# Configuring Digital I/O Formats

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## Using an 8 Analog + 8 AES/Optical I/O Module

The 8 Analog + 8 AES/Optical I/O Module allows the user to globally set the module's digital format to AES or Optical.

To set the format to AES, set the DIG I/O button on the modules rear panel to the down (or in) position.

To set the format to Optical, set the button to the up (or out) position.

After changing the digital format, Symphony I/O must be reset by powering down the unit, pressing the lefthand encoder while powering back up, choosing Reset All > Yes and pressing the righthand encoder.

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## Setting the Optical I/O Format

When using an optical I/O Module, set the format of the optical inputs and outputs to either ADAT/SMUX or S/PDIF using the Optical Format drop down menu, found on the Device Settings tab. The following format selections are available:

> ADAT - This format transmits 8 channels of digital audio over one Toslink (optical) cable at sample rates of 44.1 to 48 kHz. The ADAT format, originally found on Alesis ADAT digital recorders, is found on a wide array of digital devices such as keyboards, audio PCI cards and audio interfaces.

> SMUX - This format transmits 8 channels of digital audio over 2 Toslink cables at sample rates of 88.2kHz to 96kHz. The SMUX format,an extension of the ADAT format, allows the transmission of digital audio data at higher sample rates.

> S/PDIF - This format transmits 2 channels of digital audio over 1 Toslink cable at sample rates of 44.1kHz to 96kHz. S/PDIF optical format connections are often found on keyboards, CD players and other consumer audio devices.

## Using the S/PDIF Coax I/O

The S/PDIF Coax format transmits 2 channels of digital audio over 1 coaxial cable at sample rates of 44.1 to 192 kHz. S/PDIF Coax format connections are found on audio PCI cards, audio interfaces, digital effects units and CD players.

> S/PDIF Coax Input

> Symphony I/Oʼs internal architecture employs 16 channels of input and output per I/O Module. Since the S/PDIF Coax Inputs are the 17th and 18th inputs, itʼs necessary to replace a stereo pair of analog or digital inputs with the S/PDIF Coax Input in order for the S/PDIF Coax Input to appear on the Routing tab grid. Use the S/PDIF Coax Replaces drop down menu, in Maestro's Input tab, to select the analog or digital input pair to be replaced by the S/PDIF Coax Input pair.

> S/PDIF Coax Output

> The S/PDIF Coax Output is "tapped" from one of the other analog or digital stereo output pairs. Use the S/PDIF Coax Mirrors drop down menu, in Maestro's Output tab, to choose which analog or digital stereo output pair will be duplicated on the S/PDIF Coax Output.

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