Comtech EF Data CDM-625A - Manual (Page 631)

CDM-625A Advanced Satellite Modem MN-CDM625A
Appendix F Revision 3
F–25
Once the link is established, a further re-balance, activation or suspension does not require
another person to be present, or independent remote IP access.
2) Once the ‘normal’ CnC link has been established, determine that the link is stable and that it
has an acceptable link margin at both ends.
3) Decide, arbitrarily, which is Side ‘A’, and which is Side ‘B’.
4) From the CDM-625A front panel, select the CONFIG  CnC  Mode menu:
CnC Mode: APC,Side A,C-Band (Off, On, APC)
Activate? N (Y,N) APC is not active ()
On the top line, use the ▲▼ arrow keys to select the appropriate CnC operating mode.
Available selections are:
• Off • On (normal) • APC,Side ‘A’, C- Band
• APC,Side ‘A’,X-Band • APC,Side ‘A’,Ku-Band • APC,Side ‘A’,Ka-Band
• APC,Side ‘B’, C- Band • APC,Side ‘B’,X-Band • APC,Side ‘B’,Ku-Band
• APC,Side ‘B’,Ka-Band
If it is not known which satellite band is being used, no attempt should be
made to engage CnC-APC.
Once the mode has been selected, press ENTER – do not select Activate (on the bottom
line) yet.
Note the following:
• If Side ‘A’ is selected at both sides, or Side ‘B’ is selected at both sides, both modems
will display a Frame Sync fault (under Rx faults). No further action is possible until this
error has been corrected.
• If different satellite bands are selected on each side (for instance, Side ‘A’ is Ku-Band,
while Side ‘B’ is C-Band) the modem will display an APC Band Mismatch fault (under Rx
faults). No further action is possible until this error has been corrected.
5) Based on the known RF terminal equipment in use, determine a value for the maximum
allowed power increase (TPLI
max
) and then set this value. From the CDM-625A front panel,
select the CONFIG Tx  Power menu:
Output Power Mode = Cn C- Auto-Power-Control
Level = -25.0dBm MaxPwrIncrease=2.5dB ()