Introduction
Transmission
means transferring of data between two devices. The way in which data is
transmitted from one device to another device is known as transmission modes. It
is also known as communication mode. There are three types of transmission
modes: Simplex, Half Duplex, Full Duplex.
Simplex
In
Simplex mode, the communication is unidirectional, like as one-way street. Only
one of the two devices on a link can transmit, the other can only receive. The
simplex mode can use the entire capacity of the channel to send data in one
direction. Example: FM Radio, TV Broadcasting, Keyboard,
Monitors.
Half Duplex
In
half-duplex mode, each station can both transmit and receive, but not at the
same time. When one device is sending, the other can only receive, and vice
versa. The half-duplex mode is used in cases where there is no need for
communication in both direction at the same time. The entire capacity of the
channel can be utilized for each direction. Example: Walkie-
talkie.
Full Duplex
In
full-duplex mode, both stations can transmit and receive simultaneously. In
full duplex mode, sharing can occur in two ways: Either the link must
contain two physically separate transmission paths, one for sending and other
for receiving. Or the capacity is divided between signals travelling in both
directions. Full-duplex mode is used when communication in both direction is
required all the time. Example: Telephone, Mobile Phones.
Comparison of Transmission Modes
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