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CRS-170 1:1 Redundancy Switch
Installation and Operations Manual
CRS-170
1:1 Switch Module
The CRS-170 L-Band 1:1 Switch Module is an L-Band Tx-Rx signal switch designed for
use with L-Band satellite modems in a 1:1 configuration. The Tx side switches four
modem output signals that are multiplexed onto the transmit coaxial cable:
• 950-1950 MHz L-band transmit RF
• 10 MHz BUC frequency reference
• 600 KHz BUC FSK control and status communication
• BUC DC power supply
The receive side of the switch uses both power dividers and relays to provide the
redundant modem interface for three signals multiplexed onto the LNB coaxial cable:
• 950-1950 MHz L-Band RX RF from LNB
• 10 MHz frequency reference to LNB
• DC power supply to LNB
The CRS-170 is designed to support 1:1 redundancy for Comtech EF Data CDM-600L,
SDM-300L3, SNM-1001L, and SNM-1010L modems. Table 1 summarizes the
applications including requirements for supporting data switching hardware and software.
Chapter 1. INTRODUCTION
L-Band
15
Revision 1
MN/CRS170.IOM
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