Comtech CDD-562AL IP Demodulator

Description

The Comtech CDD-562AL IP Demodulator is Comtech’s next generation integrated IP demodulators providing industry leading performance in a 1 RU package at a competitive price. The Comtech CDD-562AL IP Demodulator is designed to receive up to four independent 70/140 MHz or L-Band channels (depending on model) and combine the receive data into a single 10/100BaseT Ethernet port for transmission onto the LAN. The Comtech CDD-562AL demodulator is designed to operate with Comtech EF Data’s CDM-570/L-IP and CDM-570A/L-IP IP-enabled modems.

Comtech IP Demodulators Network Topologies
The CDD-562AL and CDD-564A/L are intended for use as hub receivers for Hub Spoke networks consisting of a shared outbound carrier with multiple return carriers from remote sites. The CDD-562AL and CDD-564A/L simplify hub deployment by reducing rack space and costs by providing two and four independent demodulators respectively in a 1RU chassis. At remote sites, the CDD-562AL or CDD-564A/L is used to enable single hop mesh connectivity between remote sites. Operating in mesh topology with direct connectivity between sites eliminates double-hop through the hub, thereby conserving bandwidth and reducing latency.

Quality Of Service (QoS)
The CDD-564A/L and CDD-562AL transparently pass the QoS prioritisation established at the transmit end by the CDM-570/A/L-IP Satellite Modem.

Comtech CDD-564A Header Decompression Option
Header compression reduces the bandwidth required for Voice over Internet Protocol (VoIP) by as much as 60%. Example: A G.729 voice codec, operating at 8 kbps, requires 32 kbps bandwidth once encapsulated into an IP/UDP/RTP frame. With IP/UDP/RTP header compression, the same voice call needs only 10.8 kbps total WAN satellite bandwidth. Typical Web/HTTP traffic can be reduced by 10% via IP/TCP header compression. Each demodulator can be independently configured for header decompression.

Comtech VersaFEC Forward Error Correction
VersaFEC is a patent-pending system of high-performance low latency LDPC codes designed to provide maximum coding gain while minimising latency. CDD-564A/L and CDD-562AL support VersaFEC’s Constant Coding & Modulation (CCM) mode of operation.

Comtech Vipersat Management System Integration
A Vipersat powered network integrates these advanced demodulators with a powerful network management tool, the Vipersat Management System (VMS). In addition to the traditional Monitoring and Control of the CDM-570A/L-IP modems and the CDD-564A/L and CDD-562AL demodulators, the VMS allows these devices to share bandwidth, and when needed, switch automatically to a dedicated SCPC channel on demand.
VMS provides for dynamic bandwidth allocation while in SCPC mode, automatically altering the bandwidth based on traffic conditions. This effectively enables the network to better handle connection oriented applications and reduce network congestion, jitter and latency. The VMS also allows for dynamic point-to-point mesh connections to be established between remotes.

Comtech EF Data Corporation is a leading supplier of satellite bandwidth and link optimisation. Our high-performance satellite communications infrastructure solutions feature groundbreaking efficiency, robust intelligence and unparalleled horsepower. Commercial and government users around the world utilise our solution suite to reduce OPEX/CAPEX and to increase throughput for the most demanding fixed and mobile networks.

Comtech offers Satellite Ground Station Technology including satellite earth station products such as a single channel per carrier (SCPC) modems, Advanced VSAT modems, and satellite based travelling wave tube amplifiers (TWTAs). Comtech participates in a number of growth markets including satellite based cellular backhaul, HD television broadcast, and in-flight connectivity.