> As far as I got it the task/question was to use the Cat5-cables for analog
> music-signals (which is not a problem) and have a digital (modified or
> unmodified) WRT-router route the music to different ports or to produce the
> audio-signals on its ethernet-ports (which is a problem, i.e. not possible).

Yes...thts exactly wat my question is, a wrt box which can play songs but since it doesn't have speakers i want to use cat5 as the transport media.

Now my idea is to use the wrt as a decoder, an external DAC and the output of the DAC to the  speakers, and the question here is about the feasibility of such an arrangement, will it work?

PS: have a look at this http://www.duff.dk/wrt54gs/ the author hasnt quite explained how he did the hardware part and thats wat i am interested in, albeit doing it a bit differently.