DAI-4 |
The DAI-4 contains dual 24 Bit A/D and D/A converters with software configurable analogue
I/O stages to interface two bi-directional audio channels onto a pair of fibre optic links.
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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. |
Analogue Inputs |
Dual analogue line level inputs are provided on screw terminal connector for easier connection |
Analogue Outputs |
The two analogue 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. |
Data I/O |
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 operation.
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System Interconnections |
Audio In |
Two separate balanced audio line inputs on screw terminals. |
Audio Out |
Two separate balanced line level outputs . An adjustable 20KHz surveillance tone can be mixed with the program audio for use with external fault monitoring systems |
Transmit |
Twin ( Primary & Secondary ) ST fibre connectors for the outgoing fibre connections to other elements of the system. Each output carries the same audio information but separate control data to allow automatic fibre network verification & tests. The system is software configurable for single or dual fibre operation. |
Receive |
Twin ( Primary & Secondary ) ST fibre connectors for the incoming fibre connections from other elements of the system. The system is software configurable for single or dual fibre operation with correct operation verified and reported. |
Control |
A multifunction port allowing the connection of:-
1. PTT push button for page access,
2. Control keypad for selection of up to 24 paging zones,
3. Outputs to remote amplifier page access,
4. Outputs to remote routing matrix,
5. Transparent serial data for other communications & control.
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Status |
For connection to external fault monitoring systems. The port carried four
configurable status lines to verify the operation status of:-
1. Connected microphone & internal processing,
2. Single or dual fibre network,
3. Power supplies,
4. Remote peripherals.
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Power |
Dual power inputs are provided from both mains and 24V DC. The status of
both can be monitored and any deviation from normal operation flagged as a
fault. |
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