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首页IEEE 802.3bj标准:25G以太网在背板和铜缆上的物理层规范
IEEE 802.3bj标准:25G以太网在背板和铜缆上的物理层规范
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"IEEE 25G以太网规范是网络技术的一个重要标准,它扩展了IEEE 802.3系列标准,旨在提供更高速度的网络连接,特别是在后板和双轴铜线电缆上的100Gbps操作。这个规范不仅定义了25Gbps的物理层(PHY)规格,还涵盖了40Gbps和100Gbps在电气后板和铜缆上的节能以太网(EEE)选项。"
IEEE 25G以太网规范,即IEEE P802.3bj,是一个针对以太网物理层的修订版,它对IEEE 802.3-2012标准进行了扩展。此规范的目的是为了满足不断增长的高带宽需求,尤其是在数据中心和高性能计算环境中的应用。25G以太网的引入,标志着网络速度的一个重要提升,从10Gbps到25Gbps的飞跃,显著提高了数据传输速率。
在物理层(PHY)方面,该规范详细规定了用于25Gbps信号传输的技术参数,包括信号编码、调制、时钟恢复、线路接口以及电磁兼容性(EMC)要求。这些参数确保了25G以太网在实际应用中的可靠性和稳定性,同时考虑到噪声、干扰和信号衰减等因素。
此外,该规范还关注了能效问题,引入了可选的能源高效以太网(EEE,Energy-Efficient Ethernet)功能。EEE是一种设计,能够在网络流量低时降低设备的功耗,从而提高整体的能源效率,这对于需要长时间运行的大型数据中心来说尤其重要。
IEEE P802.3bj/D3.2是这个标准草案的第三个版本,准备进行赞助者投票的重新审议。这个草案的有效期为发布后6个月,或者直至下一个版本发布,以先到者为准。这表明标准制定过程中的迭代和改进,以确保最终发布的标准能够满足业界的需求和技术的发展。
IEEE 25G以太网规范是推动网络技术进步的关键,它不仅提升了网络速度,还兼顾了能效,对于推动数据中心和企业网络基础设施的升级具有重要意义。随着技术的不断发展,可以预见,更高速度的以太网标准将会继续出现,以满足未来更复杂、更高速的数据传输需求。
IEEE P802.3bj/D3.2 Draft Amendment to IEEE Std 802.3-2012
11th April 2014
16 Copyright © 2014 IEEE. All rights reserved.
This is an unapproved IEEE Standards draft, subject to change.
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100GBASE-CR10............................................................................................................... 157
85.13.3 Major capabilities/options................................................................................... 157
85.13.4 PICS proforma tables for Physical Medium Dependent (PMD) sublayer and
baseband medium, type 40GBASE-CR4 and 100GBASE-CR10 ...................... 157
85.13.4.1 PMD functional specifications ....................................................... 157
85.13.4.3 Transmitter specifications .............................................................. 157
91. Reed-Solomon Forward Error Correction (RS-FEC) sublayer for 100GBASE-R PHYs .............. 158
91.1 Overview............................................................................................................................. 158
91.1.1 Scope................................................................................................................... 158
91.1.2 Position of RS-FEC in the 100GBASE-R sublayers .......................................... 158
91.2 FEC service interface.......................................................................................................... 158
91.3 PMA compatibility ............................................................................................................. 159
91.4 Delay constraints................................................................................................................. 160
91.5 Functions within the RS-FEC sublayer .............................................................................. 160
91.5.1 Functional block diagram ................................................................................... 160
91.5.2 Transmit function................................................................................................ 160
91.5.2.1 Lane block synchronization............................................................ 160
91.5.2.2 Alignment lock and deskew............................................................ 160
91.5.2.3 Lane reorder.................................................................................... 160
91.5.2.4 Alignment marker removal............................................................. 160
91.5.2.5 64B/66B to 256B/257B transcoder................................................. 162
91.5.2.6 Alignment marker mapping and insertion ...................................... 163
91.5.2.7 Reed-Solomon encoder................................................................... 165
91.5.2.8 Symbol distribution......................................................................... 167
91.5.2.9 Transmit bit ordering ...................................................................... 167
91.5.3 Receive function ................................................................................................. 167
91.5.3.1 Alignment lock and deskew............................................................ 167
91.5.3.2 Lane reorder.................................................................................... 169
91.5.3.3 Reed-Solomon decoder................................................................... 169
91.5.3.4 Alignment marker removal............................................................. 170
91.5.3.5 256B/257B to 64B/66B transcoder................................................. 170
91.5.3.6 Block distribution ........................................................................... 171
91.5.3.7 Alignment marker mapping and insertion ...................................... 171
91.5.3.8 Receive bit ordering........................................................................ 174
91.5.4 Detailed functions and state diagrams ................................................................ 174
91.5.4.1 State diagram conventions.............................................................. 174
91.5.4.2 State variables................................................................................. 174
91.5.4.3 State diagrams................................................................................. 177
91.6 RS-FEC MDIO function mapping...................................................................................... 181
91.6.1 FEC_bypass_correction_enable.......................................................................... 183
91.6.2 FEC_bypass_indication_enable.......................................................................... 183
91.6.3 FEC_bypass_correction_ability.......................................................................... 183
91.6.4 FEC_bypass_indication_ability.......................................................................... 183
91.6.5 hi_ser................................................................................................................... 183
91.6.6 amps_lock<x>..................................................................................................... 183
91.6.7 fec_align_status .................................................................................................. 183
