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    sim900 not detecting sim card

    It seems that something is making your SIM VCC signal forcefully low. It should give 1.8V or 3V as per sim card support. While detecting SIM hardware first GSM engine gives 1.8V Voltage cycle if it is supported by sim then it will work. If SIM dont support 1.8V then GSM engine try 3V cycle to...
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    SGMII/SerDes interface

    My query is where should be placement of ac coupling capacitor in sgmii interface on PCB??? What should be the value of ac coupling capacitor???

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