[WLANware] hello and basic question about multi hop bandwidth loss

[Naman Muley]

Randall,


On Thu, Apr 26, 2012 at 7:03 PM, Randall <randall at songshu.org> wrote:

>  On 04/26/2012 03:14 PM, Naman Muley wrote:
>
> Hi Randall,
>
>
> On Thu, Apr 26, 2012 at 6:30 PM, Randall <randall at songshu.org> wrote:
>
>> dear all,
>>
>>  Trust me, I am thankful you're writing in English. I'm in India :)
>
>
>> first of all apologies for addressing this list in English since my
>> writing skills in German are not good enough, reading is no problem though
>> so any reply is much appreciated
>>
>
>  I myself am not very experienced. Yet, I'll try to answer your query.
> Please correct me if you feel there's something fishy in my answer.
>
>
>> i'm trying to set up a new network based on the freifunk firmware in
>> rotterdam, the netherlands and at the moment researching the options and
>> possibilities.
>>
>> i have a lot of questions ;) but will start with one.
>>
>> as to my understanding the bandwidth drops to 10% after several hops,
>> does this also apply if you connect them with an ethernet cable?
>>
>>  No. Wireless networks face a lot of losses because of environmental
> factors. Ethernet cables carry signals over electricity. The bandwidth here
> depends on the bandwidth that the cable gives. More importantly, the
> clocking / speed that your service provider sets. (you may not get as much
> as its written in reality)
>
>
>> lets say you have a single street, where 0 is a freifunk node and +0 is a
>> freifunk node with internet access.
>>
>> what i think usually will happen is as follows:
>>
>> +0      0      0      0
>> 100% 70% 40% 10%
>>
>>
>> but..... my thought/question, can you prevent the bandwith loss if you
>> connect the nodes as follows with a cable
>>
>>
>> +0-----0------0-------0
>> 100% 100% 100% 100%
>>
>>
>> this eventually would create a backbone that is not troubled by the
>> wireless overhead that other nodes not connected by cable could connect to
>> as well
>>
>>  0         0        0      0
>> 70%     70%   70% 70%
>>
>> +0-----0------0-------0
>> 100% 100% 100% 100%
>>
>>  0         0        0      0
>> 70%     70%   70% 70%
>>
>>
>> thanks for your time,
>>
>> Randall
>>
>>
>>  your proposal is essentially correct. The ideas that you have are
> correct. Except, the reason we have wireless networks is to avoid cable.
>
> Its true that a backbone network can be formed. Essentially that is what
> happens in real life. The wireless link is generally the last link in the
> connection. Now, what kind of architecture you follow for your mesh network
> is upto you. Afaik you could implement this architecture for your network.
> The question is, can you obtain such hardware? The wired links that you are
> talking about will have to be connected over kilometers.
>
> Hope I've induced a few ideas that will answer your query.
>
>
>
> to clarify a bit, the setup here would be a shopping street with shops on
> both sides of the street, the routers connected by cable would be the
> outside network and be dispersed about 30 or 50 meters?
>
> aah! yes, this should be done easily. The method proposed by Saverio
should do well.


> in the shops itself you could place a wireless router that will connect to
> the outside cable connected backbone.
>
>
was thinking of using simple cheap routers for this, if it would eventually
> would become several kilometers it would still be a lot of simple cat5
> cable of about 50 meters a piece.
>
> Yes, that would be fine.
I was imagining a mesh network spanning several kilometers..
Thanks for the clarification!

-Naman

>
>
>
>  Best,
> Naman
>
>> _______________________________________________
>> WLANware mailing list
>> WLANware at freifunk.net
>> Abonnement abbestellen? -> https://freifunk.net/mailman/listinfo/wlanware
>>
>> Weitere Infos zu den freifunk.net Mailinglisten und zur An- und
>> Abmeldung unter http://freifunk.net/mailinglisten
>>
>
>
>
> _______________________________________________
> WLANware mailing listWLANware at freifunk.net
> Abonnement abbestellen? -> https://freifunk.net/mailman/listinfo/wlanware
>
> Weitere Infos zu den freifunk.net Mailinglisten und zur An- und Abmeldung unter http://freifunk.net/mailinglisten
>
>
>
> _______________________________________________
> WLANware mailing list
> WLANware at freifunk.net
> Abonnement abbestellen? -> https://freifunk.net/mailman/listinfo/wlanware
>
> Weitere Infos zu den freifunk.net Mailinglisten und zur An- und Abmeldung
> unter http://freifunk.net/mailinglisten
>
-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://mailman.freifunk.net/pipermail/wlanware-freifunk.net/attachments/20120426/d2a91799/attachment.html>