Comtech EF Data CDM-625 - Manual (Page 137)

CDM-625 Advanced Satellite Modem Revision 15
Front Panel Operation MN-CDM625
5–37
5.2.1.7.3 CONFIG: ACM  Target-EbNo-Margin
Target Eb/No 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 when done.
The ACM system is designed to switch based on thresholds that correspond to a
BER of 5 x 10 -8 for each ModCod. However, in order to prevent oscillation around
two ModCods at this exact value, 0.3 dB of hysteresis has been added.
5.2.1.8 CONFIG: CnC
CnC operation requires installation of the DoubleTalk Carrier-in-Carrier module. In
addition to installing the CnC module, you needs to purchase one of several
available FAST options to provide capability to a maximum of 25Mbps.
1. Chapter 10. DoubleTalk Carrier-in-Carrier OPTION
2. For more information about purchasing FAST options:
• Sect. 5.2.8 SELECT: FAST menus
• Sect. 1.3.10 Fully Accessible System Topology (FAST)
• Appendix C. FAST ACTIVATION PROCEDURE
Carrier in Carrier: Mode Freq-Offset
Search-Delay PMSI-control ()
Use the ◄ ► arrow keys to select Mode, Freq-Offset, Search-Delay, or PMSI-control, and then
press ENTER.
5.2.1.8.1 CONFIG: CnC  Mode
See Sect. 10.6 Carrier-in-Carrier Automatic Power Control (CnC-APC) in Chapter 10.
DoubleTalk Carrier-in-Carrier OPTION for complete details about, and setup of, the
CnC-APC feature.
CnC Mode: APC,Side A,C-band (Off, On, APC)
Activate? N(Y,N) APC is not active ()
On the top line – Use the ▲▼ arrow keys to select the appropriate CnC operating mode.
Available selections are:
• Off • On (normal) • APC,Side A,C-band
• APC,Side A,X-band • APC,Side A,Ku-band • APC,Side A,Ka-band