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1)Simplex Communication

•Data travels in one direction only e.g. printing & pager

2)Half Duplex

•Also known as two-way alternate

•Transmission in one direction only

•This depends on some form of turn around mechanism e.g. walkie-talkie

3)Full Duplex / Duplex

•Transmission in both directions simultaneously

•Requires independent forward and backward paths e.g. mobile phone

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