Comtech CDD-564AL IP Demodulators

Overview

The CDD-564AL multi-purpose IP demodulators provide industry-leading performance in a 1 RU package at a competitive price. They are designed to receive up to four independent L-Band channels and combine the receive data into a single 10/100Base-T Ethernet port for transmission onto the LAN. The demodulators are designed to operate with Comtech EF Data’s CDM-570L/IP and CDM-570A/L-IP IP-enabled modems.

Features

• Independent demodulators
  • CDD-564AL: Four L-band demodulators
  • L-Band: 950 to 2250 MHz
  • 16 kbps to 23.5 Mbps data rate
  • BPSK, QPSK, 8PSK/8-QAM, 16-QAM demodulation
• VersaFEC® low latency LDPC forward error correction (Constant Coding & Modulation Mode)
• 2nd Generation Turbo Product Coding (TPC) forward error correction
• 5%, 10%, 15%, 20%, 25% and 35% Filter Rolloff
• Static IP routing for unicast and multicast
• Management via SNMP, Web or Telnet
• IGMP v1 and v2
• 10/100Base-T Ethernet data interface (RJ-45)
• 10/100Base-T Ethernet management interface (RJ-45)
• Firmware upgrade via FTP
• Front panel LEDs for unit status, stored event indicator, and the status of each receive channel
• LNB support: 10 MHz reference and LNB power
• Compatible with the CDM-570L/IP (TPC) and CDM-570A/L-IP (TPC or VersaFEC)

Network Topologies

The CDD-564AL is 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-564AL simplifies hub deployment by reducing rack space and costs by providing four independent demodulators in a 1 RU chassis. At remote sites, the CDD-564AL 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-564AL transparently passes the QoS prioritization established at the transmit end by the CDM-570A/L-IP 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.

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-564AL supports VersaFEC’s Constant Coding & Modulation (CCM) mode of operation.

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-564AL demodulators, the VMS allows these devices to be switched, when needed, and then switched automatically to a dedicated SCPC channel on demand.

VMS provides for dynamic bandwidth allocation while in SCPC mode, and for automatically altering the bandwidth based on traffic conditions. This effectively enables the network to handle connection negotiation and release and reduces network congestion, jitter and latency. The VMS also allows for dynamic point-to-point mesh connections between sites established between remotes.

Typical Users

• Enterprise
• Broadcasters
• Internet Service Providers
• Oil Field Service Providers
• Maritime
• Government & Military

Common Applications

• Disaster Recovery & Emergency Communications
• Enterprise
• Offshore & Maritime Communications
• Satellite News Gathering