The PM3 also uses G.703. I assume you mean they delivered it unbalanced,
75 ohm, on a BNC connector? Then you need a balun. For example see
http://www.blackbox.co.uk/prodinfo/docs/15987.pdf
Or call your telco and ask them to provide the line balanced (120 ohm,
RJ45) instead of unbalanced. Most of the time they will do that.
Mike.
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