FAQ

• Q

  How to choose the firmware for the corresponding product and perform firmware updates in the product backend

  You can first log in to the homepage of the backend to view and judge based on "System Info" - "Sub Name".

  If it is  "PMNE". Then select the corresponding firmware versions of  "PMNE",  such as "SC7981PMNE-XXX", etc;

  If it is  "PMN". Select the corresponding firmware version of  "PMN", such as  "SC7981PMN-XXX".

  

  After downloading the firmware, unpack the firmware package (extract the .bin file). Then, in the product backend, go to Advance -> SYSTEM -> Upgrade firmware, import the firmware file, and click 'Update'.

  

  
  

  
  

• Q

  How do I tell what firmware the modem itself has?

  Under 5g lte go to at and then run the command: “ati” don’t include the quote marks. This is what I get back: Quectel RM520N-GL Revision: RM520NGLAAR03A04M4G revision is your firmware.

  

  
  

• Q

  How to Determine the Device's Signal Status?

  Log into the product backend, and on the homepage, you can see three values: 'RSRP', 'RSRQ', and 'SINR'.
  (1) RSRP (Reference Signal Received Power): Indicates the power of the downlink reference signal received by the device, reflecting signal strength.

  • Excellent: -85dBm to -50dBm (strong signal, good coverage).

  • Fair: -95dBm to -105dBm (weak signal, may affect speed).

  • Poor/Very Poor: Below -105dBm (may cause disconnection).

  • Purpose: Used to determine base station coverage range, select the optimal base station for handover, or optimize antenna placement.

  (2) RSRQ (Reference Signal Received Quality): Reflects signal quality by comparing the ratio of useful signal power to total interference and noise power (similar to signal-to-noise ratio).

  • Typical Range:

  • Excellent: -10dB to -3dB (low interference, stable transmission).

  • Fair: -15dB to -10dB (some interference, speed may decrease).

  • Poor: Below -15dB (high interference, prone to packet loss or disconnection).

  • Purpose: Evaluates network anti-interference capability and helps optimize network parameters or switch frequency bands.

  (3) SINR (Signal to Interference plus Noise Ratio): This parameter evaluates the stability of the current wireless signal in complex electromagnetic environments.

  • SINR > 20 dB: Signal is excellent, supporting high-bandwidth applications (e.g., 4K video).

  • SINR < 0 dB: Signal is severely interfered with, which may cause disconnection or high latency.

  • Potential Interference Sources: Can come from other routers, Bluetooth devices, microwave ovens, and other electromagnetic sources.