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QualiPHY automates USB4™ (Universal Serial Bus 4) physical layer (PHY) testing in accordance with the USB-IF USB4 and Thunderbolt 3 CTS (Compliance Test Specifications) over the USB Type-C® connector. The Teledyne LeCroy LabMaster SDA 10 Zi-A Oscilloscope, WavePulser 40iX High-speed Interconnect Analyzer, and Anritsu MP1900A Signal Quality Analyzer-R BERT (Bit Error Rate Tester) compose a comprehensive system that provides USB4 test engineers with an integrated electrical test solution.

Explore QPHY-USB4-TX-RX arrow down
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Key Features
  • Supports USB-C® Compliance Test Specifications:
    • USB4 Router Assembly
    • USB4 Captive Device
    • Thunderbolt™ 3 Host/Device
    • USB4 Active Cable (CTS under development)
  • Tests Supported:
    • Transmitter (Tx) tests
    • Receiver (Rx) tests
    • Rx channel calibration using S-Parameters
    • Passive & active cable measurements
  • Automated testing for USB4 hosts, devices, hubs, passive cables, and active cable assemblies
  • Multi-Lane analysis, compliance, and debug of USB4 ports
  • Device Under Test (DUT) control using automated controller and fixtures
  • Insertion loss measurement of USB-C Cables
  • QualiPHY report generation feature creates comprehensive reports with all pertinent test information

QPHY-USB4-TX-RX Simplifies Compliance Testing

QPHY-USB4-TX-RX test software controls the Oscilloscope, BERT, and test controller to perform parametric, jitter, and eye compliance tests on the on the transmitters (Tx); and calibrating the stressed eye and performing BER measurements on the receivers (Rx). it first provides a step-by-step guide of how test system needs to be connected to correctly test the device. It then automatically configures the instrument and DUT settings and features, performs the test, and records the results in a compliance test report.

Multi-Lane Transmitter (Tx) Testing

USB4 Architecture defines two signaling lanes of 20 Gb/s. The LabMaster SDA 10 Zi-A provides acquisition, analysis, and compliance tests on both lanes simultaneously using SDAIII-CompleteLinQ Serial Data Analysis Software, significantly saving time in test setup, compliance, and debug. The WaveMaster SDA 8 Zi-B can be used to test the two lanes ‘lane-by-lane’ sequentially.

Transmitter (Tx) Compliance Measurements

QPHY-USB4-TX-RX uses clear connection diagrams to simplify all setup steps. Simply make the connections and select the measurements to be made. QPHY-USB4-TX-RX automatically performs all Tx compliance measurements.

Receiver (Rx) Test Calibration

Receiver test calibration is fully automated by QPHY-USB4-TX-RX. Here, QPHY controls the Anritsu MP1900A SQA and LabMaster SDA 10 Zi-A oscilloscope to calibrate the receiver stressed eye parameters. The Insertion Loss (IL) of the Total Channel must be calibrated and the cables to the oscilloscope (for both Tx measurements and Rx calibration) must be de-embedded using S-parameter measurements.

USB4 S-Parameter Measurements

As indicated by the connection diagrams in QPHY-USB4-TX-RX, Tx measurements and Rx calibration requires that insertion loss measurements of test cables and fixtures be made. The 4-port S-parameter model of the cables is measured and de-embed by the oscilloscope in all cases. During receiver calibration, the insertion loss of the USB-C cable and total test channel must also be measured. The WavePulser 40iX brings cost effective 40 GHz S-parameters, impedance profile measurements and analysis to the USB4 test bench.

Receiver (Rx) BER Testing

After the calibration is complete, the oscilloscope is replaced in the setup by the DUT (Device Under Test). BER (Bit Error Rate) testing is performed by reading the error registers in the DUTs receiver circuit for a specified observation time while the calibrated stressed eye signal is applied. The microcontroller polls the DUT error count register using SBTX/SBRX sideband signals through the USB-C Cable. QPHY-USB4-TX-RX supports automation of the BER testing and provides a full test report.


QualiPHY is designed to reduce the time, effort and specialized knowledge needed to perform compliance testing on high-speed serial buses.

  • Guides the user through each test setup
  • Performs each measurement in accordance with the relevant test procedure
  • Compares each measured value with the applicable specification limits
  • Fully documents all results – Compliance Reports can be created as HTML, PDF, or XML.
  • QualiPHY helps the user perform testing the right way-every time!

USB4 and Thunderbolt3 Test Fixtures (Ordered from Wilder-Tech)

Go to for details on high speed test fixtures and DUT microcontrollers.

USB4™, USB Type-C®, and USB-C® are trademarks of USB Implementers Forum.
Thunderbolt™ is a trademark of Intel Corporation.


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