Chapter 1. Introduction; Overview; Figure 1-1. Cdm-625 Advanced Satellite Modem - Comtech EF Data CDM-625 Installation And Operation Manual

1.1

Overview

The CDM-625 Advanced Satellite Modem (Figure 1-1) is intended for both closed network and
legacy Intelsat applications. The CDM-625 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 48 watts (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
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.

Chapter 1. INTRODUCTION

Figure 1-1. CDM-625 Advanced Satellite Modem

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(short-block, low latency LDPC) are provided
1–1