AVR-Chat

I would like to use standard shielded Cat 5/6 cable to carry I2C signals
between boards, i.e., between microcontrollers on separate boards.
Distances are not the question here, because if they end up a factor I'll
just use a PCA9517 buffer or something similar, but should someone ask they
will be of the order of a few to several feet.

The question is rather what conductors of the four twisted pairs should I
use?   At first, without thinking about it much I thought just use a single
twisted pair for both SCL & SDA, but after thinking about it further for a
few minutes, I now think that might be a bad idea, because SCL & SDA do not
comprise a single differential signal.

So now I'm thinking they should be on separate twisted pairs.   Perhaps with
GND as the other half of each pair.

I'd appreciate any help on this. 

Thanks, Steve
 

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