I was reading an article, (mabey linked from another thread) on the history of Quad wire, and it described just that. Red and green for the phone, and black yellow as power for a lighted phone. Not sure if it can still be done..... But it was done at one point in history. (I'm a young guy, 35, and wouldn't know when that stopped. [Linked Image] But have not seen it in my career.)
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Oh wait, some KSU, and PBX systems send power ad data/signaling on other pairs.

[This message has been edited by e57 (edited 01-28-2005).]

Mark Heller
"Well - I oughta....." -Jackie Gleason