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Contention Free PollableContention-free pollable (CF-Pollable) is wireless networking defined by the IEEE 802.11b standard uses CSMA /CA or carrier sense multiple access with collision avoidance. CSMA is a contention-based protocol making certain that all stations first sense the medium before transmitting. CA or Collision Avoidance. Each device on a wireless network send out a signal, a request to send, then waits for a Clear to Send reply from other devices on the network before broadcasting information CF-Polling
One way of implementing CSMA /CA is for the access point to poll each device on the network incrementally, providing a Clear to send window. This is useful when transmitting audio or video streams because of the strict synchronization that is provided. See also Reference Jim Geier. "802.11 Medium Access Methods". 802.11 Planet. November 26,2002. June 11, 2003. http://www.80211-planet.com/tutorials/article.php/1548381
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