802.11, 1997 - the original 2Mbit/s, 2.4GHz version
802.11a, 1999 - 54 Mbit/s, 5 GHz standard physical layer
802.11b, 1999 - 11Mbit/s, 2.4GHz physical layer
802.11c - 802.1D standard MAC layer bridge operation procedures
802.11d - International country-to-country roaming extension
802.11e - service quality enhancement.
802.11f - interoperability.
802.11g - 54Mbit/s, 2.4GHz physical layer
802.11h - spectrum and transmit power management extension via 5GHz indoor and outdoor channel
802.11i - authentification and security enhancement.
802.11n - higher throughput improvements using 802.11a's MIMO extension
In addition to the IEEE standards above, a 2.4GHz technology called IEEE802.11b+ uses PBCC (Packet Binary Convolutional Code) to provide data transfer speeds of 22Mbit/s. Unfortunately, IEEE802.11b+ is not an open IEEE standard but a proprietary technology owned by Texas Instruments. Other standards include 802.11g+, offering data transfer speeds of 108Mbit/s on a IEEE802.11g platform. Like 802.11b+, this is a non-open standard technology. Another technology introduced by Atheros, a Wi-Fi network IC manufacturer, is known as SuperG.
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