>WOW, you guys are really into feature creep!!
>More like a feature race! ;-)

<VBG>

>KISS! Use a plain ol' CV wall wart and a series resistor
>to the twisted pair, LED on the other side,

OK, but we can add a feature to this ;))))))))))

Use an AC output wall wart, then at the receiving end have an LED and an 
optoisolator, with the LEds wired back to back. That way you have a visual 
indicator as well as an isolated input into the next step. 

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