I think it just falls to unsync'd - Jerry
From: wireless-boun...@wispa.org [mailto:wireless-boun...@wispa.org] On Behalf Of Josh Luthman Sent: Monday, January 10, 2011 9:59 AM To: WISPA General List Subject: Re: [WISPA] GPS Sync / or Sync between devices at site without GPS Question Am I right in guessing that higher latency will only cause some interference issues, nothing catastrophic? On Jan 10, 2011 11:54 AM, "Jerry Richardson" <jrichard...@aircloud.com<mailto:jrichard...@aircloud.com>> wrote: > Right, allows sync between GROUPS. GROUPS can be as large as you want as long > as the MASTER can be reached via Layer2 in less than 30ms. If you have two > GROUPS (for example two tower sites) that can hear each other but can't be > reached via Layer2 or latency goes above 30ms between them, then the MASTERS > at both towers will need to have fixed DL% > > UBNT's GPS implementation is a little different than we are used to, but I > like that they did away with the CMM concept. I am not sure I like the ide of > depending on one radio for MASTER sync information. I would like to see some > code that allows for failover. Something like: > - APRadio1 is MASTER/MASTER > - APRadio2 is SLAVE/MASTER > > The rest of the SLAVES in the group look at APRadio11 for sync info and if > it's not there look at APRadioMAC2 > > - Jerry > > From: wireless-boun...@wispa.org<mailto:wireless-boun...@wispa.org> > [mailto:wireless-boun...@wispa.org<mailto:wireless-boun...@wispa.org>] On > Behalf Of Mike Hammett > Sent: Monday, January 10, 2011 9:40 AM > To: WISPA General List > Subject: Re: [WISPA] GPS Sync / or Sync between devices at site without GPS > Question > > Ubiquiti's next software release is supposed to have dynamic ratios with sync. > > > > > ----- > > Mike Hammett > > Intelligent Computing Solutions > > http://www.ics-il.com > > > > On 1/10/2011 11:25 AM, Jerry Richardson wrote: > Yes, with wifi based radio systems you can see less throughput with sync than > without. > > With Canopy the DL% is fixed regardless if the AP is getting the sync pulse > from GPS or generating it itself. i.e. if you set the DL% to 75% it's fixed > regardless if the bandwidth is being used or not. > > With .11 radios the DL% is dynamic and will adjust according to demand (which > is why they are NOT in sync with other .11 radios). When you sync them, the > DL is no longer dynamic. So if you had a .11-based BH that has 90% downlink > traffic and force it to sync the DL% may only be 50% which would look like > half. > > Does that help? > > - Jerry > > From: > wireless-boun...@wispa.org<mailto:wireless-boun...@wispa.org><mailto:wireless-boun...@wispa.org<mailto:wireless-boun...@wispa.org>> > [mailto:wireless-boun...@wispa.org<mailto:wireless-boun...@wispa.org>] On > Behalf Of Jeromie Reeves > Sent: Monday, January 10, 2011 7:31 AM > To: > sc...@brevardwireless.com<mailto:sc...@brevardwireless.com><mailto:sc...@brevardwireless.com<mailto:sc...@brevardwireless.com>>; > WISPA General List > Subject: Re: [WISPA] GPS Sync / or Sync between devices at site without GPS > Question > > I do not know how the Radwin Sync works. With Canopy, you do not lose > bandwidth unless you do not have the timing the same. You can adjust settings > in such a way as to not step on yourself and still have different bandwidth > profiles with Canopy. > > I do not see why sync would lose any bandwidth, unless it is cause now you > only have X Transit tie and Y receive tie instead of X+%Y. > On Sun, Jan 9, 2011 at 2:03 PM, Scott Carullo > <sc...@brevardwireless.com<mailto:sc...@brevardwireless.com><mailto:sc...@brevardwireless.com<mailto:sc...@brevardwireless.com>>> > wrote: > For the first time I synchronized multiple devices (two backhauls) at a tower > site to see what it was all about. All of our gear in the past did not have > the capability to sync across devices to save spectrum and/or reduce > interference between local devices. > > In this case I used two Radwin 2000C backhauls with a sync cable between > them. Setting up the sync between them was easy however the first thing I > noticed was that the available bandwidth was cut in half. Is this typical of > all synced units? I guess there would be no more reduction in speed after the > first two radios synced because if there were more they would all fire at the > same time any way. Did I loose bandwidth because they were in MIMO mode > rather than Diversity mode or is the slowdown just a function of the timing > reduction to keep things clean? > > Is the UBNT GPS sync gear going to provide less throughput than I currently > experience when their new sync capable gear comes out? > > Thanks, just trying to get some feedback to learn more about how Syncing > devices affects their performance. > Scott Carullo > Technical Operations > 855-FLSPEED x102 > > Error! Filename not specified. > > > > -------------------------------------------------------------------------------- > WISPA Wants You! 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