2000' Wireless Bridge?

Hi,

I need to link two LANs on a farm that are about 1500-2000 feet apart.

I've got line-of-sight (or can, once I prune a couple of trees).

Can anyone recommend a good wireless bridging solution? It's mostly to
share internet access, so I don't really need to go much faster than
few megabits per second. I know there's all sorts of pringle-can type
solutions but I'm looking for something out-of-the box.

The solution also needs to be fairly robust so I don't have to climb up
a ladder every day to reboot it or re-align a transceiver

Cheers,
Geoff Glave
Vancouver, Canada

A pair of Cisco BR1310 bridges with integrated 13dBi antenna (AIR-BR1310G-A-K9)
would meet your stated requirements.
http://www.cisco.com/en/US/products/...0802252e1.html

(You might find other products on which you will spend less, at least initially.)

Cheers,

Aaron

---


~ Hi,
~
~ I need to link two LANs on a farm that are about 1500-2000 feet apart.
~
~ I've got line-of-sight (or can, once I prune a couple of trees).
~
~ Can anyone recommend a good wireless bridging solution? It's mostly to
~ share internet access, so I don't really need to go much faster than
~ few megabits per second. I know there's all sorts of pringle-can type
~ solutions but I'm looking for something out-of-the box.
~
~ The solution also needs to be fairly robust so I don't have to climb up
~ a ladder every day to reboot it or re-align a transceiver
~
~ Cheers,
~ Geoff Glave
~ Vancouver, Canada

On 6 Jan 2006 09:01:06 -0800, (E-Mail Removed) wrote:

>I need to link two LANs on a farm that are about 1500-2000 feet apart.
>
>I've got line-of-sight (or can, once I prune a couple of trees).

You may need to do more than prune. You need what is called Fresnel
Zone clearance. At 2000ft, that's about 12 ft from the center line at
midpoint. See:
http://www.terabeam.com/support/calc...esnel-zone.php
If your Fresnel Zone hits the ground, trees, or other obstructions,
you will have signal loss, edge diffraction, and a generally flakey
signal.

>Can anyone recommend a good wireless bridging solution? It's mostly to
>share internet access, so I don't really need to go much faster than
>few megabits per second. I know there's all sorts of pringle-can type
>solutions but I'm looking for something out-of-the box.

Well, I'll assume that the remote end will have more than one computah
and will therefore require a transparent bridge. If there's only one
computah at the remote end, it might be easier and cheaper to use a
client radio and antenna, instead of a transparent bridge.

>The solution also needs to be fairly robust so I don't have to climb up
>a ladder every day to reboot it or re-align a transceiver

Well, with a fairly generic 10dBi antenna, you'll have a -3dB (half
power) beamwidth of about 30 degrees. Alignment isn't all that
critical until the gain goes above about 15dBi. By the time you get
to a 24dBi dish, you're looking at 5-7 degrees beamwidth, which is
really difficult to align and keep aligned in the wind.

I suggest:
| http://tranzeo.com/index.php?section..._section_id=44
| http://tranzeo.com/uploaded_images/1...f%20Series.pdf
which is a combination antenna, radio, PoE (power over ethernet), all
in one package. They're 802.11b not g so you'll get about
3.5Mbits/sec thruput maximum. It's quite a bit more expensive than
commodity solutions, but you didn't specify a price limit. If this is
too expensive, set a limit and I'll what can be thrown together,
err... engineered.

Also, there have been reports of some problems with Tranzeo hardware.
Search Google Groups in alt.internet.wireless for comments on these.
I've only installed two links with these and had no problems.

Incidentally, I did a quick calculation of the minumum antenna gain
you'll need at 2000ft with commodity hardware (+15dBm tx output).
11dBi antenna gain at each end is the theoretical minimum. If you
build your own, you'll need to know this.

--
# Jeff Liebermann 150 Felker St #D Santa Cruz CA 95060
# 831-336-2558 (E-Mail Removed)
# http://802.11junk.com (E-Mail Removed)
# http://www.LearnByDestroying.com AE6KS

On Fri, 06 Jan 2006 12:38:41 -0700, Aaron Leonard <(E-Mail Removed)>
wrote:

>A pair of Cisco BR1310 bridges with integrated 13dBi antenna (AIR-BR1310G-A-K9)
>would meet your stated requirements.
>http://www.cisco.com/en/US/products/...0802252e1.html
>
>(You might find other products on which you will spend less, at least initially.)