91.6.8 FEC_corrected_cw_counter................................................................................ 183
91.6.9 FEC_uncorrected_cw_counter............................................................................ 184
91.6.10 FEC_lane_mapping<x> ...................................................................................... 184
91.6.11 FEC_symbol_error_counter_i ............................................................................ 184
91.6.12 align_status ......................................................................................................... 184
91.6.13 BIP_error_counter_i ........................................................................................... 184
Draft Amendment to IEEE Std 802.3-2012 IEEE P802.3bj/D3.2
11th April 2014
Copyright © 2014 IEEE. All rights reserved. 17
This is an unapproved IEEE Standards draft, subject to change.
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91.6.14 lane_mapping<x>................................................................................................ 184
91.6.15 block_lock<x> .................................................................................................... 184
91.6.16 am_lock<x> ........................................................................................................ 184
91.7 Protocol implementation conformance statement (PICS) proforma for Clause 91, Reed-
Solomon Forward Error Correction (RS-FEC) sublayer for 100GBASE-R PHYs............ 185
91.7.1 Introduction......................................................................................................... 185
91.7.2 Identification....................................................................................................... 185
91.7.2.1 Implementation identification......................................................... 185
91.7.2.2 Protocol summary........................................................................... 185
91.7.3 Major capabilities/options................................................................................... 186
91.7.4 PICS proforma tables for Reed-Solomon Forward Error Correction (RS-FEC)
sublayer for 100GBASE-R PHYs....................................................................... 186
91.7.4.1 Transmit function............................................................................ 186
91.7.4.2 Receive function ............................................................................. 187
91.7.4.3 State diagrams................................................................................. 188
92. Physical Medium Dependent (PMD) sublayer and baseband medium, type 100GBASE-CR4..... 189
92.1 Overview............................................................................................................................. 189
92.2 Physical Medium Dependent (PMD) service interface ...................................................... 190
92.3 PCS requirements for Auto-Negotiation (AN) service interface........................................ 191
92.4 Delay constraints................................................................................................................. 191
92.5 Skew constraints ................................................................................................................. 191
92.6 PMD MDIO function mapping........................................................................................... 192
92.7 PMD functional specifications............................................................................................ 193
92.7.1 Link block diagram............................................................................................. 193
92.7.2 PMD Transmit function...................................................................................... 195
92.7.3 PMD Receive function........................................................................................ 195
92.7.4 Global PMD signal detect function .................................................................... 195
92.7.5 PMD lane-by-lane signal detect function ........................................................... 195
92.7.6 Global PMD transmit disable function............................................................... 196
92.7.7 PMD lane-by-lane transmit disable function...................................................... 196
92.7.8 Loopback mode................................................................................................... 196
92.7.9 PMD fault function............................................................................................. 196
92.7.10 PMD transmit fault function............................................................................... 196
92.7.11 PMD receive fault function................................................................................. 197
92.7.12 PMD control function......................................................................................... 197
92.8 100GBASE-CR4 electrical characteristics......................................................................... 198
92.8.1 Signal levels........................................................................................................ 198
92.8.2 Signal paths......................................................................................................... 198
92.8.3 Transmitter characteristics.................................................................................. 198
92.8.3.1 Signal levels.................................................................................... 199
92.8.3.2 Transmitter differential output return loss...................................... 200
92.8.3.3 Common-mode to differential mode output return loss.................. 200
92.8.3.4 Common-mode to common-mode output return loss..................... 201
92.8.3.5 Transmitter output waveform ......................................................... 202
92.8.3.6 Insertion loss TP0 to TP2 or TP3 to TP5........................................ 204
92.8.3.7 Transmitter output noise and distortion.......................................... 205
92.8.3.8 Transmitter output jitter.................................................................. 205
92.8.3.9 Signaling rate range ........................................................................ 207
92.8.4 Receiver characteristics ...................................................................................... 207
