6G+bps至25G+bps CEI电气接口与抖动互操作性协议

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"OIF_CEI_03.0.pdf" 涉及的是 Optical Internetworking Forum（OIF）的 Common Electrical I/O (CEI) 实施协议，特别是关于6Gbps、11Gbps以及25Gbps以上速率的电气接口和抖动互操作性协议。该文档详细描述了在高速光网络接口中的电气接口标准，旨在促进数据和光学领域之间的互通性，以加速高性能通信系统的部署。 OIF-CEI-03.0 是一个关键的技术规范，它定义了用于高速串行数据传输的电气接口的标准。这个协议对电信和数据中心行业的高带宽需求至关重要，因为25Gbps及以上速率的SerDes（串行器/解串器）技术是实现高速数据传输的核心组件。SerDes负责将并行数据转换为串行数据，以便通过单个或多个通道进行长距离传输，然后再恢复为并行形式。协议中可能包括以下几个方面的内容： 1. **电气规格**：定义了接口的电气特性，如信号幅度、阻抗匹配、噪声容限和眼图要求，以确保数据传输的可靠性和准确性。 2. **抖动规范**：抖动是影响数据传输质量的重要因素，协议会规定允许的最大抖动量，以保证不同设备间的互操作性。 3. **信号完整性**：讨论如何保持信号在整个传输路径中的完整性，包括信号衰减、回损和串扰的管理。 4. **热插拔和电源管理**：高速接口可能需要在系统运行时进行连接和断开，因此协议可能涉及热插拔兼容性和电源管理策略。 5. **协议兼容性**：OIF-CEI-P-02.0 协议则可能更专注于协议层面的互操作性，确保不同供应商的设备可以无缝协同工作。 6. **测试和验证**：文档可能会提供一套测试程序和指标，以确保设备符合CEI-03.0的规范。 7. **物理层(PHY)设计指导**：为硬件设计者提供了指导，帮助他们构建符合标准的高速PHY层电路。通过这样的标准化工作，OIF致力于推动行业标准的统一，降低设备之间的兼容性问题，从而降低开发成本并提高整体系统的可靠性。这对于构建高效能的数据中心、云计算基础设施和高性能计算平台至关重要。这份文档对于设计、制造和测试高速光网络设备的工程师来说是一份极其重要的参考资料。

Implementation Agreement OIF-CEI-03.0 Common Electrical I/O (CEI)

16 Clause 0 : Document Structure and Contents - Optical Internetworking Forum

9.2.7 Channel Compliance .............................................................................. 185

9.2.7.1 CEI-11G-LR Channel Compliance........................................... 185

9.2.7.2 CEI-11G-MR Channel Compliance.......................................... 186

9.3 Electrical Characteristics, CEI-11G-LR and CEI-11G-MR ................................ 186

9.3.1 Driver Characteristics ............................................................................. 186

9.3.1.1 Driver Baud Rate ..................................................................... 188

9.3.1.2 Driver Amplitude and Swing..................................................... 188

9.3.1.3 Driver Resistance and Return Loss ......................................... 188

9.3.1.4 Driver Lane-to-Lane Skew ....................................................... 188

9.3.1.5 Driver Short Circuit Current...................................................... 188

9.3.1.6 Driver Template and Jitter........................................................ 188

9.3.2 CEI-11G-LR Receiver Characteristics.................................................... 189

9.3.2.1 Input Baud Rate ....................................................................... 189

9.3.2.2 Absolute Input Voltage............................................................. 190

9.3.2.3 Input Resistance and Return Loss........................................... 190

9.3.2.4 Input Signal Amplitude ............................................................. 190

9.3.2.5 Input Lane-to-Lane Skew......................................................... 190

9.3.3 CEI-11G-MR Receiver Characteristics................................................... 190

9.3.3.1 Input Baud Rate ....................................................................... 191

9.3.3.2 Reference Input Signals........................................................... 192

9.3.3.3 Input Resistance and Return Loss........................................... 192

9.3.3.4 Input Lane-to-Lane Skew......................................................... 192

9.A Informative Jitter Budgets ................................................................................. 193

9.A.1 Informative Jitter Budget for Long Reach............................................... 193

9.A.2 Informative Jitter Budget for Medium Reach .......................................... 193

9.B StatEye.org templates....................................................................................... 195

9.B.1 StatEye.org templates for CEI-11G-LR, reference receiver A................ 195

9.B.2 StatEye.org Templates for CEI-11G-LR, reference receiver B .............. 197

9.B.3 StatEye.org templates for CEI-11G-MR reach ....................................... 199

10 CEI-28G-SR Short Reach Interface......................................................................... 203

10.1 Requirements.................................................................................................... 203

