Service manual

CENTRAL DE-MULTIPLEXER MODULE (CDM)
5-2
March 2000
Part No. 001-3139-502
5.4 SWITCH SETTINGS NOTE: CDM input goes in on CDM P1, pins 1 and 2
(right connector).
5.5 ALIGNMENT
NOTE: If the CDM is set for Digital Operation, align-
ment is not required.
5.5.1 CDM ANALOG FSK OPERATION
1. Inject a 1200 Hz signal at -12 dBm to P1, pin 22.
2. Adjust R28 for -12 dBm at TP101.
5.5.2 CDM FINAL ALIGNMENT
1. The maximum level is being received from the
transmission line (RMM link).
2. Adjust R28 for 0 dBm (±2 dBm) at TP101.
Table 5-2 CDM SWITCH SETTINGS
SWITCH SEC. DESCRIPTION
S1 1
2
3
4
On - CDM output for CH6
On - CDM output for CH5
On - CDM output for CH8
On - CDM output for CH7
S2 1-2
3-4
Off
On - CDM input enabled
S3 1
2
3
4
On - CDM output for CH2
On - CDM output for CH1
On - CDM output for CH4
On - CDM output for CH3
S4 1
2
2
3
4
On - CDM Demux
On - 1200 Baud FSK (Normal)
Off - 9600 Baud RS-232
On - CDM output for CH10
On - CDM output for CH9
S100 1
2
3
4
Off - Test, On - Normal
Off - Test, On - Normal
Off - Test, On - Normal
Off - Test, On - Normal