Auto On 1/29/2012 9:18 PM, Josh Luthman wrote: > Did you force modulations at all or are you letting it auto negotiate? > > Josh Luthman > Office: 937-552-2340 > Direct: 937-552-2343 > 1100 Wayne St > Suite 1337 > Troy, OH 45373 > > > > On Sun, Jan 29, 2012 at 9:16 PM, Scott Reed<sr...@nwwnet.net> wrote: >> This link is over 5 years old. XR5 cards will connect and pass a >> significant amount of data at -80 if the CCQ stays up. >> I am trying to figure out why a 5 year old link suddenly quits and new >> hardware doesn't fix it. >> >> >> On 1/29/2012 3:04 PM, Bryan Fields wrote: >> >> On 1/28/2012 17:05, Scott Reed wrote: >> >> RB433AH with XR5 at each end. >> Signals running around -69/-71. CCQ is the goofy one. Most of the time >> one direction is in the 50% range, but varies quite a bit. The other >> direction ranges from 16% to 100%. Generally if I see it getting close >> to 100% I know the link is going to drop. It comes right back up, >> usually at about 50%. >> I have tried 20MHz channels, 10MHz channels, 5MHz channels with about >> the same results from all. >> I have tried 5.2-5.3 frequencies and 5.7-5.8 frequencies. The higher >> frequencies work better, but still not well. >> >> I'm not that familiar with the ubiquiti products, but from the data sheet >> the radio will put out 23 dBm and requires a -74dBm signal to work (the data >> sheet does not say what channel size this measurement is from, I'll assume a >> 20 MHz channel). >> >> What strikes me is your normal RSL is is only 3dB more than the min RSL >> needed to link at 54 mbit/s. This is well within the normal variance of a >> radio path (+-3dB), and could be causing the radios to switch back and forth >> between data rates (only after taking some errors). It could be >> interference, but even 3dB of on channel interference is enough to raise the >> noise floor and lower your S/N radio (keep in mind in a ofdm radio the RSL >> numbers given assume a perfect noise free system, for ever dB of noise you >> have add a dB to your RSL). >> >> If you want a 54mbit OTA rate you need a much better signal for it to be >> reliable. If you need no less than a -74dBm signal, ensure you have a >> -60dBm or better signal (rule of thumb) during steady state operation. This >> will give you some head room for changes in the atmosphere (K value) and >> other issues that pop up from time to time. If you suspect interference, >> try to figure out if it's local or remote and where it's at. If you can use >> a HP dish to knock down off path noise, do it. When I was deploying >> backhaul radios in unlicensed space, I made HP dish's standard on all my >> links. >> >> Unfortunately this is not cheap to do things properly, but it will let you >> sleep easy at night. >> -- >> Bryan Fields >> APAC Imports LLC >> Phone: 800-721-6502 >> Fax: 727-493-1511 >> http://apacimports.com >> >> >> >> -------------------------------------------------------------------------------- >> WISPA Wants You! Join today! >> http://signup.wispa.org/ >> -------------------------------------------------------------------------------- >> >> WISPA Wireless List: wireless@wispa.org >> >> Subscribe/Unsubscribe: >> http://lists.wispa.org/mailman/listinfo/wireless >> >> Archives: http://lists.wispa.org/pipermail/wireless/ >> >> >> >> No virus found in this message. >> Checked by AVG - www.avg.com >> Version: 2012.0.1901 / Virus Database: 2109/4774 - Release Date: 01/29/12 >> >> >> -- >> Scott Reed >> Owner >> NewWays Networking, LLC >> Wireless Networking >> Network Design, Installation and Administration >> >> >> >> Mikrotik Advanced Certified >> >> www.nwwnet.net >> (765) 855-1060 >> (765) 439-4253 >> (855) 231-6239 >> >> >> >> >> -------------------------------------------------------------------------------- >> WISPA Wants You! Join today! >> http://signup.wispa.org/ >> -------------------------------------------------------------------------------- >> >> WISPA Wireless List: wireless@wispa.org >> >> Subscribe/Unsubscribe: >> http://lists.wispa.org/mailman/listinfo/wireless >> >> Archives: http://lists.wispa.org/pipermail/wireless/ > > -------------------------------------------------------------------------------- > WISPA Wants You! Join today! > http://signup.wispa.org/ > -------------------------------------------------------------------------------- > > WISPA Wireless List: wireless@wispa.org > > Subscribe/Unsubscribe: > http://lists.wispa.org/mailman/listinfo/wireless > > Archives: http://lists.wispa.org/pipermail/wireless/ > > > ----- > No virus found in this message. > Checked by AVG - www.avg.com > Version: 2012.0.1901 / Virus Database: 2109/4774 - Release Date: 01/29/12 > > >
-- Scott Reed Owner NewWays Networking, LLC Wireless Networking Network Design, Installation and Administration Mikrotik Advanced Certified www.nwwnet.net (765) 855-1060 (765) 439-4253 (855) 231-6239 -------------------------------------------------------------------------------- WISPA Wants You! Join today! http://signup.wispa.org/ -------------------------------------------------------------------------------- WISPA Wireless List: wireless@wispa.org Subscribe/Unsubscribe: http://lists.wispa.org/mailman/listinfo/wireless Archives: http://lists.wispa.org/pipermail/wireless/
