As we know, IEEE 802.11 a/b/g/n is the set of 802.11 a, 802.11 b, 802.11 g, 802.11 n, etc. these different wireless protocols are all evolved from 802.11 to implement wireless local area network (WLAN) Wi-Fi computer communication in various frequencies, here is the difference between these profiles:

IEEE 802.11 a:

High speed WLAN profile, the frequency is 5GHz, the maximum speed up to 54Mbps (The actual use rate is about of 22-26Mbps), but not compatible with 802.11 b, the distance covered (approx.): 35m (Indoor), 120m (outdoor). Related WiFi products：QCA9377 High-End Bluetooth & Wi-Fi Combo RF Module

IEEE 802.11 b:

The popular WLAN profile, 2.4GHz frequency.

The speed up to 11Mbps, 802.11b has good compatibility.

Distance covered (approx.): 38m (indoor), 140m (outdoor)

The lower speed of 802.11b makes the cost of using wireless data networks acceptable to the public.

IEEE 802.11 g:

802.11g is an extension of 802.11b in the same frequency band. Supports a maximum rate of 54Mbps.

Compatible with 802.11b.

RF carrier:2.4GHz

Distance (approx.): 38m (Indoor), 140m (outdoor)

IEEE 802.11 n:

IEEE 802.11n, the improvement of higher transmission rate, the basic rate is increased to 72.2Mbit/s, the double bandwidth 40MHz can be used, and the rate is increased to 150Mbit/s. Support Multiple-Input Multi-Output (MIMO)

Distance (approx.): 70m (indoor), 250m (outdoor)

Maximum configuration goes up to 4T4R.

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