How to debug WiFi problems? (Understanding Signal / Noise / Rate)

Since the Wifi experience seems worse with the Omnia than with the previous router, I try to investigate. Whithout knowing anything about radio makes it of course challenging.

In the Luci interface, I note these indicators:

Signal / Noise RX Rate / TX Rate
 (  -58 / -104 dBm 72.2 Mbit/s, 20MHz
 ( -58 / -104 dBm 2.0 Mbit/s, 20MHz
 ( -50 / -104 dBm 1.0 Mbit/s, 20MHz
( -62 / -104 dBm 52.0 Mbit/s, 20MHz

How to interpret them? Are they “good” or “bad”?

Youre example is 2,4 or 5 ?

I think if this signal level is good. 40-50 dB is very near by router, 60 dB i standard, 70 dB is poor but you can to use.

Your example evaluates the signal quality and location of the clients (mobile, tablet, printer) - power nad antenna. No router quality !

Some devices are in sleep mode without active transport - sleeping maybe.

Noise is good - no microwave oven i function :slight_smile: )

Technical details that I forgot.

I use 2.4 Ghz because, unlike what some people say, there are still many devices that cannot do 5 Ghz.

iwinfo wlan0 scan show 33 cells in activity.

#  iw reg get
country FR: DFS-ETSI
	(2402 - 2482 @ 40), (N/A, 20), (N/A)
	(5170 - 5250 @ 80), (N/A, 20), (N/A)
	(5250 - 5330 @ 80), (N/A, 20), (0 ms), DFS
	(5490 - 5710 @ 160), (N/A, 27), (0 ms), DFS
	(57000 - 66000 @ 2160), (N/A, 40), (N/A)

# cat /etc/config/wireless 
config wifi-device 'radio0'
	option type 'mac80211'
	option path 'platform/soc/soc:pcie-controller/pci0000:00/0000:00:02.0/0000:02:00.0'
	option disabled '0'
	option hwmode '11g'
	option htmode 'HT20'
	option channel 'auto'
	option txpower '20'
	option country 'FR'
	option distance '20'

System log shows things like:

2016-12-18T14:25:17+00:00 debug kernel[]: [39285.623144] ath10k_pci 0000:02:00.0: ath10k_pci ATH10K_DBG_BUFFER:
2016-12-18T14:25:17+00:00 debug kernel[]: [39285.623155] ath10k: [0000]: 0265F270 10004C1D 00437860 00000001 00000000 00000140 0265F270 10004C1D
2016-12-18T14:25:17+00:00 debug kernel[]: [39285.623160] ath10k: [0008]: 00437860 00000001 00000004 00000140
2016-12-18T14:25:17+00:00 debug kernel[]: [39285.623164] ath10k_pci 0000:02:00.0: ATH10K_END

Signal strength of -104 dBM indicates that you have a problem somewhere, either in your neighborhood due to overcrowded frequency spectrum and/or settings or a problem with your TO. First thing I would try is removing the anttena’s, opening the TO and disconnect and reconnect the wifi cards, closing it and reattach the antenna’s again.

A very rough table of dBm values (ripped from Metageek)

< -90 dBm - Unsuable
-90 - -80 dBm - Not Good
-80 - -70 dBm - Okay
-70 - -67 dBm - Very good
-67 - -30 dBm - Amazing

Can you give more information about your environment (router placement, type of house, etc) since without this information we cannot deduce what and why it is happening?

It is the noise level if you look again the readings bortzmeyer provided.

If you are using the AC card (the larger card) for 2.4 GHz you should not do that unless you rewire the antenna cabling.

Reading can be hard :blush:
So the values are considered good.

You highlight the topic as resolved ?

Why? It is not resolved.

Here is the cabling (picture taken when receiving the Omnia):

Opening the box, I noticed that some cables went disconnected (the gold connectors of the antenna were not properly fixed, the small cards rotated and apparently unplugged some cables). I fixed it but it changed nothing to the results.

I tried the 5Ghz setup and, indeed, things seem much better, even in remote corners of the house.

I configured the second WiFi interface to use 2.4 Ghz (apparently, from the Foris Web interface , it is not possible to use two different frequencies for two Wifi networks, I used Luci), to accomodate my old Fairphone 1.

So, pending future tests, it seems OK now.