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
