----- Original Message -----
From: "Blair Davis" <[EMAIL PROTECTED]>
To: "WISPA General List" <[email protected]>
Sent: Wednesday, February 08, 2006 9:03 AM
Subject: Re: [WISPA]Farmers Wanting full Farm Coverage
Why not use the same essid on all your towers? That works for me.
It'll cause trouble when there's more than one ap per tower. The cpe will
tend to "hunt" from ap to ap casing flaky performand and outages.
Then there's the small problem of using a tower to feed another small tower.
If you use the same essid the two local systems will hook up to each other
rather than the previous tower in line.
Or use MikroTik AP's with a secondary essid that is the same on every
tower just for roaming users.
I've got 6000 square miles of coverage. Changing out all devices isn't an
option.
Most of the "tower sites" are very, uh, crude. Hostile may be a better
word. I use my system to test gear so I can tell you guys what'll hold up
and what won't, even when you do things you shouldn't.
And you've missed the whole point in the first place..... My solution to
this problem allows the use of EXISTING infrastructure from MULTIPLE
providers. Think cell phone system evolution here guys.....
Marlon K. Schafer (509) 982-2181 wrote:
As an FYI, we've had wifi in cop cars since 2002. They get 15 MILES and
can roam from tower to tower as well.
http://www.odessaoffice.com/wireless/mobile.htm
We used to just use the essid of ANY and they'd tie into any of my towers
that they could see. That no longer works due to all of the local wlans
out there. As soon as someone FINALLY builds me a smart cpe that can be
told to associate with a list of 3 dozen or so ap's this mobile wifi
stuff is really gonna take off for applications like this!
Laters,
Marlon
(509) 982-2181 Equipment sales
(408) 907-6910 (Vonage) Consulting services
42846865 (icq) And I run my own wisp!
64.146.146.12 (net meeting)
www.odessaoffice.com/wireless
www.odessaoffice.com/marlon/cam
----- Original Message ----- From: "James McKinion"
<[EMAIL PROTECTED]>
To: <[email protected]>
Sent: Tuesday, February 07, 2006 2:58 PM
Subject: Re:[WISPA]Farmers Wanting full Farm Coverage
We have had two commercial cotton farms in Mississippi under complete
wireless local area network coverage for about 3 years in a current
demonstration project for precision agriculture applications. The farm
in eastern Mississippi has about 1600 acres of contiguous farmland with
gently rolling land. We used Alvarion BreezeAccess II equipment with an
omni antenna at thebase station to communicate to three repeater station
located at the edges of the farm. Directional panel antennas connected
to BreezeAccess II 2.4 GHz radios which then went to Breezecomm radios
connected to 120 degree sector antennas which broadcast into the farm to
the equipment in the fields. THe farm equipment was equipped with
Breezecom radios attached to omni antennas. All of these radios are
frequency hopping spread spectrum radios. These have a range of about
2.5 miles talking from sector antennas to omnis. Wifi will onlu have a
range of 1500 feet talking to omnis. An omni antenna is the only cost
effective practical device to put on a tractor, combine or truck. The
other reason we chose Alvarion is that their radios automatically handle
mobility. That is, they can automatically hand over communcation from
sector to sector as boudaries are crossed with loosing connection or
packets of data. This system has a user data rate of 2 Mbps. The base
station has a Starband satellite link to the Internet. We have also used
DirecWay satellite links.
The other farm is located in the Mississippi Dellta and is set up
similarly with the exception being that the communication from the base
station to the 9 repeater stations is handled using the Waverider 900 MHz
radios. This farm consists of over 12000 acrs of cotton farmland
separated by various tree lines and is roughly oval shaped with the major
axis being 12 miles from side to side with the farm headquarters situated
in the middle. We needed the 900 MHz radios to penetrate the trre lines
to reach the Breezecom repeaters with 120 degree sector antennas to
provide field coverage. THe siganl from the base station reaches almost
10 miles so the entire farm is covered by the base station. However, you
must use yagi antenna precisely aimed to get reception. Thus, the use of
the repeater station using Alvarion Breezecom as before.
I can sen you a copy of the research paper we published if this is of
further interest to you.
James
Dr. James M. McKinion
USDA-ARS
Genetics and Precision Agriculture Res. Unit
P. O. Box 5367
Mississippi State, MS 39762
Ph: 662-320-7449
FAX: 662-320-7528
Email: [EMAIL PROTECTED]
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