Comtech EF Data CDD-880, Installation And Operation Manual

Page: 227 / 234

CDD-880 Multi Receiver
Router
MN-CDD880
Appendix H Revision 2
H–9
3.
In the “
Tx ACM Configuration”
section on the page, use the drop-down lists to configure the
“ Target Es/No Margin” and the “ Max MODCOD” . Click [Submit] to save your settings.
1) Select, at minimum, 0.5db as the recommended value for the “Target
Es/No Margin” in order to maintain the link at Ku.
2) The “Max MODCOD” should be configured to the maximum MODCOD that
this terminal can achieve given the link budget, antenna, look angle, BUC
power, etc.
4. Use the “ACM Enable” drop-down list in the “ Tx ACM Configuration” section on the page to
“ Enable” ACM. Click [Submit] to save your settings.
Figure H-5. CDM-840 HTTP Interface – Configuration | WAN | Mod | ACM Page
H.4.2 Troubleshooting
Referring to the CDM-840 HTTP Interface “ Configuration | WAN | Mod | ACM” page ( Figure
H-5 ):
• Confirm that the "Seconds since last LQRM" column (found in the “Tx ACM Status”
section on the page) periodically resets to ‘0’ – this indicates that the LQRMs are being
received by the CDM-840.
•
Confirm that the proper Management IP Address appears in the “880 IP” column. It will
be populated automatically.
H.4.3 Monitoring ACM Performance
The CDM-840 provides several ways to determine the current state of the ACM system.
Referring to the CDM-840 HTTP Interface “ Configuration | WAN | Mod | ACM” page ( Figure
H-5 ), the “Tx ACM Status” table on the page contains many useful reported fields: