Comtech EF Data CDM-570A - Manual (Page 542)

CDM-570A/570AL Satellite Modem with Optional Packet Processor MN-CDM570A
Appendix G Revision 2
G–24
G.6.7 CnC-APC Setup
To set up CnC-APC, carefully follow and understand the steps as presented here.
CAUTION – This procedure should be done only when there are CLEAR SKY
conditions at both ends of the link.
1) Set up the CnC link in ‘normal’ mode according to the instructions earlier in this appendix,
and according to an appropriately calculated link budget.
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-570A/AL front panel, select the CONFIG: CnC  Mode submenu. The
appearance of the submenu differs as follows:
CDM-570AL (L-Band): CDM-570A (70/140 MHz):
CnC Mode: Off On APC
Action (◄ ►,ENTER)
Mode: Off
For either unit, the available CnC selections are:
• Off • APC,Side-A,C-Band • APC,Side-B,C-Band
• On (normal) • APC,Side-A,X-Band • APC,Side-B,X-Band
• APC,Side-A,Ku-Band • APC,Side-B,Ku-Band
• APC,Side-A,Ka-Band • APC,Side-B,Ka-Band
If it is not known which satellite band is in use, do not attempt to engage
CnC-APC.
For the CDM-570AL only: First, use the ◄ ► arrow keys to select CnC Mode as APC. Do not
select Action at this time. Press ENTER when done. The nested APC screen appears:
APC: SideA C,X,Ku,Ka-band
SideB C,X,Ku,Ka-band ◄ ►
On the top line: Use the ◄ ► arrow keys to select the operating frequency for Side A: C, X,
Ku, or Ka-band.