IEEE 802.11 MAC Sub Layer || PCF ||Frame Format || GiriRaj Talks

#IEEE802.11#MACLayer#macsublayer
IEEE 802.11 MAC Sub Layer || PCF ||Frame Format || GiriRaj Talks
IEEE 802.11 refers to the set of standards that define communication for wireless LANs (wireless local area networks, or WLANs). The technology behind 802.11 is branded to consumers as Wi-Fi. As the name implies, IEEE 802.11 is overseen by the IEEE, specifically the IEEE LAN/MAN Standards Committee (IEEE 802).
WiFi devices are based on IEEE 802.11. Not every device that uses IEEE 802.11 is Wi-Fi cerified. In Short,Wi-Fi is more of a technology name and 802.11 is the IEEE standard. Note that Wi-Fi is actually a trademarked term of the Wi-Fi Alliance.
802.11a is an IEEE standard for transmitting data over a wireless network. It uses a 5 GHz frequency band and supports data transfer rates of 54 Mbps, or 6.75 megabytes per second. NOTE: In order for an 802.11a connection to work, each device on the wireless network must support the 802.11a standard.
802.11n (Wi-Fi 4)
The first standard to specify MIMO, 802.11n was approved in October 2009 and allows for usage in two frequencies - 2.4GHz and 5GHz, with speeds up to 600Mbps. When you hear wireless LAN vendors use the term “dual-band”, it refers to being able to deliver data across these two frequencies.
The MAC sublayer acts as an interface between the logical link control (LLC) Ethernet sublayer and Layer 1 (the physical layer). The MAC sublayer emulates a full-duplex logical communication channel in a multipoint network. This channel may provide unicast, multicast, or broadcast communication service.
Point coordination function (PCF) is an optional technique used to prevent collisions in IEEE 802.11-based WLAN standard including Wi-Fi. It is a medium access control (MAC) sublayer technique used in areas where carrier-sense multiple access with collision avoidance (CSMA/CA) is used.
IEEE 802.11 MAC Layer Protocol. IEEE 802.11 defines two MAC sublayers: the distributed coordination function (DCF) and the point coordination function (PCF).

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