J-2
Fibre Optic Cable Characteristics
All fibre cables must be multimode, graded index. ST style connectors must be used. No
physical strain should be put on the cables. There must be no cable bends of less than a
50mm radius.
Two methods are available for joining fibre cable. Splices provide a permanent, very low
loss, fibre-to-fibre connection. Couplers provide temporary connection between two ST
style connectors with a loss of 1.2dB. Both methods are permitted on a fibre network.
The characteristics of the 4100-0143 fibreoptic media card are as follows:
Mininum Launch Power into a 50/125µm cable is 50µW (-13dBm).
Minimum Launch Power into a 62.5/125µm cable is 109.5µW (-8.6dBm).
The maximum value for the minimum input sensitivity of the receiver is 1.0µW (-30
dBm).
Maximum line lengths for 50/125 and 62.5/125 cable are shown in the table below.
Table J-2 Network: Maximum Distances, Optical Fibre
Fibre Cable Loss Per Kilometer Power Margin Maximum distance
50/125 Fibre 4 dB 4 dB 3,050 meters
50/125 Fibre 3 dB 3 dB 4,500 meters
62.5/125 Fibre 4 dB 4 dB 4,000 meters
62.5/125 Fibre 3.75 dB 3 dB 4,500 meters
All the information above is based on the minimum launch power of the transmitter into
the specified cable and the maximum value of the minimum input sensitivity of the
receiver.
Network, Continued
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