Provided is a keystone jack for use as a port in a wired computing network. The keystone jack includes a housing, a plug receptacle within the housing configured to receive a plug connector therein, a termination portion of the housing for connecting a network cable thereto, a first circuit disposed between the plug receptacle and the termination portion, a plurality of conductive terminals disposed within the plug receptacle and configured for defining together with the first circuit and the termination portion a communication channel for electrically communicating between the plug receptacle and the termination portion, and an interfacing unit being in electric communication with the first circuit and configured for interfacing with a detachably attachable supplementary electric unit to provide electrical communication thereof with said at least a portion of the communication channel.