Our interactive big screen products are exported overseas, the big screen is also a network related equipment, it will send out AP hotspot network, so the export overseas to comply with local regulations.
The big screen needs to open a local hotspot with its own NIC for screen casting, inter-device collaboration and other operations. The hotspot is limited by the channel, each country has a radar channel and other military and other restricted channels, avoid these radar channels when using the channel.
In addition, the channel list is divided into indoor devices and outdoor devices AP, cloud screen devices belong to indoor devices. The channel range of the frequency band, take China as an example:
- 2.4G band No indoor or outdoor, AP channel is 1-13
- 5G bands China's indoor channels are 36, 40, 44, 48, 52, 56, 60, 64, 149, 153, 157, 161, 165, but only 149, 153, 157, 161, 165 for outdoor channels.
Specific band channel concepts can be found inNIC-Band, Channel, Bandwidth - TangSongYuanMingQing2188 - Blogsite
Different countries and regions specify the channels that can be used in their country or region, and the maximum transmit power of RF signals in a channel. The signal strength of RF signals operating in different channels may vary.
And how do different regions of the country handle country codes?
Android has a parameter setting for country code =CN.WIFI Country Codes and Channel Segmentation - Meat Rolling and Code - BloglandLinux also has a command line to query/set the current country code.linux set wifi country code using command line - CSDN Blogs
Windows is not open source, so you'll have to go through the network card vendors to accomplish this step. My current understanding is that Realtek and Inel NICs
Realtek network card
Realtek NICs such as 8821, 8811, etc. Realtek NICs provide SingleSkuSolutionCheckTool tool to query/modify country code information, download link:Realtek_SingleSKUValidationTool.zip
Query country code related information, show SingleSkuInfo. Below is the country code information for Japan:
List of channels supported in Japan:
======= Final Legal Channel list =======
2.4G [1(A) 2(A) 3(A) 4(A) 5(A) 6(A) 7(A) 8(A) 9(A) 10(A) 11(A) 12() 13() ]
5G [36() 40() 44() 48() 52() 56() 60() 64() 100() 104() 108() 112() 116() 120()
[124() 128() 132() 136() 140() 144() 149() 153() 157() 161() 165() ]
Set the country code to China: set SingleSku countrycode CN
Check again after setting, the country code information has been modified. China indoor AP channel list, 36, 40, 44, 48, 52, 56, 60, 64, 149, 153, 157, 161, 165
We can record the relationship between regions and country codes for each country to make a mapping table.
When the user switches countries/regions, the above country code settings are automatically executed to fulfill the requirements of the corresponding national channel
Intel's AX Series NICs
AX series NICs don't need to switch the country code like Realteck's code above, the Intel NIC driver has already automatically adapted it internally.
Need to check/force the current country code, you can use the ANT tool provided by Intel, download link:Intel_ANT_Tool.zip。
This ANT tool is the old version, only applies to AX series.Intel new Wifi7 BE series, you need to get the latest version of ANT tool through the supplier or send IPS to Intel, there have been students mentioned the same problem:Re: Ant tools for Intel(R) Wi-Fi 7 BE200 320MHz network adapter (or BE201-BE202) - Intel Community
Query-QueryMCC:
Set country code: ANT -SetMcc US.Setting operation failed
So when switching countries/regions the country code will automatically complete the switch. But at the same time, theThe card will automatically switch to the region according to the connected Wifi environment.It is also not possible to force a change to another region or for the system to set the current regional country.