What usb device did you use?I did a test with USB2 and USB3 transfer.
Send and receive file (Win10_21H2_English_x64) from windows 10 to and from my SSD drive.
Here is the result. Noise on 2,4Ghz radio increased from -~92dBm to -~84dBm.
USB2 - test
View attachment 40937
View attachment 40938
USB3 - test
View attachment 40939
View attachment 40940
Yes, as my signature.Assuming this is on the RT-AX86U?
Crucial CT250MX500SSD1 250 GB and External Hard Disk Case UGREEN USB C 3.1 Gen 2 HDDWhat usb device did you use?
Was this the only difference you noticed?Here is the result. Noise on 2,4Ghz radio increased from -~92dBm to -~84dBm.
Was this the only difference you noticed?
Given that the lowest 2.4GHz noise level on my RT-AX86U is -76dBm I think it's safe to say the difference is negligible.
Sorry I wasn't clear in my reply. I wasn't trying to recreate your experiment.Interesting that you have ~ 8db difference in noise level.
You could tune the noise a bit by moving the connection cable to the SSD disk and placed Disk Case in front of the router.
Noted that if you have a usb cable connected to the other usb socket, the noise threshold was a little lower.
I understand it was from your environment.Sorry I wasn't clear in my reply. I wasn't trying to recreate your experiment.
Good to know that the file transfer was not affected by such a relatively high noise level.If I remove the flash drive completely the noise level is -86 dBm.
In all cases the noise level is so low that it doesn't change the throughput when performing a file transfer.
RSSI SNR General Rating
------ ------- ----------------------
-45dBm +31dBm Very Good (a)
-50dBm +26dBm Still Good (a)
-55dBm +21dBm Fair to Poor (b)
-60dBm +16dBm Barely Adequate (c)
Note that while it's certainly important to know the noise level reported by the WiFi radios, the value alone, by itself, is not very meaningful because it simply indicates the amount of background noise detected in your wireless environment *without* any context to indicate the actual overall "health" of your WiFi client's signal.
The more relevant and meaningful value is the "Signal to Noise Ratio" (SNR). The SNR (which is a misnomer since it's not a ratio at all) compares the level of the WiFi signal strength to the level of background noise, and it's calculated by taking the client signal strength and subtracting the detected noise level. As a general rule, values of +25dBm to +30dBm are considered to be good for overall signal quality & reliability; values greater than +30dBm are the desirable range.
Yeah, I understand. The threshold where a bad or poor SNR becomes good, or at least acceptable, is not quite written in stone. I've seen different manufacturers of WiFi equipment and/or network monitoring/diagnostics tools give different threshold levels at which the WiFi signal is "good" or better, depending on your goals (e.g. reliable signal for data vs. voice applications). That's why they usually refer to them as "general rules."Hello
I do not really feel that your explanation agrees with my opinion.
My opinion is according to this statement from Cisco.
Where the difference between Noise and signal should be 20dB (SNR) or more.
Cisco SNR
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