AUI Cable
The AUI port connects the Transceiver to an Ethernet
device. The cable can be up to 50 meters long and
must comply with IEEE 802.3 or with Ethernet Version
1 or 2 specifications.
Fiber Optic Cable Link Attenuation
At an 850 nm wave length, link segment attenuation
can be no more than:
• 13.0 db for 50/125
µ
m cable
• 16.0 db for 62.5/125
µ
m cable
• 19.0 db for 100/140
µ
m cable
OPERATING SPECIFICATIONS
Cabletron Systems reserves the right to change these
specifications any time without notice.
General
Receive Sensitivity:
-29.5 dBm
Max. Receive Power:
-8.2 dBm
Bit Error Rate:
Better than 10
-9
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 ;
-16.5 dBm worst case budget
Into 62.5/125
µ
m fiber: -10.0 dBm ;
19.5 dBm worst case budget
Into 100/140
µ
m fiber: -7.0 dBm;
22.5 dBm worst case budget
Note
: The transmitter power and receive sensitivity
levels are peak power levels. To convert to average
power levels, subtract 3 dbm.
Power Supply
Input Current:
500mA
Input Voltage:
12.0 Vdc typical; 9.5 Vdc
min; 15.75 Vdc max
AUI 15 Pin D-Type Connector
OPERATING ENVIRONMENT
Operating Range:
5˚ to 40˚C (41˚ to 1
04˚
F)
Heat Output:
17 Btu/hr
Storage Range:
-30
˚
to 80
˚
C (-22
˚
to 160
˚
F)
Humidity Range:
5 to 95% (non-condensing)
SAFETY
Designed in accordance with UL 1950, CSA C22.2
No. 950, and EN 60950; the EMI requirements of FCC
Class A and EN 55022 Class A; and the EMC
requirements of EN 50082-1.
Note:
It is the responsibility of the person who sells
the system to which the FOT-DF24 will be a part to
ensure that the total system meets allowed limits of
conducted and radiated emissions.
INSTALLING THE FOT-FB24
To install your FOT-DF24, set the SQE and MIN/MAX
switches, connect the AUI cable to an Ethernet device,
connect the fiber optic ports to the network and use
the cable ties and mounts to provide cable strain relief.
Observe the requirements listed previously in this
guide and the guidelines listed in the following
sections.
Setting the SQE Switch
The SQE (Signal Quality Error) switch is a two position
switch on the top of the transceiver. The FOT-DF24 is
shipped with the SQE switch in the on (
●
) position. To
disable the SQE test function, slide the SQE switch to
the off position (O) as indicated on the front of the
transceiver.
Warning:
Use a non-conductive probe, or disconnect
the transceiver’s AUI connector before setting the SQE
and MIN/MAX switches
.
Caution
:
You must disable the SQE test function if you
connect the FOT-DF-24 to a repeater or to an Ethernet
Version 1 device. In addition, some Version 2
equipment does not support SQE Test. Devices that
do not support the SQE Test function will interpret the
SQE test pulse as a collision, resulting in poor network
performance.
Setting the MIN/MAX Switch
The MIN/MAX switch sets the time duration that the
transceiver waits before switching to the redundant
fiber port. MIN equals approximately 2 seconds. MAX
equals approximately 10 seconds.
Connecting the FOT-DF24 to the Network
1.
Remove the plastic covers from the fiber optic
ports on the FOT-DF24 and from the ends of the
connectors on each fiber cable.
2.
Attach a fiber cable from one transceiver TX port,
to the RX port on the network device. Likewise,
attach a fiber cable from the RX port on the
transceiver to the TX port on the network device.
Repeat this procedure for the second transceiver
port and network device.
3.
Attach the 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
LEDs should be lit to indicate a link between the
transceiver and the network devices. One ACT
LED should be lit to indicate that the port is the
active port (it has received a valid data
packet).The SQE LED will be lit if the SQE test
function is enabled.
USING LANVIEW
LANVIEW is Cabletron Systems’ diagnostic and status
monitoring system.
Power (PWR)
When lit, this green LED indicates that
the FOT-DF24 is receiving power through the AUI
connector. If the PWR LED is not lit, power is not
being received or the DC-to-DC conver ter in the
transceiver has failed.
Signal Quality Error (SQE) Test Function
When lit,
this yellow LED indicates that the transceiver’s SQE
test function is on. The SQE test ensures that the
collision presence circuit and the path between the
Ethernet device and the transceiver are operational.
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 -
