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JP4: It is used for selecting the power feeding for the hardware echo cancellation module, by
default we choose the 3.3v for the card, customer do not need to reset the jumper; the card can
also choose 5.0v for power feeding in the case that the 3.3v in the motherboard of PC is not
enough for the card, but this phenomenon happens rarely.
For Selecting 3.3v Power
For Selecting 5.0v Power