Guide to Wireless LAN Analysis 16
Radio frequency (RF) spectrum use is regulated by the Federal Communications
Commission (FCC) in the United States, and by other agencies in other jurisdictions. This
document reflects usage in the United States, but notes those areas in which usage in other
jurisdictions may vary.
The Wi-Fi Alliance is the most significant industry trade group for 802.11 equipment
manufacturers in North America. The group provides certification of equipment
manufactured by its members, indicating the equipment meets various named sets of
specifications published by the group. These specifications are based very closely on the
IEEE standards, but are not absolutely identical with them in all respects. In particular,
options permitted by the IEEE standard but absent from the Wi-Fi Alliance certification
programs may be implemented rarely, if at all. When they are implemented, features from
different vendors not covered by Wi-Fi Alliance certification may not be interoperable.
Individual manufacturers, seeking to differentiate their products, may add sets of
features neither covered nor prohibited by the published standards or certification
programs.
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