WLAN802.11ac Data Rates. This page of WLAN 802.11ac tutorial covers WLAN 802.11ac data rates . Following table describes 802.11ac data rates for 20MHz,40MHz,80MHz and 160 MHz bandwidths for various modulation-coding schemes. All the data rates mentioned are with short Guard Interval. MCS 9 is not allowed for 20MHz BW. ChannelBandwidth: 20MHz, 40MHz (40MHz optional) 20MHz, 40MHz, 80MHz, 80+80MHz & 160MHz (40MHz support made mandatory) 20MHz/40MHz @ 2.4GHz, 80MHz, 80+80MHz & 160MHz @ 5GHz. Subcarrier Spacing. In40Mhz, a maximum of 18 users are supported with 26 tone RU's. Similarly, in 20Mhz, a maximum 9 users are supported with 26 tone RU's. Fields with user value as 1 is a SU (single user) case, where whole spectrum is allocated to one user. Plot among tones, Bandwidth and number of users. RU allocations can happen with a combination of tones. Configuresthe DCA channel bandwidth for all 802.11 radios in the 5-GHz band. Sets the channel bandwidth to 20 MHz, 40 MHz, 80 MHz, or Best; 20 MHz is the default value for channel bandwidth. 80 MHz is the default value for best. Set the channel bandwidth to best before configuring the constraints. Normallya Wi-Fi radio channel is about 20MHz wide. One trick used by some 802.11 Wi-Fi standards is to increase the width of the radio channel from 20 to 40 MHz, or even further all the way up to 160MHz wide channels. By doing that the radios can fit more data into each channel, since the channel is now much wider and can transmit much more Itmakes use of the same 2.4GHz band, but improves its performance to provide up to 1,148Mbps when we use four antennas in MU-MIMO 4T4R configuration. Regarding the 2.4 GHz WiFi band, we can comment that it operates from 2,412 MHz (channel 1) to 2,472 MHz (channel 13). Therefore, we would have a new channel every 5 MHz apart. TheGUI says it is set to 40 Mhz but the overview shows 20 Mhz for every device. For your desired config to work, ALL SSIDs on the 2.4 GHz chip must be set to 40MHz wide, your wording implies you might have multiple SSIDs. The WiFi pre-shared key is changed under the Wireless page, by editing the SSID in question, it's located on the same page as the channel width setting under "Wireless Security" Forexample, 802.11n supported four spatial streams (4x4 MIMO) and a channel width of 40MHz. But 802.11ac can utilize eight spatial streams and has channels up to 80MHz wide -- which can then be iJadi.