APs are Linksys wap11, version2.2 originally , bridge mode. It took me a few months and many firmware changes forward and backward before I realised what total crap linksys sells. The first problem with the link was the inability of the protocol in the linksys radios to accomodate large link length. Each packet sent would be resent 40 to 50 times because of what I deemed to be a rigid AckWindow. One ping would result in 50 DUP replies. Throughput was around 400-500 kbit/sec.
As a possibly suicidal firmware upgrade I flashed the Dlink-900AP+ firmware into the linksys. This reduced the resends down to a mere :-) 11 retries per packet. One ping now gives 11 DUPs. Throughput has gone to 600-700 kbits/sec. It was after that change in the firmware that I began to study the tidal induced outages. Have gathered only about 6 running weeks of data. Another wireless link operator here has higher elevation over water than I do, and he is using SMC radios over a shorter path (6.5km). His link does not go down, but he has paid attention to his link quality and that quality decreases as the high tide reaches its peak. I expect the tidal effects on radio propogation would remain in place without at least one diversity antenna on one end of the link. Thanks for the reference to the wet11, I note I can change the wireless card therein, so I might consider that. I would be ridiculed locally for buying another linksys, though. ------------------ andy barlak On Sat, 1 Nov 2003, Jon King wrote: > I don't know. > I saw your graph, but I know that from my own extended experience with wap > 11's that the problem is more likely in your AP's. > I've been up and down with wap11's and distance links and the only good > conclusion is that if you need a reliable link over distance, don't buy > linksys. > I suffered through one and a half years of broadcasting across my > neighborhood (about 1 mile) and that link wen't down for all sorts of > reasons. > temperature, firmware, user traffic (one guy knocked me offline evertime he > would try and update his Tivo across my network), 2.4 ghz phones, > neighboring AP's and again firware. > > it's been a while since I saw the original post, can you refresh my memory: > 2 wap11's, what mode are they in? > I'd start with a little science project and replace one radio with a wet11. > perhaps both. > anyone had any experience with distance links and using two wet11's? > with the right firmware I've found they can restore a failing link on their > own better than the wap11's. > > > ----- Original Message ----- > From: "Brian Lloyd" <[EMAIL PROTECTED]> > To: "Jeff King" <[EMAIL PROTECTED]> > Cc: "Greg DesBrisay" <[EMAIL PROTECTED]>; "Andy Barlak" > <[EMAIL PROTECTED]>; <[EMAIL PROTECTED]> > Sent: Saturday, November 01, 2003 2:15 AM > Subject: Re: [BAWUG] wireless tidal outages over water > > > > Perhaps it is just the fresnel zone changing as the height of the water > changes. > > -- > > > > Brian Lloyd 6501 Red Hook Plaza, Suite 201 > > [EMAIL PROTECTED] St. Thomas, VI 00802 > > +1.340.998.9447 - voice +1.360.838.9669 - fax > > GMT-4 > > > > -- > > general wireless list, a bawug thing <http://www.bawug.org/> > > [un]subscribe: http://lists.bawug.org/mailman/listinfo/wireless > ------------------------------------------------------------------------------- Andy Barlak On my desk I have a work station. Trains stop at train stations. -- general wireless list, a bawug thing <http://www.bawug.org/> [un]subscribe: http://lists.bawug.org/mailman/listinfo/wireless
