Paradise Datacom 4 RU Chassis, Operation Manual

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4 RU SSPA Chassis Operations Manual 201627 REV X 57
Section 4: 1:1 Redundant System Operation
4.0 Introduction
This chapter describes how to configure and control a 1:1 redundant system, which
consists of two Teledyne Paradise Datacom SSPAs and a waveguide/coaxial switch.
Two RM SSPA units can be connected in a 1:1 redundant configuration, which can
automatically switch to an operating amplifier if the on-line SSPA develops a system
fault. In order to work in redundant mode, both SSPAs must be properly configured
and interconnected. Because both SSPAs have a microprocessor unit, an additional
controller is not required.
Two amplifiers can be connected to each other and to a waveguide/coaxial switch.
One of the amplifiers is designated as “on-line”; the other is designated as “standby”.
The on-line SSPA receives the input RF signal and transmits an amplified RF signal to
the RF load. The output of the standby SSPA is terminated at the dummy load.
Figure
4-1
shows a block diagram of a typical 1:1 Redundant System.
Two modes are available for the standby SSPA: “Hot” or “Cold” standby. An SSPA in
“Hot” standby mode remains fully operational (the preferred method). An SSPA in
“Cold” standby mode remains muted when off-line. This mode is only used where
prime power conservation is critical.
When the system is in “Auto” mode, if a summary fault develops in the on-line
amplifier, its state will be sensed by the standby SSPA through the link cable. If the
standby SSPA is in a non-faulted state, it will force the waveguide switch to reposition
and put itself into the online state. The process takes no more than 200 ms.
Figure 4-1: Block Diagram, 1:1 Redundant System