topic Re: reading the spectrum analysis in Wireless Questions and Best Practices

reading the spectrum analysis

joe_brown_72004 — Mon, 27 Apr 2015 23:28:41 GMT

Not familiar with the spectrum analysis, looking for information on what it is telling me.

Re: reading the spectrum analysis

munish_munish — Tue, 28 Apr 2015 10:41:53 GMT

hi Jbrown,

In general

Spectrum analysis provide in depth radio frequency interference analysis and the signal level view of the RF medium . It visualize the RF activity on 2.4ghz and 5ghz including Noise and interference sources.

It also provides the signal-level data and the impact of non-wifi device interference. spectrum analyzer is to capture a representation of the signal energy (quality of the signal, signal strength, reflections, noise and interference)in graphic format

Let me know if you have a product specific query on spectrum analysis.

Thanks
Munish

Re: reading the spectrum analysis

joe_brown_72004 — Tue, 28 Apr 2015 15:35:01 GMT

Here are 2 APs that are fairly close together and this was from production hours.

Re: reading the spectrum analysis

munish_munish — Tue, 28 Apr 2015 17:00:20 GMT

Hi Jbrown,

It is showing the view of received signal power across the band and the color coded using signal power (-110 to -20dbm). Week signal is the blue ==> Red .

It also shows that Cumulative Distribution of received power across the band . <20% blue ==> 80% Week signal (Red)

Re: reading the spectrum analysis

joe_brown_72004 — Tue, 28 Apr 2015 18:23:56 GMT

Great this has been helpful, Thanks.

Re: reading the spectrum analysis

john_d — Wed, 29 Apr 2015 03:58:11 GMT

The cumulative view tends to be more useful than the instantaneous view.

From my look at your cumulative view, it looks like you've got a lot of nearby 2.4GHz activity in the channel 1 and channel 8 ish region, while the area right below channel 6 tends to be least used.

The graph shows a heat map of what receive strengths are most often perceived at each frequency. A Ruckus AP generally has a noise floor on the order of -95 dbm or lower (e.g. more negative), so if you powered up your Ruckus in a completely clean environment you'd expect to see one big red line at -100 or so.