性能测试艺术:挑选USB Type-C规范1.1下的工具策略

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"《讲述的内容中关注了挑选性能测试——USB Type-C Specification Release 1.1》一文主要探讨了在IT行业中进行性能测试的重要性和实践方法。首先,作者强调了概念验证(POC)在性能测试项目中的基础地位,它不仅帮助评估工具的技术适应性,还要求在真实应用环境中进行试用,以确保工具的适用性和问题的发现与解决。 章节1详细介绍了进行性能测试的原因,包括以最终用户的角度理解性能度量,设定合理的性能标准,以及性能问题在互联网时代下的普遍性。文章指出,性能问题常源于IT项目中对性能的忽视,如系统设计阶段缺乏性能考虑,测试常常推迟到最后一刻,以及对用户需求和性能测试规范的不充分理解。 第二章深入讲述了如何进行有效性能测试,涵盖了关键步骤如选择适合的性能测试工具。这包括理解测试工具的基本构成,确定自动化测试工具的关键需求,以及考虑替代方案。设计合适的测试环境也至关重要,涉及虚拟技术、负载生成器的能力,以及不同部署模式的考虑。此外,还强调了性能指标的制定、应用程序稳定性、代码冻结、关键业务事务识别、测试数据质量和测试设计的准确性等要素。 具体到USB Type-C Specification Release 1.1,可能是指对于这种接口的性能测试,比如数据传输速度、电流支持、充电效率等方面的测试,以确保设备在实际使用中的高效和兼容性。文章可能还会涉及该规格对于新型设备和连接器的性能要求,以及如何通过性能测试来验证这些特性。 这篇文章不仅关注通用的性能测试策略,而且特别关注USB Type-C这类技术的具体应用场景,为开发者和质量保证团队提供了实用的指导,帮助他们构建高效、稳定且符合规格要求的应用程序。"
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Universal Serial Bus Type-C Cable and Connector Specification Release 1.3 July 14, 2017 CONTENTS Specification Work Group Chairs / Specification Editors ................................................... 11 Specification Work Group Contributors .................................................................................. 11 Pre-Release Draft Industry Reviewing Companies That Provided Feedback ................ 14 Revision History ............................................................................................................................. 14 1 Introduction ............................................................................................................................ 15 1.1 Purpose ......................................................................................................................... 15 1.2 Scope ............................................................................................................................. 15 1.3 Related Documents .................................................................................................... 16 1.4 Conventions ................................................................................................................. 16 1.4.1 Precedence .................................................................................................... 16 1.4.2 Keywords ...................................................................................................... 16 1.4.3 Numbering .................................................................................................... 17 1.5 Terms and Abbreviations ......................................................................................... 17 2 Overview ................................................................................................................................. 21 2.1 Introduction ................................................................................................................ 21 2.2 USB Type-C Receptacles, Plugs and Cables ......................................................... 22 2.3 Configuration Process ............................................................................................... 23 2.3.1 Source-to-Sink Attach/Detach Detection .............................................. 24 2.3.2 Plug Orientation/Cable Twist Detection ............................................... 24 2.3.3 Initial Power (Source-to-Sink) Detection and Establishing the Data (Host-to-Device) Relationship ................................................................. 24 2.3.4 USB Type-C VBUS Current Detection and Usage .................................. 25 2.3.5 USB PD Communication ............................................................................. 25 2.3.6 Functional Extensions ................................................................................ 26 2.4 VBUS ............................................................................................................................... 26 2.5 VCONN ............................................................................................................................. 27 2.6 Hubs ............................................................................................................................... 27 3 Mechanical ............................................................................................................................... 28 3.1 Overview ...................................................................................................................... 28 3.1.1 Compliant Connectors................................................................................ 28 3.1.2 Compliant Cable Assemblies .................................................................... 28 3.1.3 Compliant USB Type-C to Legacy Cable Assemblies .......................... 28 3.1.4 Compliant USB Type-C to Legacy Adapter Assemblies ..................... 29 3.2 USB Type-C Connector Mating Interfaces ............................................................ 29 3.2.1 Interface Definition .................................................................................... 