[Olsr-users] Off Topic: Frequency select

[Derek C]

Hi,

Well - I just swapped from channel 6 to channel 1 based on the Wikipedia
Meraki page that says that channel 6 is the most pre-programmed channel in
consumer APs - http://en.wikipedia.org/wiki/Meraki

I saw an immediate improvement with one OLSRd node (<1mbit up to 4mbit)
but I'd say I'll still have problems with interference.

It's a pity we can't change the channel bandwidth with the standard
madwifi drivers - maybe these settings would help too.

The other thing I found that brought the speed up was to change the
distance setting from 12000 meters to 800 meters - I didn't think I'd see
any difference in throughput based on this setting but I did.

Derek


On Sun, January 25, 2009 5:21 am, vijay kumar wrote:
> HOw can we identify the channel selection ?? Is it purely on
> interference and switch to the channels ...??
>
> On Sun, Jan 25, 2009 at 12:33 AM, Henning Rogge <(spam-protected)>
> wrote:
>
>> On Samstag 24 Januar 2009 19:54:16 Derek C wrote:
>>
>>> Hi all,
>>>
>>>
>>> Sorry - this is [yet another] off topic mesh question again:
>>>
>>>
>>> I'm having interference problems - no surprise I suppose because I'm
>>> using 2.4 Ghz.  I see a good association strength (via wlanconfig athX
>>> list sta) and I've found that with lots of iperf tests the through put
>>> is sometimes 7Mbits/sec and sometimes <1Mbit/second.  Also it can be
>>> good for a number of tests and I'll try again later and it'll be poor
>>> again so I reckon its interference.
>>>
>>> I'm using channel 6 (2.437).
>>>
>>>
>>> I don't know if/how to control bandwidth (Mhz channel width) in
>>> madwifi so I think I only have channels 1,6 and 11 available like
>>> normal APs.
>>>
>>> Unless perhaps its good to be in the middle and accept interference
>>> on the main channels (like channels 3 and 9)?
>>>
>>> What have you found to be a good channel selection?
>>>
>> WLAN Channels in the 2.4 Ghz overlap by 80%... so you need a difference
>> of 5 channels to get no overlap at all.
>>
>> Because of this most times the only used channels are 1, 6 and 11... so
>> you have three channel which do not jam each other.
>>
>> Henning
>>
>>
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>>
>
>
>
> --
> Regards,
> Vijay Kumar Goturi.
>
>
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>


-- 
--
Derek C
In Ireland