SIM failure issue

11 thoughts on “SIM failure issue

  1. Dear Sir,

     

    We are using GL868-DUAL (10.00.186) module in home security products. Earlie, it was working fine, we had deployed thousand of device in filed that is working fine. but last few month we are facing "SIM not inserted" issue fields.

     

    i have feel, It is happening due to EMI/EMC. We have revised module and SMPS PCB to reduce EMI/EMC, But issue still not resolved.

     

    Please let me know, How to figure out this issue.

     

     

     

    Regards,
    Diwakar

    1. Hi Diwakar,

      usually  in case of SIM removed or a fail in comunication with it from module the message is "SIM FAILURE".

      SIM NOT INSERTED means module is not able to detect the SIMIN pin.

      Maybe it can be of some help if you contact us at support team, so you can send your design ( schematic and gerber) and we can go over them and report a design review.

       

      To overcome this status you can use the sequence:

      1) AT#SIMDET=0

      2) WAIT 1 Sec

      3) AT#SIMDET=1

       

      This should restart your SIM

      1. Dear Sir,

         

        Thanks for your valuable feedback.

        We already checked AT#SIMDET =0 and AT#SIMDET=1, it is workes fine, but during voice call and SMS we don’t have enought time to do that. 

         

        We have configured AT#QSS=2 to get unsolicited indication. After power on the system ,we are receiving #QSS: 0 unsolicited indication from module.

         

        We already varified schematic and layout from Telit as well. 

         

        I have attached design schematic.

         

        Please let me know, How to figure out this issue.

         

        Thanks & Regards,
        Diwakar

         

        1. Hi Diwakar,

           

          sorry but I’m not understandig what are you writing me.

           

          1) Do you mean at power ON module can’t see the SIM (#QSS: 0)?

           

          2) After SIMDET = 0 SIMDET = 1 modulerecognize the SIM, but after a while it loose it again? during a voice call?

           

          3)  And, most important, have you asked for a design review inhte past you told me.. but I can’t find it on our server. Can you give me the reference ID of your previous request please?

           

  2. Dear Sir,

     

    After power ON, we are able to detect SIM and make voice call and SMS as well, but after a while module lose SIM detection randomly (status LED blinking fast and SIMVCC kept low) However we are not making any voice call and SMS that time.

     

    Resign review reference ID :- ID #225612.  (Support Center)

    date   : 2014-07-28

     

    Thanks

    Diwakar

    1. Dear Sir,

       

      Please help us to getback.

       

      ———————————————————————————————————————

      We are using built in DTMF decoder, for that we enable DTMF decoder (AT#DTMF=1)  and run module at 52MHz (AT#CPUMODE=1), anly ofter that "SIM not inserted" issue are comming.

       

      but, when we disable DTMF decoder, run module at 26MHz, its is working fine. 

       

      our main requirement to use built in DTMF decoder.

       

       

       

      Please advise.

       

       

      Thanks & Regards,
      Diwakar

          1. Dear Luca,

             

            R15 and R14 already open.

             

            Normal
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            false
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            EN-US
            X-NONE
            X-NONE

            MicrosoftInternetExplorer4

            Observation

            till now

            ####################################################################

            Normal
            0

            false
            false
            false

            EN-US
            X-NONE
            X-NONE

            MicrosoftInternetExplorer4

            Last 15 days, we kept six devices in
            working conduction for testing purpose (AT#CPUMODE=0), we never get any
            single issue this period.

             

             But when we
            running module 52MHz (AT#CPUMODE=1), then only module losing SIM detection after a
            short while. (SIM detection lost happening in many devices)

             

             ####################################################################

             

            Please advise.

             

             

            Best Regards,
            Diwakar

             

             

             

             

          2. Hi Diwakar,

             

            do you have a way to taka a snapshot of SIM lines ( at least SIMVCC and SIMCLK  ) when switching to CPUMODE 1?

            Of course I can do it also and in fact I did it, but here it goes on working fine so i can’t understand what is happening.