Specializing in satellite communications, Comtech EF Data has a unique ability to deliver bandwidth-efficient and scalable solutions to cellular operators. With our satellite modems and transceivers, you can achieve bandwidth optimization, resulting in significant operating expense savings.  Comtech EF Data designed cellular backhaul-enabled satellite modems capable of delivering optimal performance and spectral utilization at multiple layers. With the industry’s widest range of forward error correction, modulation formats and code rates, our modems can provide the right combination to simultaneously optimize transponder,power and bandwidth.

Backhaul Configurations
Our robust cellular backhaul solutions can be deployed in point-to-point network configurations. In addition, for multipoint and partial mesh networks providing remote connectivity of lower density areas, the Comtech solutions improve transport efficiency and lower the total cost of ownership.

Forward Error Correction & Modulation
We offer all traditional forward error correction plus optional, advanced methods combined with higher order modulation that provide increased coding gain, lower decoding delay and significant bandwidth and power savings. Whether your network utilizes GSM or CDMA, we have forward error correction and modulation ideally suited to meet the performance requirements of cellular backhaul.

Drop & Insert (D&I)
We support two variants of Drop & Insert for cellular backhaul, providing flexibility to transmit/receive fractional parts of a T1 or E1 data stream.

Quad E1 Interface with D&I++
To simplify configuration for sites requiring multiple E1s, the CDM-Qx/L Satellite Modems offer a Quad E1 interface with D&I++ on each E1. Any combination of 1 to 31 time slots can be dropped or inserted per E1, allowing for aggregation of 1 to 128 time slots into a single carrier. This is done with a minimal 0.4% framing overhead, compared to the traditional 6.7%.

DoubleTalk® Carrier-in-Carrier®
Our revolutionary and award-winning DoubleTalk Carrier-in-Carrier is based on Applied Signal Technology’s patented “Adaptive Cancellation” technology that allows full duplex satellite links to transmit concurrently in the same segment of transponder bandwidth - doubling your throughput. When combined with our advanced forward error correction and modulation techniques, DoubleTalk Carrier-in-Carrier delivers improved satellite transponder utilization and unprecedented operating expense savings.

G.703 Clock Extension
Cellular networks require precise synchronization of base stations, which becomes a challenge when using IP backhaul. Most operators are forced to use GPS-based external equipment for site synchronization. The CDM-570/L Satellite Modems offer G.703 clock extension when using IP backhaul, that propagates a high stability reference from hub to the remote. A high stability E1/T1 reference signal is fed to the hub modem. The remote modem generates a T1/E1 signal synchronized to the reference signal that can be used for synchronizing the remote site equipment.

IP Module
Comtech EF Data modems enabled with the optional IP Module take bandwidth optimization to a higher level. Available features such as Payload Compression, Header Compression and Quality of Service (QoS) enable significant bandwidth savings, improve transmission quality and increase control of bandwidth provisioning.

RF Products
Comtech EF Data also offers an extensive line of RF products - converters, amplifiers, transceivers and terminals - for a range of configurations, which are deployed globally in commercial and government applications. Rugged platforms, field replaceable power supplies, redundancy and a variety of frequencies are just some of the options available in our extensive RF product line.