Idnet - Simplex 4100ESi Installation Manual

Two methods are available for joining fibre cable. Splices provide a permanent, low loss, fibre-to-fibre
connection. Couplers provide temporary connection between two ST style connectors with a loss of
1.2dB. Both methods are valid on a fibre network.
The characteristics of the 4100-6057 fibre optic media card are as follows:
⋅
The minimum Launch Power into a 50/125µm cable is 50µW (13dBm).
⋅
The 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).
The maximum line lengths for 50/125 and 62.5/125 cable are shown in the table below.
Table 9. Maximum distance for fibre optic cable
Fiber cable
50/125µm
50/125µm
62.5/125µm
62.5/125µm
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.

IDNet

Use ferrite beads on each pair of wires leaving the 4100ESi cabinet. See Figure 59.
Figure 59. Ferrite bead wiring
Shielded cable is recommended in electrically noisy environments.
Do not run IDNet cabling adjacent to other cabling, especially non-fire system cabling such as mains.
The limiting factors on the length of the twin core cable connecting the IDNet devices to the IDNet card
are cable capacitance; attenuates the superimposed coms signal, and resistance; causes voltage drop
of the supply voltage and comms signals.
The maximum capacitance of 0.58µF core to core must include the mutual capacitance of core to
earth. Shielded cable has a higher capacitance to earth than unshielded cable.
Loss per kilometer
4dB
3dB
4dB
3.75dB
Power margin
4dB
3dB
4dB
3dB
Maximum distance
3,050m
4,500m
4,000m
4,500m
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