DAC-3440, together with the DAC 3450, forms an AES/EBU / G.703 (2 Mb/s) transmitter/receiver system, which is designed to allow an AES/EBU digital audio signal to be distributed via the phone network.
DAC-3440 AES/EBU / G.703 (2 Mb/s) transmitter converts an AES/EBU digital audio signal into a non-framed G.703 compatible signal.
The DAC-3440 AES/EBU / G.703 (2 Mb/s) transmitter 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 75? unframed signal.
The DAC-3450 AES/EBU / G.703 (2 Mb/s) receiver 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 AES/EBU / G.703 (2 Mb/s) receiver allows a local reference AES/EBU signal to be input for rate synchronisation of the output. With no reference signal present, output rate is automatically set to 48 kHz.
The AES/EBU / G.703 (2 Mb/s) transmitter/receiver 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 AES/EBU / G.703 (2 Mb/s) transmitter/receiver 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 AES/EBU / G.703 (2 Mb/s) transmitter is fabricated in IRT Electronics' s standard Eurocard format and may be housed in a variety of IRT Eurocard frames alongside other standard modules.
- Conversion of AES/EBU audio to 2Mb/s G.703 for transport via telecom circuits
- Choice of 75ohms unbalanced or 110ohms balanced AES/EBU line connections
- 48 kHz 20 bit default sample rate, 25 – 55 kHz rates supported
- Optional external AES/EBU reference input for rates other than 48 kHz
- Allows Channel (C) or User (U) data to be conveyed
- IRT Eurocard format