Wifi 802.11n 40 Mhz

Question

Level 1

1 points

Wifi 802.11n 40 Mhz

Does iPhone 5 supports Wifi 802.11n 40 Mhz channels? every time I set my home router to the 40 Mhz channels my iPhone stops receiving data!

what could be the problem?

Posted on Oct 7, 2013 12:30 PM

Reply

Answer 1

norm123

Community Specialist

Oct 9, 2013 6:59 AM in response to KOURBEH

Hey KOURBEH,

The iPhone 5 supports 802.11a/b/g/n Wi-Fi (802.11n 2.4GHz and 5GHz). If you are having issues with getting data through Wi-Fi, then check out the article below for troubleshooting issues with Wi-Fi.

iOS: Troubleshooting Wi-Fi networks and connections

http://support.apple.com/kb/TS1398

Thanks for using Apple Support Communities.

Regards,

-Norm G.

Reply

Answer 2

KOURBEH Author

Level 1

1 points

Oct 9, 2013 7:51 AM in response to norm123

Hey..

Thanks for answering...

I know iPhone supports 802.11a/b/g/n (2.4GHz and 5GHz) this is not my question

My question is: does iPhone 5, 5c, 5S supports 40 Mhz channels?

in the normal 802.11n configuration the frames are 20 Mhz as standards! when you configuer it as 40 Mhz the iPhone stops reciving data anymore! samething for iPad 2 !!!

is it a problem with the OS?

Reply

Answer 3

KOURBEH Author

Level 1

1 points

Oct 9, 2013 7:57 AM in response to KOURBEH

I think I found my answer here:

http://support.apple.com/kb/HT4199

Apple is still beyond this tech!

Routers that support 802.11n should be configured for 802.11a/n mode for maximum speed and compatibility. Routers that only support 802.11a can be left in 802.11a mode. Different Wi-Fi routers support different radio modes, so the exact setting will vary depending on the Wi-Fi router in use. In general, enable support for all modes. Devices will then automatically select the fastest commonly supported mode to communicate. Note that choosing a subset of the available modes will prevent older devices from connecting (for example, 802.11a devices will be unable to connect to a Wi-Fi router in 802.11n-only mode). In addition, choosing a subset of the available modes may cause interference with nearby legacy networks, and may cause nearby legacy devices to interfere with your network.

Reply

Answer 4

Oct 9, 2013 8:07 AM in response to KOURBEH

Don't know if you have seen this - but it explains some of the pitfalls or unexpected results of enabling 40Mhz channel-width

http://www.smallnetbuilder.com/wireless/wireless-features/31743-bye-bye-40-mhz-m ode-in-24-ghz-part-1

Reply

Answer 5

KOURBEH Author

Level 1

1 points

Oct 9, 2013 10:37 AM in response to Michael Black

I agree, the 2.4GHz band is very crowded and using 40 Mhz in that band is not a clever idea cause of the interference which will impact the performance,

but luckily us we have another band, 5 Ghz is not yet crowded and we can use it in good way, I have setup two SSID in my place, 2.4GHz with 20 MHz channels, and 5GHz with 40 MHz channels to get better performance

in the near future we will have the 802.11ac which will use 40, 80 and 160 MHz with quite good techniques to reduce interference by new coding schemes!

Reply