Short Interframe Space

Short Interframe Space (SIFS), is the small gap between the data frame and its acknowledgment. SIFS are found in IEEE 802.11 networks. They are used for the highest priority transmissions enabling stations with this type of information to access the radio link first. Examples of information which will be transmitted after the SIFS has expired include RTS (Request To Send) and CTS (Clear To Send) messages in addition to positive acknowledgments.

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