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388
G.703 module
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This interface module is intended for connection to commercially available communi-
cation equipments or multiplexers with G.703 interface. It can only be used with trans-
mission rate of 64 kbit/s. Furthermore it only supports co-directional operation. Contra-
directional and centralised clock are not supported.
Even if the standard claims that the reach can be rather long at 64 kbit/s, it is not rec-
ommended to use this for protection purposes where the communication has to be reli-
able also under primary power system faults. This is due to the low level of the
communication, signals only 1 V, which gives low margin between signal and noise. If
the protection and the communication equipment are located in the same room and the
environment is free of noise, the protection terminal may be connected directly to the
multiplexer via shielded and properly earthed cables with twisted pairs, same as shown
in figure for V.36 etc, for distances up to 10 m.
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