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.

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.

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.

Engineering Specification


Analogue Input 1

Analogue Input 2

Type

Electronic Balanced

Electronic Balanced

Impedance

10K ohms, ( Optional Mic: 5K ohms )

10K ohms

Sensitivity

Mic: -50dB to -20dB Line: -10dB to +10dB

Line: -10dB to +10dB

Max input level

+8dB

+8dB

Attenuation Range

0dB to -48dB in 1dB steps and Mute

0dB to -48dB in 1dB steps and Mute

Outputs

Digital Audio Processing

Overall

Type: Electronic Balanced

A/D: 20 bit 64x oversampling

Freq. Resp.: 20Hz to 20KHz +/- 1dB

Impedance: 150 ohms

D/A: 20 bit 8 x oversampling

THD + Noise: < 0.08%

Max Level: +10dBu

Sample Freq.: 48KHz

S/N Ratio: Better than 63dB A Weighted.

Level Range: As Inputs