User's Manual

Product Options | 25
Aprisa SR+ Product Description
Operation
In hot-standby normal operation, the active radio carries all RS-232 serial and Ethernet traffic over the
radio link and the standby radio transmit is on with its transmitter connected to an internal load. Both
radios are continually monitored for correct operation including the transmitter and receiver and alarms
are raised if an event occurs.
The active radio sends regular ‘keep alive’ messages to the standby radio to indicate it is operating
correctly. In the event of a failure on the active radio, the RF link and user interface traffic is
automatically switched to the standby radio.
The failed radio can then be replaced in the field without interrupting user traffic (see Aprisa SR+ User
Manual).
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.
Configuration Management
The Primary and Secondary radios are managed with the embedded web-based management tool,
SuperVisor, by using either the Primary or Secondary IP address. Configuration changes in one of the radios
will automatically be reflected in the partner radio.
To ensure all remote stations are registered to the correct (active) base station, changes to the Network
Table are automatically synchronized from the active radio to the standby radio. The Network Table is
only visible on the active radio. This synchronization does not occur if the Hardware Manual Lock is active.