I don't have the calcs handy atm but it was calculated 5x9 at 2048QAM. Short link though, 3.5 miles with 3'/4' dishes, RSL low 30's. Quite aware of how quick 2048 will drop down, and 80mhz channels would have given more wiggle room to drop rates and still maintain 1Gbps but there was a time crunch for the project and the 60mhz heads were in stock. Even at 256QAM the throughput is adequate *for this particular application* if the fade is worse than calcs.
On Tue, Oct 28, 2014 at 6:22 PM, Eric Kuhnke via Af <af@afmug.com> wrote: > yeah, 2048QAM, but what is your fade margin from the threshold required to > run at 2048QAM vs. when it will step down to 256QAM and no longer be a 1 > Gbps radio? > > If I recall right an IP20C requires an RSSI of something like -57.5 to > operate at 2048QAM and will become a 256QAM radio at -63 or thereabouts. Not > much fade margin. Not something you can reliably predict as a five nines > true 1Gbps link pretending to be a fiber patch cable between two routers. > > Unless you're running it at sub-4km distances with 60cm size antennas and > the normal RSL is -35.0.... > > > > On Tue, Oct 28, 2014 at 5:40 AM, Caleb Knauer via Af <af@afmug.com> wrote: >> >> We just put up a Ceragon IP20c link last week, 3.5 miles, one 60Mhz >> frequency pair, 1030Mbps full duplex using 2048QAM, uses two cores >> (same frequency) in a single FODU chasis and a combiner on the >> antenna. Looks like any other single FODU install, very clean. Not >> inexpensive however. >> >> On Tue, Oct 28, 2014 at 7:02 AM, Matt Jenkins via Af <af@afmug.com> wrote: >> > Cambium PTP820c >> > Exalt ExtremeAir >> > >> > Both will give you 1gig in a single radio. >> > >> > Matthew Jenkins >> > SmarterBroadband >> > m...@sbbinc.net >> > 530.272.4000 >> > >> > On 10/27/2014 03:25 PM, Peter Kranz via Af wrote: >> >> >> >> >> >> Has anyone shopped full Gig licensed links lately, which is the best >> >> bargain? >> >> >> >> *Peter Kranz >> >> *Founder/CEO - Unwired Ltd >> >> www.UnwiredLtd.com <http://www.unwiredltd.com/> >> >> Desk: 510-868-1614 x100 >> >> Mobile: 510-207-0000 >> >> pkr...@unwiredltd.com <mailto:pkr...@unwiredltd.com> >> >> >> > > >
