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Ieee 802.11 အဆင့်ဆင့် ဆင်းသက်လာပုံ

edited October 2009 in Networking
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IEEE 802.11: the original 1 and 2 Mbps, in the 2.4 GHz industrial, scientific and medical (ISM) band, and infrared (IR) standard (1999).
– IEEE 802.11b: enhancements to IEEE 802.11 to support 5.5 and 11 Mbps(1999).
– IEEE 802.11a: the IEEE 802.11a standard operates in the 5 GHz band and allows throughputs from 6 to 54 Mbps.
– IEEE 802.11g: allows to reach higher data rates (54 Mbps, identical to IEEE 802.11a) in the 2.4 GHz band. The orthogonal frequency-division multiplexing (OFDM) modulation is used. It provides backwards compatibility with 802.11b (2003).
– IEEE 802.11d: international (country-to-country) roaming extensions (2001), access points (APs) communicate information on available radio channels and acceptable power levels, according to countries’ lawful restrictions.
– IEEE 802.11c: bridge operation procedures, included in the IEEE 802.1D standard (2003). IEEE 802.11e: enhancements (2005), standard for the quality of service (QoS), which defines the specifications of the QoS mechanisms to support multimedia applications. Apply to IEEE 802.11b/a/g. It introduces the hybrid coordination function (HCF). HCF uses both a contention-based channel access method, called the enhanced distributed channel access (EDCA) and a contention-free channel access method, called HCFcontrolled channel access (HCCA) which have been derived from their earlier versions enhanced distributed channel function (EDCF) and HCF.
– IEEE 802.11F: deals with the standardization of protocols between Aps to allow the use of a multivendor infrastructure avoiding proprietary standards. The Inter-Access Point Protocol (IAPP) offers this interworking
feature.
– IEEE 802.11h: spectrum managed IEEE 802.91a (5 GHz) for European compatibility (2004). Mechanisms of frequency dynamic selection and transmit power control (TPC) are considered.
– IEEE 802.11i: enhanced security (2004). Apply to standards IEEE 802.11 b/a/g.
– IEEE 802.1X standard: provides security mechanisms for various media including wireless links by the means of strong authentication procedures with dynamic key distribution.
– IEEE 802.11j: convergence of the American (IEEE 802.11) and Japanese standards (it is the adaptation of the former to the Japanese legislation).
– IEEE 802.11k: radio resource measurement (RRM) enhancements; it defines methods and measuring criteria needed by higher layer protocols to fulfill management and maintenance functions.
– IEEE 802.11n: higher throughput improvements; it offers higher data rates (108–600 Mbps) in the 2.4 and 5 GHz bands.
– IEEE 802.11p: wireless access for the vehicular environment (WAVE) .
– IEEE 802.11r: fast roaming.
– IEEE 802.11s: mesh networking.
– IEEE 802.11T: wireless performance prediction (WPP) – test methods and metrics.
– IEEE 802.11u: interworking with non-802 networks (e.g. cellular).

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