53
Configuring the interface modules for
G.703 co-directional
Chapter 8
Configuring the digital
communication modules
5
Configuring the interface modules for
G.703 co-directional
No setting is available for the G.703 modem on the HMI. There are however some that
can be made on a DIP-switch located behind the cover around the line connector at the
back of the terminal according to figure 13. 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 indication 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 7.
Figure 13: G.703 modem, connection, indications and settings
A
Line connector
B
Cover plate
xx01000137.vsd
B
1
2
3
4
5
A
On
1
2
3
4
TXD
RXD
