Or the signal is too hot? Chris Wright Network Administrator
-----Original Message----- From: Af [mailto:[email protected]] On Behalf Of George Skorup Sent: Friday, July 28, 2017 2:21 PM To: [email protected] Subject: Re: [AFMUG] Cambium 450b specifications My 3GHz SM at home is at about -60.5dBm and it's seeing 36/36 SNR and 8X downlink. Not perfect 256QAM, maybe only 15%, but most of the time it's decent. I am shooting through a 50 year old large maple tree too. I see 5GHz SMs that will run 8X with anything >35/35 SNR, and they're not near -56dBm either. Typically -58 to -64. Then I see others with like -55dBm, 40/42 SNR, <2dB SSR, yet they'll never run 8X downlink. I don't know what the hell it is with those. They're either lying or seeing some variable multipath that isn't reflected in the SNR reading fast enough. On 7/28/2017 11:48 AM, Joe Falaschi wrote: > Sure it would. We have some links reporting a SNR above 32db, enough to get > 8x but are weaker than -56 signals. So both matter. > > Joe > > > >> On Jul 28, 2017, at 11:44 AM, Chris Wright <[email protected]> wrote: >> >> Wouldn't SNR play a bigger role than general signal level? What good is >> -67.8dBm if the noise floor is -75dBm? >> >> Chris Wright >> Network Administrator >> >> >> -----Original Message----- >> From: Af [mailto:[email protected]] On Behalf Of Joe Falaschi >> Sent: Friday, July 28, 2017 9:28 AM >> To: [email protected] >> Subject: [AFMUG] Cambium 450b specifications >> >> We’re looking at some questions of why certain links are at certain >> modulations (uplink is better than downlink). It’s explained by the spec >> sheet of the current equipment and RX sensitivity. Basically the 450M AP >> can do more with less signal than the CPE can. Specs below. In any case we >> were then wondering what the new 450b RX sensitivity would be. There is a >> spec sheet on the Cambium website but this isn’t listed. Anyone have this >> information? >> >> 450M AP RX sensitivity >> 1x = - 93.5 dBm >> 2x = -88.6 dBm >> 4x = -81.5 dBm >> 6x = -75.9.0 dBm >> 8x = -67.8 dBm >> >> 450SM RX sensitivity >> 1x = -84 dBm >> 2x = -80.5 dBm >> 4x = -74 dBm >> 6x = -66.9 dBm >> 8x = -56 dBm >> >> 450i SM RX sensitivity >> 1x = -85.9 dBm >> 2x = -81.5 dBm >> 4x = -75.8 dBm >> 6x = -69.3 dBm >> 8x = -61.6 dBm >> >> Joe Falaschi >> e-vergent >>
