A circuit which uses two electrically separated paths to carry data signals. One path is used for each direction.
A circuit that contains two channels, one designated as a transmission channel, and the other as a receive channel. Named a four-wire circuit because four physical wires are generally used in pairs to complete the circuit.
A circuit that has two pairs of conductors (four wires), one pair for the send channel and one pair for the receive channel; allows two parties to talk and be heard simultaneously.
A system in which the transmitting and receiving paths are separate channels.
A circuit that uses two pair of conductors (four wires), one pair to transmit the signals and one pair to receive; allows two parties to communicate simultaneously.
Telephone lines using two wires for transmitting and two wires for receiving offering much higher quality than a 2-wire circuit. All long distance circuits are 4-wire. Almost all local phone lines and analog phones are 2-wire.
A communications path consisting of two pairs of conductors (wires), one pair for transmitting and one pair for receiving.
A circuit that contains two pairs of wire (or their logical equivalent) for simultaneous (i.e., full-duplex) two-way transmission. Two pairs of conductors, one for the inbound channel and one for the outbound channel, are connected to the station equipment.
In telecommunication, a four-wire circuit is a two-way circuit using two paths so arranged that the respective signals are transmitted in one direction only by one path and in the other direction by the other path.
