Definition of Duplex in the Network Encyclopedia.
What is Duplex (in communication)?
Duplex is a telecommunications term referring to bidirectional communication. In full-duplex communication, both stations send and receive at the same time, and usually, two communication channels are required. However, you can also achieve full-duplex communication using a multiplexing technique whereby signals traveling in different directions are placed into different time slots.
The disadvantage of this technique is that it cuts the overall possible transmission speed by half.