Protocol analysis
R&S
®
RTO6
841User Manual 1801.6687.02 ─ 05
While USB 3.1 Gen 2 is not yet very common, you can use a fast oscilloscope (mini-
mum 5 GHz) with option R&S RT
O6-K570
to analyze signals encoded according to the
USB 3.1 Gen 1 protocol.
Oscilloscope must range up to 5 GHz, at least
As the USB 3.1 Gen 1 protocol is defined for data rates up to 5 GHz, option
R&S R
T
O6-K570 requires a fast oscilloscope that covers this frequency range.
USB 3.1 supersedes the USB 3.0 standard but uses, for example, the USB 3.0 Stan-
dard-A connector design with 9 pins. Hence, USB 3.1 cables and connectors contain 5
additional wires and pins compared to USB 2.0.
Figure 13-45: USB 3.1 cable cross-section and Standard-A plug - backward compatible with USB 2.0
A = Shield (braid) / connector shell
B = USB 2.0 unshielded twisted pair
C = USB 3.0 / USB 3.1 shielded twisted pair
D = USB 3.0 / USB 3.1 shielded twisted pair
1 = Voltage bus V
CC
power supply pin, +5 V
2 = Differential data signal D-
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 13-35: 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
USB 3.1 (option R&S RT
O6-K570)
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