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RCS20 M:N Redundancy Switch
Introduction
1.3.3 Intermediate Frequency Switch (IFS20) Configurations
The IFS20 Intermediate Frequency Switch interfaces the IF signals of the modems with the Earth
Station IF system and provides backup switching. The RCU20 can be configured with or without
the IFS20. When the system does not require independent uplink and downlink ports, then the
RCU20 will monitor the status of the primary modem and ensure backup when a primary modem
faults.
When the system is configured with an IFS20, it will provide all of the switching relays and
optional signal splitters that are necessary to connect any combination of up to nine Modulators
and Demodulators to nine independent uplink and nine independent downlink transponders. The
IFS20 receives control and DC power through an interconnecting cable from the RCU20. The
IFS20 is available in the following three configurations:
1.3.3.1
70/140 IFS20
The IFS20 configuration is used for 70/140 MHz.
Figure 1-12 70/140 IFS20 Intermediate Frequency Switch – Front Panel
Figure 1-13 70/140 IFS20 Intermediate Frequency Switch – Back Panel
1–8
Rev. 14
MN-RCS20
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