As has been stated before, DMX over Ethernet is still proprietary to each individual lighting manufacturer. While the most common Art-Net, freely open licensed by Artistic Licence is true TCP/IP, every manufacturer recommends only lighting being on any one network. ACN is supposed to change that, but I'm still not convinced running pyro, motion control, or any other life safety/mission/time critical data being run over ethernet is a good thing. Art Net supports up to 64 Universes of 512 channels each, and the grandMA has been tested up to that, via 16 NSPs. The September issue of Lighting&SoundAmerica has an excellent article on ACN and ETC's implementation, by John Huntington, author of Control Systems for Live Entertainment, Third Edition. Focal Press, 2007. (Shameless plug for my friend John).
Gafftaper, the new Martin Stagebar54 LED striplight has only RJ-45 connectors, but currently is a DMX-only fixture. So you need an A5M-to-RJ45 adaptor at the beginning, then you can daisy-chain using CAT5 cables, then need an RJ45-to-A5F at the end to terminate or continue to standard moving lights. ColorKinetics/Phillips ColorBlaze48 and 72 striplights allow you to use all CAT5 cables, but only with a proprietary controller.
Gafftaper, the new Martin Stagebar54 LED striplight has only RJ-45 connectors, but currently is a DMX-only fixture. So you need an A5M-to-RJ45 adaptor at the beginning, then you can daisy-chain using CAT5 cables, then need an RJ45-to-A5F at the end to terminate or continue to standard moving lights. ColorKinetics/Phillips ColorBlaze48 and 72 striplights allow you to use all CAT5 cables, but only with a proprietary controller.