USB 3.0
Overview
The USB 3.0 specification is similar to USB 2.0, but with many improvements and an alternative implementation. Earlier USB concepts such as endpoints and the four transfer types (bulk, control, isochronous and interrupt) are preserved but the protocol and electrical interface are different. The specification defines a physically separate channel to carry USB 3.0 traffic. The changes in this specification make improvements in the following areas:
Architecture and features
!Front view of a Standard‑A USB 3.0 plug, showing its front row of four pins for power and USB 1.x/2.0, and a second row of five pins for the later USB 3.0 connectivity. The insulator is in the USB 3.0 standard blue color, Pantone 300 C.
Architecture and features
In USB 3.0, dual-bus architecture is used to allow both USB 2.0 (Full Speed, Low Speed, or High Speed) and USB 3.0 (SuperSpeed) operations to take place simultaneously, thus providing backward compatibility. The structural topology is the same, consisting of a tiered star topology with a root hub at level 0 and hubs at lower levels to provide bus connectivity to devices.
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