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1.1
Overview
The CDM-625A Advanced Satellite Modem (Figure 1-1) is intended for both closed network and
legacy Intelsat applications. It serves as the replacement for the CDM-625 It is 100% backwards
compatible with the CDM-625, but incorporates new features and expansion capability.
•
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),
SNMP or Telnet Command Line interfaces.
Compared with the CDM-625, additional front panel LEDs are incorporated that permit a
clearer visual indication of the status of the unit.
•
It provides a full range of built-in (i.e., no plug-in cards required) traffic data interface
types, including EIA-530/422, all G.703 types, Quad E1 Drop and Insert, HSSI, ASI, and
10/100 Ethernet.
•
Its IF frequency range simultaneously covers 50-180 MHz and 950-2250 MHz. The
extension to 2250 MHz is to address the needs of future high-throughput satellites (HTS).
•
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.
Chapter 1. INTRODUCTION
Figure 1-1. CDM-625A Advanced Satellite Modem
®
(short-block, low latency LDPC) are provided
1–1
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