I am interested in developing a solution for running 10BaseT over a single twisted pair.
Is there something specific that you are trying to accomplish that HPNA will not do?
You can also easily run 10base2 over a single twisted pair for a short distance--all you need is a suitable pair of baluns.
Both Netgear (NetGear PE 102) and Linksys (Linksys HPB200) have in the past made ethernet to phoneline bridge devices that can accomplish essentially what you describe. They have an rj-45 and an rj11 on them. Plug your 10base-t (or 100base-t) ethernet into the rj45, and plug you plain old twisted pair phone wire in to to rj11. As an added bonus, you can run voice over the same pair at the same time!
Yes, for the application I have it would be nice to keep it a baseband solution, rather than modulating the signal up to a higher frequency.
And then there are the xDSL-based "Ethernet in the First Mile" solutions, which also run over a single UTP. The distances covered are much greater than the appr. 100m of 10BASE-T. Look for 10PASS-TS and 2BASE-TL at
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