Where I work, we spent a fortune on a Klotz digital audio distrubution system, German designed, and used in a lot of radio stations the world over.  Its been fantastic.  We have 10 studios, and hundreds of audio sources and destinations - the system routes it all wherever we want without degradation or noticable delay.  In fact, upon a single core of fibre cable can travel 256 channels of 24bit 48kHz stereo audio.  It's really cool.