ABB REL 551 2.3 Series Installation And Comissioning Manual page 63


Configuring the interface modules for
G.703 co-directional
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No setting is available for the G.703 modem on the HMI. There are however some set-
tings that can be made on a DIP-switch located behind the cover around the line con-
nector at the back of the terminal according to figure 16. After the connector has been
disconnected, if attached, the cover plate can be removed just by pulling at the middle
of the cover plate. No settings are located on the circuit board.
Only switch 1 is used on the DIP-switch. In position ON the timing for transmission is
created internally in the modem. In position OFF the timing for transmission is recov-
ered from the received G.703 signal. Normally position OFF shall be used when the
protection is connected to a multiplexer or other communication equipment.If used in
back to back operation switch 1 is set in ON position at one end and in OFF position at
the other end. The rest of the switches shall be set OFF.
There are also some indications for supervision of the communication channel that can
be seen when the cover around the fibre optic connectors is removed. These LED's are
found below the DIP-switch. The function of the LED's are explained in table
cations".
1
A
2
3
B
4
5
A Line connector
B Cover plate
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On
1
2
3
4
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