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Aprisa SRx User Manual 1.3.0
Switching Criteria
The Protected Station will switch-over operation from the active to the standby radio if any of the
configurable alarm events occur, or if there is a loss of the ‘keep alive’ signal from the active radio.
It is possible to configure the alarm events which will trigger the switch-over. It is also possible to prevent
an alarm event triggering a switch-over through the configuration of blocking criteria.
Any of the following alarm events can be set to trigger or prevent switching from the active radio to the
standby radio (see ‘Events > Events Setup’ on page 167).
PA current
Tx reverse power
Tx AGC
Temperature threshold
Thermal shutdown
RSSI Threshold
RX Synthesizer Not Locked
Rx CRC errors
RF no receive data
Port 1 Eth no receive data
Port 2 Eth no receive data
Port 1 Eth data receive errors
Port 2 Eth data receive errors
Port 1 Eth data transmit errors
Port 2 Eth data transmit errors
Port 1 Serial Data No RX Data
USB Port Serial Data No RX Data
Port 1 Serial Data RX Errors
USB Port Serial Data RX Errors
Component failure
Calibration failure
Configuration not supported
Protection Hardware Failure
Alarm Input 1
Alarm Input 2
It will not attempt to switch-over to a standby radio which has power failure.
It will also not switch over to a standby radio with an active alarm event which has been configured as a
‘blocking criteria’.
Switch-over will be initiated once either of these conditions is rectified, i.e. power is restored or the
alarm is cleared.
