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FOT-F3
FIBER OPTIC
TRANSCEIVER
USER’S MANUAL
CABLETRON SYSTEMS, P.O. BOX 5005, Rochester, NH 03867-0505
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FCC NOTICE
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 has been tested and found to comply with
the limits for a Class A digital device, pursuant to Part 15 of 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 at
his own expense 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 transceiver with respect to the antenna.
Move the transceiver away from the receiver.
Plug the Ethernet device into a different outlet so that the device
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.
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ii
CONTENTS
PAGE
CONTENTS
CHAPTER
CHAPTER 1 INTRODUCTION
1.1 Using This Manual ..................................................1-1
1.2 Getting Help ............................................................1-2
1.3 The FOT-F3 Fiber Optic Transceiver......................1-3
1.4 Related Manuals .....................................................1-8
CHAPTER 2 INSTALLATION REQUIREMENTS/
SPECIFICATIONS
2.1 Network Design Guidelines ....................................2-1
2.1.1 Fiber Optic Requirements .............................2-2
2.1.2 AUI Requirements ........................................2-3
2.2 Operating Specifications .........................................2-3
CHAPTER 3 INSTALLING THE FOT-F3
3.1 Unpacking the FOT-F3 ...........................................3-1
3.2 Connecting FOT-F3 to the Network ........................3-2
3.2.1 Setting the SQE Switch.................................3-2
3.2.2 Connecting the AUI Cable ............................3-4
3.2.3 Connecting the Fiber Optic Cable.................3-5
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iii
CONTENTS
CHAPTER 3 (Cont.)
3.3 Mounting the FOT-F3 .............................................3-8
3.4 Cable Support Installation .......................................3-9
CHAPTER 4 TESTING AND USING LANVIEW
4.1 Installation Checkout...............................................4-1
4.1.1 Testing the Fiber Optic Link Segment ..........4-2
4.1.2 Testing the FOT-F3
Fiber Optic Transceiver ................................4-3
4.2 Using LANVIEW......................................................4-6
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iv
INTRODUCTION
CHAPTER 1
INTRODUCTION
Welcome to Cabletron Systems’ FOT-F3 Fiber Optic
Transceiver User’s Manual. We have designed this
manual to serve as a simple installation and reference
guide for the Cabletron Systems FOT-F3 transceiver.
The FOT-F3 allows you to connect two Ethernet devices
using single mode fiber optic cable. The FOT-F3 uses the
same signaling protocols specified by FOIRL and is
completely IEEE 802.3 compatible at the AUI interface
(the AUI port connects the transceiver to a device or
workstation via an AUI cable).
You should read through this manual to gain a full
understanding of the FOT-F3 transceiver and its
capabilities.
1.1 USING THIS MANUAL
Chapter 1, Introduction, discusses the capabilities of
Cabletron Systems’ FOT-F3 Fiber Optic Transceiver. The
chapter concludes with a list of related manuals.
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INTRODUCTION
Chapter 2, Installation Requirements/Specifications,
contains a list of hardware, software, location and
environmental requirements that must be met before you
install the FOT-F3. A list of FOT-F3 specifications is also
provided.
Chapter 3, Installing the FOT-F3, contains steps for
unpacking the FOT-F3, setting the SQE switch,
connecting the transceiver to the network, connecting the
transceiver to an active Ethernet device, and, if desired,
mounting the transceiver with the Velcro mounts provided
with the unit.
Chapter 4, Testing and Troubleshooting, contains
procedures for verifying the proper installation of the
FOT-F3. It also describes LANVIEW LEDs and their
function.
You should have a general working knowledge of Ethernet
or IEEE 802.3 type data communications networks and
their physical layer components before installing the
FOT-F3.
