Comtech EF Data CTOG-250 User Manual
Page 127
CTOG-250 Comtech Traffic Optimization Gateway
Revision 1
Ethernet-based Remote Product Management
MN-CTOG250
7–25
Modulator
The acceptable/valid operating range for each item in this section is provided in parentheses.
• Default MODCOD (read-only) – This section displays the effective data rate of the default
MODCOD based on the symbol rate.
Click the (Change the “
Default Group
” MODCOD) hyperlink to access the Configuration |
WAN | QoS page (Sect.
) if setting changes are needed.
• Total Capacity (read-only) –
Reports the Total Capacity in Kbps of the Outbound Carrier at
the current MODCOD distribution. This the same value as reported on the Status | Statistics
| Outbound page.
• Outbound ACM – Use the drop-down list to Enable or Disable Outbound ACM. Click
[Submit] to save.
Appendix E. OUTBOUND ACM (ADAPTIVE CODING
AND
MODULATION)
Outbound ACM (Adaptive Coding and Modulation) allows you to configure the CTOG-250 to
dynamically adjust the DVB-S2 MODCODs that are sent to each CDM-840 Remote Router
based upon the conditions at that remote. These conditions include antenna size, look angle
and satellite band, as well as the current environmental conditions. Each remote will
automatically and periodically send its Rx Es/No to the associated CTOG-250.
Requirements for Outbound ACM operation are as follows:
1. Comtech Dynamic Routing Protocol (CDRP) must be enabled because the ACM
Controller uses the remote to route mapping provided by CDRP to properly determine
the required MODCOD upon which to transport the packets destined to each remote.
(To enable CDRP, see Sect. 7.4.4.3.3.1 Configuration | Network | Routing.)
2. Outbound ACM must be enabled.
3. When Outbound ACM is disabled, all packets will revert to the “VCM Only MODCOD”
which is configured in each QoS Group.
4. Each CDM-840 must be locked to the Shared Outbound carrier from the CDM-800.
If a CDM-840 Remote Router reports that its demod is unlocked, the ACM
Controller will assign the lowest MODCOD (QPSK ¼) 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.
5. A packet path is required from the CDM-840 to the CDM-800 Management Interface.