04-28-2021 10:09 PM - edited ‎07-05-2021 01:14 PM. Dear All. I have question about channel width 80+80 on cisco WLC is different 160. I see channel width 80+80 have both wifi 5,6. but i not understand why use 80+80. thank you. I am still getting my head around 802.11ac but very much see anything above 40MHz channel widths as corner cases rather than the normal deployment methodology.Personally I have yet to deploy 802.11n in anything but 20MHz wide channels apart from in my lab partly due to the work I am doing in very high density stadiums were channel reuse is my A 100-MHz scope may be a good solution for many 8-bit, MCU-based designs with clock rates in the 10- to 20-MHz range, but 100-MHz bandwidth is clearly insufficient for this 100-MHz clock signal. Figure 3. 100MHz clock captured on the Agilent MSO6014A 100MHz bandwidth scope. Interesting. I run a 40 MHz wide "only" 2.4 GHz network (done it with my 68U and my AC3100), and I have several connected Apple devices. Your comment suggests that my 2.4 GHz network should be stepping down to 20 MHz width, but all the wifi snoopers show the network as still being 40 MHz wide. Enter your administrative username and password, then click the LOG-IN button. The Status page loads. 4. If your browser displays the Menu symbol, click it. 5. Navigate to Settings > Wireless. 6. Enable or disable coexistence at 20/40 MHz: • To allow coexistence at 20/40 MHz, check the Enable 20/40 MHz Coexistence box. You misunderstand my correction. Every Wi-Fi network has a Primary or Control channel that uses 20Mhz, and when the network sends out broadcast/management frames to clients it sends them on the slowest mandatory data rate on the control channel at 20Mhz. For simplicity's sake, lets consider an AP on channel 36 @ 40Mhz. Dynamic is just that, it is supposed to switch back and forth between 20 and 40. For 40, it is only 40. These are channel widths NOT the same as the wifi frequency (2.4GHz and 5.0Ghz) A simple example: for 2.4 Ghz you have channels 1-11. if you set to 20 Mhz for channel 2, the wifi signal bleeds from a little below channel 1 to channel 4, so The radio spectrum is the part of the electromagnetic spectrum with frequencies from 3 Hz to 3,000 GHz (3 THz ). Electromagnetic waves in this frequency range, called radio waves, are widely used in modern technology, particularly in telecommunication. To prevent interference between different users, the generation and transmission of radio La maggior parte dei router e dei dispositivi WiFi determinerà automaticamente se usare canali da 20Mhz o da 40Mhz a seconda dei canali disponibili, dei protocolli supportati dal client e dal punto di accesso, e del livello di interferenza. Ma i sistemi più sofisticati possono permetterti di ignorare le impostazioni automatiche. When combining two channels in 802.11, all the noise on the primary channel is present on the secondary one as well, and noise is always additive. If your noise floor is at -95dBm on a 20MHz channel, it can get up to -86 on 160MHz channel. In order to get 5/6 256QAM (802.11ac MCS9), you need roughly 40dB of SNR, which puts your minimum RSSI to VO7SA.