[Asterisk-Users] Voice Over WiFi

[Juergen K. Zick]

Hi there,

Well, looks like you are going to start a new telephony company ,-) ...When 
it is a quite dense populated area then there
should already be enough cables and operting providers ...
If you can find support by cable owners then you could indeed start to 
setup some WiFi cells using their net for building up an own VPN. But these 
cells will probably have just 100m radius w/o directional antennas on the 
client side.
Therefore, roughly per "hotspot" you get an operation area of about 0,032 
km^2  and you have about 1260 km °2 to cover (a 20km radius). Guess how 
many hotspots you need and how many would overlap and create interference 
??? And what happens, when somebody in this area has an own hotspot? How 
should all the hotspots be managed and the traffic routed ???

Sorry, with 801.11a/b/g this is definitely not feasable at all. Probably 
with bigger cells your idea could be realized using a UMTS network ... In 
any case, you must have a BIG investment before that can be done (and much 
money for radio licenses ...)

However, small 801.11a/b/g "islands" work out for customer access in 
general with customer side directional antennas. But not with desktop or 
mobile WiFi phones ...

-- Jürgen



>this is not really an * question but it is somehow related, i am trying to 
>develop a working proposal for cheap and quick telephony services using 
>Voip running over *.  By running a wireless network (over 802.11 a/b/g 
>devices), i plan to be able to reach customers directly with eithe table 
>top or handheld 802.11 sip enabled phones.
>But the disadvantage is that how do i power each radio and back haul the 
>connection (this is to be able to cover at least 20KM radius of densley 
>populated region). During my research, i have fould out that PoE switches 
>exists and can be used to supply both data access and power to the wifi 
>radios, but these only run for 120meters tops b4 signall loss sets in
>Is there a sort of high grade cat5 cable that can propagate signals for up 
>to 1Km? or does anyone have any idea that i could effectively cover 20Km 
>radius wing WiFi?
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