Hi
There is a school in a remote location and I was wondering if that location could be connected via wimax or wireless mesh networking at a reasonable cost. The service provider there is asking too much money upfront for speeds as low as 2Mbps. Is there a possibility of a layman/do it yourself type to set up a wimax network for them so as to access the internet easily? Which are the unregulated frequencies for wimax/wimesh and which equipments would be needed? Can anybody help?
At the Pabal school (vigyanashram.com) some company from bangalore had setup a communication link but unfortunately it was not sustainable maybe due to financial or logistic problems or it happenned when the technology was raw.
Kussh.
On Saturday 05 March 2011 15:14:16 Kussh Singh wrote:
Yes
You have to create a long distance link with a directional antenna a tincan /pringle antenna is easy to do and has 100s of installations. on one end you connect your wifi router to a regular adsl or other internet connection. At the remote end you terminate into a lan network.
The link will work only line of site, so you need both antenna as high as possible.
You have to create a long distance link with a directional antenna a
be inversely proportional to the square of the transmitter's power.
The link will work only line of site, so you need both antenna as high
as possible.
How high should the antenna be? The Reliance provider says he has 80m high
towers with a range of 15km but we are just 4 km away from that transmitting tower as the crow flies according to him. And then he says we need a tower at our site also which will be provided by him and will be either 18m or 27m high. I fail to understand --on one hand he says his transmitting tower has a range of 15km radius and on the other he needs another tower at the client end of about 27m in height which is just 4 km away. The frequencies (RF or microwave) used or licensed to Reliance are not mentioned--if anybody knows of any link to TRAI or DOT websites which could shed some light on the matter, it would be most helpful. Since the frequencies will determine whether we would necessarily need line of sight or could work even with non line of sight. The frequencies licensed to Reliance would also determine whether we can easily recieve the 2 Mbps speed or there will be significant attenuation.
Also there must be some frequency bands which are still unlicensed or free to the Indian public for putting up their own wireless meshes or wimax etc installations???
Also i have been told that the router being given by reliance in their quotation is almost obsolete and will need to be upgraded to an ethernet router when we go in for speeds higher than 2 Mbps later. So can anybody give me an idea of the hardware equipment to be thought about and the costs involved?
Thanks in Advance for any help.
Kussh
On Saturday 05 March 2011 20:13:34 Kussh Singh wrote:
It depends on EIRP. Which means an omni antenna which radiates 360 steradians works only for short distances.
Links upto 20 Km are operational in installations with both antenna on hilltops. 8 to 10 km LOS would be a safe bet.
You have to be LOS. If there is some obstruction in between (like trees, or buildings) you have to go above that.
Also ISPs use omni directional, not directional, so their equipment is far more expensive
5.4 Ghz afair
ALL wifi requires LOS the operate above 2.4 GHz. The speed is actually capped. But you will get around 4Mbps for long distances with an 802.11G
open meshes are banned. Public use is the wifi band. Although in principle you are not allowed to transmit more than 100Mtrs, I doubt there should be any problem with a school, apart from the departments not having any equipment to check anything worthwhile even in cities.
On Saturday 05 March 2011 03:14 PM, Kussh Singh wrote:
Do you want an internet service provider or simply expand the range of an existing available internet connection?
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jtd -
Kussh Singh -
Rony