port connects to the receive port of a fiber optic Ethernet device at the
other end of the segment. The receive strand of the applicable port on the
module connects to the transmit port of the fiber optic Ethernet device.

Cabletron Systems recommends labeling fiber optic cables to indicate
receive and transmit ends. Many cables are prelabeled, providing
matching labels or tapes at both ends of each strand of cable.

1. Remove the protective plastic covers from the fiber optic ports on the
applicable port on the module, and from the ends of the connectors on
each fiber strand.

Do not touch the ends of the fiber optic strands, and do not let

!

CAUTION

the ends come in contact with dust, dirt, or other contaminants.
Contamination of the ends can cause problems in data
transmissions. If the ends become contaminated, clean them
with denatured alcohol using a soft, clean, lint free cloth.

2. Attach one fiber to the applicable receive port on the module. Insert
the ST connector into the port with the alignment slot on the connector
clockwise to lock it down.

Figure 2-2 ST Connector Insertion

3. Attach the other fiber of the pair to the applicable transmit port on the
module. Use the same procedure for insertion of the ST connector.

2-4 FOMIM User’s Guide

Connecting Fiber Optic Cabling to the FOMIM

4. At the other end of the fiber optic cable, attach the fiber pair to the

transmit and receive ports of the device.

If link indicators are present for the fiber optic connection, check that they
are ON. If an indicator is present but not ON, that port does not have a
valid link. Perform each of the follo wing steps until you reach a resolution
of the problem and achieve a link.

• Check that the device at the other end of the link is ON.

• V erify proper cross-o ver of the fiber strands. Try sw apping the transmit

and receive connections at only one end of the link.

• Verify that the fiber connection meets the dB loss specifications

outlined in Appendix A, FOMIM Specifications.

If you are still unable to establish a link, attempt to make the connection
between the devices with another fiber optic cable. If this is unsuccessful,
contact Cabletron Systems Technical Support.

FOMIM User’s Guide 2-5

Chapter 2: Network Requirements and Installation

2-6 FOMIM User’s Guide

CHAPTER 3

TESTING AND TROUBLESHOOTING

This chapter lists the installation checkout procedures necessary to verify
that the segments connected to your FOMIM are operating properly. The
chapter concludes with a description of the LANVIEW LEDs and their
use in troubleshooting physical layer network problems.

3.1 INSTALLATION T EST

This section contains procedures to test the following:

• The fiber optic link segment to be attached to the FOMIM

• The link between the FOMIM and the device attached to the other end

of the fiber optic link segment

• The FOMIM itself

3.1.1 Testing the Fiber Optic Link Segment

Test the segment being attached to the FOMIM to verify that the cable
meets the fiber budget specifications discussed in Appendix A. Using a
fiber optic power meter set, test the link segment as follows:

Do not touch the ends of the fiber optic strands, and do not let

!

CAUTION

1. Attach a fiber optic jumper to the optical power meter. The meter

should be set at 1300 nm.

2. Attach a fiber optic jumper to the optical source unit. If the source unit

has multiple settings, it should be set at 1300 nm.

3. Using a barrel connector, connect the jumpers together.

the ends come in contact with dust, dirt, or other contaminants.
Contamination of the ends can cause problems in data
transmissions. If the ends become contaminated, clean them
with denatured alcohol using a soft, clean, lint free cloth.

4. Following the instructions for the test set, test the jumpers to get a

reference level. Make a note of this reading.

FOMIM User’s Guide 3-1

Chapter 3: Testing and Troubleshooting

5. Disconnect the jumpers from the barrel connector.

6. Using the jumper, attach the optical power meter to one end of one
strand of the link segment.

7. Using the other jumper, attach the other end of the same strand to the
optical source unit.

8. Note the reading on the optical power meter. This is your test level.

9. Subtract the reference level found in Step 4 from the test level to find
your dB loss for the fiber optic link segment, i.e.,
dB loss = Test Level - Reference Level.

10. Verify that the reading on the receive unit falls within the range
indicated by the Receive Sensitivity and Maximum Receive Input
Power specifications listed in the Fiber Optic Interface section of
Appendix A.

