PreSonus FIREstation - Manual (Page 34)

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8.1 TROUBLESHOOTING
8.2 The ADAT Input/Output Doesn’t Support Optical S/PDIF
The ADAT input/output does not support optical S/PDIF. Optical
S/PDIF is characterized by utilizing two channels, rather than eight.
S/PDIF is carried by a pair of coaxial (RCA-style) plugs on the breakout
cable.
8.3 Pops, Clicks, And/Or Distortion Are Present In The Audio
Signal
Pops, clicks and distortion on the fiber optic I/O may be caused by
Word Clock discrepancies. Word Clock problems arise when the digital
frame rates of two devices are not aligned. In order for two or more
digital devices to be properly aligned only one device can be set as
master. Word Clock allows other deices to be synced or ‘chained’ to
this device. In other words, the ‘chained’ devices are set as slaves.
(Similar to a MIDI daisy-chain). The BNC connectors allow one unit to
be slaved to another unit, which is one way to sync two or more digital
devices. Another way to sync digital Word Clock devices is through the
Word Clock signal that is carried either by the S/PDIF I/O or the ADAT
I/O.
8.4 ADAT I/O Cannot Be Used In Conjunction With The Line Or
S/PDIF I/O
The ADAT I/O cannot be used at the same time as the line or S/PDIF
I/O. For example, ADAT channels one-six and S/PDIF cannot be used
simultaneously. However, you can use the ADAT inputs and the Line
outputs at the same time. In this instance the line outputs will mirror
the ADAT inputs.