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USB4™ USB3 Tunneling
Compliance Test Specification
Date
January 2021
Revision:
1.1
2
Copyright © 2021, USB Implementers Forum, Inc.
All rights reserved
THIS SPECIFICATION IS PROVIDED TO YOU “AS IS” WITH NO WARRANTIES WHATSOEVER,
INCLUDING ANY WARRANTY OF MERCHANTABILITY, NON-INFRINGEMENT, OR FITNESS FOR
ANY PARTICULAR PURPOSE. THE AUTHORS OF THIS SPECIFICATION DISCLAIM ALL LIABILITY,
INCLUDING LIABILITY FOR INFRINGEMENT OF ANY PROPRIETARY RIGHTS, RELATING TO USE
OR IMPLEMENTATION OF INFORMATION IN THIS SPECIFICATION. THE PROVISION OF THIS
SPECIFICATION TO YOU DOES NOT PROVIDE YOU WITH ANY LICENSE, EXPRESS OR IMPLIED,
BY ESTOPPEL OR OTHERWISE, TO ANY INTELLECTUAL PROPERTY RIGHTS.
All product names are trademarks, registered trademarks, or service marks of their respective
owners.
3
Revision History:
Revision
Issue Date
Comments
1.0
June 2020
First Release
1.1
January 2020
With editorial corrections and test fixes
4
Contents
Introduction ........................................................................................................................................................... 5
Terminology .......................................................................................................................................................... 5
Assertions .............................................................................................................................................................. 7
Test Requirements ............................................................................................................................................... 20
Hardware ................................................................................................................................................................. 20
Software .................................................................................................................................................................. 20
Test Setups .......................................................................................................................................................... 21
Host Routers ............................................................................................................................................................ 21
Device Routers ......................................................................................................................................................... 22
Tests .................................................................................................................................................................... 24
USB3 Tunneling .................................................................................................................................................... 24
USB3 Adapter Layer ............................................................................................................................................. 25
USB3 Mode Testing (Hubs and Devices Only) ..................................................................................................... 59
TBT3 Mode Testing (Hubs and Devices Only) ...................................................................................................... 60
5
Introduction
The tests defined in this test specification verify that a Router is compliant with Chapter 9 of the USB4™
Specification.
Note: This specification only covers USB3 Tunneling testing, it does not cover testing for native USB 3.2 support.
Note: If a USB4 Device, Hub or Dock includes an internal host controller, it also needs to pass xHCI CV testing
over the PCIe tunnel using a TBT3 host.
Terminology
The following table describes the terms used in this document.
Analyzer
Test tool that captures and parses packets, transactions, ordered sets, etc.
Compliance
Device
A KG USB4 Device that is capable of performing Transport Layer Packet loopback.
The KG USB4 Device is configured by USB4 CV (when USB4 CV is upstream of the UUT) or
the Exerciser (when the exerciser is upstream of the UUT). Unless specified otherwise, the
Compliance Device is configured as an ordinary KG USB4 Device. See the USB4 Connection
Manager Guide for more information on how a USB4 Device is configured.
The KG USB4 Device supports USB3 Tunneling at both USB 3.2 Gen 2x1 and USB 3.2 Gen
2x2 speeds.
DFP
Downstream Facing Port.
Exerciser
The compliance test tool (hardware and software) that implements USB4 Port functionality and
the behavior required for compliance testing.
IOP
Interop Testing. See USB4™ Interop Test Specification.
KG USB4
Device
“Known Good” USB4 Device. A USB4 Device that is known to be compliant with the USB4
Specification.
KG USB4
Host
“Known Good” USB4 Host. A USB4 Host that is known to be compliant with the USB4
Specification.
KG TBT3
Device
A Certified Thunderbolt™ 3 Device.
KG TBT3
Host
A Certified Thunderbolt™ 3 Host.
PUT
Port Under Test. The USB4 Port on a UUT that is the test point for compliance testing.
RUT
Router Under Test. The Router that is being tested for compliance.
UFP
Upstream Facing Port.
USB4 CV
Test tool that implements a Connection Manager with additional functionality to implement
compliance tests.
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