92.8.4.1 Receiver input amplitude tolerance ................................................ 208
92.8.4.2 Receiver differential input return loss ............................................ 208
92.8.4.3 Differential to common-mode input return loss ............................. 208
IEEE P802.3bj/D3.2 Draft Amendment to IEEE Std 802.3-2012
11th April 2014
18 Copyright © 2014 IEEE. All rights reserved.
This is an unapproved IEEE Standards draft, subject to change.
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92.8.4.4 Receiver interference tolerance test................................................ 208
92.8.4.5 Receiver jitter tolerance.................................................................. 211
92.8.4.6 Signaling rate range ........................................................................ 211
92.9 Channel characteristics ....................................................................................................... 211
92.10 Cable assembly characteristics ........................................................................................... 212
92.10.1 Characteristic impedance and reference impedance........................................... 212
92.10.2 Cable assembly insertion loss............................................................................. 212
92.10.3 Cable assembly differential return loss............................................................... 214
92.10.4 Differential to common-mode return loss........................................................... 214
92.10.5 Differential to common-mode conversion loss................................................... 216
92.10.6 Common-mode to common-mode return loss .................................................... 216
92.10.7 Cable assembly Channel Operating Margin ....................................................... 216
92.10.7.1 Channel signal path......................................................................... 216
92.10.7.2 Channel crosstalk paths .................................................................. 217
92.11 Test fixtures ........................................................................................................................ 218
92.11.1 TP2 or TP3 test fixture........................................................................................ 218
92.11.1.1 Test fixture return loss.................................................................... 218
92.11.1.2 Test fixture insertion loss................................................................ 218
92.11.2 Cable assembly test fixture................................................................................. 220
92.11.3 Mated test fixtures .............................................................................................. 220
92.11.3.1 Mated test fixtures insertion loss .................................................... 220
92.11.3.2 Mated test fixtures return loss......................................................... 221
92.11.3.3 Mated test fixtures common-mode conversion insertion loss ........ 222
92.11.3.4 Mated test fixtures common-mode return loss ............................... 222
92.11.3.5 Mated test fixtures common-mode to differential mode return loss 224
92.11.3.6 Mated test fixtures integrated crosstalk noise................................. 224
92.12 MDI specification ............................................................................................................... 226
92.12.1 100GBASE-CR4 MDI connectors...................................................................... 227
92.12.1.1 Style-1 100GBASE-CR4 MDI connectors..................................... 227
92.12.1.2 Style-2 100GBASE-CR4 MDI connectors..................................... 228
92.13 Environmental specifications.............................................................................................. 229
92.14 Protocol implementation conformance statement (PICS) proforma for Clause 92, Physical
Medium Dependent (PMD) sublayer and baseband medium, type 100GBASE-CR4 ....... 230
92.14.1 Introduction......................................................................................................... 230
92.14.2 Identification....................................................................................................... 230
92.14.2.1 Implementation identification......................................................... 230
92.14.2.2 Protocol summary........................................................................... 230
92.14.3 Major capabilities/options................................................................................... 231
92.14.4 PICS proforma tables for Physical Medium Dependent (PMD) sublayer and
baseband medium, type 100GBASE-CR4.......................................................... 232
92.14.4.1 PMD functional specifications........................................................ 232
92.14.4.2 Management functions.................................................................... 233
92.14.4.3 Transmitter specifications .............................................................. 234
92.14.4.4 Receiver specifications .................................................................. 235
92.14.4.5 Cable assembly specifications ....................................................... 236
92.14.4.6 MDI connector specifications......................................................... 237
92.14.4.7 Environmental specifications ......................................................... 237
93. Physical Medium Dependent (PMD) sublayer and baseband medium, type 100GBASE-KR4 .... 238
93.1 Overview............................................................................................................................. 238
93.2 Physical Medium Dependent (PMD) service interface ...................................................... 239
93.3 PCS requirements for Auto-Negotiation (AN) service interface........................................ 240
93.4 Delay constraints................................................................................................................. 240
Draft Amendment to IEEE Std 802.3-2012 IEEE P802.3bj/D3.2
11th April 2014
Copyright © 2014 IEEE. All rights reserved. 19
This is an unapproved IEEE Standards draft, subject to change.
