Comtec CDM-840 Installation And Operation Manual page 113

CDM-840 Remote Router
Ethernet-based Remote Product Management
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 3/5
•
QPSK 5/6
•
16APSK 2/3
•
32APSK 3/4
•
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
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.
Click [Submit] to save.
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.
• QPSK 1/3
•
QPSK 2/3
•
8PSK 3/5
•
16APSK 3/4
•
32APSK 4/5
-8
for each MODCOD. However, in order to prevent oscillation
6–31
• QPSK 2/5
•
QPSK 3/4
•
8PSK 2/3
•
16APSK 5/6
•
32APSK 5/6
MN-CDM840
Revision 3
• QPSK 1/2
•
QPSK 4/5
•
8PSK 3/4
•
16APSK 9/10
•
32APSK 9/10