Protocol analysis
R&S
®
RTP
829User Manual 1337.9952.02 ─ 12
3 = Differential data signal D+
4 = Ground pin for power return
5 = SuperSpeed receiver differential pair Rx-
6 = SuperSpeed receiver differential pair Rx+
7 = Ground drain for signal return
8 = SuperSpeed transmitter differential pair Tx-
9 = SuperSpeed transmitter differential pair Tx+
* = Connector images courtesy of Wikipedia authors smial and Unconventional2
Table 13-31: Backward compatibility of USB 3.1 connectors
Connector type USB 3.1 Compatibility USB 2.0
Standard-A
plug ... is backward compatible with ... receptacle
receptacle ... is backward compatible with ... plug
Standard-B
plug ... is not compatible with ... receptacle
receptacle ... is backward compatible with ... plug
Micro-USB
plug ... is not compatible with ... receptacle
receptacle ... is backward compatible with ... plug
To achieve the data throughput of USB 3.1, all involved components (host, cable,
device and optional hub) must comply with USB 3.1 specifications. If any component
only complies, for example, with USB 2.0 Hi-Speed specifications, the setup works, but
limited to Hi-Speed USB data rates.
USB 3.1 also specifies a new connector format, called Type-C, with a reversible plug.
This small and durable connector is, however, not mechanically compatible with
USB 2.0 connectors.
USB 3.1 Type-C connector
Figure 13-31: USB 3.1 Type-C receptacle and reversible plug
A1 to A12 = Twelve USB Type-C pins
B1 to B12 = The same USB Type-C pins as A1 to A 12, but in reverse order
* = Images courtesy of Heise Medien, Acon, phoneArena and Wikipedia author Chindi.ap
USB 3.1 (option R&S RTP-K61/K62)
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