> I would move the power to the other end of the cable if possible (you
> could use a 5V wallwart at the computer end and run it through a
> separate pair, with just a cap on the remote end).  Better if you can
> put the wallwart at the remote end too (minimise crosstalk).

ah OK - so make the Vcc a 'loop'? hadn't thought about that.

In my case it's all powered via a PoE splitter
(http://www.tp-link.com.au/products/details/?categoryid=234&model=TL-POE10R
) which drives a headless raspberry-pi @5v with a DS2482-100 hanging
off the I2C bus (http://www.sheepwalkelectronics.co.uk/RPI2.shtml) -
sadly no chance of a wall-wart to the area (hence why all coming off a
PoE feed)

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