Asus router - meaning of 'control channel' and 'extension channel'

[chrisisbd]

I have an RT-BE92U router and, being quite isolated, 2.4Mhz works pretty well here, especially as our house is quite large.

I'm confused by what Asus means by 'Control Channel' and 'Extension Channel'. All other routers I have ever used just have a plain Channel number. As I am using a TP-Link router also I would like to know what the Asus wording means.

Is Asus' 'Control Channel' the same as what is meant by other (TP-Link in particular) router's 'Channel'? I need to set the routers to use channels 3 and 11 if I can but I'm not clear what I should set on the Asus to achieve this.

 

[Tech9]

I need to set the routers to use channels 3 and 11 if I can

What routers?

This is not possible on a single radio. On 2.4GHz band the extension channel is ±4 channels apart. If you set control channel 3 the only option for 40MHz bandwidth is upper extension channel 7. You may see this configuration represented as 3U. The reverse control channel 7 with extension 3 will be 7L. Google will help you with control and extension channel in Wi-Fi. For 5GHz band look for channel 42 with control channel 36 as an example, very common configuration.