I would like to verify this statement.
Because we are using 1042N, 1600, 1700 cisco router, our partner told me that although 2.4ghz support 802.11n but they are not recommend to open. Is this true?
The 802.11n protocol, which was ratified as an amendment to the 802.11 standards in 2009 allows for usage in either 2.4 or 5 GHz bands and introduces MIMO (multiple input, multiple output) using multiple radios allows for encoding multiple Spatial Stream’s simultaneously (i.e) up to 4 times the data in the same amount of airtime theoretically, 3 spatial Streams is the practical limit. The 2.4 GHz band supports data rates up to 216 Mbps (assuming 20 MHz channel and 3 spatial stream transmitter). 802.11n also specifies a wider channel operation at 40 MHz commonly referred to as a bonded channel as it requires two 20 MHz channels to make a single 40 MHz channel. We do not support bonding of channels in 2.4 GHz because of interference issues associated with only having 3 non-overlapping channels available (Figure 3-3).
The number of devices, which support 3 spatial streams, is limited to higher end laptops and tablets as well as access points. Two spatial stream devices are more plentiful but still limited to Laptops and tablets, with only a few of the newest smartphones now support multiple spatial streams. In all cases, 802.11n products introduced a technology for receivers called MRC (Maximal Ratio Combining) a technique which relied on multiple receivers/antenna’s to mitigate the reliability issues associated with early 802.11b and 802.11g/a receivers and improved the overall reliability and performance of Wi-Fi. Therefore, modern 802.11n based radios improve on reliability when operating under the 802.11g standard.
Figure 3-3
