Wi-Fi Alliance updates 802.11n logo and testing2009-10-01 08:42 by PhilipTags: 802.11n, Wi-Fi Alliance, Wi-Fi, IEEE
As many of you know, the IEEE has ratified the final 802.11n standard recently, and now the Wi-Fi Alliance officially updates its tests from "draft 2.0" to "Wi-Fi Certified n." It also introduces a new logo without the "draft" wording, adding a tag line below the seal where you can see "dual stream n" for devices with 2 transmit/receive spatial streams, or "multi-stream n" for anything with 3 or 4 transmit/receive streams. To make it a bit more informative and confusing for the uninitiated, the Alliance will also throw on a "product labeling matrix" that spells out what bands are used (2.4 / 5 GHz) and how many transmit/receive streams each band supports.
The Alliance is also going beyond just the IEEE 802.11n specs, such as the actual testing for simultaneous transmission of up to three streams (only 2 are required for true 11n access point and 1 for client systems like laptop or a phone). Other optional tests include Packet Aggregation (A-MPDU), a method of increasing data throughput; Space-time Block Coding (STBC), which allows receivers to get multiple copies of the same signal to improve reliability; and channel coexistence so that 11n's wider 40MHz channels dummy back to 20MHz in the presence of older networks. See more -here-
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