Comtech EF Data CDM-625A Installation And Operation Manual page 593

CDM-625A Advanced Satellite Modem
Appendix F
The initial selection of CnC-APC normally requires that a person be present at both ends, to
coordinate the change of CnC from 'normal' to CnC-APC mode. Alternately, if an IP
connection is available to the distant end that does not depend on the satellite link for
primary connectivity, the setup can be performed remotely.
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
Activate? N (Y,N) APC is not active
On the top line, use the
Available selections are:
• Off
• APC,Side A,X-Band
• APC,Side B,C-Band
• APC,Side B,Ka-Band
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
select the CONFIG Tx  Power menu:
arrow keys to select the appropriate CnC operating mode.
▲▼
• On (normal)
• APC,Side A,Ku-Band
• APC,Side B,X-Band
If it is not known which satellite band is being used, no attempt should be
made to engage CnC-APC.
) and then set this value. From the CDM-625A front panel,
max
(Off, On, APC)
F–25
Revision 0
MN-CDM625A
()
• APC,Side A,C-Band
• APC,Side A,Ka-Band
• APC,Side B,Ku-Band