Either
The router selects a band (B20) and does not connect when there is an alternative valid band (B1) available.
Or
The router selects a band (B20 - 20Mb) that is considerably slower connection than an alternative available band (B1 - 75Mb).
I have to manually select the band in network>mobile>connection to either obtain a connection or faster speeds.
LTE Band 20 (800 MHz DD) offers good coverage and penetration, enabling widespread LTE services, especially in areas with dense infrastructure, with throughput ranging from 5 Mbps to 100 Mbps and peaking up to 300 Mbps in optimal conditions.
Your RSSI, RSRP, RSRQ and SINR are very poor.
LTE Band 1 (2100 MHz) offers a theoretical maximum downlink throughput of around 100.8 Mbps, with a bandwidth of 20 MHz and 64 QAM modulation.
I understand this but sometimes the router only tries to connect on B20 showing the Operator as N/A, see screen shot 1, with NO internet connection. I have to manually select band B1 to obtain an internet connect as per screen shot 2. This is not logical, if a connection is N/A then surely the router should try the alternative band and obtain an internet connection.
The ability to select a band automatically based on speed would be desirable.
I use the router in a van with an external antenna and travel extensively in the UK. In some locations I have to obtain an internet connection by choosing a different band manually which is illogical.
In other areas, even though signal strength in excellent on both B20 and B1, I have to manually change the band to B1 to obtain quicker internet speeds.
I have the Teltonika external puck. However, this is irrelevant as I have a signal but am having to manually select a band in order to obtain a connection or increase speed.
For example, where I am at the moment the router tries to connect to B20 but fails and that’s it no connection. I therefore have to select B1 manually to obtain a 15Mb connection.
Yesterday, in a different location with excellent reception, the router connected to B20 to give a 20Mb connection. Manually swapping to B1, also with excellent reception, gave me a 75Mb connection.