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HPOD C-, X-, Ku-Band High-Power Outdoor Amplifier
Appendix B
B.1.2
1:2 Redundancy Mode
Figure B‐1 shows the block diagram for an HPOD 1:2 Redundancy System (for the purpose of
example, a C‐Band system is shown).
Figure B-1. HPOD C-Band 1:2 Redundancy System Block Diagram
In 1:2 redundancy mode there is a dedicated BackupUnit (designated as BU) as determined by
the cable position. In this configuration, the BU is responsible for monitoring the two online
units for communications and summary faults.
While the BU is constantly monitoring both units for their status, if either has a fault, use the last
(good) status as the configuration for the BU before the BU goes online. Once the BU goes
online, the redundancy auto/manual status reverts to manual mode, and the BU stays online
until reset by the user.
The user may reset the system by issuing a FBU=0 command to place the units back into auto
mode. When issuing this command, the BU then switches back to the "normal" configuration of
SSPAs 1 and 2 online. The system can be operated manually by sending an FBU=1 command
(which forces SSPA 1 to be backed up), or a FBU=2 command (which forces SSPA 2 to be backed
up) to the BU.
In 1:2 applications, the BU also stores an offset value, to be used when the BU replaces an active
unit, for each of the two online units. This offset may be set with the SBO= command. When an
online unit is being "backed up" the BU's attenuator will be set to this value. This value may be
B–3
Revision 6
MN/HPOD.IOM
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