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

[Randall]

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 
> <mailto: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?

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.


>
> Best,
> Naman
>
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