Adding to the above list of 'uses for CAT5e/6 cables'.....
From Prolight+Sound 2013, RME launches new product with media conversion to and from twisted pair on RJ45's. MADI, AES3, and ADAT over twisted pair....
http://www.rme-audio.de/en_index_new_products.php
Also, my converters shown above are currently running on 2 x 300' of LK CAT6 UTP. The LK cable is outstanding, if you need it.