Comtech EF Data CDM-840 - Manual (Page 235)

CDM-840 Remote Router Revision 2
Appendix G MN-CDM840
G–3
G.2 E1 RAN Optimization
Jointly developed by Comtech EF Data, CEFD sister division Comtech AHA Corp., and CEFD
subsidiary Memotec Inc., RAN Optimization technology significantly reduces the Wide Area
Network (WAN) / satellite bandwidth required to carry an E1 bearer used for cellular backhaul.
RAN Optimization allows the transmit modem data rate to be reduced relative to the input
terrestrial data rate, thus allowing the transport of a user-selectable channel subset of bearer E1
using less bandwidth. In the receive direction, the data is restored to the E1 format for transport
over the G.703 E1 interface.
The process is designed to allow varying levels of optimization to accommodate the incoming
terrestrial data in the reduced modem data rate. Optimization performance depends on the
traffic profile and the difference between the terrestrial data rate (based on input timeslot
selection) and the transmit modem data rate. The optimization is performed in hardware for
optimal performance.
The user has complete control over the desired level of optimization by selecting the time slots
to be optimized, and the transmit modem data rate. Depending on the traffic profile, typical
bandwidth reduction of 30-35% can be achieved with little or no impact to the voice quality.
Users have the option to reduce WAN bandwidth by as much as 60% relative to the ingress data
rate – this allows the users to achieve desired bandwidth savings while maintaining desired
voice quality.