| Half Duplex Transmission | Full Duplex Transmission |
|---|---|
| Data can be sent in both the directions but not simultaneously. | Data can be sent in both the directions simultaneously. |
| In Half duplex, devices can transmit and receive but not at the same time. When one device is sending, the other is receiving and vice-versa. | In Full duplex, devices can transmit and receive at the same time i.e. each station/device can send as well as receive data simultaneously. |
| It uses one pair of wire. | It uses two pairs of wires. |
| Chances of collisions are more. | Chances of collisions are less. |
| Slower data transfer as compared to Full duplex. | Faster data transfer. |
| Less efficient as compared to Full duplex. | More efficient. |
| Cost of transmission is low as compared to Full duplex. | High data transmission cost. |
| Example of Half duplex system is walkie-talkie where one person speaks and other listens & vice-versa. | Example of Full duplex is the telephone system where both the persons can speak and listen simultaneously. |
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