Refer to component floorplan for the location of the jumpers.
The function of the J11 jumper is to select the voltage. When working at Vcc 2.7V-3.3V, the user can keep USB functional by selecting power supply for USB coming from VBUS rather than from Vcc. See below for available options:
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J19 open - UVCC not connected, USB bridge not usable
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J19 pin 1 & 2 connected - UVCC connected to Vcc coming from Power board (default configuration)
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J19 pin 2 & 3 connected - UVCC connected to Vbus coming from USB line (See picture below)
