The other commenters REALLY need to read the question before offering solutions!  The question was “How can I use the SAME WIRE for both Internet AND A/V distribution”.  The Gefen, Extron, Audio Authority etc. products will NOT share a Cat5 with internet data!  They take up the whole Cat5 and are point to point connections, they do NOT run through a router, switch, or any other network gear.

To my knowledge, the NetStreams system is the ONLY 100% TCP/IP audio/video distribution system.  It will distribute 1080i/720p HD video as well as uncompressed CD quality audio over a standard Cat5e network.  This would be the best system to use if you need to use the same Cat5 for data AND A/V distribution.

I agree with Dan that it is usually better to “segment” the network so that the A/V system and the network do not slow each other down, but in a modestly sized system, the Netstreams will co-exist just fine with other networked PCs, game consoles, etc.  In our showroom, I have the Netstreams system set up with HD distributed video (1080i), with 2 zones of audio, Lutron Lighting and a Panasonic IP camera integrated.  I have ZERO trouble using the internet on this network, either hardwired through the same switch, or wireless from the router.

One thing you should consider when looking at the price of the system is that there is no programming needed, unlike a more expensive Crestron or AMX system.  There is only simple configuration needed to be done by the installer.  This will save you THOUSANDS of dollars and ensure you are not tied to a company who will hold your system “hostage” with the source code.  This is not a trivial investment, but when you look at what the system can really do, and HOW it does it, I think you will agree that it is worth it!

If you would like to email me at .(JavaScript must be enabled to view this email address), I can put you in contact with a dealer in your area so you can see if this product is a good fit.

(Disclaimer, I work for AVAD, a distributor of Netstreams products)

NetStreams will do it but it’s not for tight budgets.

There are several one-cat5 baluns available now that will do Component+audio+control or HDMI.

If you have Cat5 + a coax to each room, you can use inexpensive baluns (i.e. Muxlabs) for the component video and left TV audio, then the coax as the right audio (or digital audio). Then use SONOS for the house audio as it runs on it’s own 802.11n mesh.

The Netstreams product does exactly this by sending uncompressed audio over ethernet to its speaker modules.

The also have a solution for encoding component video in realtime and streaming this across the network to a receiver.

It isn’t cheap but it might be the solution you are looking for.

Here is another possible answer.  Currently you can use a single Cat5 cable to send both an audio and high definition video signal.  Manufacturers such as Extron, Gefen, Audio Authority, and others, can send a high definition feed using your component video inputs and outputs (up to 1080p) as well as the audio signal (l/r composite, and some can even send digital audio).
Perhaps the solution can be using that signal Cat5 for both the audio and video to get that signal to your chosen destination, and then either (a.) using a wireless network to support the Internet functions in that room, or (b.) bringing a network cable into that room from an adjoining room.