Can 20M Wi-Fi be used as 100M broadband? Let me share some knowledge

Sometimes I hear friends ask such questions: My router's wireless speed is only 20M/40M, but my home broadband is 100M, will this work?

In the setting interface of some routers, we can indeed see options such as 20MHz, 20/40MHz, and 40MHz.

But please pay attention to the units of these three numbers. They are "MHz", while the unit of "100M broadband" we often say is "Mbps". These are two completely different concepts.

Whether it is 20MHz or 40MHz, it refers to the effective bandwidth of the channel. The 2.4G frequency band is divided into 14 available channels, and China supports channels 1-13.

The effective bandwidth of each channel is 20MHz, and the wireless transmission rate it can provide is generally up to 150Mb/s; 40MHz binds two adjacent channels together and uses them together, and the wireless transmission rate reaches the 300Mb/s we are familiar with.

After seeing this, would you still say that the router cannot meet your 100M broadband needs?

One more thing to add, from the above figure we can see that the three groups of channels 1/6/11, 2/7/12, and 3/8/13 do not cross each other, that is, the three channels in each group do not interfere with each other.

Generally speaking, the 40MHz rate with two channels bundled is better. However, when there are many other wireless signals nearby, the two channels increase the probability of interference, and it is not as good as choosing 20MHz. So, as for which one to choose, it still depends on the usage environment.