AIS 3410, Electronics Unit
ED3047G842 / 01 (2009-08)
Technical Manual
4 Functional Description
4.2 Termination
t_ue_e04.fm / 27.08.09
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The VHF transmitter/receiver has a limited range. By means of the connection of a long range commu-
nication system (such as a satellite communication system) to the long range port, this limitation can be
eliminated. In this way, the AIS can be called to send the ship’s data. The requested data are sent via
the long range port and the long range communication system to the questioner. The operator can decide
whether a long range request is answered or not.
4.2
Termination
The wiring must be done in accordance with
with 50
Ω
coaxial cable (for example inside the
enclosures, RG 58, for ship’s cabling RG 213 / U, see cabling diagrams). The network is a 10 Mbit
network.
The BNC-T plugs must be connected directly into the Ethernet Module. It is not admissible to connect the
T-plug and the network adapter by means of a coaxial cable.
Proper termination with a 50
Ω
BNC termination plug at both ends of the Ethernet line is very important.
It is not permissible to use cable with a characteristic impedance different from 50
Ω
.
If no cable is connected to the Ethernet connector, it must also be terminated.
Fig. 4-2
Principle of wiring for Ethernet LAN
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T
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