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RCS20 M:N Redundancy Switch
Introduction
Section 1 – Introduction
1.0 Description
The Radyne ComStream, Inc. RCS20 M:N Redundancy Switch provides backup
switching/protection for up to nine pairs of satellite modem channels (modulators/demodulators).
The RCS20 is a companion product to the Radyne DMD15/2400 family of Satellite Modems.
The RCS20 is comprised of three separate units that make up the switching system; the
Redundancy Control Unit (RCU20), the Digital Data Switch (DDS20) and the Intermediate
Frequency Switch (IFS20).
The RCS20 can be operated automatically, in which case an automatic backup of a failed online
modem occurs after a preprogrammed delay. The switch may also be operated manually, allowing
the operator to manually switch to a backup modem. Front panel controls and indicators provide for
auto/manual configuration, as well as display of online/off line status information for all modems in
the redundancy configuration.
Figure 1. RCS20 M:N Redundancy Switch
1.1 Digital Data Switch (DDS20)
The DDS20 provides all of the data interconnections between the online and backup modems. The
DDS20 also provides buffering of terrestrial data signals to backup modulators allowing 'hot-standby'
modes of operation. The DDS20 receives control and DC power through an interconnecting cable
from the RCU20.
1.2 Intermediate Frequency Switch (IFS20)
The IFS20 Intermediate Frequency Switch interfaces the IF signals of the modems with the Earth
Station IF system and provides backup switching. The unit provides all of the switching relays,
signal splitters and terminations 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.
1.3 General Information
Every attempt has been made to include all of the information that is necessary to properly operate
the RCS20. However, although basic information is included on theory of operation and
TM056 – Rev. 2.3
1-1
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