Operating Specifications
General
Receive Sensitivity:
-31.5 dbm typical; -29.5 dbm worst case
Max. Receive Input Power:
-7.6 dbm typical; -8.2 dbm worst case
Bit Error Rate: Better than 10-10 error rate
Transmitter Peak Wavelength:
820 nm typical; 790 nm min.; 860 nm max.
Spectral Width: 75 nm max.
Rise Time: 10 nsec max.
Fall Time: 10 nsec max.
Transmitter Power
Into 50/125
µ
m fiber:
-13.0 dbm typical; -15.0 dbm worst case
17.5 db typical budget; 13.0 db worst case budget
Into 62.5/125
µ
m fiber:
-10.0 dbm typical; -12.0 dbm worst case
20.5 db typical budget; 16.0 db worst case budget
Into 100/140
µ
m fiber:
-7.0 dbm typical; -9.0 dbm worst case
23.5 db typical budget; 19.0 db worst case budget
Note:
All transmitter readings are peak power.
AUI 15 Pin D-Type Connector
Power Supply
Current: 280 mA typical; 500mA worst case
Input Voltage: 12.0 Vdc typical; 9.0 Vdc min.;
15.75 Vdc max.
Environmental
Operating temperature: 0 to 55
°
C (131
°
F)
Note:
The transceiver case serves as a heat sink. It is
normal for the case to feel extremely warm.
Operating Humidity: 5 to 95% (non-condensing)
Safety
Designed in accordance with UL478, UL910, NEC
725-2(b), CSA, IEC, TUV, VDE Class B. Meets FCC
Part 15, Class B limits.
Note:
It is the responsibility of the person who sells the
system to which the FOT-F will be a part to ensure that
the total system meets allowed limits of conducted and
radiated emissions.
Installation
To install your FOT-F, set the transceiver’s SQE
switch, connect the AUI cable to an Ethernet device,
cquirements listed previously in this guide, and the
guidelines listed in the following sections.
Setting the SQE Switch
The SQE switch is a two position switch on the top of
the transceiver. The FOT-F is shipped with the SQE
switch in the on position (O). To disable the SQE test
function, slide the SQE switch toward the off position
(O), as indicated on the front of the transceiver.
Caution:
You must disable the SQE test function if you
connect the FOT-F to a repeater or to an Ethernet Ver-
sion 1 device. In addition, some Version 2 equipment
does not support SQE Test. Devices that do not sup-
port the SQE Test function will interpret the SQE test
pulse as a collision, which will cause poor network per-
formance.
Connecting the FOT-F to the Network
1. Remove the plastic covers from the fiber optic ports
on the FOT-F and from the ends of the connectors
on each fiber cable.
2. Being careful not to touch the ends of the connec-
tors, attach a fiber cable from the transceiver TX
port, to the RX port on the network device. Like-
wise, attach a fiber cable from the RX port on the
transceiver, to the TX port on the network device
.
Caution:
If you have SMA 906 connectors, make sure
that each connector has a half alignment sleeve in
place. A full alignment sleeve will damage the trans-
ceiver port.
3. Attach the FOT-F AUI cable to the Ethernet device.
4. Check the LANVIEW® LEDs. The PWR LED should
be lit to indicate that the transceiver is receiving
power through the AUI cable. The LNK LED should
be lit to indicate that you have a link between the
transceiver and the network device. The SQE LED
will be lit if you have the SQE test function enabled.
Using LANVIEW
The FOT-F uses Cabletron Systems’ built-in diagnostic
and status monitoring system, LANVIEW. The LAN-
VIEW LEDs give you a visual indication of network ac-
tivity and can help isolate problems.
Power (PWR) LED
When lit, this green LED indicates that the FOT-F is re-
ceiving power though its AUI connector. If the PWR
LED is not lit, power is not being received or the DC-to-
DC converter in the transceiver has failed.
Signal Quality Error (SQE) Test Function LED
When lit, this yellow LED indicates that the trans-ceiv-
er’s SQE test function is on. The SQE test is used to
ensure that the collision presence circuit and the path
between the Ethernet device and the transceiver are
operational. This test is generated by the transceiver
after a data packet has been transmitted through the
transceiver.
O
O
O
O
O
O
O
O
O
O
O
O
O
O
O
8 Logic Ref
7 No Connection
6 Power Return
5 R
4 Logic Ref.
3 Tr
2 Col
1 Logic Ref.
15 No Connection
14 Logic Ref.
13 Power (+12Vdc)
12 Receive -
11 Logic Ref.
10 Transmit -
9 Collision -
SMA 905 Connector
SMA 906 connector with
Half Alignment sleeve
ST Connector
SN
SQE
TX
RX
FOT-F24
S
Q
E
X
M
T
R
C
V
C
L
N
L
N
K
P
W
R
802.3 10BASE-FL/FOIRL
TRANSCEIVER
WITH
LANVIEW
®
b
