Comtech EF Data CDM-625 - Manual (Page 357)

CDM-625 Advanced Satellite Modem Revision 15
DoubleTalk Carrier-in-Carrier Option MN-CDM625
10–27
Displayed Message Expanded Meaning
Local RSL too low The local RSL is below the minimum for the operating symbol rate
Dist RSL too low The distant RSL is below the minimum for the operating symbol rate
If the message shown begins with OK, then after approximately 5 seconds, the display
changes as per the following example:
The CnC Mode: APC,Side A,C-Band (Off, On, APC)
Suspend? N (Y,N) APC is active ()
At this point, as indicated on the bottom line of the display, CnC-APC is active.
To suspend CnC-APC at any time: On the bottom line, which will be displaying Suspend?
N (Y,N), use the ▲▼ arrow keys to select Y(Yes)and then press ENTER. The CnC-APC
status message on the bottom line of the display will update accordingly, as per the
following example:
The CnC Mode: APC,Side A,C-Band (Off, On, APC)
Activate? N (Y,N) APC is not active ()
Note that, when CnC-APC is suspended, it is de-activated on both sides.
If a message other than OK is displayed after attempting to perform a rebalance, the CnC-
APC system will not activate, and you should correct the link conditions before re-
attempting to activate it.
CAUTION – READ THIS IMPORTANT NOTE:
When CnC-APC is active, you are not permitted to change configuration
parameters that potentially affect the operation of CnC-APC (modulation type,
FEC type, code rate, framing, etc). If you attempt to change one of these
parameters either locally or remotely, the change will not be accepted. In order
to change these configuration parameters, CnC-APC needs to be suspended first.
Following the changes, you should re-activate CnC-APC. Be aware that the re-
activation will be preceded with a new rebalance operation.
10.6.7 CnC-APC Redundancy Support Notes
1. The initial release of the CnC-APC feature (in CDM-625 Firmware Version 2.0.2) fully
supports 1:1 redundancy. Note that, as is required with standard CnC 1:1 redundancy
operation, a PMSI cable is required to connect the two units in a 1:1 pair.
Sect. 5.2.1.8.4 CONFIG: CnC  PMSI-Control (Chapter 5. FRONT PANEL
OPERATION)