On Mon, 12 Nov 2007 21:56:07 -0000, Graham. wrote:

I need to cut one unused cable out of a bunch of similarly looking
Ethernet cables.

Simple. Connect one of the wire pairs together then use a multimeter
set to the low ohms or continuity range to find the short circuit at the
other end of the cable.

So he knows which cable is the unused one at each end fine but I have a
feeling the OP want to know which that cable is somewhere in between the
two ends.

A cheap solution for the "tone & probe" is CPC part no: IN04456 £39.95 +
VAT or choose one of the kits from:

http://cpc.farnell.com/jsp/search/br...1002930+500001

TBH a tone and probe is probably the only way to accuratly determine which
cable is the unsused one in a bundle. When you think you have the right
cable tease it away from the others to make sure, you can mislead yourself
unless you are careful.

--
Cheers
Dave. pam is missing e-mail