What about BSS Soundweb, Avioms other A-Net products, and Hear Technologies?
These are specialized systems. BSS Soundweb networks signal processing devices together, configured in a ring network, transporting eight channels of 48K audio in each direction. See http://www.bss.co.uk/ for information on BSS Soundweb. Aviom’s monitor mix products are even more specialized, focused on providing an elegant product set that delivers very flexible monitor mixes to live performers. See http://www.aviominc.com/ for information on Aviom’s products. Hear Technologies, a division of Quantum Technologies, has introduced a smaller scale system for monitor mixes. They transport 8 channels of audio and power through a Cat 5E cable. It is worth noting that they also offer a single, inexpensive ADAT Lightpipe to Cat 5E converter for MSRP $69 (a pair is required) that will simply extend the reach of a single ADAT Lightpipe connection to 500 feet. See http://www.heartechnologies.com/ for more information on their products. Note that these technologies, like AudioRail, depart from st