Comtech EF Data DT-4500-A Series - Manual (Page 149)

DT-4500-A Series Downconverters Revision 0
Appendix B MN-DT4500A
B–9
high-speed bus fault will result. This fault should clear when configuration is completed. At this
point, control of the redundant system is performed from the backup downconverter.
In a single polarity system set “POL=1” on all online units. In a dual polarity system, where the
BU has a Polarity Switch Module (PSM) installed, configure each unit to represent the RF feed it
is connected to POL=1 or POL=2. See Figure B-7.
B.4.1.2 Automatic Configuration Verification
Figure B-10 shows the system configured for automatic (A) operation. In this mode, failure of an
online downconverter will automatically cause a switchover to the redundant unit to occur. In
the field, the simplest way to test this mode is to turn off an online unit. The AUTO/MANUAL
selection is made in the downconverter. The online units will report their status as shown in
Figure B-10.
Figure B-10. System in Auto Redundant Mode