802.11a Higher Speeds, Smaller Coverage Area, and More Channels

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For the most part, 802.11a equipment is sold to enterprises that want greater capacity
because it supports more simultaneous users per access point (antenna plus transceiver).
This is the result of 802.11a having 24 channels rather than only three. Another
advantage beyond capacity is that the 5GHz frequency is less crowded with devices
that also operate on 2.4GHz, such as microwave ovens and mobile devices equipped
with Bluetooth. These devices can cause interference with Wi-Fi equipment on the
same 2.4GHz band. Enterprises that use 802.11a need to equip employee laptops with
802.11a network interface cards or chips to take advantage of the extra capacity. The
802.11a standard is available in access points sold to residential consumers, but often
at higher prices than those with only 802.11b and 802.11g.
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