Appendix B Redundancy; Redundancy Operation; 1:1 Mode - Comtech EF Data C Installation And Operation Manual

B.1 R
EDUNDANCY
The HPOD C-/Ku Band Outdoor Power Amplifiers can be used in a redundancy
configuration by connecting the appropriate 1:1 or 1:2 redundancy cable to the
Redundancy Loop (Connector J4). The mode of redundancy will be automatically
detected by the cable that is installed by the user. The system configures automatically
upon detection of the redundant loop cable. This redundant loop cable has internal
connections that allow the SSPAs to both detect the cable and establish their position
corresponding to the label on the cable (SSPA 1 or 2 for a 1:1 system; 1,2, or BU for a
1:2 system)
B.2 1:1 M
ODE
In 1:1 redundancy mode, the unit that is currently not the active unit (determined by the
switch position) will be the controlling backup unit. The serial command "RAM"
determines system operation. If RAM=1 in both units, the system will be in "AUTO"
mode. In this mode, if a fault is detected with the active unit, either by loss of
communications between the offline and online unit, or via the summary fault, the
backup(offline) unit will switch the waveguide switch and become the active(online) unit
(assuming the backup unit is not faulted).
The RAM serial command can be used to put the system in "MANUAL" mode. With
RAM=0 set in both units, the system is set to manual redundancy mode and no
switchovers will occur upon fault detection. The switch position is determined by the
value sent in the SSW command(SSW=1 sets the switch to put SSPA 1 online, SSW=2
sets the switch to put SSPA 2 online).

Appendix B REDUNDANCY

O
PERATION
B–1