What do duplex and half-duplex mean?

I. Full Duplex communication allows data to be transmitted in both directions at the same time, and it is equivalent in capability to the combination of two simplex communication methods. Full Duplex means that signals can be transmitted in both directions (A→B and B→A) simultaneously (instantaneously). It means that A→B while B→A, is instantaneously synchronized.

Two, Half Duplex (Half Duplex) data transmission means that data can be transmitted in both directions of a signal carrier, but not at the same time.

For example, using technology with half-duplex transmission on a LAN, a workstation can send data on the wire and then immediately receive data on the wire from the direction in which the data was just transmitted. Like full-duplex transmission, half-duplex consists of a bi-directional line (the line can carry data in both directions).

Expanded Information

In a full-duplex twisted-pair network, the receiving and transmitting pairs are working at the same time, and each pair has a bandwidth of 100 Mbps, so that in a twisted-pair network, the actual bandwidth being transmitted is 200 Mbps. traffic in both directions, and the same is true for network bandwidth calculations.

In a half-duplex twisted-pair network, at a certain point in time, if the sending pair is in the sending state, the receiving pair can only be in the idle state, even if the physical line allows reception, but not because it is not a full-duplex state depends on the network equipment connected to the twisted-pair cable whether to support full-duplex, and the twisted-pair cable is only to provide a physical medium only.