At 08:53 AM 10/13/98 -0700, you wrote:
>Does anybody know what the electrical characteristics of Ethernet
>(10base-T) are? I'm using an RJ-45 plug in my PIC device because I need 7
>conductors and they're cheap and durable, and I want to choose which
>wires go to what such that if Mr. Curious plugs an ethernet network into
>my box it won't let the magic smoke out.
>
>I found a cabling diagram that tells me which pins carry data, but I have
>no idea what the voltages are. It also seems there should be a signal
>ground and perhaps a power pin in there somewhere, but the cabling
>diagram showed only 4 data signals (Tx +/- and Rx +/-).
>
>Any pointers to this information would be appreciated.
>
>Dave Johnson
>


Standard 10BaseT requires only four wires.  We've actually run two 10BaseT
lines in one RJ 45 connector.

John Hansen