PRELIMINARY
Maintenance and Spare Parts
8.
Move the PCM terminal(s) to the connection board CB21.
The CB21 board can only be used if the transmission type is
equal for PCM A and PCM B.
Note:
If the RBS is cascaded, this step must be completed within
10 seconds, otherwise the PCM line will be lost.
If the RBS is not cascaded (PCM B has been terminated), it is not
necessary to use the CB21 connection board.
P004886A
LOOP BACK
LOOP FOR
WARD
PCM A
PCM B
PCM A
LOOP BACK
LOOP FOR
WARD
CB 21
Figure 125
9.
Unplug the AC terminal.
P004899A
LOOP BACK
LOOP FOR
WARD
PCM A
PCM B
PCM A
Figure 126
LZN 302 14
P3A-1
1999-11-10
99 (158)
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