User's Manual

32 | Product Options
Aprisa SR User Manual
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 146).
PA current
Tx AGC
Tx reverse power
Thermal shutdown
Temperature threshold
Thermal shutdown
RSSI Threshold
RX Synthesizer Not Locked
Rx CRC errors
RF no receive data
Port1 Eth no receive data
Port2 Eth no receive data
Port1 Eth data receive errors
Port2 Eth data receive errors
Port1 Eth data transmit errors
Port2 Eth data transmit errors
Port1 Serial Data No RX Data
Port1 Serial Data RX Errors
USB Port Serial Data No RX Data
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.