Author Topic: Proper shutdown  (Read 83 times)

carl_612

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Proper shutdown
« on: April 03, 2017, 03:18:26 PM »
Our product wakes up, transmits data and shuts down the modem as fast as possible to save power.  We have been doing a proper shutdown with pulling ON/OFF pin low for a time and waiting for PWRMON to indicate it is powered down.  Since we fully power down the modem and never receive a call or data connection, we don't care if the network knows if we are still around or not.  Is there any potential negative to just pulling the power to the modem?  Anything negative on the modem itself (e.g. filesystem corruption) or with the network?  We also use the HSPA910CF and EVDO910CF.  Thanks.

carl_612

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Re: Proper shutdown
« Reply #1 on: April 17, 2017, 03:08:08 PM »
If anyone else is curious, the feedback I've received through other channels is that cutting power to the module presents a risk of corrupting the firmware and does not properly disconnect from the network. 

There are options for faster shutdown that do not present the firmware corruption risk (AT#FASTSHDN, or in hardware with the Telit 'HW_SHUTDOWN' or Janus 'RESET' line), but these also do not properly detach from the network.  The cell network assumes the device is still attached and continues to allocate resources, which probably violates some terms of service in the cellular contract.  Therefore they say these two fast shutdown options are only to be used as emergency exit procedures.