Use controlled substitution. Test the SIM in another approved device, or a known-working SIM in the router. Move the router to a known-good antenna or connect a short test antenna, and compare signal-quality readings. Verify APN and configuration against a working template.
Check system uptime and power logs to identify resets. If several devices on the same carrier fail together, investigate the network; if only one site has poor RSRQ or SINR, inspect the radio path. Reproduce the fault on the bench where possible. Change one variable at a time and keep evidence, otherwise several simultaneous changes can hide the real cause.
Public Q&A
How can a technician separate a carrier problem, antenna problem, configuration problem and router fault?
Useful next steps
Use this answer as a practical starting point. Current scope, specifications, compatibility, availability, pricing, timing and next steps should be confirmed directly with Comset where they affect a decision.
Related Topics
Continue Through Related Topic Pages
Explore more topic pages connected to this answer.
Related visual examples
A short visual sample connected to this answer or its topic.
