Comtech EF Data CDM-840 - Manual (Page 221)

F–1
Appendix F. ENTRY CHANNEL
MODE (ECM)
F.1 Functional Overview
Comtech EF Data CDD-880 Multi Receiver Router Installation and Operation Manual
(CEFD P/N MN-CDD880)
Figure F-1. ECM – Message Processing Diagram
Figure F-1 illustrates the processing diagram for Entry Channel Mode (ECM) messaging. ECM is a
feature based on slotted Aloha with random retransmission backoff. ECM supports multiple
carriers through frequency assignments, which provide simplified deployment and scalability. In
a typical Comtech EF Data Advanced VSAT System network, the CDM-840 Remote Router
supports ECM as an installed component of a typical remote site cluster.