[Answer] How many non-overlapping channels are available with IEEE 802.11a standard?

Answer: 12
How many non-overlapping channels are available with IEEE 802.11a standard?

The 802.11 family consists of a series of half-duplex over-the-air modulation techniques that use the same basic protocol. The 802.11 protocol family employs carrier-sense multiple access with collision avoidance whereby equipment listens to a channel for other users (including non 802.11 users) before transmitting each packet. 802.11-1997 was the first wireless networking standard in the family but 802.11b was the first widely a…

IEEE 802.11h-2003 – Wikipedia

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73 rows · WLAN (wireless local area network) channels are frequently accessed using IEEE 802.11 …

To prevent interference there are only three non-overlapping usable channels in the U.S. and other countries with similar regulations (channels 1 6 11 with 25 MHz separation) and four in Europe (channels 1 5 9 13 with only 20 MHz separation).

The data rate is reduced to 48 36 24 18 12 9 then 6 Mbit/s if required. 802.11a originally had Sun Dec 12 2021 13:30:00 GMT-0500 (Eastern Standard Time) non-overlapping channels 12 that can be used indoor and 4/5 of the 12 that can be used in outdoor point to point configurations.

IEEE 802.11n-2009 or 802.11n is a wireless-networking standard that uses multiple antennas to increase data rates. The Wi-Fi Alliance has also retroactively labelled the technology for the standard as Wi-Fi 4. It standardized support for multiple-input multiple-output frame aggregation and security improvements among other features and can be used in the 2.4 GHz or 5 GHz frequency bands.

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