Comtech EF Data CDM-500 Specifications Page 16

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Rev. 1.3 1–1
1
Chapter 1.
INTRODUCTION
1.0 Introduction
The CDM-500 (Figure 1-1) is a very low-cost Closed Network Satellite Modem, intended
for VSAT applications. It offers variable data rates from 2.4 to 512kbps, in BPSK and
QPSK modes. It is extremely compact, being 1U high and 12 inches deep, and consumes
only 18 watts. It has a front panel VFD display and keypad for local configuration and
control, although it can be fully remote-controlled. For 1:1 applications the CDM-500 is
supported by a low-cost external switch, the CRS-100. For Hub applications, the CDM-
500 is supported by a low-cost 1:N switch, the CRS-200. Its fast acquisition time makes
it attractive for both demand-assigned and fixed-assigned SCPC applications.
Figure 1-1. CDM-550 Satellite Modem
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