Config: Acm (Adaptive Coding And Modulation) (Ip-Acm Mode Only); Config: Acm  Min/Max-Modcod; Config: Acm  Unlock-Action - Comtech EF Data CDM-625A Installation And Operation Manual

CDM-625A Advanced Satellite Modem
Front Panel Operation
6.2.1.7 CONFIG: ACM (Adaptive Coding and Modulation) (IP-ACM Mode
Only)
Appendix M. ADAPTIVE CODING AND MODULATION (ACM)
ACM Config: Min/Max-ModCod
Target-EbNo-Margin
Use the ◄ ► arrow keys to select Min/Max-ModCod, Unlock-Action, or Target-EbNo-Margin,
and then press ENTER.
6.2.1.7.1 CONFIG: ACM  Min/Max-ModCod
Min Modcod: 00 (B
Max Modcod: 00 (B
Use the ◄ ► arrow keys to select the Min(imum) or Max(imum) ModCod range setting. Then,
use the arrow keys to define the range of ModCods (00 through 11) over which the system
▲▼
will operate. Press ENTER when done.
ModCod 00 is BPSK Rate 0.488 (0.49 bps/Hz), while ModCod 11 is 16-QAM Rate 0.853
(3.41bps/Hz).
If you wishes to constrain the system to run at a fixed ModCod, set the Min and
Max ModCod values to be equal.
The value of Max ModCod may be limited by other FAST codes installed. For
example, suppose the 4100 ksps FAST option is installed, and the symbol rate set
to 4100 ksps, the theoretical maximum data rate would be 14 Mbps at ModCod 11.
However, if CnC is being used, with a 10 Mbps FAST limit the ACM Max ModCod
will be limited to ModCod 7, or 9.6 Mbps.
6.2.1.7.2 CONFIG: ACM  Unlock-Action
When distant-end demod loses lock:
Go to min Tx ModCod (Maintain,Min)
Use this submenu to establish the desired action when the remote demod loses lock. This is
important, as the ACM system depends on the feedback of the SNR metric from the remote
demod to determine the optimum ModCod. Use the
ModCod (recommended) or Maintain Tx ModCod, and then press ENTER.
Unlock-Action
0.488 0.488 bps/Hz)
0.488 0.488 bps/Hz)
arrow keys to select Go to min Tx
▲▼
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