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El cable USB consiste en cuatro conductores, dos conductores de potencia y dos de señal.
El Cable de Alta y Full velocidad consiste de un par trenzado de señal, VBUS, GND, y un campo
común. High-/full-speed cable must be marked to indicate suitability for USB usage (see Section
6.6.2). High-/full-speed cable may be used with either low-speed, full-speed, or high-speed devices.
When high-/full-speed cable is used with low-speed devices, the cable must meet all low-speed
requirements.
Low-speed recommends, but does not require the use of a cable with twisted signaling conductors.
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