The invention relates to a telecommunication plug matching with a telecommunications socket. The telecommunication plug comprises a housing, a substrate positioned in the housing, a plurality of plug contacts installed on the substrate, the plug contacts are in contact connection with telecommunications sockets; a plurality of wiring contacts installed on the substrate and electrically connected wires, the wiring contacts comprising at least two wiring contacts on the first surface of the substrate and at least two wiring contacts on the second surface of the substrate opposite to the first surface. The substrate comprises circuit traces bringing the plug contacts into electric connection with the wiring contacts.