HDBaseT技术规范2.0详解

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"HDBaseT Specification V2.0.pdf 是一份官方的技术规范手册，主要针对HDBaseT 2.0技术，适用于从事HDBaseT开发的工程师或对此技术感兴趣的爱好者。这份文档由IEEE Communications Society的标准发展委员会赞助，并经过IEEE-SA Standards Board批准，但请注意，这是一份未最终批准的草案，可能会有变动，使用时需自行承担风险。" HDBaseT是一种先进的多媒体传输技术，旨在通过单根电缆连接各种家庭和商业娱乐设备，如电视、投影仪、电脑、音频系统等。HDBaseT 2.0是该技术的一个重要版本，它在前一代的基础上进行了升级和优化，以提供更高效、更强大的性能。在HDBaseT 2.0规范中，关键知识点包括： 1. **多通道数据传输**：HDBaseT 2.0支持同时传输高清视频、音频、以太网、USB、控制信号和电源（Power over HDBaseT，PoH）等多种信号，通过一根电缆实现家庭娱乐系统的集成。 2. **高带宽支持**：HDBaseT 2.0提升了传输速率，可能支持高达10.2 Gbps的数据传输速度，足以处理4K Ultra HD视频流，包括HDR（高动态范围）内容，提供更丰富的视觉体验。 3. **长距离传输**：与HDBaseT 1.0相比，2.0版本可能增强了信号的长距离传输能力，能够在长达100米的CAT5e/6类线缆上无损传输高清视频和音频信号。 4. **兼容性与互操作性**：HDBaseT 2.0设计时考虑了与现有HDBaseT设备的兼容性，确保新旧设备之间的无缝连接。同时，它还可能支持多种标准接口，如HDMI、Ethernet、USB等，提高与其他系统的互操作性。 5. **Power over HDBaseT (PoH)**：2.0版本可能增强了PoH功能，允许通过电缆为远程设备供电，减少了对额外电源插座的需求，简化安装过程。 6. **网络功能增强**：HDBaseT 2.0可能支持全双工以太网通信，提供更快的网络连接速度，适应不断增长的智能家居和物联网设备的需求。 7. **控制协议**：HDBaseT 2.0规范可能包含对多种控制协议的支持，如CEC（Consumer Electronics Control）、IP控制等，使设备间的控制更加便捷。 8. **安全性**：由于涉及到多媒体内容的传输，HDBaseT 2.0可能会有相应的加密和安全机制，以保护内容不被非法获取或篡改。 HDBaseT 2.0规范是多媒体传输领域的一个重要里程碑，它提供了一种高效、全面的解决方案，使得家庭和商业环境中的多媒体设备连接变得更加简单和强大。对于工程师来说，深入理解这份规格书将有助于开发出符合标准、高性能的HDBaseT产品。

HDBaseT

Specification 2.0

Term Definition

AV Audio and Video

BLW Baseline Wander

Cat5e/6/6a Category 5e, Category 6 or Category 6a LAN cables

CEC

Consumer Electronics Control - provides high-level

control functions between all of the various

audiovisual products in a user’s environment

CISPR

Set of standards that are oriented primarily toward

electromagnetic emissions and electromagnetic

emissions measurements

Control period

Part of the HDMI link when no video, audio, or

auxiliary data needs to be transmitted

Data island

Part of the HDMI link when audio and auxiliary data

are transmitted using a series of packets

DDC

Display Data Channel - used for configuration and

status exchange between a single Source and a single

SinkDisplay Data channel

DS Downstream - in the direction of the high throughput

(for example, primary audio and video data flow,

towards the Sink)

DVI A video interface standard

FEXT Far End Cross Talk

Guard band

A finite space used as a separator between video

tracks

HDCP

High-bandwidth Digital Content Protection - a form of

digital copy protection

HDMI

High-Definition Multimedia Interface - a compact

audio/video interface for transmitting uncompressed

digital data

HDSBI HDBaseT Stand By mode Interface

HLIC HDBaseT Link Internal Controls

HPD

Hot Plug Detection -Used by the sink to indicate its

presence to the source

HSYNC

Horizontal Synchronization - a signal given to the

monitor telling it to stop drawing the current

horizontal line and start drawing the next line

C a multi-master serial computer bus

ISI Inter Symbol Interference

Link layer Layer 2 of the seven-layer OSI model

LPPF Low Power Partial Functionality

LSB Least significant bit

MII

Media Independent Interface - a standard interface

used to connect a Fast Ethernet (i.e. 100Mb/s) MAC-

block to a Phy

Authorized licensed use limited to: University of Florida. Downloaded on July 03,2016 at 00:15:35 UTC from IEEE Xplore. Restrictions apply.

