transmission direction has three basic directions :simplex
half duplex
full duplex
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Full-Duplex
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A land- line telephone uses transmission in FULL DUPLEX mode in
which simultaneous transmission and receiving of information takes
place in both direction.
There are three modes of transmission:
1.simplex transmission
2.half duplex
3.full duplex
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Full-duplex or duplex
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A half duplex transmission mode is a process where data can be
sent in both directions, yet the data have to be sent at different
times. The half duplex transmission mode is used in hard disks, DVD
storage and intercom communications.