1.2 GETTING HELP
If additional support is needed related to the Cabletron
Systems FOT-F3, or if you have any comments,
improvements, suggestions, or questions relating to this
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INTRODUCTION
manual, feel free to contact Cabletron Systems’ Technical
Support at:
Cabletron Systems
P.O. Box 5005
Rochester, NH 03867-0505
Phone: (603) 332-9400
1.3 THE FOT-F3 FIBER OPTIC TRANSCEIVER
Connections
The Cabletron Systems FOT-F3 Fiber Optic Transceiver
(Fiber Optic Medium Attachment Unit or FOMAU)
(Fig. 1-1) easily connects two active Ethernet devices
through a fiber optic link segment. Devices such as
repeaters, multiport repeaters, multiport transceivers or
host systems can be connected using fiber optic cable.
The FOT-F3 is fully compatible with IEEE 802.3 and uses
the same signaling specified in FOIRL specifications. It
provides the flexibility to connect to networks using
Ethernet Version 1, Version 2, and/or IEEE 802.3
equipment through an AUI port. However, the FOT-F3
uses 1300 nm wave-length optical transmitters and
receivers (not the 850 nm specified by FOIRL) and should
be used only with Cabletron Systems' Ethernet single
mode products such as the FOMIM-36, FOMIM-32, and
the FOMIM-38.
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INTRODUCTION
Figure 1-1. FOT-F3
A fiber optic cable is connected to the transceiver through
ST fiber optic ports on the FOT-F3. This provides an
optical link to connect the device to the network. The fiber
optic link segment can run from the FOT-F3 to any
Ethernet FOIRL compatible fiber optic device.
Distance and Cable Type
The FOT-F3 supports single mode fiber optic cable for
sizes such as 8.3/125 µm, 8.7/125 µm, 9/125 µm, and
10/125 µm. You can also use multi mode cable such as
62.5/125 µm, but signal distance will be much shorter.
The signal 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
over ten kilometers is possible with single mode cable. If
using 62.5/125 multi mode cable, signal distance will be
about 2 km.
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INTRODUCTION
An AUI cable, up to 50 meters long, is used to connect an
Ethernet device to the AUI port on the transceiver. The
AUI cable must meet specifications for either IEEE 802.3
or Ethernet Version 1 or Version 2.
Signal Quality Error (SQE) Test
The FOT-F3 has a Signal Quality Error (SQE) Test Enable
Switch that allows you to enable or disable the SQE
(“heartbeat”) test function. The SQE test allows the
transceiver to generate a signal to ensure that the collision
circuit and path are operational between the FOT-F3 and
the Ethernet device attached to the transceiver’s AUI port.
The SQE test signal is generated after the FOT-F3 has
transmitted a data packet. This signal is generated only
between the FOT-F3 and the device; it will not be
transmitted onto the network. The SQE Test must not be
used when the FOT-F3 is attached to a repeater or
Ethernet Version 1 equipment.
LANVIEW LEDs
The FOT-F3 incorporates Cabletron Systems’ LANVIEW
diagnostic and monitoring system. LANVIEW is a series
of LEDs incorporated into all Cabletron Systems’ products.
If a problem arises, troubleshooting of power failures,
collisions, cable faults, or many other problems can be
diagnosed rapidly using a series of LEDs.
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INTRODUCTION
Application
The FOT-F3 can be configured into your network in many
ways. For example, a fiber optic link segment (4, Fig. 1-2)
can be attached to a Cabletron Systems’ Multi Media
Access Center (MMAC ) (5) with a FOMIM-32/36/38.
The MMAC serves as an intelligent repeater hub that links
the fiber optic link segment to other network segments,
regardless of media type. The link segment is attached to
an FOT-F3 (3). An Ethernet device, such as a workstation
(1), is connected to the FOT-F3 through an AUI cable (2).
3
2
4
1
5
1. Workstation
2. AUI Cable
3. FOT-F3
4. Fiber Optic Link
5. MMAC with Fiber Optic MIM
Figure 1-2. FOT-F3 Setup, Example 1
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INTRODUCTION
In another example, an FOT-F3 (3, Fig. 1-3) is connected
to an MMAC (1) by an AUI cable (2) attached to an
Intelligent Repeater Module (IRM ) in the MMAC. A
lengthy fiber optic link segment (4), up to ten kilometers,
runs from the FOT-F3 and to a Cabletron Systems’
NB25 bridge (7). Through the bridge, the host device
communicates with other devices on a larger Ethernet
network attached to the bridge’s AUI port.
