Re: Multipath WLAN problem?

Dave Platt wrote:
In article <zYjnl.20781$Ws1.2185@xxxxxxxxxxxxxxxxxxxx>,
Joerg <notthisjoergsch@xxxxxxxxxxxxxxxxxxxxx> wrote:

The 2nd AP may actually be a great idea. Thanks. Only thing is that the 'puters would have to be trained to switch when packet losses mount. Which is probably something a "modern" OS cannot deliver.

That's normally done by the chipset, its firmware, and the driver.

You'd set up the two APs on the same Ethernet segment, with the same
ESSID, on non-overlapping channels. When the PC scans and looks for
an AP for the ESSID it has been told to use, it'll normally try to
associate with the one having the stronger signal... which would be
your living-space AP if you're in that area.


However, that won't fix this problem. Strong signals don't mean much in multipath. Same with the TV where often an analog channel comes through strong and clear but their ATSC says "no signal".

It always connects alright and the signal is strong but then randomly cuts out anyhow, for about 30-60secs at a time. Very annoying. I tried to place the AP in different rooms but since they are all heavily insulated the problem is more or less always there. RF bouncing back and forth I guess. An AP smack dab in the living room would not likely pass the inhouse permit process, SWMBO would loudly object ;-)


There's sometimes a "sensitivity" adjustment (in the AP admin
settings) which can be used to give PCs a hint of how far apart the
different APs are, and thus at what point the PC card/firmware/driver
should decide to drop its current AP association and re-scan and try
again with a different AP.


I wish they'd look for data integrity instead. In multipath you can have a strong signal with lousy data integrity and a weak one that's excellent. For example, the local Ch29 digital almost has the field strength to light a CFL in the box but the picture falls apart all the time. A few Bay Area channels 100 miles away are weak but work most of the time. Of course, TVs don't have any data integrity indicators either so it's a wild guess whether you can watch a movie to the end or not.

--
Regards, Joerg

http://www.analogconsultants.com/

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