Hello there,
seems like the SINR reading for my RG520F-EU modem is wrong - it often reports values like -32768, but my average SINR of my otherwise pretty stable 5G NSA connection has always been between 12 to 14 dB. I could see other user here reporting this issue for another Quectel 5G modem, where SINR reading was okay with previous firmware… My current firmware version is RG520FEUEAR03A03M4G (I am using a Chateau 5G R16).
Can you please look at it and issue a fix in the next firmware version? Or has a newer firmware already been released for RG520F-EU?
Many thanks in advance,
Mikey
Which command did you use for query?
It’s invalid in either AT+QENG=“servingcell” or AT+QSINR.
What I have also observed, that the longer the connection is up (and the connection is pretty stable all the time as I have mentioned earlier - no issues whatsoever), the more these -32768 values are starting to occur in further consecutive readings.
For example, all of sudden, after ten hours of connection uptime, I can see getting “nonstop” -32768 values in these readings for a longer period of time (half hour, hour), with no “standard” values (which in my case are in average 12-14dB) in-between.
Re-enabling the connection or running SpeedTest partially “corrects” the issue - the readings return back to my average 12-14dB but with -32768 values here and there.
Either way, to me, -32768 value looks invalid. So I strongly suspect that something is off here.
Thanks for looking into it.
Can you provide related logs or screenshots?
^ That was from yesterday. Now, I am attaching newest from today after ~15 hours of session uptime, and the -32768 SINR reading is still there for almost a hour now and doesn’t want to change:
This clearly doesn’t look normal.
@herbert.pan-Q Have you had the time to look into it? It’s still reporting this strange -32768 values. For real SINR monitoring, it’s totally unusable. Thanks in advance.
I think the output result is normal, the current LTE gives invalid value, NR5G output is normal value; You can try to lock the current network to LTE and then print the SINR results
I disagree. Let me finally give you my three arguments why I think it’s wrong:
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Another user on this same forum has reported the very same problem (with his 5G Quectel modem, albeit different model) where he reported this issue wasn’t there with previous firmware.
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Before I switched to RG520F-EU, I had been using Quectel EG12-EA which had been literally cell-locked with every connection to the very same bands (B1, B3, B28) and very same BTS for almost three years, and I never ever had such invalid readings of SINR value (-32768).
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Reading your own Quectel_RG50xQ&RM5xxQ_Series_AT_Commands_Manual_V1.1.1 PDF, the SINR metric, across the manual, for both LTE or 5G NR must be within range -20 to 30dB (!!) - this simply implies -32768 value for SINR is invalid:
Also, never ever in this document is a -32768 value mentioned.
Can you please acknowledge this is a real issue and have your engineers look into it? Thank you very much.
My MikroTik Chateau 5G R16 (RG520F-EU) has just received a firmware updated that seems to have fixed the SINR readings.
@nicsmith1979 Thanks, that’s great to hear, I will try it too. What is your current FW version then?
@MikeyJay FW version is RG520FEUEAR03A04M4G, it took a while to update.
I managed to update to the latest firmware today, and with 5 hours of uptime with this firmware (RG520FEUEAR03A04M4G), I can report no more “invalid” SINR readings. So it seems this issue has been fixed there.
