4RF Aprisa SR+ User Manual - page 32
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Aprisa SR User Manual
Configuration Management
The active and standby radios are separately managed by SuperVisor via the Local and Partner IP
addresses. Changes to the configuration in one radio must be reflected in the partner radio.
Changes to the Network Table are automatically synchronized from the active radio to the standby radio
but the Network Table is only visible on the active radio. This synchronization does not occur if the
Hardware Manual Lock is active.
Switch Over
The switch over to the standby radio can be initiated automatically, on fault detection, or manually via
the Hardware Manual Lock switch on the Protection Switch or the Software Manual Lock from SuperVisor.
Additionally, it is possible to switch over the radios remotely without visiting the station site, via the
remote control connector on the front of the Protection Switch.
On detection of an alarm fault the switch over time is less than 0.5 seconds. Some alarms may take up to
5 seconds to be detected.
The Protection Switch has a switch guard mechanism to prevent protection switch oscillation. This guard
time will block another switch over with 20 seconds of the previous switch over. At the end of the guard
time period, the switching criteria will be evaluated and any protection switch will occur immediately if
necessary.
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 126).
PA current
Tx AGC
Tx reverse power
Temperature threshold
Thermal shutdown
RSSI threshold
Rx CRC errors
RF no receive data
Ethernet port 1 – no receive data
Ethernet port 1 – data receive errors
Ethernet port 1 - data transmit errors
Ethernet port 2 – no receive data
Ethernet port 2 – data receive errors
Ethernet port 2 - data transmit errors
Serial port – no receive data
Serial port – data receive errors
Component failure
Calibration failure
Configuration not supported
Switch over will not occur if there is a power failure or an active alarm event is detected on the standby
radio 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.