4
5
6
7
1
3
2
1. MMAC
2. AUI Cable
3. FOT-F3
4. Fiber Optic Link
5. FOT-F3
6. AUI Cable
7. NB25 Bridge
Figure 1-3. FOT-F3 Setup, Example 2
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INTRODUCTION
1.4 RELATED MANUALS
The manuals identified below should be used to
supplement the procedures and other technical data
provided in this manual. The procedures contained in the
manuals below will be referenced only.
Cabletron Systems’ LAN-MD Portable Ethernet Tester
User’s Manual.
Cabletron Systems' FOMIM-32/36/38 Fiber Optic Interface
Module Installation Guide.
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REQUIREMENTS/SPECS.
CHAPTER 2
INSTALLATION REQUIREMENTS/
SPECIFICATIONS
Before you attempt to install Cabletron Systems’ FOT-F3
Fiber Optic Transceiver, review the network design
guidelines outlined in this chapter. In addition, you should
review the operating specifications and environmental
requirements which are also listed.
All conditions, guidelines, specifications, and requirements
included in this chapter must be met to ensure satisfactory
performance of the FOT-F3. Failure to follow these
guidelines may result in unsatisfactory network
performance.
2.1 NETWORK DESIGN GUIDELINES
The following design guidelines must be met when
connecting devices using the FOT-F3 Fiber Optic
Transceiver.
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REQUIREMENTS/SPECS.
2.1.1 Fiber Optic Requirements
•
•
•
The fiber optic link segments should consist of
single mode 8/125 - 12/125 µm fiber optic cabling.
You can also use multi mode 62.5/125 µm fiber optic
cabling, but signal distance will be much shorter
(about 2 km).
The link segment must be tested with a fiber optic
attenuation test set that is adjusted for a 1300 nm
wavelength. This test verifies that the signal loss in a
cable is within an acceptable level of -10.0 dB or less
for any given single mode fiber optic link.
When determining the maximum fiber optic cable
length, the fiber optic budget and total network
propagation delay should be calculated and taken into
consideration before fiber runs are incorporated in
any network design. Fiber optic budget is the
combination of the optical loss due to the fiber optic
cable, in-line splices, and fiber optic connectors.
Propagation delay is the amount of time it takes a
packet to travel from the sending device to the
receiving device. If the total propagation delay
between any two nodes anywhere on the network
exceeds 25.6 µs, then you should use bridges.
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REQUIREMENTS/SPECS.
2.1.2 AUI Requirements
•
The AUI cable connecting the transceiver to a device
must be Ethernet Version 1, Version 2, and/or IEEE
802.3 type cables that match the type of device being
attached to the AUI port.
•
The AUI cable must not exceed 50 meters (164 feet)
in length. If 28 AWG AUI cable is used, then the
maximum cable length is limited to 16 meters
(50 feet).
2.2 OPERATING SPECIFICATIONS
This section contains the specifications, power supply
requirements and environmental guidelines for Cabletron
Systems’ FOT-F3. Cabletron Systems reserves the right
to change these specifications at any time without notice.
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REQUIREMENTS/SPECS.
FIBER OPTIC INTERFACE
Type:
FOT-F3:
ST fiber optic ports.
Minimum Maximum
Parameter
Typical
Receive
-31.0 dBm -33.5 dBm -29.5 dBm
Sensitivity:
Max. Receive
Input Power:
-7.5 dBm
-9.72 dBm -6.99 dBm
Transmitter Power
at 25° C
Into 8.3/125
µm fiber:
-15.0 dBm -19.5 dBm -12.0 dBm
Output Power
Coefficient:
-0.15
dBm/°C
-0.12
dBm/°C
-0.18
dBm/°C
NOTE: 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 (-0.15 dBm) by four and add the result to typical
output power (4 x -0.15 dBm + -16.4 = -17.0).
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REQUIREMENTS/SPECS.
FIBER OPTIC INTERFACE (cont.)
