Test & Measurement

A guide to USB 3.1 compliance testing

8 April 2015 Test & Measurement Editor's Choice

Keysight Technologies has published a Method of Implementation (MOI) guide for USB 3.1 and USB Type-C connectors and cable assemblies compliance testing using the ENA series network analyser’s enhanced time domain analysis option (E5071C-TDR). When used along with a test package such as Keysight’s state file and calibration kit definition, this measurement guide of procedures for time and frequency domain simplifies compliance testing and setup.

Driven by the demand for more bandwidth, the Universal Serial Bus (USB) continues to evolve to higher data rates. The 10 Gbps USB 3.1 delivers more than double the practical data rate compared to the current 5 Gbps USB 3.0. On the other hand, the new Type-C connector size is much smaller than the current Standard-A connector and is about the size of the USB 2.0 micro-B connector commonly used today.

The Type-C is a 24-pin connector with symmetric form factor, which allows users to plug the cable in either way. In addition, it provides extra pins for power up to 100 W, and display standards are looking at this as well. DisplayPort and HDMI have specs that allow them to run over the current USB cable assemblies and the same will be true with the Type-C cable assembly.

The increase in data rate and the new small connector result in even tougher requirements for the physical layer to ensure interoperability. The E5071C ENA Option TDR can achieve a complete characterisation of time and frequency domain tests for USB 3.1 and USB Type-C connectors and cables assemblies.


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