802.11a
802.11a
The 802.11a amendment to the original standard was ratified in 1999. The 802.11a standard uses the same core protocol as the original standard, operates in 5 GHz band, and uses a 52-subcarrier orthogonal frequency-division multiplexing (OFDM) with a maximum raw data rate of 54 Mbit/s, which yields realistic net achievable throughput in the mid-20 Mbit/s. The data rate is reduced to 48, 36, 24, 18, 12, 9 then 6 Mbit/s if required. 802.11a has 12 non-overlapping channels, 8 dedicated to indoor and 4 to point to point. It is not interoperable with 802.11b, except if using equipment that implements both standards.
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Alliance to certify Wi-Fi security specs HANOVER, GERMANY -- The Wi-Fi Alliance expects to certify by May its WPA (Wi-Fi Protected Access) set of specifications in the first of several efforts to provide greater security to users of high-speed wireless networks, said Andrea Vocale, a technical expert with the alliance, speaking Monday at a news conference at the CeBIT trade show here.
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[more] THE A to Z of wireless terms and technologies Everything you need to know about Wireless Jargon 802.11a
54Mbps wireless Ethernet operating in the 5GHz band.
802.11b
The industry standard 11Mbps wireless Ethernet operating at 2.4GHz.
802.11e
Defines quality-of-service for wireless local area networks, to support voice-over IP for example.
802.11g
Successor to 802.11b, providing up to 54Mbps over the same 2.4GHz spectrum used by 802.11b.
802.11h
A supplement to 802.11a to ensure t......
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"Previously, at......
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Secur......
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The proposal, put forth by the vendor group called Task Group 'n' s......
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[more] Wireless Noise Hampers DefCon A team of wireless security and performance specialists from AirMagnet today
reported their findings after spending the weekend monitoring wireless network
traffic at DefCon, the self-described "convention for underground hackers." A
representative from the AirMagnet group noted with some surprise that RF
interference from non-Wi-Fi devices seemed to pose the greatest threat to the
conference's wireless networks.
"The wireless attacks we saw--jamming,
de-au......
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