Paradise Datacom 4 RU Chassis, Operation Manual

Page: 71 / 130

4 RU SSPA Chassis Operations Manual 201627 REV X 71
5.6.2 Setting SSPA’s Polarization priority
Polarization priority selection becomes very important in then case when two out of the
three SSPAs have developed summary faults. In this occasion, the remaining online
SSPA may redirect its output to support either polarization. This setting applies only for
HPA1 and HPA2. HPA3 has no physical ability to redirect its output to polarization 1
output due to obvious topological factors. The setting for HPA1 or HPA2 doesn’t have
to match and may be selected to suit the particular system needs.
To set SSPA polarization on any SSPA, follow steps below:
From front panel of SSPA, press “Main Menu” key;
Select item “6.Redund.” and press “Enter” key;
Select item “5.Priority” and press “Enter” key;
Select desired polarization priority: “1.Pol1” or “2.Pol2”;
5.7 Online/Standby Amplifier Selection
To determine the online state of a particular SSPA, check that the “Unit 1” button on
the front panel keypad (see
Figure 5-5
) is illuminated. To put an SSPA in standby
mode, press the “Unit1” key and the light should go off. If the system is in “Auto” mode,
the standby SSPA should accept an on-line state if cleared from a summary fault. The
“Unit1” LED on the standby SSPA will illuminate, indicating it is online and rotate the
waveguide switch(es) to the correct position to redirect its output power to the selected
polarity. If the standby SSPA doesn’t accept the online state, the first SSPA will revert
to the online state after 1 second.
The current SSPA’s polarity output selection can be monitored from the informative
menu of front panel display or through the remote control protocol. The standby SSPA
will indicate “None” as its priority selection. The on-line SSPA may indicate “Pol1” or
“Pol2”, depending on the current system state.
In Manual mode, the standby SSPA will always accept the online state regardless of its
own fault status.
The user can verify the state of the waveguide switches by browsing the informative
screen [3] on the front panel display. Items RFSW1 and RFSW2 will indicate the state
of the waveguide switches, as detected by the SSPA circuitry. If either switch position
cannot be detected, “Fault” will be displayed.
Figure 5-5: “Unit 1” Indicator from Front Panel