Transmitter Peak 1300 nm
Wave Length
1270 nm
-
1330 nm
100 nm
Spectral Width 60 nm
Rise Time/
Fall Time
3.0 nsec
2.5 nsec
2.7 nsec
2.2 nsec
5.0 nsec
5.0 nsec
Duty Cycle
50.1%
49.6%
50.7%
Bit Error Rate: Better than 10-10 bit error rate
NOTE: The transmitter power levels and receive
sensitivity 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.
If you are measuring power levels with an Average Power
Meter, add 3 dBm to the measurement to correctly
compare those measured values to the values listed
above (i.e. -30.5 dBm peak = -33.5 dBm average).
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REQUIREMENTS/SPECS.
AUI CONNECTOR
Type:
15 position D type receptacle (Fig. 2-1)
Pin 1 Logic Ref.
Pin 9
Collision -
2
3
4
5
6
7
8
Collision +
Transmit +
Logic Ref.
10 Transmit -
11 Logic Ref.
12 Receive -
13 Power (+12 Vdc)
14 Logic Ref.
Receive +
Power Return
No Connection
Logic Ref.
15 No Connection
Shell:
Cable Shield and FOT-F3 Case
1
8
9
15
Figure 2-1. AUI Pin Connections
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REQUIREMENTS/SPECS.
INDICATORS
NOTE: The FOT-F3 has six LEDs (Fig. 2-2), which are
explained in detail in Chapter 4, Testing and
LANVIEW.
PWR (Power)
When lit, this LED indicates that the FOT-F3 is receiving
power (green indicator).
SQE (Signal test Quality Error)
When lit, this LED indicates that SQE is enabled (yellow
indicator).
Figure 2-2. LANVIEW LEDs
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REQUIREMENTS/SPECS.
INDICATORS (cont.)
XMT (Transmit)
This LED flashes to indicate that the FOT-F3 is
transmitting packets onto the network (green indicator).
RCV (Receive)
This LED flashes to indicate that the FOT-F3 is
receiving data packets from the network (yellow
indicator).
CLN (Collision)
This LED flashes to indicate that the FOT-F3 is
detecting a collision on the network (red indicator).
LNK (Link OK)
When lit, this LED indicates that a link has been
established between the FOT-F3 and the device at the
other end of the fiber optic link segment (green
indicator).
POWER SUPPLY
Parameter
Typical
Value
Worst
Case
Current:
Input Voltage:
Reset Time:
425 mA
9.0 V
500 ms
475 mA
7.5 - 15.75V
750 ms
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REQUIREMENTS/SPECS.
ENVIRONMENTAL
Operating Temperature: 5° to 55°C
Operating Humidity: 5 to 95% (non-condensing)
SAFETY
Designed in accordance with UL478, UL910, NEC
725-2(b), CSA, IEC, TUV, VDE class A. Meets FCC,
Part 15, Class A limits.
WARNING: It is the responsibility of the person who
sells the system of which the FOT-F3 will be a part to
ensure that the total system meets allowed limits of
conducted and radiated emissions.
PHYSICAL
Dimensions:
Weight:
3.25 H x 6 W x 0.88 D inches
(8.3 x 15.2 x 2.2 cm)
7.2 oz. (205 g)
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INSTALLATION
CHAPTER 3
INSTALLING THE FOT-F3
This chapter contains instructions for unpacking your
Cabletron Systems’ FOT-F3 Transceiver, connecting the
FOT-F3 to an Ethernet device and the network, installing
cable supports, and mounting the transceiver (if
necessary). Verify that all requirements listed in Chapter
2, Installation Requirements/Specifications, are met
before installing the transceiver.
3.1 UNPACKING THE FOT-F3
Before you install the FOT-F3, you should visually inspect
the transceiver and check the contents of the accessory
package. To unpack the transceiver:
1. Carefully remove the transceiver from the shipping
box. Save the shipping box and materials in the
event the transceiver has to be reshipped.
2. Remove the transceiver from its protective plastic bag
and set the transceiver aside.
3. Remove the accessory package from the box. It
should contain:
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INSTALLATION
• One set of Velcro mounts
• Two cable mounts (for strain relief)
• Two cable ties (0.1 x 4 inches).