10.2 General Requirements ...................................................................................... 203

10.2.1 Data Patterns ......................................................................................... 203

10.2.2 Signal levels ........................................................................................... 203

10.2.3 Signal Definitions.................................................................................... 203

10.2.4 Bit Error Ratio......................................................................................... 204

10.2.5 Ground Differences ................................................................................ 204

10.2.6 Channel Compliance .............................................................................. 204

10.2.6.1 Reference Model...................................................................... 204

10.2.6.2 Insertion Loss........................................................................... 205

10.2.6.3 Fitted insertion loss .................................................................. 207

10.2.6.4 Insertion loss deviation (ILD) ................................................... 207

10.2.6.5 Channel differential return loss ................................................ 208

10.2.6.6 Channel integrated crosstalk noise.......................................... 208

10.3 Electrical Characteristics................................................................................... 210

10.3.1 Transmitter Characteristics .................................................................... 210

10.3.1.1 Transmitter Baud Rate............................................................. 211

10.3.1.2 Transmitter Amplitude and Swing ............................................ 211

10.3.1.3 Transmitter Resistance and Return Loss................................. 211

10.3.1.4 Transmitter Lane-to-Lane Skew............................................... 211

10.3.1.5 Transmitter Short Circuit Current ............................................. 212

10.3.1.6 Transmitter output waveform requirements ............................. 212

10.3.2 Receiver Characteristics ........................................................................ 217

10.3.2.1 Input Baud Rate ....................................................................... 217

Implementation Agreement OIF-CEI-03.0 Common Electrical I/O (CEI)

Optical Internetworking Forum - Clause 0 : Document Structure and Contents 17

10.3.2.2 Reference Input Signals........................................................... 218

10.3.2.3 Input Resistance and Return Loss ........................................... 218

10.3.2.4 Input Lane-to-Lane Skew ......................................................... 218

10.3.2.5 Absolute Input Voltage............................................................. 218

11 CEI-25G-LR Long Reach Interface.......................................................................... 219

11.1 Requirements .................................................................................................... 219

11.2 General Requirements ...................................................................................... 219

11.2.1 Data Patterns ......................................................................................... 219

11.2.2 Signal levels ........................................................................................... 219

11.2.3 Signal Definitions.................................................................................... 219

11.2.4 Bit Error Ratio ......................................................................................... 220

11.2.5 Ground Differences ................................................................................ 220

11.2.6 Channel Compliance .............................................................................. 220

11.2.6.1 Reference Model...................................................................... 220

11.2.6.2 Insertion Loss........................................................................... 221

11.2.6.3 Fitted insertion loss .................................................................. 223

11.2.6.4 Insertion loss deviation (ILD).................................................... 223

11.2.6.5 Channel Return Loss ............................................................... 224

11.2.6.6 Channel integrated crosstalk noise.......................................... 224

11.3 Electrical Characteristics ................................................................................... 226

11.3.1 Transmitter Characteristics..................................................................... 226

11.3.1.1 Transmitter Baud Rate ............................................................. 227

11.3.1.2 Transmitter Amplitude and Swing ............................................ 227

11.3.1.3 Transmitter Resistance and Return Loss................................. 227

11.3.1.4 Transmitter Lane-to-Lane Skew............................................... 227

11.3.1.5 Transmitter Short Circuit Current ............................................. 228

11.3.1.6 Transmitter output waveform requirements ............................. 228

11.3.2 Receiver Characteristics......................................................................... 233

11.3.2.1 Input Baud Rate ....................................................................... 233

11.3.2.2 Reference Input Signals........................................................... 234

11.3.2.3 Input Resistance and Return Loss ........................................... 234

11.3.2.4 Input Lane-to-Lane Skew ......................................................... 234

11.3.2.5 Absolute Input Voltage............................................................. 234

12 Test Methodologies for CEI-28G-SR and CEI-25G-LR .......................................... 235

12.1 TX jitter measurement methodology ................................................................. 235

12.1.1 Data Dependent Jitter (DDJ) measurement ........................................... 236

12.2 Channel compliance methodology .................................................................... 237

12.2.1 Channel Compliance .............................................................................. 237

12.2.1.1 Fitted insertion loss .................................................................. 237

12.2.1.2 Integrated crosstalk noise ........................................................ 239

12.3 Common Mode Noise ....................................................................................... 241

Implementation Agreement OIF-CEI-03.0 Common Electrical I/O (CEI)

18 Clause 0 : Document Structure and Contents - Optical Internetworking Forum

List of Figures

Figure 1-1 Definition of Driver Amplitude and Swing................................................... 36

Figure 1-2 Skew and Relative Wander between in band Signals................................ 37

Figure 1-3 Total Wander of a Signal............................................................................ 37

Figure 1-4 Transmit Eye Mask .................................................................................... 39

