Changes

**Maintain symmetry 90R +/- 15% differential impedance in the layout traces.**Equal length and symmetric with regards of shape, length, and isolate via count. **Isolate differential pairs from nearby signals and circuitry to mantain maintain the signal integrity.* VBUS overcurrent protection: USB power source current must not be pass 500mA, you should apply a protection into the baseboard. [{{#lst:Template:Links|IGEP_AQUILA_EXPANSION_ISEE_Schematic}} IGEP AQUILA EXPANSION Public Schematic Schematics] proposes a solution using TPS2051D IC.* IGEP COM AQUILA includes into each USB peripheral a VBUS overvoltage protector.