If you notice any discrepancies, contact Cabletron
Systems’ Technical Support immediately.
3.2 CONNECTING THE FOT-F3 TO THE NETWORK
After you are sure that you have met all the requirements
listed in Chapter 2, Installation Requirements/
Specifications, complete the installation instructions
listed in this section.
NOTE: Ensure that the site where the FOT-F3 will be
located will allow the AUI cable and the fiber optic link
segment to be easily connected to the transceiver before
you begin the installation procedures.
3.2.1 Setting the SQE Switch
The Signal Quality Error (SQE) Test Switch allows you to
enable or disable the SQE (“heartbeat”) test function. The
SQE switch is the two position switch on the right side of
the FOT-F3, located above the fiber optic ports. See
Figure 3-1. The SQE test function is disabled when the
transceiver is shipped.
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INSTALLATION
NOTE: The SQE test function must be disabled if you
are connecting the transceiver to Ethernet Version 1
equipment or to a repeater.
Set the SQE Switch as follows:
•
To disable the SQE test function, set the switch
(Fig. 3-1) towards the optical ports to the off (o)
setting.
•
To enable the SQE test function, set the switch
(Fig. 3-1) away from the optical ports to the on (•)
setting on the label.
Figure 3-1. SQE Switch
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INSTALLATION
3.2.2 Connecting the AUI Cable
To connect your Ethernet device to the FOT-F3, attach an
AUI cable as follows. See Figure 3-2.
1. Attach an AUI cable to the device to which the
FOT-F3 will be connected.
2. Attach the female connector on the AUI cable to the
AUI port on the FOT-F3. If the power is on for the
Ethernet device, the PWR LED should be lit,
indicating the transceiver is receiving power from the
device. Also, the SQE LED should be lit, if the SQE
test is enabled.
Slide Latch
AUI Port
A
U
I
Figure 3-2. AUI Connection
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INSTALLATION
If the PWR LED is not lit, perform the following steps:
a. Verify that the power is turned on for the device
attached to the FOT-F3.
b. Disconnect the AUI from the FOT-F3.
c. Disconnect the device to which the transceiver is
attached.
d. Check the AUI connections for proper pinouts.
The pinouts for the transceiver connection are
listed in Chapter 2.
e. Check the cable for continuity.
f. Reconnect the AUI cable to the FOT-F3 and
the device.
3. Move the slide lock on the AUI connector to secure it
to the lock posts on the port.
3.2.3 Connecting the Fiber Optic Cable
This section describes how to connect the fiber optic link
segment to the FOT-F3. Perform the following steps only
after testing the fiber optic cable to ensure that the cable
has no defects.
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INSTALLATION
NOTE: We recommend labeling the fiber optic cable to
indicate which fiber is Receive and which is Transmit.
When you buy fiber optic cable from Cabletron Systems,
at one end of the cable, one fiber is labeled 1, and the
other fiber is labeled 2. This pattern is repeated at the
other end of the cable. If you did not purchase your cable
from Cabletron Systems, then be sure you have labeled
your cable in the manner described above.
ST connectors attach to ST ports much like BNC
connectors attach to BNC ports. See Figure 3-3. The
connector is inserted into the port with an alignment key
on the connector inserted into the alignment slot on the
port. The connector is then turned to lock it down.
NOTE: Do not touch the ends of the fiber optic strands
and do not let ends come in contact with contaminants.
Contamination of the ends can cause problems in data
transmissions. If the ends become contaminated, clean
them with a soft, clean, lint-free cloth and alcohol.
Connect the fiber optic cable to the FOT-F3 as follows:
1. Remove the protective plastic covers from the fiber
optic ports on the FOT-F3 and the ends of the
connectors on each fiber strand. Save the covers and
replace them on the connectors and ports whenever
the fiber optic strands are removed from the FOT-F3.
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INSTALLATION
ST Fiber Optic
Ports
ST
Connectors
Figure 3-3. ST Connectors
2. Attach the fiber labeled 1 to the bottom port, labeled
RX on the FOT-F3.
