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首页6G+bps至25G+bps CEI电气接口与抖动互操作性协议
6G+bps至25G+bps CEI电气接口与抖动互操作性协议
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更新于2024-07-15
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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。
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Implementation Agreement OIF-CEI-03.0 Common Electrical I/O (CEI)
16 Clause 0 : Document Structure and Contents - Optical Internetworking Forum
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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
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Implementation Agreement OIF-CEI-03.0 Common Electrical I/O (CEI)
Optical Internetworking Forum - Clause 0 : Document Structure and Contents 17
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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
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Implementation Agreement OIF-CEI-03.0 Common Electrical I/O (CEI)
18 Clause 0 : Document Structure and Contents - Optical Internetworking Forum
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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
![](https://csdnimg.cn/release/download_crawler_static/13703359/bg13.jpg)
Implementation Agreement OIF-CEI-03.0 Common Electrical I/O (CEI)
Optical Internetworking Forum - Clause 0 : Document Structure and Contents 19
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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
![](https://csdnimg.cn/release/download_crawler_static/13703359/bg14.jpg)
Implementation Agreement OIF-CEI-03.0 Common Electrical I/O (CEI)
20 Clause 0 : Document Structure and Contents - Optical Internetworking Forum
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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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