SFP working mode classification

Full duplex mode refers to the transmission and reception of data by two different transmission lines, where both communication parties can perform transmission and reception operations at the same time. This transmission method is called full duplex, as shown in Figure 1. In full duplex mode, each end of the communication system is equipped with a transmitter and receiver, thus controlling data transmission in both directions simultaneously. The full duplex mode does not require directional switching, therefore there is no time delay caused by switching operations.

Half duplex mode refers to the use of the same transmission line for both reception and transmission. Although data can be transmitted in two directions, both communication parties cannot send and receive data at the same time. This transmission method is called half duplex. When using half duplex mode, the transmitter and receiver at each end of the communication system are connected to the communication line through a receive/send switch for direction switching, resulting in time delay.