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Good day to you Lub,
I have a similar situation to you - we use the SIM340Z module in our modems, and I have found 2 different revisions among our inventory.
Looking closer, they behave similarly, but I notice from time to time, they fail calls differently - the SIM340 being more prone to...
We are in the process of putting our modem design through PTCRB, and are failing on the SIM Vcc test, specifically the 3.0 volt test.
Some quick notes -
- We are using the SIMCOM SIM5320A, which is pre-approved for PTCRB and AT&T networks
- SIMCOM has been contacted but so far, has not been...
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