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(Disclaimer: I am not entirely sure about the exact difference between 'carrier' and 'operator' in this context. Our SIM provider calls them 'networks'. In this post I use 'operator', as that seems to be term the Teltonika web interface is using)

We are using "unsteered multi-network SIMs" as one can get them e.g. from RiteSIM or Pangea. They work just fine in a RUT240.

I noticed that after each power cycle, the RUT240 picks a different operator, eventually cycling through 3 available UK operators. The location of the RUT240 or its antenna didn't change, and I would think that the signal strengths of the available operators didn't either.
So how exactly does the RUT240 select the operator?
And what happens if reception deteriorates, does it automatically fall back onto the next operator? Or would I have to setup a separate mechanism, like 'ping reboot'?

Kind regards, Nils

Model: RUT240
Firmware: RUT2XX_R_00.01.14
Operators: UK EE/O2/Vodafone/3
SIM provider: RiteSIM

1 Answer

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RUT240 does select operators based on connection quality at the moment. You could manually lock your router to connect to single operator by using operator scan feature: https://wiki.teltonika-networks.com/view/RUT240_Mobile#Scan_For_Network_Operators


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> RUT240 does select operators based on connection quality at the moment.

I don't think that is the case. I did a number a power cycles, and without any changes to settings or hardware, the RUT240 went through various operator/cells:

  • Vodafone -> Three -> EE (Cell A) -> O2 -> EE (Cell B) -> Vodafone -> EE (Cell C)-> ...

The different carriers (and to a lesser extent the different EE cells) have quite different signal strength at the location of testing! Here are the outputs of gsmctl  --serving after each power cycle & some settling time:

+QENG: "servingcell","NOCONN","LTE","FDD",234,15,246831,484,2850,7,5,5,FE9F,-93,-6,-66,19,-
+QENG: "servingcell","NOCONN","LTE","FDD",234,20,1F100,399,1392,3,4,4,541,-116,-15,-82,9,-
+QENG: "servingcell","NOCONN","LTE","FDD",234,30,2C0E01,134,1617,3,5,5,2C75,-107,-13,-75,9,-
+QENG: "servingcell","NOCONN","LTE","FDD",234,10,7A1F36E,356,6400,20,3,3,1010,-99,-13,-69,13,-
+QENG: "servingcell","NOCONN","LTE","FDD",234,30,2C0E03,133,1815,3,5,5,2C75,-110,-13,-79,12,-
+QENG: "servingcell","NOCONN","LTE","FDD",234,15,246831,484,2850,7,5,5,FE9F,-90,-6,-64,21,-
+QENG: "servingcell","NOCONN","LTE","FDD",234,30,2C0E00,133,1617,3,5,5,2C75,-110,-13,-75,9,-

As you can see from the last 5 columns (<rsrp>,<rsrq>,<rssi>,<sinr>,- according to this forum posting ) the signal strength varies quite a bit.

So how is the RUT picking the cell?