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CDD-880 Multi Channel Receiver
Appendix A
A.5
ECM (Entry Channel Mode) Operation
ECM (Entry Channel Mode) operation is available in the CDD‐880 Multi Receiver Router and in
the CDM‐840 and ODM‐840 Remote Routers. ECM is based on slotted Aloha with random
retransmission backoff. It supports multiple carriers through frequency assignments, which
provide simplified deployment and scalability.
While a Remote Router is in Entry Channel Mode, it allows the passing of management traffic
only – it will not transmit user data traffic. An ECM‐enabled Remote Router may remain in the
entry channel for an extended period if "online" communications are not required, or if dSCPC
(dynamic Single Carrier Per Channel) resources are unavailable. While idle or waiting in the entry
channel, the Remote Router sends periodic health status messages to the CTOG‐250 and
Vipersat Management System (VMS) while it continues to service VMS recovery logic timers.
•
Appendix D. ECM (ENTRY CHANNEL MODE) in this manual.
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Appendix G. ECM (ENTRY CHANNEL MODE) in the Comtech EF Data CDM-840
Remote Router Installation and Operation Manual (CEFD P/N MN-CDM840)
•
Appendix G. ECM (ENTRY CHANNEL MODE) in the Comtech EF Data ODM-840
Remote Router / ODMR-840 Reduced Form Factor Remote Router / ODMR-
840B Remote Router Board Set Installation and Operation Manual (CEFD P/N
MN-ODM840)
A–5
MN-CDD880
Revision 2
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