3. Attach the fiber labeled 2 to the top port, labeled TX.
4. At the other end of the fiber optic cable, attach the
fiber labeled 1 to the transmit port of the device.
5.
Attach the fiber labeled 2 to the receive port.
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INSTALLATION
6. Check that the LNK LED on the FOT-F3 is lit. If the
LED is not lit, perform each of the following steps until
the LED is lit:
a. Check that the power is on for the device at the
other end of the link.
b. Verify that the fiber strands are properly
connected to each port.
c. Reverse the fiber optic cable ends at one end of
the fiber optic link segment.
If a link has not been established, contact Cabletron
Systems’ Technical Support.
3.3 MOUNTING THE FOT-F3
Using the contents of the accessory package, you can
mount the FOT-F3 on a surface close to the workstation or
on the workstation itself.
The surface you choose should meet the following
requirements:
•
Allows the fiber optic segment to be easily connected
to the transceiver.
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Page 3 - 8
INSTALLATION
•
•
Allows the AUI cable to be easily connected from the
transceiver to the workstation.
Has a smooth, dirt-free surface which will easily
accept the adhesive bonds.
Mount the FOT-F3 as follows:
1. Separate the two 1.5" x 3" Velcro mounts.
2. Peel off the paper that covers the adhesive backing of
one Velcro mount.
3. Carefully position the Velcro on the back of the
FOT-F3. Be sure to press firmly so that the adhesive
firmly affixes.
4. Similarly, place the other half of Velcro on the surface
on which you want to mount the FOT-F3.
5. Attach the FOT-F3 to the Velcro mount.
3.4 CABLE SUPPORT INSTALLATION
Some attempt should be made to strain relief the cables
attached to the FOT-F3, whether or not the transceiver is
mounted.
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INSTALLATION
NOTE: Be sure each cable is securely attached to its port
and that the slide latch on the AUI connector is secured to
the lock posts on the AUI port. See Figure 3-2.
To strain relief the cables for a wall-mounted FOT-F3
(Fig. 3-4):
1. Remove protective paper from one of the cable
mounts and attach the mount to the wall 3 inches
from the FOT-F3 fiber optic ports.
2. Repeat step 1 placing the other cable mount four
inches from the AUI port.
3. Strain relief each cable to its respective cable mount
by using the tie wraps.
To strain relief the cables for a FOT-F3 that is not wall-
mounted:
1. If possible, use long tie wraps to secure the FOT-F3
to a structural item such as a beam or a rafter.
2. Using additional long tie wraps, strain relief each
cable to the same structural item.
The FOT-F3 is now ready for operation. We recommend
that you test the system prior to transmitting data. Refer
to Chapter 4, Testing And Troubleshooting.
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Page 3 - 10
INSTALLATION
DEVICE
Tie Wraps
FOT-F3
Cable Mounts
Fiber Optic
Segment
AUI Cable
Figure 3-4. Mounting the FOT-F3
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TESTING AND TROUBLESHOOTING
CHAPTER 4
TESTING AND TROUBLESHOOTING
This chapter lists procedures to test the FOT-F3 Fiber
Optic Transceiver after it has been connected to the
network. A description of LANVIEW and its function in
troubleshooting physical layer network problems are also
given.
4.1 INSTALLATION CHECK-OUT
This section contains procedures to test:
•
•
The fiber optic link segment to be attached to the
FOT-F3.
The FOT-F3 after it has been installed to ensure that
the physical layer of the network is operating properly.
Two Ethernet node testers capable of generating valid
data packets,such as the LAN-MD, are required for
this procedure.
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TESTING AND TROUBLESHOOTING
4.1.1 Testing the Fiber Optic Link Segment
Test the segment being attached to the FOT-F3 to verify
that the cable meets the fiber budget specifications
discussed in Chapter 2. Using a fiber optic power meter
set, test your link segment as follows:
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.
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.
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TESTING AND TROUBLESHOOTING
8. Take note of the reading on the optical power meter.
This isyour 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 matches the
specifications listed in the Fiber Optic Interface
section of Chapter 2.
11. Repeat steps 6-10 for the other strand in the link
segment.
