1–1
Chapter 1. INTRODUCTION
1.1 Overview
Figure 1-1. CDM-570/570L Satellite Modem
(CDM-570L shown)
The CDM-570L and CDMR-570L Satellite Modems (Figure 1-1) are int
ended for closed network
L-band applications. The CDM-570 Satellite Modem is the 70/140 MHz IF version of the same
modem. Apart from the IF frequency band, the three modems (referred to collectively as the
CDM-570/570L) are essentially identical.
Note the following:
• The CDM-570/570L offers variable data rates from 2.4 kbps to 9.98 Mbps, in BPSK,
QPSK, Offset QPSK, 8-PSK, 8-QAM, and 16-QAM modes.
• The CDM-570/570L provides, as Forward Error Correction (FEC) options, Viterbi,
concatenated Reed-Solomon (R-S), Trellis Coded Modulation (TCM), and Turbo Product
Coding (TPC, IESS-315 compliant).
• The CDM-570/570L provides a full range of built-in interface types, including G.703 T1
and E1 (note that G.703 operation is optional after 10/2009).
• The CDM-570 IF frequency range covers 50 to 90 and 100 to 180 MHz.
• The CDM-570L IF frequency range covers 950 to 2000 MHz. and supports external
Block Upconverters (BUCs) and Low-Noise Block Downconverters (LNBs). An optional
BUC power supply, up to 150 Watts @ 50°C and 180 Watts @ 30°C, may be installed
internally. 10 MHz reference signals are available to drive both BUC and LNB. LNB
power and FSK for ‘smart’ BUCs is standard.
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