Info on an 800m link with 2 x DLink AP-900+

[Darryl Smith]

People

FYI, 1-2% packet loss is a lot worse than it sounds. The thing is that
802.11 equipment does retries without informing the equipment at either end.
Thus, if you do a TCP/IP packet loss test (such as using PING), you will see
packets lost only if they have been lost a few times over the link. 

Darryl

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Darryl Smith, VK2TDS   POBox 169 Ingleburn NSW 2565 Australia
Mobile Number 0412 929 634 [+61 4 12 929 634 International] 
Darryl at radio-active.net.au | www.radio-active.net.au  

-----Original Message-----
From: wireless-bounces at lists.samba.org
[mailto:wireless-bounces at lists.samba.org] On Behalf Of Jason Hecker
Sent: Monday, 26 May 2003 10:44 AM
To: Haydn Lowe
Cc: wireless at lists.samba.org
Subject: Re: Info on an 800m link with 2 x DLink AP-900+


Hi,

I set up an 800m link with DWL-900AP+'s in bridge mode recently.  I used
Pacific Satellite antennas (24dBi).  The units came with firmware v2.1
installed.  I immediately upgrated it to v2.5 and after some trials and
tribulations with settings, settled on 25% power, right antenna and 22Mbit
and it flies.  Make sure you have long preambles on and WEP set to 256bit.  
I also had to channel hop a bit until I found a quiter channel which had the
least interference.  The Melbourne CBD seems quite noisy on the 2.4GHz band
now.  I have clear line of sight, and I think the antennas I used are a bit
of overkill, but I wanted to be sure it worked.  One antenna for a while was
stuck behind a silvered window and not line of sight to the other building's
antenna (brick warehouse in the way).  I managed to get this to work at
1-2Mbit with 2% packet loss until I was able to mount the antenna properly
on the roof - now it screams along.  Actual performance is the same as if I
dragged an 800m length of 10Mbit coax ethernet between the buildings.
Sweet!

-- 
Cheers,
jASON
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--== http://www.wireless.org.au/~jhecker ==--
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