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How to remove the buzzing or humming noise during the call?

  Usually if the grounding environment is not properly installed,it will bring more noise or AC interference(50/60 Hz noise or line frequency hum)with the device.Thus,it is recommended to check if the grounding wire is connected properly.You can perform the following procedures:

  -Avoided sharing of AC power outlet with other devices(as this may generate electrical interference).

  -Check if the rack is earth grounded properly.

  -Isolate the equipment from the rack.

  -Cut off the ground pin on the power plug.

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