Comtech EF Data CRS-170A - Manual (Page 21)

1–1
Chapter 1. INTRODUCTION
1.1 Overview
Figure 1-1. CRS-170A L-Band 1:1 Redundancy Switch Module
The CRS-170A L-Band 1:1 Redundancy Switch Module (Figure 1-1) is an L-Band Tx-Rx IF signal
switch. It is designed for use with Comtech EF Data L-Band satellite modems in a 1:1 redundant
(Online ‘A’ and Backup ‘B’) configuration.
The CRS-170A is compatible for use with the Comtech EF Data modem listed in Table 1-1. This
table also summarizes the CRS-170A 1:1 IF Switch applications, including requirements for
supporting data switching hardware and software.
The CRS-170A monitors the faults of the ‘A’ and ‘B’ modems and determines which modem
should be online. The data switch is built into each terrestrial data interface inside both modems
(excluding the CDM-600L [CLM-9600L] and SDM-300L3 modems, which require ancillary
switching devices).