CDM-840 Remote Router MN-CDM840
Ethernet-based Remote Product Management Revision 3
6–31
Rx ACM Configuration
• Rx Max MODCOD – Use the drop-down list to select the maximum demodulation type and
FEC rate (MODCOD). The available DVB-S2 selections are:
• QPSK 1/4 • QPSK 1/3 • QPSK 2/5 • QPSK 1/2
• QPSK 3/5 • QPSK 2/3 • QPSK 3/4 • QPSK 4/5
• QPSK 5/6 • 8PSK 3/5 • 8PSK 2/3 • 8PSK 3/4
• 16APSK 2/3 • 16APSK 3/4 • 16APSK 5/6 • 16APSK 9/10
• 32APSK 3/4 • 32APSK 4/5 • 32APSK 5/6 • 32APSK 9/10
• Rx Target Es/No Margin – Use the drop-down list to select a margin value, in 0.5 dB
increments, from 0.0 to 4.5 dB.
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.
• CIR Threshold MODCOD – Use the drop-down list to select the Commited Information Rate
(CIR) Threshold MODCOD that is reported to the CTOG-250 and used by the Highly
Degraded Remote feature. As long at the remote maintains a signal quality which
corresponds to the CIR Threshold MODCOD or above, the CTOG-250 will continue to honor
the configured CIR as expected.
If the Outbound assigned MODCOD for a given remote drops below the configured CIR
Threshold MODCOD, the Qos Scheduler will scale back, if required, the throughput for the
remote in order to prevent a highly-degraded remote from affecting the throughput of the
entire outbound carrier.
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Rx ACM Status
Information is presented in this read-only section as follows:
• Rx ACM Enable – Identifies ACM operation on the CTOG-250 as Enabled or Disabled.
• Time Since Last Controller Announcement – Amount of time in seconds since the CDM-840
received an announcement message from the CTOG-250.
• Max Time Since Last Controller Announcement – Maximum amount of time since the last
announcement message was received from the CTOG-250.
• ACM/VCM Controller IP Address – The assigned IP Address for the Controller. This will be
the Management IP Address for the associated CTOG-250.
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