29 3.2.2 Reference Designs ....................................................................................... 52 3.2.3 Pin Assignments and Descriptions ......................................................... 59 3.3 Cable Construction and Wire Assignments ......................................................... 60 3.3.1 Cable Construction (Informative) ........................................................... 60 3.3.2 Wire Assignments ....................................................................................... 62 3.3.3 Wire Gauges and Cable Diameters (Informative) ............................... 63 3.4 Standard USB Type-C Cable Assemblies .............................................................. 65 3.4.1 USB Full-Featured Type-C Cable Assembly .......................................... 65 3.4.2 USB 2.0 Type-C Cable Assembly .............................................................. 66 3.4.3 USB Type-C Captive Cable Assemblies .................................................. 67 3.5 Legacy Cable Assemblies .......................................................................................... 67 3.5.1 USB Type-C to USB 3.1 Standard-A Cable Assembly .......................... 68 3.5.2 USB Type-C to USB 2.0 Standard-A Cable Assembly .......................... 69 3.5.3 USB Type-C to USB 3.1 Standard-B Cable Assembly .......................... 70 3.5.4 USB Type-C to USB 2.0 Standard-B Cable Assembly .......................... 71 3.5.5 USB Type-C to USB 2.0 Mini-B Cable Assembly ................................... 72 3.5.6 USB Type-C to USB 3.1 Micro-B Cable Assembly ................................. 73 3.5.7 USB Type-C to USB 2.0 Micro-B Cable Assembly ................................. 75 3.6 Legacy Adapter Assemblies ..................................................................................... 76 3.6.1 USB Type-C to USB 3.1 Standard-A Receptacle Adapter Assembly 76 3.6.2 USB Type-C to USB 2.0 Micro-B Receptacle Adapter Assembly ...... 78 3.7 Electrical Characteristics ......................................................................................... 79 3.7.1 Raw Cable (Informative) ........................................................................... 79 3.7.2 USB Type-C to Type-C Passive Cable Assemblies (Normative) ....... 80 3.7.3 Mated Connector (Informative) .............................................................. 93 3.7.4 USB Type-C to Legacy Cable Assemblies (Normative) ...................... 97 3.7.5 USB Type-C to USB Legacy Adapter Assemblies (Normative) ....... 101 3.7.6 Shielding Effectiveness Requirements (Normative) ........................ 103 3.7.7 DC Electrical Requirements (Normative) ........................................... 106 3.8 Mechanical and Environmental Requirements (Normative) ........................ 109 3.8.1 Mechanical Requirements ....................................................................... 109 3.8.2 Environmental Requirements ................................................................ 115 3.9 Docking Applications (Informative) ................................................................... 116 3.10 Implementation Notes and Design Guides ........................................................ 117 3.10.1 EMC Management (Informative) ........................................................... 117 3.10.2 Stacked and Side-by-Side Connector Physical Spacing (Informative) .............................................................................................. 120 3.10.3 Cable Mating Considerations (Informative) ...................................... 120 4 Functional .............................................................................................................................. 122 4.1 Signal Summary ........................................................................................................ 122 4.2 Signal Pin Descriptions ........................................................................................... 122 4.2.1 SuperSpeed USB Pins ............................................................................... 122 4.2.2 USB 2.0 Pins ................................................................................................ 123 4.2.3 Auxiliary Signal Pins ................................................................................ 123 4.2.4 Power and Ground Pins ........................................................................... 123 4.2.5 Configuration Pins .................................................................................... 123 4.3 Sideband Use (SBU) ................................................................................................. 123 4.4 Power and Ground ................................................................................................... 123 4.4.1 IR Drop ......................................................................................................... 123 4.4.2 VBUS ............................................................................................................... 124 ... ...