CDM-840 Remote Router MN-CDM840
Ethernet-based Remote Product Management Revision 3
6–30
6.3.3.2.1.2 Configuration | WAN | Demod | ACM (Adaptive Coding and
Modulation)
VersaFEC ACM requires Version 1.3.2 or higher firmware and the appropriate FAST
code for the maximum operating symbol rate.
Use this page to configure CDM-840 Rx ACM operations.
Figure 6-17. Configuration | WAN | Demod | ACM Page
Outbound ACM allows you to configure a CTOG-250 Comtech Traffic Optimization Gateway to
dynamically adjust the DVB-S2 MODCODs that are sent to each CDM-840 Remote Router, based
on the conditions at that remote site. These conditions include antenna size, look angle and
satellite band, as well as the current environmental conditions. Each CDM-840 will automatically
and periodically send its Rx Es/No to the associated CTOG-250.
Requirements for ACM operation are as follows:
• Outbound ACM must be enabled at the CTOG-250.
• When Outbound ACM is disabled at the CTOG-250, all packets will revert to the “VCM Only
MODCOD” which is configured in each QoS Group.
• Each CDM-840 must be locked to the Shared Outbound carrier from the CTOG-250.
If a CDM-840 Remote Router reports that its demod is unlocked, the CTOG-250
ACM Controller will assign the lowest MODCOD (QPSK 1/4) to that remote in an
effort to “recover” the remote. Once the remote locks again, the ACM
algorithm adapts to the correct MODCOD for the reported Rx Es/No.
• A return packet path is required from the CDM-840 to the CTOG-250 Management
interface.
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