FOMIM-32/36/38 FIBER OPTIC
MEDIA INTERFACE MODULE
USER’S GUIDE
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Consequently, when used in a residential area or in an adjacent area thereto, radio interference may be
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DECLARATION OF CONFORMITY
Application of Council Directive(s): 89/336/EEC
73/23/EEC
Manufacturer’s Name: Cabletron Systems, Inc.
Manufacturer’s Address: 35 Industrial Way
PO Box 5005
Rochester, NH 03867
European Representative Name: Mr. J. Solari
European Representative Address: Cabletron Systems Limited
Nexus House, Newbury Business Park
London Road, Newbury
Berkshire RG13 2PZ, England
Conformance to Directive(s)/Product Standards: EC Directive 89/336/EEC
EC Directive 73/23/EEC
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We the undersigned, hereby declare that the equipment packaged with this notice conforms to
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Manufacturer
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Mr. Richard Michaud
Mr. J. Solari
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Rochester, NH, USA
Newbury, Berkshire, England
___________________________________
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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
INDEX
FOMIM SPECIFICATIONS
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Contents
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CHAPTER 1
INTRODUCTION
Welcome to the Cabletron Systems FOMIM-32/36/38 Fiber Optic
Media Interface Module User’s Guide. We have designed this manual
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
1.1
USING THIS MANUAL
Chapter 1, Introduction, discusses the capabilities and special features of
the Cabletron Systems FOMIMs (Figure 1-1). This chapter also includes
a list of related manuals.
Chapter 2, Network Requirements and Installation, contains a list of
network requirements that must be met before you install the FOMIM and
instructions for installing the FOMIM into the MMAC chassis.
Chapter 3, Testing and Troubleshooting, provides procedures for testing
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, FOMIM Specifications, contains operational specifications
and environmental requirements for the FOMIM.
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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
information that may be of special importance.
NOTE
Caution symbol. Contains information essential to avoid
damage to the equipment.
!
CAUTION
Warning symbol. Warns against an action that could result in
equipment damage, personal injury or death.
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
and receivers (not the 850 nm specified by FOIRL) and should
NOTE
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
8.3/125 µm, 8.7/125 µm, 9/125 µm, 10/125 µm, and 12/125 µm. The
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 µm
multimode cable with the FOMIM, but due to greater optical loss, signal
distance is reduced to 2 km.
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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
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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.
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Chapter 1: Introduction
Error (ERR) LED
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 Multi Media Access Center (MMAC-M3FNB,
MMAC-M5FNB, and MMAC-M8FNB) Overview and Set Up Guides.
Cabletron Systems 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
(603) 332-9400
Monday – Friday; 8 A.M. – 8 P.M. Eastern Time
GO CTRON from any ! prompt
ctron.com (134.141.197.25)
anonymous
By CompuServe
By Internet mail
By FTP
Login
Password
your email address
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)
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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
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Chapter 1: Introduction
1-8
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CHAPTER 2
NETWORK REQUIREMENTS AND
INSTALLATION
This chapter begins with network design guidelines in Section 2.1,
Network Cable Requirements, that must be met before installing the
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.
2.1.1
Fiber Optic Network Design Guidelines
•
•
•
The fiber optic link segment should consist of 8/125 – 12/125 µm
single mode fiber optic cabling. You can also use 62.5/125 µm
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).
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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
allowed for the entire network is 25.6 µs. 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
electrostatic precautions while handling the FOMIM.
!
CAUTION
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
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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 for a management module
(e.g., IRM3) only.
NOTE
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
Figure 2-1 Installing the FOMIM
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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
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.
!
CAUTION
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.
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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 following 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.
Verify proper cross-over of the fiber strands. Try swapping 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.
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Chapter 2: Network Requirements and Installation
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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 TEST
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
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.
!
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.
4. Following the instructions for the test set, test the jumpers to get a
reference level. Make a note of this reading.
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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 Test
To verify the physical link between your devices, check the LNK LEDs
on your FOMIM and receiving device 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 Transceiver 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.
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Pre-Installation Test
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 TEST
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
you want to test the module using the fiber port, it must be
NOTE
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.
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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.
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Using LANVIEW
Table 3-1 LANVIEW Troubleshooting
Error
Led
Color
Description
Condition/Recommended
Action
LNK
Green
When on, a link is
established
between the
If off, the link between the port
and fiber device has been
broken.
(Link/
Fiber
Port)
FOMIM Fiber port
and the fiber device Check the connectors at each
at the other end of end of the segment to ensure
the segment. LED is that they are free of dust. Clean
on as long as the
link is maintained.
the connectors if necessary.
Reconnect the segment and
check the Link LED again.
RCV
(Receive)
Yellow
Red
When flashing the
FOMIM is receiving receiving packets.
data packets from
segmentsconnected Check that the module is firmly
to the associated
port.
If off, the FOMIM is not
installed in the MMAC.
CLN
(Collision
Present)
When flashing, a
collision is being
detected on one or
more segments
connected to the
MMAC. Note that
periodic flashing is
normal.
Excessive flashing or on solid
indicates excessive collisions.
ERR
(Error)
Red
Remains lit when the
temperature within
the MMAC chassis
rises above 40°C.
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).
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Chapter 3: Testing and Troubleshooting
3-6
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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
-14.0 dBm
-15.0 dBm
Transmitter Power at
25°C Into 8.3/125 µm
fiber:
-18.0 dBm
-21.0 dBm
Output Power
Coefficient
-0.07 dB/°C
Transmitter Power decreases as temperatures rise and
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).
NOTE
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Appendix A: FOMIM Specifications
Table A-2 Fiber Optic Interface (All Ports)
Parameter
Typical
Minimum
Maximum
Transmitter
Peak Wave
Length
1310 nm
1265 nm
1380 nm
Spectral Width
Rise Time
95 nm
125 nm
5.0 ns
5.0 ns
50.7%
3.0 ns
2.7 ns
2.2 ns
49.6%
Fall Time
2.5 ns
Duty Cycle
Bit Error Rate
50.1%
Better than 10-10
The transmitter power levels given above are Peak Power
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.
NOTES
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:
Non-operating Temperature:
Operating Humidity:
+5° to +40°C (41° to 104°F)
-30° to +80°C (-22° to 176°F)
5% to 95% (non-condensing)
A-2
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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)
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Appendix A: FOMIM Specifications
A-4
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INDEX
C
Cable
S
ST connectors 2-5
connecting 2-4
distance 1-3
requirements 2-1
CLN LED 1-5
Conventions 1-3
T
Testing
pre-installation 3-3, 3-4
U
D
Using LANVIEW 3-4
Design guidelines 2-1
E
ERR LED 1-5
F
FOMIM
installing 2-3
specifications A-1
unpacking 2-2
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
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Index
Index-2
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