Interframe spacing and priority

Atomic operations commence like regular transmissions: they have to wait for the DIFS prior to commencing. Later on, the second and the remaining steps in an atomic operation occur using the SIFS, rather than during the DIFS. This essentially means that second and the remaining steps of an atomic operation seize the medium prior to another frame type being transmitted. By utilizing the SIFS and the network allocation vector (NAV), stations can grab the medium for as long as they want. The network allocation vector is basically a timer that specifies the amount of time for which the medium is reserved.

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