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Digital I/O Formats
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
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.
Symphony I/O - User's Guide
Page 76
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