NETWORK INTERFACE ADAPTERS / CONVERTERS

• Audio Balanced / Unbalanced

• Analogue to Digital

• Digital to Analogue  

• AES / G.703

• ASI / ASI

• ASI / SPI

• ASI / G.703

• Ethernet / ASI
   

DAC-3440 & 3450 AES/EBU / G.703 (2 Mb/s) Network Interface Adapter

General

The DAC-3440, together with the DAC 3450, forms a transmitter/receiver system, which is designed to allow an AES/EBU digital audio signal to be distributed via the phone network.
The DAC-3440 converts an AES/EBU digital audio signal into a non-framed G.703 compatible signal.
The DAC-3440 combines the 20 bit audio data with either C data or U data into an output stream at 2.048 Mb/s. This stream is then output as a standard G.703 HDB3 encoded 75Ω unframed signal.
The DAC-3450 converts a G.703 signal, whose content is formatted as per the output of the DAC- 3440, to an AES/EBU data stream. The receiver obtains synchronism with the incoming stream and then separates the audio data from the combined C (or U) data.
The DAC-3450 allows a local reference AES/EBU signal to be input for rate synchronization of the output. With no reference signal present, output rate is automatically set to 48 kHz

The system can handle mono or stereo 20 bit AES/EBU audio at any rate from 25 KHz to 55 kHz, although it is designed for a nominal 48 kHz.
The system also allows either the Channel (C) or User (U) data to be conveyed.
Front panel LEDs indicate when an AES/EBU signal is present and when the input AES/EBU signal sample rate is 48 kHz on the DAC-3440, and when a valid 2.048 Mb/s G.703 input signal is present and when a valid AES/EBU reference signal is applied to the DAC-3450.
A relay output is provided on each of the rear assemblies for remote status indication for when a valid AES/EBU signal is present or invalid.
The DAC-3440 is fabricated in IRT's standard Eurocard format and may be housed in a variety of IRT Eurocard frames alongside other standard modules.

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