EtherSound is an industry-standard, low latency digital audio networking system using off-the-shelf Ethernet components and invented by Digigram.
List of tested switches, cables, media converters
http://www.ethersound.com/technology/compatibility.php
http://www.AuviTran.com/www/index.php?page=avdm-es
http://www.ethersound.com/products/getinfo.php?eprod_key=3800