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386
Short range optical fibre module
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The short range optical fibre modem is used for point to point synchronous 64 kbit/s
data transmission at distances up to 5 km, the principle is according to figure 209. It can
also be used together with optic fibre transceiver type 21-15xx/16xx from FIBERDA-
TA in order to get an optical link between the protection terminal and a remotely located
communication equipment as in figure 210.
21-15xx supports interfaces according to ITU (former CCITT) standards V.35 and V.36
co- and contra-directional. 21-16xx supports interfaces standards X21 and G.703 ac-
cording to ITU (former CCITT) and RS.530 according to EIA co- and contra-direction-
al.
Transmission is performed simultaneously in both directions, full duplex, over two op-
tical fibres. The fibres shall be of multi mode type, 50/125 µ m or 62.5/125 µ m.
The optical budget of the modem is 15dB. This means that the total loss in the fiber op-
tic communication path including splices, connectors and also ageing of the fiber has to
be less than 15dB. The losses in the connection to the protection terminal are not to be
included in the optical budget since they are already accounted for. The maximum reach
will depend on the properties of the used optical fiber but is between 3 and 5 km during
normal conditions.
The short range optical module has ST type connectors.
Optical
fibres
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