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

CRS-170 1:1 Redundancy Switch Revision 1
Installation and Operations Manual MN/CRS170.IOM
23
Chapter 3. FUNCTIONAL DESCRIPTION
The CRS-170 L Band 1:1 Switch module performs the transmit and receive coaxial
switching required for redundant modem operation with an outdoor BUC and LNB. It
switches all of the BUC and LNB interface signals that are multiplexed onto the transmit
and receive coaxial cables:
• Tx and Rx L-Band signals
• 10 MHz reference to BUC and LNB
• DC Power to BUC and LNB
• FSK signaling to the BUC
Operation with two CDM-600L modems requires an additional CRS-150 1:1 switch for
terrestrial data switching and 1:1 control, while operation with two SDM-300L3 modems
requires an additional SMS-301 1:1 switch to handle terrestrial data and control. Thus,
there are three functional configurations for the CRS-170.