This is strange - IF I physically disconnect all the extensions at the back of the faceplate, my router shows 2400kb. If I then plug into the actual master socket I see 3700kb. It is a 'standard' BT master with detachable faceplate. Is it known for a breakdown to exist in these faceplates? I assume it is just a straight wiring connection between the faceplate male plug and the connectors on the back or is there something else there?