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Modes of transmission
simplex : transmission happen only one direction. the sender cannot receive and the receiver cannot send. fm radio is simplex mode of transmission

half duplex: half duplex transmission is capable of transmitting data in both the direction but in only one direction at a time. modems is good example

full duplex : a full duplex commonly called duplex provides for simultaneous two way transmission. transmission is faster
four wire full duplex modems used in telephone lines.

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