Used in multiple access topologies such as wireless LAN networks. When a node wants to transmit, it sends a signal called Request-To-Send (RTS) with the length of the data frame to send. If the receiving station wishes to allow the transmission, it replies the sender a signal called Clear-To-Send (CTS) with the length of the frame that is about to receive. If another node hears the RTS will not transmit in order to avoid conflict with the CTS.
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