HPOD C-, X-, Ku-Band High-Power Outdoor Amplifier Revision 6
Appendix B MN/HPOD.IOM
B–3
B.1.2 1:2 Redundancy Mode
FigureB‐1showstheblockdiagramforanHPOD1:2RedundancySystem(forthepurposeof
example,aC‐Bandsystemisshown).
Figure B-1. HPOD C-Band 1:2 Redundancy System Block Diagram
In1:2 redundancymodethere isa dedicated BackupUnit(designated asBU) asdeterminedby
the cable position. In
this configuratio
n, the BU is responsible for monitoring the two online
unitsforcommunications andsummaryfaults.
WhiletheBUisconstantlymonitoringbothunitsfortheirstatus,ifeitherhasafault,usethelast
(good) status as the configuration for the BU before the BU goes online. Once the BU goes
online, the r
edundancy auto/manual status reverts to manual mode, and the BU stays online
untilresetbytheuser.
The usermay reset thesystemby issuing a FBU=0 command to place theunitsback into auto
mode.Whenissuingthiscommand,theBUthenswitchesbacktothe“normal”configuratio
nof
SSPAs 1 and 2 online. The system can be operated manually by sending an FBU=1 command
(whichforcesSSPA1tobebackedup),oraFBU=2command(whichforcesSSPA2 tobebacked
up)totheBU.
In1:2applications,theBUalsostoresanoffsetvalue,tobeusedwhentheBUreplacesan ac
tive
unit,foreachofthetwoonlineunits.ThisoffsetmaybesetwiththeSBO=command.Whenan
onlineunitisbeing“backedup”theBU’sattenuatorwillbesettothis value.Thisvaluemaybe
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