Editing Channel access method (section)

===Duplexing methods===
Where these methods are used for dividing forward and reverse communication channels, they are known as [[duplexing]] methods. A duplexing communication system can be either [[half-duplex]] or [[full duplex]]. In a half-duplex system, communication only works in one direction at a time. A walkie-talkie is an example of a half-duplex system because both users can communicate with one another, but not at the same time, someone has to finish transmitting before the next person can begin. In a full-duplex system, both users can communicate at the same time. A telephone is the most common example of a full-duplex system because both users can speak and be heard at the same time on each end. Some types of full-duplexing methods are:

* [[Time-division duplex]] (TDD)
* [[Frequency-division duplex]] (FDD)
* [[Echo cancellation]]