11. Repeat Steps 6 through 10 for the other strand in the link segment.

If the fiber optic link segment does not meet the specifications, it may be
contaminated with dust, dirt, or other contaminants. Try cleaning the
connection at each end of the cable with denatured alcohol, using a soft,
clean, lint free cloth, then repeat the test.

If this does not work, contact Cabletron Systems technical support.

3.1.2 Link T est

To verify the physical link between your devices, check the LNK LEDs
on your FOMIM and receiving de vice for the applicable port. If the LEDs
are lit, the proper connection has been made.

If the LEDs are not lit, perform the following procedure, using a
Cabletron Systems FOT-F3 Fiber Optic T ranscei ver at the other end of the
cable.

1. Check that power is being supplied to both the FOMIM in the MMAC
chassis and the device at the other end of the link.

2. Reverse the fiber optic cable ends at either the applicable port on the
module or at the device.

3. Check if the LEDs are lit.

3-2 FOMIM User’s Guide

Pre-Installation T est

4. If the LEDs are not lit, reverse the cable ends back to their original

positions, and contact Cabletron Systems Technical Support for
assistance.

3.2 PRE-INSTALLATION T EST

Before installing the FOMIM in a live network, test the module in a
controlled situation to ensure that it is repeating packets. With the
FOMIM installed in an MMAC hub with a Repeater module (e.g., IRM3),
this test can be performed with two workstations (Figure 3-1) by
completing the following steps:

1. Install the FOMIM into an MMAC chassis with an IRM3.

The IRM3 must be installed in slot one of the MMAC chassis.

NOTE

2. Connect the first workstation to the IRM3 using either the AUI port,

(with a transceiver and an AUI cable), or to the fiber optic port, (with
fiber optic cable), depending on which is the active repeater port.

The AUI port is the default active repeater port on the IRM3. If

NOTE

you want to test the module using the fiber port, it must be
selected through Local Management. Refer to the Local
Management section of the IRM3 User’s Guide for more
information on selecting the active repeater port.

3. Connect the second workstation to the FOMIM, using the appropriate

transceivers and cable.

4. Set the first workstation as the file server and the second as the client

(refer to the workstation documentation for setting up the workstations
as file server and client). When the workstations are properly set up,
proceed to send packets between the workstations and verify that the
FOMIM is operating properly.

FOMIM User’s Guide 3-3

Chapter 3: Testing and Troubleshooting

A “ping” test will verify that the module is operating properly.

NOTE

However, both server and client workstations must have their
own unique IP Addresses.

If failures occur, refer to Section 3.3, Using LANVIEW, in this chapter.

MMAC-M3FNB with IRM3

File Server Workstation

0494109

Client Workstation

Figure 3-1 Pre-Installation Test

3.3 USING LANVIEW

The FOMIM uses Cabletron Systems built-in visual diagnostic and status
monitoring system called LANVIEW. With LANVIEW, network
troubleshooting personnel can quickly scan LEDs to observe network
status, or diagnose network problems. Figure 1-2 in Chapter 1 shows the
location of the LANVIEW LEDs.

3-4 FOMIM User’s Guide

Table 3-1 LANVIEW Troubleshooting

Led Color Description

Using LANVIEW

Error
Condition/Recommended
Action

LNK
(Link/
Fiber
Port)

RCV
(Receive)

CLN
(Collision
Present)

Green When on, a link is

established
between the
FOMIM Fiber port
and the fiber device
at the other end of
the segment. LED is
on as long as the
link is maintained.

Yellow When flashing the

FOMIM is receiving
data packets from
segments connected
to the associated
port.

Red When flashing, a

collision is being
detected on one or
more segments
connected to the
MMAC. Note that
periodic flashing is
normal.

If off, the link between the port
and fiber device has been
broken.

Check the connectors at each
end of the segment to ensure
that they are free of dust. Clean
the connectors if necessary.
Reconnect the segment and
check the Link LED again.

If off, the FOMIM is not
receiving packets.

Check that the module is firmly
installed in the MMAC.

Excessive flashing or on solid
indicates excessive collisions.

ERR
(Error)

Red Remains lit when the

If you are not able to resolve a problem with your FOMIM, call Cabletron
Systems Technical Support for assistance (see Chapter 1, Section 1.6,
Getting Help).