If the fiber optic link segment does not meet the
specifications, try cleaning the connection at each end of
the cable with a soft, clean, lint-free cloth with alcohol,
then repeat the test.
4.1.2 Testing the FOT-F3 Fiber Optic Transceiver
1. Using an AUI cable (2, Fig. 4-1), connect a LAN-MD
(1) to the FOT-F3 (3).
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TESTING AND TROUBLESHOOTING
1. LAN-MD
5. FOT-F3
2. AUI Cable
3. FOT-F3
6. AUI Cable
7. LAN-MD
4. Fiber Optic Segment
Figure 4-1. Installation Checkout
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TESTING AND TROUBLESHOOTING
2. Using another AUI cable (6), connect the other
LAN-MD (7) to another FOT-F3 (5) attached to the
same fiber optic link segment as the FOT-F3.
3. Select and run test 6 - SERVER on the LAN-MD
connected in step 1. Verify that this test passes.
•
The status on the LAN-MD should read 000 if
SQE is enabled or 001 if SQE is disabled. A
PASS TEST STATUS LED should also be lit on
the LAN-MD.
•
This LAN-MD now acts as the SERVER unit and
will act as a packet echoer when used with
another LAN-MD.
4. Select and run test 4 - NODE on the LAN-MD
connected in step 2.
Verify that this test passes. At least 100 packets
should be sent and received with no errors. The
packets will be received and sent back from the
SERVER LAN-MD that was left running on the other
segment.
When the FOT-F3 has successfully completed this test,
the units are ready for normal operation. If any failures are
noted, please contact Cabletron Systems’ Technical
Support.
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TESTING AND TROUBLESHOOTING
4.2 USING LANVIEW
The FOT-F3 Fiber Optic Transceiver uses Cabletron
Systems’ LANVIEW, a built-in visual diagnostic and status
monitoring system. LANVIEW LEDs are more effective
than a network monitor because a network troubleshooter
can quickly scan the LEDs to diagnose network problems
and to determine which node or segment is faulty.
The following discusses the function and purpose of each
LANVIEW LED on the FOT-F3 Fiber Optic Transceiver.
See Figure 4-2.
Optical Link OK (LNK) LED
When lit, this green LED indicates that a link has been
established between the receive circuitry of the FOT-F3
and the transmit circuitry of the fiber optic device at the
other end of the fiber optic link segment. This LED
remains lit as long as the link is maintained.
To ensure that a link is maintained, the transceiver
generates a 1 MHz idle signal when it is not transmitting
data.
Collision (CLN) LED
This red LED flashes to indicate that the FOT-F3 is
detecting a collision condition. The frequency of flashes
increases as the network activity increases since more
collisions are likely to occur. The flash of the LED is
pulse-stretched for viewing effect.
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TESTING AND TROUBLESHOOTING
LNK
CLN
RCV
XMT
SQE
PWR
SQE
TX
1300nm
RX
Figure 4-2. LANVIEW LEDs
Receive (RCV) LED
This yellow LED flashes to indicate that the transceiver is
receiving a data packet from the network. The flash of the
LED is pulse stretched for viewing effect.
The LED will flash when traffic is on the network, even if
the data is not intended for the device attached to the
FOT-F3.
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TESTING AND TROUBLESHOOTING
Transmit (XMT) LED
This green LED flashes to indicate that a data packet is
being transmitted onto the network by the device
connected to the transceiver. The flash of the LED is
pulse-stretched for viewing effect.
This LED stays off if the device is active, but not
transmitting traffic onto the network.
Signal Quality Error Test Function (SQE) LED
When lit, this yellow LED indicates the SQE test function is
enabled in the transceiver. When the LED is not lit, this
indicates that the SQE test is not enabled.
The SQE test is used to ensure that the collision presence
circuit and path are operational between the FOT-F3 and
the Ethernet device attached to the AUI port. This test is
generated by the transceiver after a data packet has been
transmitted through the transceiver.
Power (PWR) LED
When lit, this green LED indicates that the transceiver is
receiving power from the device connected to it.
If this LED is not lit, power is not being received from the
device or the DC-to-DC converter in the transceiver has
failed.
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