Comtech EF Data CDM-570A Installation And Operation Manual page 157

(CONFIG: TI) V2-ACM  ModCod
Min ModCod:00 BPSK
Max ModCod:37 32ARY .879
Use the ◄ ►arrow keys to select the Min(imum) (on the top line) or Max(imum) ModCod range
setting (on the bottom line). Then, use the ▲▼ arrow keys to define the range of ModCods
(00-37) over which the system will operate. Press ENTER.
The minimum setting for VF2S (VersaFEC-2 Short Block) and VF2L (VersaFEC-2 Long Block) is
fixed at ModCod 00 (BPSK Rate 0.489 (0.49 bps/Hz)).
•
For VF2S, the maximum selectable ModCod 35 is 32-ARY Rate 0.831 (4.153 bps/Hz)
•
For VF2L, the maximum selectable ModCod 37 is 32-ARY Rate 0.879 (4.397 bps/Hz)
Press ENTER.
If you wish 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.
(CONFIG: TI) V2-ACM  Unlock-Action
This screen is read-only. Press ENTER or CLEAR to return to the previous menu.
Distant-end loses lock:
Go to Min Tx Modcod(▲ ▼)
(CONFIG: TI) V2-ACM  Target-SNR-Margin
Target SNR Margin:
1.0 dB (0.0 – 4.5)
Use the ▲▼ arrow keys to select a margin value from 0.0 to 4.5 dB, in 0.5 dB increments. Press
ENTER.
The ACM system is designed to switch based on thresholds that correspond to
a BER of 5 x 10
around two ModCods at this exact value, 0.3 dB of hysteresis has been added.
Front Panel Operation
CDM-570A/570AL Satellite Modem with Optional Packet Processor
.489
(▲ ▼)
-8
for each ModCod. However, in order to prevent oscillation
6–41
Revision 5
MN-CDM570A