Re: Wireless Bridge
- From: Jeff Liebermann <jeffl@xxxxxxxxxxxxxxxxxxxxxx>
- Date: Fri, 28 Apr 2006 00:03:44 GMT
On 27 Apr 2006 09:50:53 -0700, jvolckaert@xxxxxxxxx wrote:
I have a couple of wireless bridges using various APs like the Dlink
3200AP, Dlink DWL900+, Dlink 2100, Netgear WAG102, etc. I have
external antennas on all of them. My longest bridge is about 2 miles.
None of thses have signal strength when in PTP Bridge mode. Is anyone
aware of an inexpensive AP which does?
Some possibilities:
The DWL-900AP+ supports SNMP which might have signal strength. I'll
check when I get home. MIB file for DWL-900AP+
http://www.LearnByDestroying.com/crud/DWL900APMIB.mib
The DWL-3200AP is a managed access point and most certainly support
SNMP.
All 802.11 management packets contain a field that has the signal
strength. If you could sniff the traffic with a passive sniffer, you
could extract the signal strength. I think (not sure) that Kismet,
under Linux, will do this.
Also, The 3200AP has dual antennas and runs in PtMP mode with three
2100APs. Can I have two antennas on it pointing in different
directions?
No, or at least probably not. The two antennas are intended for
diversity reception, not to act as a repeater for clients on different
antennas. The problem is that the access point often doesn't switch
between antennas quick enough. It really depends on the algorithm
used by whatever chipset is inside the DWL-3200AP. Sometimes it
works, but my experience has been dismal.
I fixed one such problem with a power splitter connected to two
antennas. Not the best or cheapest, but good enough.
http://www.hyperlinktech.com/web/signal_splitters_2400_2way.php
Usually, I just add another access point with one antenn on each
access point coverage area.
I have a directional antenna which points back to the main
building and an omni which I use to connect two building which are
about 500' from the tower the 3200AP is on.
Try measuring the performance going through this arrangement. In
other words, going in one antenna, through the DWL-3200AP, and out the
other antenna to the main building. If you get truely disgusting
performance, it's not going to work.
Also(2), I have a problem with the Dlink bridge when I move large files
accross it.
What does "across it" mean as opposed to "through it"? Please
describe the path the files follow.
I have a video security server which generates video which
are anywhere from 5-50M in size. When I watch the video it will freeze
the bridge. I've tried doing a ping test during it and the pings
skyrocket and I get all kinds of lost packets.
Lost packets almost always means interference. Have you checked for
other users on your selected channel? See the FAQ at:
| http://en.wikibooks.org/wiki/FAQ_for_alt.internet.wireless/Wi-Fi#Interference
--
# Jeff Liebermann 150 Felker St #D Santa Cruz CA 95060
# 831-336-2558 jeffl@xxxxxxxxxxxxxxxxxxxxxx
# http://802.11junk.com jeffl@xxxxxxxxxx
# http://www.LearnByDestroying.com AE6KS
.
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