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20Mhz or 40Mhz

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Grafter
Posts: 176
Registered: ‎18-02-2009

20Mhz or 40Mhz

My router has 2 settings 20Mhz or 20/40Mhz. The default setting is 20Mhz.
I bought a new D-link 2740R which had 20Mhz or 40Mhz and the default on that one was 40Mhz.
What's the difference (and don't say 20Mhz!!) and which mode should I choose.
4 REPLIES
Grafter
Posts: 9,786
Registered: ‎16-06-2010

Re: 20Mhz or 40Mhz

Hi julesandsand,
As far as I know these frequencies relate just to the wireless connection. 40 Mhz will give you a wider bandwidth which can be prone to more interference and 20 will obviously be less bandwidth but less prone to interference. This is the black and white answer and there are probably a lot more reasons whether you would use one or the other, depending on whether you were running various machines on your network. All that said, probably the best way to find out is to try each one and see what the performance is like.
Jojo Smiley
Grafter
Posts: 176
Registered: ‎18-02-2009

Re: 20Mhz or 40Mhz

Hi Jojo,
Thanks for that. I've got loads of things attached to my network. I don't think I'll mess about with it - had a bad week with routers!
Grafter
Posts: 9,786
Registered: ‎16-06-2010

Re: 20Mhz or 40Mhz

Don't blame you really but I've just googled '20mhz or 40mhz' and there's quite a bit of info out there if you get the time or the patience.
Jojo Smiley
Grafter
Posts: 176
Registered: ‎18-02-2009

Re: 20Mhz or 40Mhz

There certainly is, I found this useful,

http://www.dd-wrt.com/wiki/index.php/Wireless-N_Configuration