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How long should nRF9160 stay in CEREG mode 4 on startup?

Jonathan

When I start my nRF9160 modem (AT+CFUN=1) it can sit in CEREG mode 4 (unknown) for a couple of minutes, before it switches to 2 (searching) then 1 (registered).

Is that normal? Is there any way to speed it up?

It is running modem firmware 1.0.1.

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    This is normal, the modem has to listen first to sync itself to the LTE network before beginning the attachment process. The whole process will take a while in poor signal conditions or it can be very rapid. The device will attempt to connect as quickly as possible but it always has enviromental factors that increase attachment time.

    The important thing is that the connection occurs. From my examinations, I have seen the connection take anywhere from less than a minute to over 10 minutes in poor signal areas.

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    This is normal, the modem has to listen first to sync itself to the LTE network before beginning the attachment process. The whole process will take a while in poor signal conditions or it can be very rapid. The device will attempt to connect as quickly as possible but it always has enviromental factors that increase attachment time.

    The important thing is that the connection occurs. From my examinations, I have seen the connection take anywhere from less than a minute to over 10 minutes in poor signal areas.

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