Comtech EF Data CDM-625 - Manual (Page 37)

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Chapter 1. INTRODUCTION
1.1 Overview
Figure 1-1. CDM-625 Advanced Satellite Modem
The CDM-625 Advanced Satellite Modem (Figure 1-1) is intended for both closed network and
legacy Intelsat applications. The unit is a replacement for the CDM-600 and CDM-600L Open
Network Satellite Modems, and it includes many new or enhanced features:
• It is compact – 1RU high and 17.6 inches deep – and consumes only 48W (typical).
• It features front panel LED Indicators, a keypad, and a Vacuum Fluorescent Display (VFD) for
local configuration and monitoring and control (M&C). It also can be fully remote-controlled
through its serial remote control or Ethernet-based Web Server (HTTP) and Telnet
Command Line interfaces.
• It provides a full range of built-in (i.e., no plug-in cards required) traffic data interface
types, including all G.703 types, Quad E1 Drop and Insert, HSSI, and ASI.
• Its IF frequency range simultaneously covers 50-180 MHz and 950-2000 MHz.
• It offers variable data rates, from 18 kbps to 25 Mbps, in BPSK, QPSK, Offset QPSK (OQPSK),
8PSK, 8-QAM and 16-QAM modes. Viterbi, Sequential, concatenated Reed-Solomon (RS),
Trellis Coded Modulation (TCM), Turbo Product Coding (TPC), Low-density Parity Check
Coding (LDPC), and VersaFEC ® (short-block, low latency LDPC) are provided as Forward Error
Correction (FEC) options.
• It is compliant with IESS-308/309/310/315 specifications, but also adds other significant
features in closed network modes.
• Its demod design incorporates fast acquisition, improved composite power handling, and an
integrated adaptive equalizer.
• It includes VersaFEC Adaptive Coding and Modulation to increase capacity on IP links.