Comtech EF Data Corporation has now made available Adaptive Coding and Modulation (ACM) for the CDM-625 Advanced Satellite Modem.

The patent-pending and unique implementation of ACM is available for the CDM-625 when using the recently announced, nexgen forward error correction, VersaFEC. The combination of VersaFEC and ACM deliver significant lower latency benefits to VSAT users when compared to alternate implementations of ACM using DVB-S2. ACM turns fade margin into increased link capacity by automatically adapting the modulation type and forward error correction code rate to provide the highest possible throughput. ACM maximizes throughput regardless of link conditions. And, it can yield higher system availability even in severe rain fading conditions with lower throughput. VersaFEC was designed to provide maximum coding gain at the lowest possible latency for both Constant Coding and Modulation (CCM) and ACM operation. VersaFEC uses a constant number of symbols per frame. When compared to DVB-S2 ACM, which uses a constant number of bits per frame, the combination of VersaFEC and ACM provide a significant reduction in system latency. The new Comtech EF Data low latency ACM solution enables more bandwidth efficiency and increases throughput for IP-based point-to-point applications.