Comtech EF Data CDM-840 - Manual (Page 224)

CDM-840 Remote Router Revision 2
Appendix F MN-CDM840
F–4
F.2 Entry Channel Mode Operation
See Sections F.1 Functional Overview and F.4 Glossary of Terms for descriptions
of the terminologies referred to in this section.
F.2.1 ECM Configuration using the Web Server Interfaces
Figure F-2. CDM-840 and CDD-880 ‘Configuration | ECM’ pages
Proper deployment of ECM in the Advanced VSAT Network requires complimentary
configuration of both the hub site CDD-880(s) and the remote site CDM-840(s) using each
product’s Web Server Interface ‘Configuration | ECM’ page (Figure F-2):
• Use the CDM-840 Web Server Interface to configure one of three modes (states) of ECM
operation: Online, Wait or Offline.
• Use the CDD-880 Web Server Interface to configure a basic set of parameters that
define the channel group. The settings consist of Enabling, TAP Multicast IP Address,
TAP (group) ID, Guard Band and a total count of Slots in Frame (combined SAS and SRS)
per cycle.
In addition, you must specify an LNB LO Frequency and Satellite Frequency Conversion to
accommodate mismatches between the hub site LNB and remote site BUCs. Channel
parameters are determined from the CDD-880 configuration settings. If spectral inversions
apply, all hub receiving CDD-880s that are part of that downlink chain must be set to match.