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:
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).
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.
802.11g is an extension of 802.11b in the same frequency band. Supports a maximum rate of 54Mbps.
Compatible with 802.11b.
Distance (approx.): 38m (Indoor), 140m (outdoor)
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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