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Same I used iperf on a private lte network with the same mtu same antennas and same location

Draytek gives 30Mbps/30Mbps

Teltonika rut955 gives 20Mbps/2Mbps

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I will need you to answer these questions:

  • Do you have QoS enabled or set-up? It could cause you to have limited speeds.
  • Did you try any other SIM cards? Do they perform the same way?
  • Do you have the latest firmware on your device? If no, try updating it.
  • Are both of your antennas tightly screwed in? What is your signal?
  • Have you tried resetting the router to default factory settings? If the issue still persists try doing it.
  • Lastly, with what source you've tested your download/upload speeds? Keep in mind that the speed does not only depend on the modem alone.