4RF Aprisa SR Plus Product Description - page 28
26 | Product Options
Aprisa SR+ Product Description
Data Driven Protected Station
The Aprisa SR+ Data Driven Protected Station provides radio and RS-232 serial port user interface
protection for Aprisa SR+ radios.
Option Example
Part Number
Part Description
APSQ-D400-SSC-HD-22-ENAA
4RF SR+, PD, 400-470 MHz, SSC, Half Duplex, 2E2S, EN, AA
The Aprisa SR+ Data Driven Protected Station shown is comprised of two standard Aprisa SR+ dual antenna
port option radios and two external duplexers mounted on 19" rack mounting shelves (as shown above).
The Aprisa SR+ radios can be any of the currently available Aprisa SR+ radio frequency bands, channel
sizes or single / dual antenna port options.
By default, the Aprisa SR+ Data Driven Protected Station is configured with the left hand radio (A)
designated as the primary radio and the right hand radio (B) designated as the secondary radio.
Each radio is configured with its own unique IP and MAC address and the address of the partner radio.
On power-up, the primary radio will assume the active role and the secondary radio will assume the
standby role. If, for some reason, only one radio is powered on it will automatically assume the active
role.
Operation
In normal operation, the active radio carries all RS-232 serial and Ethernet traffic over the radio link and
the standby radio is unused with its transmitter turned off. Both radios are continually monitored for
correct operation and alarms are raised if an event occurs.
Both the active and standby radios send regular ‘keep alive’ messages to each other to indicate if they are
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.