<P> A duplex communication system is a point - to - point system composed of two or more connected parties or devices that can communicate with one another in both directions . Duplex systems are employed in many communications networks , either to allow for a communication `` two - way street '' between two connected parties or to provide a `` reverse path '' for the monitoring and remote adjustment of equipment in the field . There are two types of duplex communication systems : full - duplex ( FDX ) and half - duplex ( HDX ) . </P>
<P> A duplex communication system is a point - to - point system composed of two or more connected parties or devices that can communicate with one another in both directions . Duplex systems are employed in many communications networks , either to allow for a communication `` two - way street '' between two connected parties or to provide a `` reverse path '' for the monitoring and remote adjustment of equipment in the field . There are two types of duplex communication systems : full - duplex ( FDX ) and half - duplex ( HDX ) . </P>
in which mode the communication channel is used in both directions at the same time
in which mode the communication channel is used in both directions at the same time
A duplex
A duplex