Redundant Configurations; 1:1 Redundant Systems - Comtech EF Data UT-4579 Installation And Operation Manual

UT-4579 X-Band Up Converter MN/UT4579.IOM
Appendix A Revision 1
The TSM contains IF and RF transfer switches for input/output looping of the
signal. Options for the TSM include Type 'SMA' female connectors for the RF
output signal, and 50Ω or 75Ω BNC female connectors for the IF input.
The "Daisy Chain" configuration is designed to chain the IF input and RF output of
up to twelve (12) online converters through TSMs terminating in a BU. When a
fault occurs in an online converter, the system commands the TSM in the faulted
converter to switch to the BU.
A.3 Redundant Configurations
You may configure the UT-4579 Up Converter in a variety of subsystem "Daisy
Chain" configurations to suit the reliability requirements of your communication
system. These configurations include 1:1 or 1:N Redundant Systems.
A.3.1

1:1 Redundant Systems

A 1:1 Redundant System can be either a Single Source or a Dual Source IF Output
Configuration.
In a Single Source IF Output Configuration: Figure A-1 shows the cable
connections between the converters. Figure A-2 shows the diagram for this 1:1
redundant converter configuration.
The online converter uses an RF and IF 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 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 BU.
In a Dual Source IF Output Configuration: Figure A-5 shows the cable
connections between the converters. Figure A-6 shows the diagram for the 1:1
redundant/dual source RF input/converter configuration.
Two IF inputs – IF Input #1 (priority) and IF Input #2 – are switched in the 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 #01
A–3