USB 3.0 cables have eight primary conductors: Three twisted signal pairs for USB data paths and a power pair. (See in figure) the basic signal arrangement for the USB 3.0 cable. In addition to the twisted signal pair for USB 2.0 data path, two twisted signal pairs are used to provied the SuperSpeed data path ,one for the transmit path and one for the receive path.
USB 3.0 receptacles (both upstream and downstream) are backward compatible with USB 2.0 connector plugs. USB 3.0 cables and plugs are not intended to be compatible with USB 2.0 upstream receptacles. As an aid to users , USB3.0 mandates standard coloring for plastic portions of USB 3.0 plugs and receptacles.
Electrical (insertion loss, return loss, crosstalk, etc.) performance for USB 3.0 is defined with regard to raw cables, mated connectors, and mated cable assemblies ,with compliance requirements using industry test specification established for the latter two categories. Similarly, mechanical (insertion/extraction forces, durability , etc.) and environmental (temperature life, mixed flowing gas, etc.) requirements are defined and compliance established via recognized industry test specification.
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