Dave Liquorice wrote:

Andy Burns wrote:

Could someone have inserted a 6pin plug instead of 8pin? That might
force the contacts out of line.

Shouldn't do, the contact wires in the socket are normally guided to
keep them lined up, the plug also guides the wire for each of it's
contact positions. The two outer contact wires just won't be guided
quite as well by the plug.

But the edge plastic bits in what would be the 1 and 8 positions are
thicker as they have no guide in the positions that don't exist

If you look at a BT xDSL faceplate, even though it's wired for 6 pins as
it's for an RJ11, it's actually wider to allow an RJ45 to fit without
causing damage.