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Implementing Cisco Networking Solutions by Harpreet Singh

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IEEE 802.11n

In the year 2009, IEEE standardized IEEE 802.11n that introduced the MIMO technology. MIMO allowed a single device to have multiple wireless antennas, and the antennas could send streams that were received by the antenna at the receiving node. The maximum number of spatial streams allowed is 4. This increased the speed that could be delivered using the 802.11n, being the aggregate of multiple streams. This specification also allowed the use of channel bonding. A typical wireless channel is 20 MHz wide, thus limiting the bandwidth that can be transmitted using this limited wireless spectrum. 802.11n could use two 20 MHz channels, thus increasing the effective channel to 40 MHz and hence increasing the data rate. Note that the ...

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