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93.5 Skew constraints ................................................................................................................. 240
93.6 PMD MDIO function mapping........................................................................................... 241
93.7 PMD functional specifications............................................................................................ 242
93.7.1 Link block diagram............................................................................................. 242
93.7.2 PMD Transmit function...................................................................................... 243
93.7.3 PMD Receive function........................................................................................ 243
93.7.4 Global PMD signal detect function .................................................................... 243
93.7.5 PMD lane-by-lane signal detect function ........................................................... 243
93.7.6 Global PMD transmit disable function............................................................... 244
93.7.7 PMD lane-by-lane transmit disable function...................................................... 244
93.7.8 Loopback mode................................................................................................... 244
93.7.9 PMD fault function............................................................................................. 244
93.7.10 PMD transmit fault function............................................................................... 244
93.7.11 PMD receive fault function................................................................................. 245
93.7.12 PMD control function......................................................................................... 245
93.8 100GBASE-KR4 electrical characteristics......................................................................... 246
93.8.1 Transmitter characteristics.................................................................................. 246
93.8.1.1 Transmitter test fixture.................................................................... 246
93.8.1.2 Signaling rate and range ................................................................. 248
93.8.1.3 Signal levels.................................................................................... 248
93.8.1.4 Transmitter output return loss......................................................... 249
93.8.1.5 Transmitter output waveform ......................................................... 249
93.8.1.6 Transmitter output noise and distortion.......................................... 251
93.8.1.7 Transmitter output jitter.................................................................. 252
93.8.2 Receiver characteristics ...................................................................................... 252
93.8.2.1 Receiver test fixture........................................................................ 252
93.8.2.2 Receiver input return loss ............................................................... 253
93.8.2.3 Receiver interference tolerance ...................................................... 253
93.8.2.4 Receiver jitter tolerance.................................................................. 254
93.9 Channel characteristics ....................................................................................................... 256
93.9.1 Channel Operating Margin ................................................................................. 256
93.9.2 Insertion loss....................................................................................................... 256
93.9.3 Return loss .......................................................................................................... 256
93.9.4 AC-coupling........................................................................................................ 258
93.10 Environmental specifications.............................................................................................. 258
93.10.1 General safety ..................................................................................................... 258
93.10.2 Network safety.................................................................................................... 259
93.10.3 Installation and maintenance guidelines............................................................. 259
93.10.4 Electromagnetic compatibility............................................................................ 259
93.10.5 Temperature and humidity.................................................................................. 259
93.11 Protocol implementation conformance statement (PICS) proforma for Clause 93, Physical
Medium Dependent (PMD) sublayer and baseband medium, type 100GBASE-KR4....... 260
93.11.1 Introduction......................................................................................................... 260
93.11.2 Identification....................................................................................................... 260
93.11.2.1 Implementation identification......................................................... 260
93.11.2.2 Protocol summary........................................................................... 260
93.11.3 Major capabilities/options................................................................................... 261
93.11.4 PICS proforma tables for Physical Medium Dependent (PMD) sublayer and
baseband medium, type 100GBASE-KR4.......................................................... 262
93.11.4.1 Functional specifications ................................................................ 262
93.11.4.2 Transmitter characteristics.............................................................. 263
93.11.4.3 Receiver characteristics .................................................................. 265
93.11.4.4 Channel characteristics ................................................................... 266
93.11.4.5 Environmental specifications.......................................................... 266
IEEE P802.3bj/D3.2 Draft Amendment to IEEE Std 802.3-2012
11th April 2014
20 Copyright © 2014 IEEE. All rights reserved.
This is an unapproved IEEE Standards draft, subject to change.
