Digital Hiss Noises via Toslink

My audio interface is from the digital outs on the G5 to a Rosetta 200. While using the audio core drivers for Logic Pro, Abelton Live, Reason and Garage Band, I am hearing a hiss noise from the digital I/O via toslink.
There is not much feed back regarding the matter, but does anyone knows anything about hiss noises from the G5?
Any in put would be appreciated.
Daz
Mac OS X (10.4.7) Dual G5, Logic Pro7, Rosetta 200

what was the resolution?

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