For critical systems the use of dual redundant fibres is included as is the injection
and verification of surveillance signals. Simultaneous monitoring, control & serial
data channels are embedded allowing a comprehensive digital interface & distribution
system to be easily implemented.
Dual audio line level inputs are provided on screw terminal connector for easier
The two audio balanced outputs are each fitted with programmable three band EQ, Level
and Mute. Both outputs can have an adjustable 20KHz surveillance tone mixed with
the audio signal.
Simple data connections to support selective paging ( for ring applications ) and
channel routing are incorporated accessible from the Control Port. A second port
allows the connection of a single RS232, RS422 or RS485 data channel with a maximum
baud rate of 38,400 to be carried transparently over the same network as the audio.
The system can be used in three basic operating modes:-
Point to Point ( with embedded data if required ), With the Audio Data Receiver for
multiple paging station interface to a distributed audio system, As a ring network
with selective paging,dual network redundancy and supporting dual master station
Dual network redundancy.
PTT push button for paging access
Control keypad for selection of up to 24 paging zones
Outputs to remote amplifier page access
Outputs to remote routing matrix
Transparent serial data for other communications and control
The DAI-4 is a fault tolerant dual channel audio transmitter / receiver using a dual
optical fibre system . It also provides a RS232/RS422/RS485 serial link and contact