What Does Full Duplex (FDx) Mean?

Full duplex (FDx) is a bidirectional type of communication system where two end nodes send and receive data signals at the same time, and a single carrier is simultaneously used for dual communication.

Techopedia Explains Full Duplex (FDx)

To send or receive data, the participating nodes in a FDx system do not have to wait for a free carrier/medium. This type of system typically employs a medium that has at least two internal channels - one for sending and one for receiving.