FOMIM User’s Guide 3-5

temperature within
the MMAC chassis
rises above 40°C.

Chapter 3: Testing and Troubleshooting

3-6 FOMIM User’s Guide

APPENDIX A

FOMIM SPECIFICATIONS

The operating specifications for the Cabletron Systems FOMIM are
included in this Appendix. Cabletron Systems reserves the right to change
these specifications at any time without notice.

A.1 OPERATING SPECIFICATIONS

Table A-1 Fiber Optic Interface (All Ports)
Transceiver Built-In Cabletron Systems FOT-F3
Parameter Typical Minimum Maximum

Receive Sensitivity -31.0 dBm -36.0 dBm -30.0 dBm
Max. Receive Input

Power
Transmitter Power at

25°C Into 8.3/125 µm
fiber:

Output Power
Coefficient

Transmitter Power decreases as temperatures rise and

NOTE

increases as temperatures fall. Use the Output Power
Coefficient to calculate increased or decreased power output
for your operating environment. For example, the typical power
output at 25° C is -16.4 dBm. For a 4° C temperature increase,
multiply the typical coefficient (-0.07 dB) by four and add the
result to the typical output power (4°C x -0.07 dB/°C) +
(-16.4dBm) = -16.7).

-14.0 dBm

-18.0 dBm -21.0 dBm -15.0 dBm

-0.07 dB/°C

FOMIM User’s Guide A-1

Appendix A: FOMIM Specifications

Table A-2 Fiber Optic Interface (All Ports)

Parameter Typical Minimum Maximum

Transmitter
Peak W a ve
Length

Spectral Width 95 nm 125 nm
Rise Time 3.0 ns 2.7 ns 5.0 ns
Fall Time 2.5 ns 2.2 ns 5.0 ns
Duty Cycle 50.1% 49.6% 50.7%

1310 nm 1265 nm 1380 nm

Bit Error Rate Better than 10

-10

The transmitter power levels given above are Peak Power

NOTES

Levels after optical overshoot. You must use a Peak Power
Meter to correctly compare the values given above to those
measured on any particular port.

If you are measuring power levels with an Average Power
Meter, add 3 dBm to the average power measurement to
compare the measured average power values to the values
listed above (i.e ., -33.5 dBm average + 3 dB = -30.5 dBm peak).

A.2 ENVIRONMENTAL REQUIREMENTS

Operating Temperature: +5° to +40°C (41° to 104°F)
Non-operating Temperature: -30° to +80°C (-22° to 176°F)
Operating Humidity: 5% to 95% (non-condensing)

A-2 FOMIM User’s Guide

Agency Approvals

A.3 AGENCY APPROVALS

Designed in accordance with UL478, UL910, NEC 725-2(b), CSA, IEC,
TUV, VDE Class A. Meets FCC Part 15, Class A limits.

It is the responsibility of the person who sells the system of
which the FOMIM will be a part to ensure that the total system
meets allowed limits of conducted and radiated emissions.

PHYSICAL PROPERTIES

Dimensions: 34.04 D x 29.21 H x 5.08 W cm

(13.4 D x 11.5 H x 2.0 W in)

Weight: FOMIM-36: 0.57 kg (1.25 lb)

FOMIM-32: 0.86 kg (1.90 lb)
FOMIM-38: 1.13 kg (2.50 lb)

FOMIM User’s Guide A-3

Appendix A: FOMIM Specifications

A-4 FOMIM User’s Guide

INDEX

C

Cable

connecting 2-4
distance 1-3

requirements 2-1
CLN LED 1-5
Conventions 1-3

D

Design guidelines 2-1

E

ERR LED 1-5

F

FOMIM

installing 2-3

specifications A-1

unpacking 2-2

S

ST connectors 2-5

T

Testing

pre-installation 3-3, 3-4

U

Using LANVIEW 3-4

H

Help 1-6

L

LANVIEW

location 1-4

troubleshooting 3-5
Link

testing 3-1
LNK LED 1-5

M

MMAC

description 1-3

R

RCV LED 1-5
Related manuals 1-5

FOMIM User’s Guide Index-1

Index

Index-2 FOMIM User’s Guide