That's what I thought you'd need and would happen. ----- Mike Hammett Intelligent Computing Solutions http://www.ics-il.com
On 6/14/2010 3:50 PM, Patrick Shoemaker wrote: > With standard FSK Canopy (7/14 Mbps) you can re-use frequencies on > back-to-back sectors only. There is no throughput hit for doing so. > > Think about what the GPS sync does- it causes all AP transmission > timeslots to occur simultaneously, and all receive timeslots to be > synchronized. So colocated APs will never be receiving while another is > transmitting, avoiding self-interference. However, SMs receiving from a > transmitting AP cluster must have enough separation between APs > transmitting on the same frequency so that the signal from the desired > AP is above the minimum SNR for the given modulation (10 dB for 2x mode) > when compared to another AP transmitting on the same frequency. This can > be achieved with a standard Canopy AP module by placing them back to > back--the front/back ratio on the antennas provides more than 10 dB > isolation. But a SM placed at the edge of two 60 degree sectors wouldn't > have nearly enough isolation between the two sectors if they were > running on the same frequency to maintain an acceptable SNR. > > So in short, you need three channels to run a standard 6 AP sector GPS > sync'd with Canopy. > > > Patrick Shoemaker > Vector Data Systems LLC > [email protected] > office: (301) 358-1690 x36 > http://www.vectordatasystems.com > > > Mike Hammett wrote: > >> Going in a different direction... >> >> Can you reuse a given frequency on every sector around a tower (4x or >> 6x), or are you limited to something less than that? Do you get full >> capacity on each sector, or are you limited to some percentage of that >> full capacity if you use the same channel all the way around? >> >> ----- >> Mike Hammett >> Intelligent Computing Solutions >> http://www.ics-il.com >> >> >> >> On 6/14/2010 11:19 AM, Mike Hammett wrote: >> >>> Other than Canopy, what systems also use GPS sync? >>> >>> >> >> -------------------------------------------------------------------------------- >> WISPA Wants You! Join today! >> http://signup.wispa.org/ >> -------------------------------------------------------------------------------- >> >> WISPA Wireless List: [email protected] >> >> 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: [email protected] > > 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: [email protected] Subscribe/Unsubscribe: http://lists.wispa.org/mailman/listinfo/wireless Archives: http://lists.wispa.org/pipermail/wireless/
