Problem of registering to voice and GPRS

13 thoughts on “Problem of registering to voice and GPRS

  1. We are manufacturers of PLCs, HMIs, Remote I/Os and RTUs in India.

    We are planning to develop a solution for Remote monitoring and control via GSM GPRS network. We intend to develop GSM GPRS module with IOs using telit GPRS core. We see huge opportunities in the field of water treatment and distribution in India.

    Looking at Telit company profile and product range, we have selected Telit for our ambitious product development plan.Cool

     

    We have 2 GPRS modems GC864-Dual and 1 GPRS modem GT863-PY from Arrow Electronics India Pvt. Ltd., Bangalore, India. We are facing following problems.

     

    Modem1 Problem:

    Modem doesnot register with voice and GPRS with factory default profile.

    – Responds  +CREG:0,3  to command +CREG

    – Responds +CGREG:0,3 to command +CGREG

    – Responds +COPS:0,0,AIRTEL to command +COPS even though service provider is IDEA (not AIRTEL)

       

    Modem2 Problem:  

    Modem registers with voice but not with GPRS with factory default profile with service provider IDEA.

    – Responds  +CREG:0,1  to command +CREG

    – Responds +CGREG:0,2 to command +CGREG

    But same modem registers with voice and GPRS with another service provider AIRTEL.

     

    GPRS modem GT863-PY has no issues and is registering with voice and GPRS with both service providers and absolutely working fine. Hence, we have completed  our development with GPRS modem GT863-PY. 

     

    What could be the problem with GPRS modems GC864-Dual.  This problem is not resolved for last 2 months from your local representative despite of frequent follow up. We are worried about support from your local representative. We plan to standardize on GC864-Dual.We are really stuck up. Please help. Cry

     

     

    1. Hi,

       

      Modem 1: what if you perform manual operator selection to IDEA?

      Modem 2: are you sure IDEA SIM has GPRS enabled?

       

      Please repeat tests with AT#REGMODE=1, and report firmware version. Also a listing of AT#CSURV command result would help I think. 

       

      1.  

        Modem1
        Command used for configuration is +COPS=1,0,IDEA
        Response is OK
        Response to CREG and CGREG command is CREG:0,3 and +CGREG:0,3 respectively
        Modem2
        The card is GPRS enabled becaude this same SIM card works fine with GT863-PY/ SIEMENS/ WAVECOMM cores.
        For command #regMode=1, response is OK.
        After that response to command +CREG and +CGREg is +CREG:0,0 and CGREG:0,0

         

        Firmware version is Dob V2.0.
        Response to AT#CSURV is big one and I am not able to attach respective Hypernet file here
        1. CGREG:0,0 is on both modems after #REGMODE=1 ?

          Please post result of AT+CPIN? too.

          Get firmware version with AT+CGMR?

           

          Save the AT#CSURV in a text file or pdf, which you can attach here.

  2. Modem1
    When Regmode=1, Response to +CGREG and CREG is +CGREG:0,0 and +Creg:0,0
    When Regmode=0, Response to +CGREG and CREG is +CGREG:0,2 and +Creg:0,2
    Response to +CPIN is ERROR
    Response to AT+CGMR is 10.00.072.-B051
    Modem2
    When Regmode=1, Response to +CGREG and CREG is +CGREG:0,1 and +Creg:0,2
    When Regmode=0, Response to +CGREG and CREG is +CGREG:0,1 and +Creg:0,2
    Response to +CPIN is +CPIN:Ready
    Response to AT+CGMR is 10.00.072.-B051
    txt file is attached herewith
  3. I sent you the link to get 10.00.073 firmware, please upgrade the modules and repeat the tests, plus:

    – set AT+CMEE=2

    –  check why +CPIN is ERROR (what error) is on modem 1

    – please save the terminal log file in a correct way, the file you attached is pretty much mangled. Attach again.

    – check your antennas, from what I can understand in the above file the signal is very weak for suitable cells

     

    1. GC864-DUAL-V2.zip contains readme.txt , streamGC864_DUAL_V2_10_00_073.bin.

      readme .txt says XFP tool is required to upgrade frimware.

      How can I get this tool, please.

       

  4. We downloaded new firmware to modem 
    There is no improvement in observations.
    Please find t survey files attached in pdf format after new firmware is downloaded.
     -863PY Survey.pdf is the survey of modem in which both SIM cards are working fine.
     – 864Faulty Survey.pdf is the survey of modem1 in which both SIM cards (IDEA and AIRTEL) donot register to voice and GPRS
     – 864 Survey.pdf is the survey of modem2 in which IDEA SIM card registers with voice but not with GPRS. But it registers with AIRTEL SIM card.
    Also note that with modem2, command  #CSURV returns ERROR if SIM card is inside modem. This command gets response only if there is no SIM card inserted in modem.
    Modem1 sends response CME ERROR 10 to command +CPIN.
    1. We downloaded new firmware to modem 
      There is no improvement in observations.
      Please find t survey files attached in pdf format after new firmware is downloaded.
       -863PY Survey.pdf is the survey of modem in which both SIM cards are working fine.
       what is the sw. version of the GT863PY ?
       – 864Faulty Survey.pdf is the survey of modem1 in which both SIM cards (IDEA and AIRTEL) donot register to voice and GPRS
      Signal is good, module registered in emergency mode. Is the SIM card detected?
       – 864 Survey.pdf is the survey of modem2 in which IDEA SIM card registers with voice but not with GPRS. But it registers with AIRTEL SIM card.
      Also note that with modem2, command  #CSURV returns ERROR if SIM card is inside modem. This command gets response only if there is no SIM card inserted in modem.
      Modem1 sends response CME ERROR 10 to command +CPIN.

      Signal received is quite low. For the same ARFCN 543 I can see -100dBm on the 864 and -76dBm for 863 and the second 864Faulty. It seems a problem on the antenna path (cable, connector, antenna…).
      ERROR 10 means that SIM is not inserted or the module cannot detect it. Do you use a GC864 with SIM holder or your own SIM holder mounted on a PCB. Which of the 2 modems shows this error?
      The first one you indicated as 864Faulty or the second 864_Survey ?
  5. Additionally, I have observed that in Telit Modems, error reporting related to socket and GPRS network may not be sufficient as pdf attached herewith. This helps in pin pointing exact problem. Can we get more details if available with you for error reporting.

     

    Administrator note: please do not attach files files without relevance.

     

    Can I get more information in case of socket error and GPRS network error please that will help in fault finding and diagnosis and make life easy.

  6. Modem GT863PY responds 07.02.804  to command AT+CGMR.
    Modem 1 shows CME Error 10 and this one is modem on which no SIM card gets registered (864Faulty). There is another SIM card holder that has been mounted on the PCB.
    It seems that two modems (GC864-DUAL) on which we are facing problems are locally made using Telit core.
    Modem GT863PY is manufactured by Telit and is working absolutely fine. We have completed development in our PLC and able to send and receive SMS, send e-mail as well as data communication with central server on Modbus TCP over GPRS network. We plan to validate interface on actual sites of water distribution. We need at least 3/4 modems now for field validation and observe the performance.
    It is evident that problem is with locally made modems and I have sent those modems back to your local representative Arrow Electronics India Pvt. Ltd., Banglore for repairs. Hope they will do the needful in consultation with you and we receive both modems in working condition. I will update the status to you within few days.
    Thank you very much for your attention and prompt support and expect the same from your local representative.