Ahem... $700 to $900 each end:
http://www.epinions.com/pr-Cisco_AIR...-A-K9-R_Bridge

--
# Jeff Liebermann 150 Felker St #D Santa Cruz CA 95060
# 831-336-2558 (E-Mail Removed)
# http://802.11junk.com (E-Mail Removed)
# http://www.LearnByDestroying.com AE6KS

In article <(E-Mail Removed)>, (E-Mail Removed) wrote:
>On Fri, 06 Jan 2006 12:38:41 -0700, Aaron Leonard <(E-Mail Removed)>
>wrote:
>
>>A pair of Cisco BR1310 bridges with integrated 13dBi antenna
> (AIR-BR1310G-A-K9)
>>would meet your stated requirements.
>>http://www.cisco.com/en/US/products/...186a00802252e1
>.html
>>
>>(You might find other products on which you will spend less, at least
> initially.)
>
>Ahem... $700 to $900 each end:
> http://www.epinions.com/pr-Cisco_AIR...-A-K9-R_Bridge
>

Jeff on this subject, if thru put over the net connection doesn't have to
be 'all that high' how well do these 900Mhz devices you see on the net
work? For moderate distances again where you are say trying to network at
'better then dial-up' is this a viable option? Seems like at 900Mhz, you
have a more robust signal though at a price of lower bandwidth.

fundamentalism, fundamentally wrong.

(E-Mail Removed) (Rico) hath wroth:

>Jeff on this subject, if thru put over the net connection doesn't have to
>be 'all that high' how well do these 900Mhz devices you see on the net
>work? For moderate distances again where you are say trying to network at
>'better then dial-up' is this a viable option? Seems like at 900Mhz, you
>have a more robust signal though at a price of lower bandwidth.

How about starting a new thread next time you change the subject?

I've been trying to sell the local ISP's into providing 900MHz service
in the forests of Santa Cruz mountains. The idea is to provide low
speed service sufficient to run a slow (about 60Kbits/sec thruput)
internet connection or a single VoIP channel. There's some small
interest, but most users demand broadband. I had quite a bit of
experience with 900MHz propogation dealing with Metricom (Ricochet)
and Waverider modems. They work just fine but note that they were
mostly 1watt (+30dBm) radios. Basically, they go right through the
trees.

You can sometimes find a pair of the old Metricom modems on eBay.
They'll talk to each other point to point at about 25Kbits/sec
thruput. Range varies with antennas, but a mile with a pair of small
circuit board yagis is no big deal.

Incidentally, the Peoples Republic of Santa Cruz County has a 900Mhz
data system used to replace the phone lines used by the State Lottery
machines. You can see the yagi antennas at many local gas stations
and convenience stores.

There are a bunch of different types of 900MHz radios available. Which
one are you referring to?

http://www.ricochet.net
http://www.waverider.com
http://www.avalanwireless.com
http://www.freewave.com
(etc...)

--
Jeff Liebermann (E-Mail Removed)
150 Felker St #D http://www.LearnByDestroying.com
Santa Cruz CA 95060 http://802.11junk.com
Skype: JeffLiebermann AE6KS 831-336-2558

In article <(E-Mail Removed)>, Jeff Liebermann <(E-Mail Removed)> wrote:
>(E-Mail Removed) (Rico) hath wroth:
>
>>Jeff on this subject, if thru put over the net connection doesn't have to
>>be 'all that high' how well do these 900Mhz devices you see on the net
>>work? For moderate distances again where you are say trying to network at
>>'better then dial-up' is this a viable option? Seems like at 900Mhz, you
>>have a more robust signal though at a price of lower bandwidth.
>
>How about starting a new thread next time you change the subject?
>
>I've been trying to sell the local ISP's into providing 900MHz service
>in the forests of Santa Cruz mountains. The idea is to provide low
>speed service sufficient to run a slow (about 60Kbits/sec thruput)
>internet connection or a single VoIP channel. There's some small
>interest, but most users demand broadband. I had quite a bit of
>experience with 900MHz propogation dealing with Metricom (Ricochet)
>and Waverider modems. They work just fine but note that they were
>mostly 1watt (+30dBm) radios. Basically, they go right through the
>trees.
>
>You can sometimes find a pair of the old Metricom modems on eBay.
>They'll talk to each other point to point at about 25Kbits/sec
>thruput. Range varies with antennas, but a mile with a pair of small
>circuit board yagis is no big deal.
>
>Incidentally, the Peoples Republic of Santa Cruz County has a 900Mhz
>data system used to replace the phone lines used by the State Lottery
>machines. You can see the yagi antennas at many local gas stations
>and convenience stores.
>
>There are a bunch of different types of 900MHz radios available. Which
>one are you referring to?

None in particular, the reason I didn't alter the subject, was the question
was about bridging 2000 feet. There are as you noted in other posts in this
thread issues with that distance at 2.4Ghz. I was just wondering if one can
live with a reduced thruput if one of the 900Mhz systems would get the job
done for a half mile to a mile or so.

Thanks btw.

>
>http://www.ricochet.net
>http://www.waverider.com
>http://www.avalanwireless.com
>http://www.freewave.com
>(etc...)
>

fundamentalism, fundamentally wrong.