E5080B Method of Implementation (MOI) for USB Type-C to Type-C Cable Assembly Compliance Test

Revision

Comments

Date

1.0

First draft for E5080B series

30-Nov-2020

1.1

-  Added Channel Metrics test for Mated Connector

-  Updated new release of USB-IF compliance tool 

12-Jan-2021

Description 

Test Equipment 

Network Analyzer 

Keysight Network Analyzer: 

(20 GHz is recommended as USB4/Type-C cable/connector requires measurements up to 20 GHz)

•  E5080B-4K0: 4-port test set, 9 kHz to 20 GHz or

•  P5024/25A Streamline USB Series VNA or

•  M9804/05A PXI Multiport VNA

Note: Ensure that E5080B firmware revision is at least version A.14.10 or above (Windows 10)

Software

S9x011A/B Enhanced time-domain analysis with TDR * Selection is based on the VNA platforms. x=6 for ENA, x=7 for Streamline USB, x=5 for PXI 

Compliance Tool

Compliance Tool provided by USB-IF: https://compliance.usb.org/files/Ger_iPar_v0p91a_relea se.zip (Released 7-Dec-2020)

https://compliance.usb.org/files/IntePar_1p6.zip

(Released 3-Jan-2021)

ECal or

Mechanical

Cal Kit 

N4433D-010/0DC 4-Ports Electronic Calibration (ECal)

Module or 85052D Economy Mechanical Calibration Kit

Test Fixture 

USB Type-C official test fixture and calibration standards, or an equivalent set of fixtures and standards.

Note: Fixtures for testing USB Type-C connectors and cable assemblies are available for purchase through LUXSHARE-ICT.

Adapter 

(for E5080B only)

Coaxial straight Female-SMA Female-SMA 50-Ohm adapters (Keysight 1250-1666).

RF Cable

3.5 mm or SMA cables of 4 GHz bandwidth or more

(EG: 5062-6691)

* Y1740A-100 (3.5-mm m-m, 36 inch) cable is recommended for Streamline USB and PXI VNA.

Terminator

50-ohm terminations to terminate unused channels.

Steps

Procedure

Step 1

The VNA should be powered on and allowed to warm up - recommendation is for 24 hours prior to measurement.

•        Recommended to set the frequency sweep range 20 GHz for the USB Type-C SuperSpeed pairs as required by the spec.

•        The IF Bandwidth should be low enough to help reduce noise effects (e.g. < 300 Hz).

Step 2

Set measurement conditions by recalling a state file or manual setup. 

There are 3 type of USB Type-C Cable-Connector tests state files and MOIs. Choose the right one base on your DUT type.

1.     Type-C to Type-C Passive Cable Assemblies (for High Speed Signal and Low Speed Signals)

2.     Type-C to Legacy USB Cable Assemblies

3.     Type-C to Legacy USB Adapter Assemblies

Step 3

Connect USB Type-C Test fixture to test ports of the VNA.

Step 4

For Time Domain Measurements, perform Electronic Calibration (ECal) and de-embedding.

Step 5

For Frequency Domain Measurements, perform Electronic Calibration (ECal) and deembedding.

Step 6

Perform Time Domain Measurements

-  D+/D- Differential Impedance (Normative)

-  D+/D- Intra-Pair Skew (Normative)

-  D+/D- Propagation Delay (Normative)

-  [Raw Cable] Differential Impedance (Informative)

-  [Raw Cable] Intra-Pair Skew (Informative)

-  [Mated Connector] Differential Impedance (Normative for USB4 Gen3, Informative for USB 3.2 Gen2, USB4 Gen2)

-  [Low Speed Signal] Characteristic Impedance (Informative)

Step 7

Perform Frequency Domain Measurements

-  D+/D- Pair Attenuation (Normative)

-  Channel Metrics (ILfitatNq, IMR, IXT, IRL) (Normative)

-  Channel Operating Margin, COM (Normative – USB4 Gen3)

-  Differential-to-Common Mode conversion) (Normative)

-  Cable Shielding Effectiveness (Normative)

-  [Raw Cable] Differential Insertion Loss (Informative)

-  [Mated Connector] - Channel Metrics (ILfitatNq, IMR, IXT, IRL) (Normative for USB4 Gen3)

-  [Mated Connector] Differential Insertion Loss (Informative)

-  [Mated Connector] Differential Return Loss (Informative)

-  [Mated Connector] Differential NEXT & FEXT between SS Signal Pairs (Informative)

-  [Mated Connector] Differential NEXT & FEXT between D+/D- Pair and SS Signal Pairs

(Normative for USB4 Gen3, Informative for USB 3.2 Gen2, USB4 Gen2)

-  [Mated Connector] Differential to Common Mode Conversion (Normative for USB4 Gen3, Informative for USB 3.2 Gen2, USB4 Gen2)

-  Differential Insertion Loss (Informative)

-  Differential Return Loss (Informative)

-  Differential NEXT & FEXT between SS Signal Pairs (Informative)

-  Differential NEXT & FEXT between D+/D- Pair and SS Signal Pairs (Informative)

-  [Low Speed Signal] Crosstalk, VBUS Loop L/C, Coupling Factor

-  [Low Speed Signal] Coupling between CC and Differential D+/D-

-  [Low Speed Single-ended Coupling between CC and D+/D-

-  [Low Speed Signal] Coupling between VBUS and Differential D+/D- - [Low Speed Signal] Single-ended Coupling between SBU_A and SBU_B

-  [Low Speed Signal] Single-ended Coupling between SBU_A/SBU_B and CC

-  [Low Speed Signal] Coupling between SBU_A/SBU_B and Differential D+/D-