Figure 1-5 Receiver Input Mask .................................................................................. 40

Figure 1-6 Reference Model........................................................................................ 41

Figure 1-7 Signal Diagram........................................................................................... 42

Figure 1-8 Some typical systems ................................................................................ 44

Figure 2-1 CID Jitter Tolerance Pattern....................................................................... 45

Figure 2-2 CID Jitter Tolerance Pattern....................................................................... 53

Figure 2-3 Total Wander Mask .................................................................................... 57

Figure 2-4 Relative Wander Mask ............................................................................... 57

Figure 2-5 Random Jitter Spectrum ............................................................................ 58

Figure 2-6 Graphical Representation of Receiver Pulse ............................................. 60

Figure 2-7 Transmit Pulse ........................................................................................... 61

Figure 2-8 Transmitter FIR Filter Function .................................................................. 61

Figure 2-9 Receiver Pulse Definition ........................................................................... 62

Figure 2-10 Crosstalk Pulse Definition .......................................................................... 63

Figure 2-11 Decision Feedback Equalizer..................................................................... 63

Figure 2-12 Feed Forward Filter.................................................................................... 64

Figure 2-13 Generation of Total and Relative Wander.................................................. 67

Figure 2-14 Jitter Probability Density Function.............................................................. 68

Figure 2-15 Example of Total Jitter PDF ....................................................................... 70

Figure 2-16 Example of Total Jitter CDF ....................................................................... 70

Figure 2-17 Bathtub Definition....................................................................................... 72

Figure 2-18 Example of Bounded Gaussian.................................................................. 73

Figure 2-19 Statistics of Pulse Response Cursor.......................................................... 74

Figure 2-20 Variation of the c0 sampling time ............................................................... 75

Figure 2-21 Varying the Receiver Sampling Point......................................................... 77

Figure 2-22 Generation of the Data Eye and Bathtub ................................................... 79

Figure 2-23 Statistical Eye............................................................................................. 80

Figure 2-24 Short Stress Pattern Random (SSPR) ....................................................... 81

Figure 2-25 Short Stress Pattern SDH 16 (SSPS-16) ................................................... 82

Figure 2-26 Short Stress Pattern SDH 64 (SSPS-64) ................................................... 83

Figure 2-27 BERT with Golden PLL .............................................................................. 91

Figure 2-28 Spectral Measurement Setup..................................................................... 93

Figure 2-29 Single Side Band Relative Power Spectrum for Phase Modulated Signal. 94

Figure 2-30 Transmit Wander Lab Setup ...................................................................... 95

Figure 2-31 Relative Wander Lab Setup ....................................................................... 96

Figure 2-32 Jitter Tolerance with Relative Wander Lab Setup ...................................... 97

Figure 2-33 Jitter Tolerance with no Relative Wander .................................................. 99

Figure 2-34 Jitter Tolerance with Defined ISI .............................................................. 100

Figure 2-35 Jitter Transfer Lab Setup.......................................................................... 101

Figure 2-36 S-parameter Port definitions .................................................................... 102

Figure 2-37 Eye Mask Measurement with Golden PLL ............................................... 104

Figure 2-38 Example Data Mask ................................................................................. 107

Figure 2-39 Example Data Mask ................................................................................. 108

Figure 2-40 Cumulative Distribution Function of Maximum Amplitude........................ 109

Figure 3-1 Driver and Input Differential Return Loss ................................................. 114

Figure 3-2 Termination Example ............................................................................... 115

Implementation Agreement OIF-CEI-03.0 Common Electrical I/O (CEI)

Optical Internetworking Forum - Clause 0 : Document Structure and Contents 19

Figure 3-3 Transmission Line as 2-port..................................................................... 117

Figure 3-4 PI Network Termination............................................................................ 118

Figure 3-5 Measurement of Zodd, Zeven .................................................................. 118

Figure 3-6 Minimisation of crosstalk at IC pins. ......................................................... 121

Figure 3-7 Minimisation of crosstalk at connector pins.............................................. 122

Figure 3-8 Minimisation of crosstalk over backplane................................................. 122

Figure 3-9 Equation based Channel Loss curves...................................................... 123

Figure 8-1 Jitter Ingress Receiver Input Telecom Sinusoidal Jitter ........................... 173

Figure 8-2 Jitter Egress Receiver Input Telecom Sinusoidal Jitter ............................ 174

Figure 8-3 Jitter Ingress Receiver Input Datacom Sinusoidal Jitter........................... 176

Figure 8-4 Reference Model...................................................................................... 181

Figure 10-1 CEI-28G-SR Reference Model................................................................. 204

Figure 10-2 CEI-28G-SR Normative Channel Insertion Loss at 28.05 Gsym/s........... 206

