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Chapter 1. INTRODUCTION
1.1
Overview
Figure 1-1. CRS-180 70/140 MHz IF 1:1 Redundancy Switch
The CRS‐180 70/140 MHz IF 1:1 Redundancy Switch module, shown in Figure 1‐1, is a 50Ω,
70/140 MHz Tx‐Rx IF signal switch designed for use with IF satellite modems in a 1:1
configuration.
The Tx side switches the Online unit onto the transmit coaxial cable. The Rx side of the switch
uses power dividers to provide both demodulators with the same IF signal from the LNB, thus
reducing switching time.
The CRS‐180 is designed to support 1:1 redundancy for Comtech EF Data CDM‐625, CDM‐750,
CDM‐570, CDM‐700, CDM‐710, and CDM‐710G modems. Table 1‐1 summarizes the CRS‐180 1:1
IF Switch applications, including requirements for supporting data switching hardware and
software.
1–1
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