As Patrick has suggested, and in the links in his post, 15m is achievable using good quality Category 2 HDMI cable. We have a number of rooms which are cabled exactly this way.
Another option for extending the HDMI (for further than 15m) is to use HDMI Extenders - these can carry the HDMI signal over standard Cat6 cable. We use these quite a lot in our newer deployments in large rooms, not only for the cameras, but also from the endpoint to the display panel(s). Note: they do also require power at each end. Use something like this: Extron HDMI Twisted Pair Extender.
Note: Your question would be better placed in the TelePresence section of the forums where these devices are more actively discussed than in the Video Over IP section you've posted in - I'd suggest, if the above hasn't answered your query, that you move your discussion over there.
Wayne
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Wayne
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