1.1.2 Antenna Side Connectors; Functional Description; Figure 1-3. Crs-170A - Antenna Side Connectors And Ground Lug - Comtech EF Data CRS-170A Installation And Operation Manual

CRS-170A L-Band 1:1 Redundancy Switch
Introduction

1.1.2 Antenna Side Connectors

Two 50Ω female Type 'N' connectors on the antenna side of the CRS‐170A L‐Band 1:1 Redundancy
Switch module provide the coaxial cable connections to the outdoor transmit and receive equipment
(BUC and LNB). Refer to Figure 1‐3 and its accompanying table for details (this image depicts the Rev.
A and later versions of the CRS‐170A).
Type 'N' Connector
RX
TX
Figure 1-3. CRS-170A – Antenna Side Connectors and Ground Lug
1.2

Functional Description

The CRS‐170A L‐Band 1:1 Redundancy Switch module performs the Tx and Rx 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 Tx and Rx 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.
Reference Description
RF Input
J7 LNB 10 MHz Ref
LNB Power
RF Output
BUC 10 MHz Ref
J8
BUC FSK
Comm.
1–4
Revision 9
MN/CRS170A.IOM
Direction
In
Out
Out
Out
Out
In/Out
Out