Comtech EF Data UT-4579 - Manual (Page 49)

UT4579 X-Band Up Converter MN/UT4579.IOM
Redundant System Operation Rev. 0
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A.3 R EDUNDANT C ONFIGURATIONS
Comtech EF Data UT-4579 Up Converters can be configured in several different
redundant subsystem "Daisy Chain" configurations to meet the reliability requirements of
a communication system. These configurations include:
Table 9. 4579 Up Converter Configurations
1:1 Redundant Subsystems
Single Source IF Input Configuration
The online converter uses an IF and RF transfer switch to switch the IF input and
RF output signals. A single switched IF input and RF output is provided to and
from the online converter. The transfer switches are contained in the Transmit
Switch Module (TSM) installed in the online converter. When a fault occurs in the
online converter, the TSM is de-activated to switch out the online converter, and
switch the IF input and RF 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 Input Configuration
Two IF inputs, IF input #1 (priority) and IF input #2, are switched in the Transmit
Switch Module (TSM) to provide redundant operation of the converters. The
converters provide two switched RF outputs, RF output #1 (priority) and RF output
#2. If converter #1 faults, converter #2 backs up the priority channel and IF signal
#2 and RF signal #2 are 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 IF input, converter configuration.
1:N Redundant Subsystems
IF and RF transfer switches in the TSM are used to switch the IF input and RF
output of a faulted online converter to the backup converter. The IF input and RF
output to the redundant converter subsystem is connected to online converter #N.
Figure 26 is an illustration of the cable connections between the converters.
Figure 27is a block diagram of this 1:N redundant "Daisy Chain" converter
configuration.