Just about the only things that caught my eye at the recent Beyond HD Masters day at Bafta was Sony's IP Live system. This is a single product called the NXL-IP55 which puts four 1080i 4:2:2 signals over a gigabit connection - so modest 6:1 compression with a well-defined single field of latency. The camera channels can go either way (so three source cameras and a return preview monitor for example) and embedded audio plus tally & camera head (colour) and lens control are included. It's quite expensive ($10k per end) but is the only video-over-IP device which I've seen so far which is suitable for live production.
http://www.sony.co.uk/pro/press/pr-sony-nab-av-over-ip-interface
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