20Mhz. -----. 20MHz is the most common Wi-Fi bandwidth as most users still opt to use 2.4GHz radios. 40Mhz. -----. In an environment with less congestion where a higher data throughput is required, using the 40MHz channel can be a good idea as it still offers 12 non-overlapping channels on 5GHz. 80Mhz. -----. When you're making a decision between 20 MHz vs 40 MHz vs 80 MHz vs 160 MHz what you're doing is picking a channel width. We got an introduction to Wi-Fi channels above. We saw that the 2.4 GHz Wi-Fi band is chopped up into smaller 20 MHz bands for use. These smaller bands are the channels that Wi-Fi devices communicate on. With 20MHz-wide channels on 802.11n, you can only get the 72.2, 144.4, or 216.6Mbps top PHY rates (for 1-, 2-, and 3 spatial streams, respectively). Going to 40MHz-wide channels makes it 150, 300, and 450 Mbps, respectively. Blog Cisco When and How to Use 20mhz vs 40mhz vs 80mhz When and How to Use 20mhz vs 40mhz vs 80mhz The word network is a simple word of seven letters, but is it that simple? Let's take a broader look to understand it rightly. If putting it simply, whenever we think of or talk about some inter-connected stuff or location, we refer it as a network. Back than there wasnt much 2.4Ghz traffic so the higher bandwidth helped. In a densed wifi environment 20 mhz helps more than 40mhz. It is possible to apply 40mhz on channels 1 or 13 which will give less of a chance of interference. back than wifi practical rates were a lot lower than now. b9BPOPc.

difference between 20mhz and 40mhz bandwidth