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Remote end data communication
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The hardware communication modules (or modems) for the Remote end data commu-
nication are available in basically three different versions:
•
for optical communication
•
for short range pilot wire communication
•
for galvanic connection to communication equipment according to ITU (former
CCITT) and EIA interface standards.
All systems are designed to be able to work at 64 kbit/s. Some of them can also work at
North American standard of 56 kbit/s. This is especially pointed out in the description
under each module.
If the protection terminal is located at a long distance (>100 m for V.36, X.21 and
RS530 and >10m for G.703) from the communication equipment or multiplexer or if
the cables run through a noisy area, optical communication should be used to intercon-
nect the protection terminal and the communication equipment. In this case the protec-
tion terminal contains module used for optical fibre communication and a suitable
optical to electrical converter is installed close to the communication equipment due to
the fact that there exists no standard for optical connections to communication equip-
ment. The optical-to-electrical converters that can be used are FOX6Plus (and FOX20)
from ABB and 21-15xx or 21-16xx from FIBERDATA. The FOX6Plus together with
optical fibre modem supports the G.703 co-directional interfacing and with restrictions
for X.21 and V.36. 21-15xx supports V.35 and V.36 while 21-16xx supports X.21,
G.703 and RS530 co-directional and contra-directional. For 21-15xx and 21-16xx short
range optical fibre modem is needed.
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