No more hiding in the server room
Wireless Bridging part 2
A few months back I had to build a bridge that connected a camera at a front gate to a firewall in a service building 500ft away. It worked fine, but the short distance and Line of sight made it easy as pie.
Now, I have to bridge an office and a barn, the distance between the two locations is approximately 3000m, or 1.85 miles. Does anyone have any experience with this and can throw me some pointers. I have never bridged a distance this far, the 500ft bridge was my biggest so far.
There is already a VPN in place between the two locations, but the issue we keep facing is that the barn is out in the middle of nowhere and can barely get dialup speeds, the office has a 20mbps business cable connection that it barely uses. It would be nice to share some of that with the barn and make accessing the IP cameras out there a little more speedy.
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Replies to This Discussion
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Permalink Reply by Danny Nolan on -
On a side note, there may be line of sight, I will be checking into that later today. It would be a very narrow line of sight with buildings within 2degrees in either direction, if it exists.
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Permalink Reply by Wesley "Nonapeptide" on
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Are you using patch / panel antennas? At that distance, I'd say to look into a parabolic grid antenna. I'm not 100% sure about the power transmission laws though. I think the FCC (assuming you're in America) caps antennas like that at 1 watt without special permits... ? Don't quote me.
Are you familiar with calculating the Fresnal zone of a beam? You need the Fresnal zone to be 60% clear to get anything reliable. Preferably 80%. When lining the two beams up, make sure to use some kind of amplitude measuring tool (oscilloscope) to measure the power of the received beam. You can have a strongish signal and think you're lined with the main beam, but really be aligned to a side lobe.
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Permalink Reply by Danny Nolan on
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My company owner used to work in Telecoms, including cell towers. He contacted a few friends who happened to move into point to point bridges and point to multipoint small scale networking. It looks to be a viable solution for us.
It would provide us with 5mpbs down
2mbps up
Not amazing, but 10 times better than we currently have. The equipment rental is around 125 a month, and the setup is around $350. This is now the most likely route we will take. This also comes with 5 static IPs to point to the firewall, NVR, and a couple of cameras we want to be public.
The point to point would require us clearing some 60ft trees, which required two towers be built. At 15k a tower, that became too much for us to budget.
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Yikes. Yeah, building your own backhaul infrastructure is expensive. Sounds like you've got a good deal to hook into what is essentially a WISP. And sorry it took two weeks to get an answer here. =)
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Permalink Reply by Danny Nolan on
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Its no big deal, this is still a new community and I really hope this place can take off, as it has the potential of being a great resource for sysadmins, especially the little guys like myself.
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