Redundant Configurations; Table 9. 4572 Series Down Converter Configurations - Comtech EF Data DT-4572 Installation And Operation Manual

DT4572 X-Band Down Converter
Redundant System Operation
A.3 R
EDUNDANT
Comtech EF Data DT-4572 Down Converter can be configured in several different
redundant subsystem "Daisy Chain" configurations to meet the reliability requirements of
a communication system. These configurations include:
1:1 Redundant Subsystems
Single Source IF Output Configuration
The online converter uses an IF transfer switch to switch the IF signal. A single
switched IF output is provided to and from the online converter. The transfer
switches are contained in the Receive Switch Module (RSM) installed in the online
converter. When a fault occurs in the online converter, the RSM is de-activated to
switch out the online converter, and switch the IF output to the backup Converter.
Figure 21 is an illustration of the cable connections between the converters.
Figure 22 is a block diagram of this 1:1 redundant converter configuration.
Dual Source IF Output Configuration
Two IF outputs, IF output #1 (priority) and IF output #2, are switched in the
Receive Switch Module (RSM) to provide redundant operation of the converters.
The converters provide two switched IF outputs, IF output #1 (priority) and IF
output #2. If converter #1 faults, converter #2 backs up the priority channel and IF
signal #2 is not operational. Figure 24 is an illustration of the cable connections
between the converters. Figure 25 is a block diagram of the 1:1 redundant, dual
source RF input, converter configuration.
1:N Redundant Subsystems
An IF switch in the RSM is used to switch the IF output of a faulted online
converter to the backup Converter. Figure 26 is an illustration of the cable
connections between the converters. Figure 27 is a block diagram of this 1:N
redundant "Daisy Chain" converter configuration.
C
ONFIGURATIONS

Table 9. 4572 Series Down Converter Configurations

33
Rev. 0
MM/DT4572.IOM