HDBaseT

Specification 2.0

Contents

Revision History .................................................................................................................... ii

Conformance Levels ............................................................................................................ vii

References ..........................................................................................................................viii

Contents .............................................................................................................................. ix

List of Figures ..................................................................................................................... xvii

List of Tables ..................................................................................................................... xxiv

1 Introduction .................................................................................................................. 29

1.1 HDBaseT Specification Organization ................................................................................ 29

1.2 HDBaseT Objectives ........................................................................................................ 30

1.2.1 HDBaseT Network Objectives......................................................................................... 30

1.2.2 HDBaseT Link Objectives ................................................................................................ 30

1.3 Terminology, Definitions and Conventions ...................................................................... 31

1.3.1 Terminology & Definitions ............................................................................................. 3 1

1.4 HDBaseT Overview ......................................................................................................... 40

1.4.1 The HDBaseT Link ........................................................................................................ ... 40

1.4.2 HDBaseT Layered Architecture ...................................................................................... 43

2 Link Layer ...................................................................................................................... 46

2.1 General .......................................................................................................................... 46

2.1.1 T-Network Services......................................................................................................... 46

2.1.2 Variable Bit Rate / Error Resistance Level Link Tokens .................................................. 50

2.2 Downstream Link ........................................................................................................... 51

2.2.1 Local Retransmission .................................................................................................... .. 51

2.2.2 Dynamic Payload Error Resistance Level ........................................................................ 53

2.2.3 Downstream Packet Format ........................................................................................... 56

2.2.4 Clock Measurement Service Packet ............................................................................... 66

2.3 Upstream Link ................................................................................................................ 68

2.3.1 Upstream Frame Format ................................................................................................ 68

2.3.2 Upstream Ethernet Data ................................................................................................ 6 9

2.3.3 Upstream Data Sub-Packets ........................................................................................... 69

2.3.4 Upstream CRC-8 Token .................................................................................................. 7 3

2.3.5 Upstream Idle Token ...................................................................................................... 73

2.3.6 Upstream Retransmission Request Sub-Packet ............................................................. 73

Authorized licensed use limited to: University of Florida. Downloaded on July 03,2016 at 00:15:35 UTC from IEEE Xplore. Restrictions apply.

HDBaseT

Specification 2.0

2.4 HDSBI Link Layer ............................................................................................................. 74

2.4.1 HDBaseT Stand by Interface (HDSBI) Overview ............................................................. 74

2.4.2 HDSBI Link Start-Up ..................................................................................................... ... 74

2.4.3 HDSBI Packet Format...................................................................................................... 74

2.4.4 Short Packets ........................................................................................................... ....... 76

2.5 Operation Modes ........................................................................................................... 77

2.5.1 Changing Operation Modes ........................................................................................... 77

2.5.2 Operation Mode Hierarchy ............................................................................................ 79

2.5.3 Negotiation for Next Mode of Operation ...................................................................... 79

2.5.4 Preserving Link Continuity for Controls, Management and Ethernet ............................ 82

2.5.5 Operation Mode Negotiation Using HLIC messages ...................................................... 84

3 Physical Layer ................................................................................................................ 88

3.1 General .......................................................................................................................... 88

3.1.1 Physical Media Impairments .......................................................................................... 88

3.2 Downstream Phy ............................................................................................................ 89

3.2.1 Downstream Phy Period ................................................................................................. 89

3.2.2 Variable Bit Rate / Error Resistance Level Symbols ....................................................... 89

3.2.3 Downstream Physical Coding Sub-layer (PCS)................................................................ 90

3.2.4 Downstream Physical interface tests ............................................................................. 96

3.2.5 Downstream Transmitter Electrical Specifications ...................................................... 100

3.2.6 Downstream Receiver Electrical Specifications ........................................................... 102

3.3 Upstream Phy ............................................................................................................... 102

3.3.1 Upstream Phy Period ................................................................................................... 102

3.3.2 Upstream Frame Length ............................................................................................... 103

3.3.3 Upstream Physical Coding Sub-layer (PCS) .................................................................. 103

3.3.4 Upstream Physical Interface Tests ............................................................................... 110

3.3.5 Upstream Transmitter Electrical Specifications ........................................................... 113

3.3.6 Upstream Receiver Electrical Specifications ................................................................ 115

3.4 Active Mode Startup ..................................................................................................... 115

3.4.1 Downstream Link Startup Transmission Types ............................................................ 115

3.4.2 Upstream Link Startup Transmission Types ................................................................. 116

3.4.3 Full Startup ............................................................................................................ ....... 116

3.4.4 Fast Startup ............................................................................................................ ...... 123

3.5 HDBaseT Standby Mode Interface (HDSBI) Phy .............................................................. 130

Authorized licensed use limited to: University of Florida. Downloaded on July 03,2016 at 00:15:35 UTC from IEEE Xplore. Restrictions apply.

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