Comtech EF Data CTOG-250 - Manual (Page 194)

CTOG-250 Comtech Traffic Optimization Gateway Revision 1
Appendix A MN-CTOG250
A–4
A.4 E1 WAN/RAN Optimization
E1 RAN (Radio Access Network) Optimization technology, jointly developed by Comtech EF Data,
CEFD sister division Comtech AHA Corp., and CEFD subsidiary Memotec Inc., is used to
significantly reduce the Wide Area Network (WAN) / satellite bandwidth required to carry an E1
bearer used for cellular backhaul. It is a feature available with the CDM-840 and ODM/R-840
Remote Routers and the CXU-810 RAN Optimizer.
• Appendix C. WAN/RAN OPTIMIZATION in the Comtech EF Data CDM-840
Remote Router Installation and Operation Manual (CEFD P/N MN-CDM840)
• Appendix C. WAN/RAN OPTIMIZATION in the Comtech EF Data ODM-840
Outdoor Remote Router / ODMR-840 Reduced Form Factor Outdoor Remote
Router Installation and Operation Manual (CEFD P/N MN-ODM840)
• Memotec CX-U Series Hardware Reference Manual (Memotec Inc. P/N CX-U-
HW-Guide)
A.5 Entry Channel Mode (ECM)
ECM operation is available in the CDM-840 / ODM/R-840 Remote Routers and CDD-880 Multi
Receiver Routers. ECM is a feature based on slotted Aloha with random retransmission backoff.
It supports multiple carriers through frequency assignments, which provide simplified
deployment and scalability.
While a CDM-840 is in Entry Channel Mode, it allows the passing of management traffic only – it
will not transmit user data traffic. An ECM-enabled CDM-840 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
CDM-840 sends periodic health status messages to the CTOG-250 and Vipersat Management
System (VMS) while it continues to service VMS recovery logic timers.
• Appendix E. ENTRY CHANNEL MODE (ECM) in the Comtech EF Data CDM-840
Remote Router Installation and Operation Manual (CEFD P/N MN-CDM840)
• Appendix E. ENTRY CHANNEL MODE (ECM) in the Comtech EF Data ODM-840
Outdoor Remote Router / ODMR-840 Reduced Form Factor Outdoor Remote
Router Installation and Operation Manual (CEFD P/N MN-ODM840)
• Appendix C. ENTRY CHANNEL MODE (ECM) in the Comtech EF Data CDD-880 Multi
Receiver Router Installation and Operation Manual (CEFD P/N MN-CDD880)