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94. Physical Medium Attachment (PMA) sublayer, Physical Medium Dependent (PMD) sublayer, and
baseband medium, type 100GBASE-KP4........................................................................................... 267
94.1 Overview............................................................................................................................. 267
94.2 Physical Medium Attachment (PMA) Sublayer ................................................................. 268
94.2.1 PMA Service Interface........................................................................................ 268
94.2.1.1 PMA:IS_UNITDATA_i.request..................................................... 269
94.2.1.2 PMA:IS_UNITDATA_i.indication ................................................ 269
94.2.1.3 PMA:IS_SIGNAL.indication ......................................................... 270
94.2.1.4 PMA:IS_TX_MODE.request ......................................................... 270
94.2.1.5 PMA:IS_RX_MODE.request ......................................................... 271
94.2.1.6 PMA:IS_ENERGY_DETECT.indication....................................... 271
94.2.1.7 PMA:IS_RX_TX_MODE.indication ............................................. 271
94.2.2 PMA Transmit Functional Specifications........................................................... 272
94.2.2.1 FEC Interface.................................................................................. 273
94.2.2.2 Overhead Frame.............................................................................. 273
94.2.2.3 Overhead......................................................................................... 273
94.2.2.4 Termination Blocks......................................................................... 274
94.2.2.5 Gray Mapping................................................................................. 275
94.2.2.6 Precoding ........................................................................................ 275
94.2.2.7 PAM4 encoding.............................................................................. 275
94.2.2.8 PMD Interface................................................................................. 276
94.2.3 PMA Receive Functional Specifications............................................................ 276
94.2.3.1 Overhead......................................................................................... 277
94.2.4 Skew constraints ................................................................................................. 277
94.2.5 Delay constraints................................................................................................. 277
94.2.6 Link status........................................................................................................... 277
94.2.7 PMA local loopback mode ................................................................................. 277
94.2.8 PMA remote loopback mode (optional) ............................................................. 278
94.2.9 PMA test patterns................................................................................................ 278
94.2.9.1 JP03A test pattern........................................................................... 278
94.2.9.2 JP03B test pattern ........................................................................... 278
94.2.9.3 Quaternary PRBS13 test pattern..................................................... 278
94.2.9.4 Transmitter linearity test pattern..................................................... 279
94.2.10 PMA MDIO function mapping........................................................................... 279
94.3 Physical Medium Dependent (PMD) Sublayer .................................................................. 280
94.3.1 Physical Medium Dependent (PMD) service interface ...................................... 280
94.3.1.1 PMD:IS_UNITDATA_i.request..................................................... 281
94.3.1.2 PMD:IS_UNITDATA_i.indication ................................................ 281
94.3.1.3 PMD:IS_SIGNAL.indication ......................................................... 282
94.3.2 PCS requirements for Auto-Negotiation (AN) service interface........................ 282
94.3.3 Delay constraints................................................................................................. 282
94.3.4 Skew constraints ................................................................................................. 282
94.3.5 PMD MDIO function mapping........................................................................... 283
94.3.6 PMD functional specifications............................................................................ 284
94.3.6.1 Link block diagram......................................................................... 284
94.3.6.2 PMD Transmit function.................................................................. 285
94.3.6.3 PMD Receive function.................................................................... 285
94.3.6.4 Global PMD signal detect function ................................................ 285
94.3.6.5 PMD lane-by-lane signal detect function ....................................... 285
94.3.6.6 Global PMD transmit disable function........................................... 285
94.3.6.7 PMD lane-by-lane transmit disable function.................................. 286
94.3.6.8 Loopback mode............................................................................... 286
94.3.7 PMD fault function............................................................................................. 286
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