Comtech EF Data DT-4500 Series - Manual (Page 68)

DT4500 Series Down Converters MN/DT4500.IOM
Redundant System Operation Revision 1
50
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 27.
A.3.2 A
UTOMATIC
C
ONFIGURATION
V
ERIFICATION
The backup Converter has a menu that allows the operator to choose, on a converter-by-
converter basis, manual (M) or automatic (A) operating mode.
Figure 30 shows the system configured for automatic (A) operation. In this mode, failure
of an online converter 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 converter. The online units will report their
status as show in Figure 30.
-CONVERTER-123456789ABC-
-AUTO/MAN--AAA-----------
POWER ON
TRANSMIT
REMOTE
ON LINE
FAULT
STORED FAULT
STATUS
POWER ON
TRANSMIT
REMOTE
ON LINE
FAULT
STORED FAULT
STATUS
POWER ON
TRANSMIT
REMOTE
ON LINE
FAULT
STORED FAULT
STATUS
POWER ON
TRANSMIT
REMOTE
ON LINE
FAULT
STORED FAULT
STATUS
FREQ= 12XXX.XXX-MHz-AUTO
ATTN= 10.00-DB---Tx=ON--
FREQ= 12XXX.XXX-MHz-AUTO
ATTN= 10.00-DB---Tx=ON--
FREQ= 12XXX.XXX-MHz-AUTO
ATTN= 10.00-DB---Tx=ON--
Figure 30. 1:3 System in AUTO Redundant Mode