Need some advice regarding building a low-range point-to-multipoint network in rural area. 1 main building with office + 2 other branch offices in other buildings.
The main office is located at altitude a bit lower then other 2 building ,(approx 50 m) but the distance until them are just 120-150 m.
Cables I will use minimum long -1.5 m.
After search at avaliable equpment for reasonable price I found
Netgear AP/Bridge WG302
Omni-directional antennas ANT2409 (9dbi)
Not sure what to use for other 2 points - DLINK ANT24-1201 12dBi Yagi - Is it OK for that ?
Some people offering a Cisco Aironet 1300,but they are too much expansive.And I supose is an overkill for such a small distance ?
What could you suggest in my situation ?
Thanks in advance.
The WG302 is a good access point, I would recommend it in this application. Provided the line of sight is good (i.e. nothing obstructing the link), for 150m the stock antennas would almost do the trick so you will have no problems at all with the 9dBi omni to 12dBi yagis.
Although they are well built, Netgear and D-Link do charge quite a bit for their antennas. Shop around and see what else you can get hold of, for example Pacific Wireless make very good antennas and are generally a fraction of the price of 'network brand' equivalents.
I used Linksys WRT54G Routers and Linksys WET54G wireless ethernet bridges in a suitation exactly same as yours and used 8dbi Omni and 2 12dbi Yagis and 10m cables all up came in UNDER $1000.00
The WET54G's are not an ideal solution for bridging as they are really just a standard 802.11 client with an Ethernet port. While fine for connecting a single remote computer (the WET54G forwards the MAC address of the connected computer as the wireless client MAC address), when connecting to multiple machines such devices often give poor performance as this type of operation does not fall within the 802.11 specifications. It depends on how well the manufacturer has implimented the bridging support though.
When bridging networks ideally you should use devices designed with the ability to operate as a true multipoint bridge (such as the WG302 above or even the Linksys WAP54G), not a standard infrastructure (AP to client) network.
First,thanks a lot to everybody who replied to my post.
Before to ask at this forum,I posted on Netstumbler forums,but i was treated like a dog
by some eXPerienced showting that what I want to do is bull**t,
and I must hire a professional to do this.
I am just a beginner in wi-fi,but I have rights to learn new things.
At the moment,the director of our small enterpise is making contact with someone who can actually do all installations.
But is garanteed ,with much more higher price for our budget.It could be about 3000 EUR.
Every of professional installers want to get their own extra bunch of money for equipment price/installation service.Even "deployment research on installation site" is money. :-)
So,I was searching for somehow economical solution.
Google told me,that actualy,a lot of people made that themselves.
I will keep in mind a Linksys equpment and others,though I am calculating with what found in the one store.
We planing to install the bridge under the roof,and the antenna on the roof.
I would prefere an external/outdoor antennas because of atmospheric/terrain issues etc.
The cable loss calculations is showing,that I can easily take up to 10 meters.
On the site of radiolabs.com I calculated,that:
--- Free Space Loss on 0.15 km 83,55 dB / to bridge receive sensitivity 96 dB
--- 6 dBi for antenna is enough for 150 meters ,and putting higher gain dBi might be illegal ( in EU 20dB ) ?
--- What I am doubted about,if antennas are with high gain,what is the way to reduce the "drilling power" ?
Here is Freshel Zone - 1st f.zone radius 2m at distance 80m ,and 60% No Obstacle Radius is 2 meters.
On the way of one link,the top of tree is crossing possibly that zone.But not enterely.
We planing to install the bridge under the roof,and the antenna on the roof.
I would prefere an external/outdoor antennas because of atmospheric/terrain issues etc.
The cable loss calculations is showing,that I can easily take up to 10 meters.
On the site of radiolabs.com I calculated,that:
--- Free Space Loss on 0.15 km 83,55 dB / to bridge receive sensitivity 96 dB
--- 6 dBi for antenna is enough for 150 meters ,and putting higher gain dBi might be illegal ( in EU 20dB ) ?
--- What I am doubted about,if antennas are with high gain,what is the way to reduce the "drilling power" ?
Here is Freshel Zone - 1st f.zone radius 2m at distance 80m ,and 60% No Obstacle Radius is 2 meters.
On the way of one link,the top of tree is crossing possibly that zone.But not enterely.
What a shame to hear about the Netgear forums! You are certainly always welcome here however!
With regards to your link, 20dBm EIRP is pretty low as a legal limit. In fact operating the WG302 at all in Europe is technically illegal as according to the specs it puts out 25dBm EIRP from the factory! Yet they still manage to sell them fine so I'd personally still go with it.
10m of cable (make sure it's good quality at that length) will provide you with a bit of attenuation so that will help keep things toned down with regards to EIRP. I wouldn't be too concerned about the 20dBm limit if you are only running slightly above this and if the installation is done well with minimal interference to others.
The Fresnel zone issue in your case will be fine. Trees don't do an awful lot to the signal over such a short distance unless they are very thick and as you still have visible LOS there should be no cause for concern once again.
I think the odds are in your favour with this project and you should find it pretty straightforward to get the link running reliably. I hope it all works out well.
I will stop at choice Linksys WAP54G,but before to proceed I have one more question before to check.
As I understood,the central WAP54G will act as AP,and remote sides as bridges connecting to the OTHERSIDE LAN.
Linksys states ' is not functioning as DHCP server in bridge mode'.
Should I setup a dhcp server before the central WAP54G working as an acces point AP.
And DHCP broadcast passes to the PC's connected on the other bridges sides. Right ?
In this way remote Linksys boxes will be completly invisible to the central server side ?
Correct, just be sure you use bridge mode and not client mode when setting up the remote WAP54Gs or you may end up with connection problems. Bridge mode will make the Linksys boxes completely transparent to all of the computers so it's just like having a switch and really long cables.
A DHCP server anywhere on the network should be able to hand out addresses to any clients, so make sure you only have one DHCP server running to prevent conflicts.
I succesfuly setup this network,connection works excelent.
The parabolic grid antenna at the central point,and on ther sides was enought with buld-in antennas of WAP54G.
The only extra thing was to get a cable from N Type for antenna to RP-TNC of the Linksys.
Hello, it is not just building a solution , but it is all about building a good and solid solution that you can relay on. What i will advice you to do is to use this solution as follow in building a point to multi-point link on 2.4ghz.
1. Senao NOC 3220
2. Omni Directional 12dbi
3. 2watt amplifier (this is base on the distance which you wish to transmit the power of signal to)(Optional).
note: if you only want to transmit to 120m -150m, you can build you solution like this:
Mount a pole with the Ap and the Antenna outside without adding any ampliher. Thanks
Dude, a 2W amp and 12dBi omni is illegal in many countries (32W EIRP! ), not to mention overkill. That type of power would also fill the entire 2.4GHz ISM spectrum with noise, effectively drowning out any third party equipment in the area.
point-to-multipoint advice needed 
You are certainly always welcome here however! 
), not to mention overkill. That type of power would also fill the entire 2.4GHz ISM spectrum with noise, effectively drowning out any third party equipment in the area. 
Linear Mode
