Comtech CDD-564ALEN IP Demodulator

Description

The Comtech CDD-564ALEN IP Demodulator is Comtech’s next generation integrated IP demodulator with 3xDES data decryption providing industry leading performance in a 1 RU package at a competitive price. The Comtech CDD-564ALEN 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 10/100Base-T Ethernet port for transmission onto the LAN. The Comtech CDD-564ALEN IP Demodulators are designed to operate with Comtech EF Data’s CDM-570/L-IPEN and CDM-570A/L-IPEN IP-enabled modems with 3xDES encryption.

Network Topologies
The CDD-562ALEN and CDD-564A/LEN 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-562ALEN and CDD-564A/LEN 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-562ALEN or CDD-564A/LEN 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.

Data Decryption
The CDD-562ALEN and CDD-564A/LEN support 3xDES data decryption to prevent unauthorized access to data over the satellite link.

Quality Of Service (QoS)
The CDD-564A/LEN and CDD-562ALEN transparently pass the QoS prioritization established at the transmit end by the CDM-570/A/LIPEN Satellite Modem.

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.

Payload Decompression Option
Implemented in the hardware for maximum throughput and efficiency, payload compression can typically reduce the required satellite bandwidth by 20-30%.

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 minimizing latency. CDD-564A/LEN and CDD-562ALEN 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-IPEN modems and the CDD-564A/LEN and CDD-562ALEN 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.