Product specifications

CRS-170A L-Band 1:1 Redundancy Switch Revision 3
Introduction MN/CRS170A.IOM
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 the accompanying table for details (this image depicts the
Rev. A and later versions of the CRS-170A; see Figure 4-1 for the original version).
Type ‘N’
Connector
Reference Description Direction
RX J7
RF Input In
LNB 10 MHz Ref Out
LNB Power Out
TX J8
RF Output Out
BUC 10 MHz Ref Out
BUC FSK In/Out
Comm. Out
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 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
1–4