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RUT955 H7V3C0 (EU) - troubleshoot mobile network issue: registered, but not connecting

0 votes
252 views 1 comments
by anonymous
This modem was working fine for years, but all of a sudden it can not connect to the mobile ISP due to signal strength issues.

Right now it tells me that it is being registered on 3G WCDMA 850, some bytes sent, none received.
Signal strength -101dBm, RSCP -101dBm, Ec/Io -10dBm.
Network operator Telstra (Australia).

Another unit RUT955_M7V3S0 (AU) on the very same antenna and position gives me 4G LTE BAND 28 and is registered and connected.
Signal strength -83dBm, RSRP -120dBm, RSRQ -17dBm, SINR -5.1dBm
Network operator Telstra (Australia).

If I force the RUT955_M7V3S0 (AU) onto 3G only (Network > Mobile > Network Frequency Bands set to Manual and then selecting WCDMA 850, WCDMA 900 and WCDMA 2100 only) its being registered on 3G WCDMA 850 only, not connected, some bytes sent, none received.
Signal strength -102dBm, RSCP -102dBm, Ec/Io -9dBm.
Network operator Telstra (Australia).

So, how can I troubleshoot this issue?

RUT955 H7V3C0 (EU) is capable of WCDMA 850, 900, 2100 and LTE B1, B3, B5, B7, B8, B20, B38, B40 and B41.
RUT955_M7V3S0 (AU) is capable of WCDMA 850, 900, 1900, 2100 and LTE B1, B2, B3, B4, B5, B7, B8, B28 and B40.

The tower I got here to test is ( https://web.acma.gov.au/rrl/site_search.site_lookup?pSITE_ID=21713 )
To me this looks like (Telstra) 700MHz and 800MHz and (Optus) 700MHz and 1800MHz.

I know that for 4G I need Band 28 here.
But 3G was fine so far.. question for me is, how can I find out what fails for 3G and why?
Are there any logs/CLI commands I can use to see what is going on?
by anonymous
Just for info.. another modem (RUT955 H7V180 (EU)) in the field (connecting to another tower here in Australia) works fine on LTE BAND 3 (ISP Telstra).

1 Answer

0 votes
by anonymous

You appear to be using 3G network which is being decommissioned.  The below changes the modem to the 4G LTE network (assuming you are Telstra or it may not work).

Network > Mobile > General

  • SIM 1 - Service mode ==> select 4G LTE
  • Network Frequency Bands, connection method ==> manual, tick LTE B7 and tick LTE B28
  • Force LTE network ==> tick Enable, tick Register, interval 300 seconds

Tick Save