Figure 10-3 Illustration integrated crosstalk noise limits.............................................. 209

Figure 11-1 CEI-25G-LR Reference Model ................................................................. 220

Figure 11-2 CEI-25G-LR Normative Channel Insertion Loss at 25.80 Gsym/s. .......... 222

Figure 11-3 Illustration integrated crosstalk noise limits.............................................. 225

Figure 12-1 DDJ Measurement Method ...................................................................... 236

Implementation Agreement OIF-CEI-03.0 Common Electrical I/O (CEI)

20 Clause 0 : Document Structure and Contents - Optical Internetworking Forum

List of Tables

Table 1-1 Abbreviations ............................................................................................. 30

Table 1-2 General Definitions (with exception of Jitter and Wander) ......................... 32

Table 1-3 Jitter and Wander Definitions ..................................................................... 34

Table 1-4 Transmitter Electrical Output Specification ................................................ 38

Table 1-5 Transmitter Output Jitter Specification ...................................................... 38

Table 1-6 Receiver Electrical Input Specification ....................................................... 39

Table 1-7 Receiver Input Jitter Specification ............................................................. 40

Table 1-8 Receive Signal Summary........................................................................... 43

Table 1-9 Transmit Signal Summary.......................................................................... 43

Table 1-10 Example specification of reference clock ................................................... 43

Table 2-1 Use of CEI Test Patterns ........................................................................... 84

Table 3-1 Definition of load types............................................................................. 112

Table 3-2 Curve fit Coefficients ................................................................................ 123

Table 6-1 CEI-6G-SR Transmitter Output Electrical Specifications ......................... 139

Table 6-2 CEI-6G-SR Transmitter Output Jitter Specifications ................................ 140

Table 6-3 CEI-6G-SR Driver Return Loss Parameters ............................................ 141

Table 6-4 CEI-6G-SR Near-End (Tx) Template Intervals......................................... 142

Table 6-5 CEI-6G-SR Receiver Electrical Input Specifications ................................ 142

Table 6-6 CEI-6G-SR Receiver Input Jitter Tolerance Specifications...................... 143

Table 6-7 CEI-6G-SR Input Return Loss Parameters .............................................. 145

Table 6-8 CEI-6G-SR Far-End (Rx) Template Intervals........................................... 145

Table 6-9 CEI-6G-SR Informative Loss, Skew and Jitter Budget............................. 146

Table 6-10 CEI-6G-SR High Frequency Jitter Budget ............................................... 146

Table 7-1 CEI-6G-LR Receiver Equalization Output Eye Mask ............................... 153

Table 7-2 CEI-6G-LR Transmitter Output Electrical Specifications.......................... 154

Table 7-3 CEI-6G-LR Transmitter Output Jitter Specifications ................................ 154

Table 7-4 CEI-6G-LR Driver Return Loss Parameters............................................. 155

Table 7-5 CEI-6G-LR Near-End Template Intervals ................................................ 156

Table 7-6 CEI-6G-LR Training Pattern..................................................................... 157

Table 7-7 CEI-6G-LR Receiver Electrical Input Specifications ................................ 157

Table 7-8 CEI-6G-LR Input Return Loss Parameters .............................................. 159

Table 7-9 CEI-6G-LR Informative Loss, Skew and Jitter Budget ............................. 160

Table 7-10 CEI-6G-LR High Frequency Jitter Budget................................................ 160

Table 8-1 Transmitter Electrical Output Specification. ............................................. 168

Table 8-2 Transmitter Output Jitter Specification ..................................................... 168

Table 8-3 Driver Return Loss Parameters................................................................ 169

Table 8-4 Receiver Electrical Input Specification ..................................................... 170

Table 8-5 Receiver Input Jitter Specification ........................................................... 170

Table 8-6 Driver Return Loss Parameters................................................................ 171

Table 8-7 Telecom Signal Conditioner, Egress direction ......................................... 175

Table 8-8 Telecom Signal Conditioner, Ingress Direction ........................................ 175

Table 8-9 Telecom Egress Jitter Generation budget................................................ 175

Table 8-10 Telecom Egress Driver Jitter Generation ................................................. 176

Table 8-11 Datacom Signal Conditioner Egress direction.......................................... 177

Table 8-12 Datacom Signal Conditioner Ingress Direction ........................................ 177

Table 8-13 Datacom Signal Conditioner Ingress Direction ........................................ 177

Table 8-14 Informative Jitter Budget .......................................................................... 178

Table 9-1 CEI-11G-LR Receiver Equalization Output Eye Mask ............................. 186

Table 9-2 Transmitter Output Electrical Specifications ............................................ 187

Table 9-3 Transmitter Output Jitter Specifications ................................................... 187

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