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78
Configuring the 56/64 kbit data
communication modules
Only switch 1 is used on the DIP-switch. In the ON position, transmission timing is gen-
erated internally in the modem. In the OFF position, transmission timing is generated
by the received G.703 signal. Normally the OFF position shall be used when the termi-
nal 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 to OFF.
There are also LEDs for supervision of the communication channel that can be seen
when the cover around the fibre optic connectors is removed. These LED's are located
below the DIP-switch. The function of the LED's isexplained in
1
A
2
3
B
4
5
A
Line connector
B
Cover plate
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Transmitted data
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Received data
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1
2
3
4
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table
41.
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