IEEE 802.11n, also known as 802.11n, is a wireless network standard using multiple antenna for increased data transfer rates. This standard was introduced to increase the network bandwidth compared to the existing standards (802.11a and 802.11g). The maximum bit rate has also been increased from 54 Mb/s to 600 Mb/s (megabits per second). 802.11n can operate at two frequency bands: 2.4 GHz or 5 GHz.
Only "a" and "ac" operate in 5Ghz, and we know that "a" is limited to 54 Mbs. This one is actually a fair question for once.
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Dedony
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