DOCSIS 3.1协议详解：CM-SP-MULPIv3.1-I20-200407

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"CM-SP-MULPIv3.1-I20-200407.pdf" 是一个关于 DOCSIS 3.1 协议的技术文档，该协议详细定义了数据在有线电视网络上传输时，MAC（媒体访问控制）层和上层协议之间的接口规范。正文: DOCSIS（Data-Over-Cable Service Interface Specifications，有线电视数据服务接口规格）是一种广泛用于提供高速互联网接入的标准，尤其在北美地区尤为常见。DOCSIS 3.1 是这个标准的最新版本，显著提升了有线网络的数据传输速度和效率，旨在满足日益增长的宽带需求。 DOCSIS 3.1 在前一版的基础上引入了以下关键特性： 1. **频率分复用**：与 DOCSIS 3.0 相比，DOCSIS 3.1 引入了正交频分多址（OFDM，Orthogonal Frequency Division Multiplexing）技术，允许在更宽的频谱范围内分配更多的信道，提高了频谱利用率。通过OFDM，每个子载波可以独立编码和解码，大大增强了系统的灵活性和容量。 2. **下行多工方式**：DOCSIS 3.1 支持两种下行多工方式——连续相位调制（CPM）和正交幅度调制（QAM）。特别是高阶QAM，如64-QAM、256-QAM甚至更高，能够支持更高的数据速率，使得下行带宽达到Gbps级别。 3. **上行优化**：除了提升下行速度，DOCSIS 3.1 还改进了上行链路，采用基于频分多址（FDMA）的上行多工，使得多个用户可以在同一时间上传数据，提高了上行带宽和并发用户能力。 4. **服务质量（QoS）**：协议提供了对不同类型流量的优先级处理，确保关键服务（如语音通话和视频流）的质量不受影响，即使在网络拥塞时也能保持良好的性能。 5. **频谱管理**：DOCSIS 3.1 包含了更精细的频谱管理和分析工具，使得运营商能更好地监控和优化网络资源，有效防止干扰并提高整体网络性能。 6. **安全增强**：增加了更多的加密和认证机制，以保护用户数据的安全，防止未经授权的访问和攻击。开发DOCSIS 3.1 相关产品和服务的公司和工程师需要遵循这份CM-SP-MULPIv3.1-I20-200407 规范，以确保与其它DOCSIS 3.1 兼容设备的互操作性。然而，重要的是要注意，这份文档仅授权用于开发、教育目的，未经 Cable Labs 的书面许可，不得修改或用于其他目的。同时，使用此协议可能还需要获取第三方的知识产权许可，因为文档可能引用了非 Cable Labs 拥有的其他文档。 DOCSIS 3.1 标准的实施是现代有线网络高速化、智能化的关键，为家庭和企业用户提供了更快的互联网连接，同时也为有线电视运营商提供了扩展服务和提升客户体验的新途径。

CM-SP-MULPIv3.1-I20-200407 Data-Over-Cable Service Interface Specifications

16 CableLabs

04/07/20

Figure 141 - SC-QAM Bonded Initial Ranging ......................................................................................................... 388

Figure 142 - Continue US Ambiguity Initial Ranging ............................................................................................... 390

Figure 143 - Ranging and Automatic Adjustments Procedure for SC-QAM Upstreams .......................................... 392

Figure 144 - Ranging and Automatic Adjustments Procedure for OFDMA Upstreams ........................................... 393

Figure 145 - Unicast Initial Ranging - CM ................................................................................................................ 394

Figure 146 - CM-SG Determination - CMTS ............................................................................................................ 396

Figure 147 - Unicast Initial Ranging - CMTS ........................................................................................................... 398

Figure 148 - Establish IP Connectivity ...................................................................................................................... 399

Figure 149 - IPv4 Only Provisioning Mode .............................................................................................................. 400

Figure 150 - IPv6 Only Provisioning Mode .............................................................................................................. 401

Figure 151 - Alternate Provisioning Mode ................................................................................................................ 402

Figure 152 - Dual-stack Provisioning Mode .............................................................................................................. 403

Figure 153 - ToD and TFTP ...................................................................................................................................... 404

Figure 154 - IPv6 Address Acquisition ..................................................................................................................... 405

Figure 155 - IPv4 Provisioning Message Flow .......................................................................................................... 406

Figure 156 - IPv6 Provisioning Message Flow .......................................................................................................... 409

Figure 157 - CM Register with CMTS - Begin ......................................................................................................... 420

Figure 158 - CM Acquires Receive Channels ........................................................................................................... 421

Figure 159 - CM Acquires SC-QAM Downstream Channel ..................................................................................... 422

Figure 160 - CM Acquires OFDM Downstream Channel ......................................................................................... 423

Figure 161 - CM Acquires Transmit Channels .......................................................................................................... 424

Figure 162 - CM Acquires Upstream Channel .......................................................................................................... 425

Figure 163 - CM Completes Registration .................................................................................................................. 426

Figure 164 - CMTS Registration - Begin .................................................................................................................. 431

Figure 165 - CMTS Registration - Continued ........................................................................................................... 432

Figure 166 - CMTS Registration - End ..................................................................................................................... 433

Figure 167 - Periodic Ranging - CMTS View ........................................................................................................... 438

Figure 168 - Periodic Ranging - CM View ................................................................................................................ 439

Figure 169 - Typical OFDM Profile Test Transaction .............................................................................................. 441

Figure 170 - Aborted OFDM Profile Test Transaction .............................................................................................. 442

Figure 171 - CM OPT State Machine - OPT Idle ...................................................................................................... 443

Figure 172 - CM OPT State Machine - OFDM Profile Test in Progress ................................................................... 444

Figure 173 - CM OPT State Machine - OPT-ACK Pending ..................................................................................... 445

Figure 174 - Linear Feedback Shift Register for Synthetic Data Generation ............................................................ 447

Figure 175 - MAC LFSR Frame ................................................................................................................................ 447

Figure 176 - CM OPT State Machine – OPT Idle ..................................................................................................... 448

Figure 177 - CM OPT State Machine – OPT in Progress .......................................................................................... 449

Figure 178 - CM OPT State Machine – OPT-ACK Pending ..................................................................................... 450

Figure 179 - Lost Lock on an OFDM Channel Procedure ......................................................................................... 455

Figure 180 - CM-STATUS Event Type State Machine ............................................................................................. 462

Figure 181 - DPV Reference Diagram ...................................................................................................................... 471

Figure 182 - DOCSIS Time Protocol System Overview ........................................................................................... 475

Figure 183 - DOCSIS Time Protocol Fixed Latency Path Example ......................................................................... 475

Figure 184 - DTP/PTP Reference Architecture ......................................................................................................... 476

MAC and Upper Layer Protocols Interface Specification CM-SP-MULPIv3.1-I20-200407

04/07/20 CableLabs



Figure 185 - DTP Math and Delays ........................................................................................................................... 478

Figure 186 - True Ranging Offset Example .............................................................................................................. 480

Figure 187 - CMTS is DTP Master ........................................................................................................................... 481

Figure 188 - CM is DTP Master ................................................................................................................................ 481

Figure 189 - DTP System Performance ..................................................................................................................... 482

Figure 190 - Dynamic Service Flow Overview ......................................................................................................... 486

Figure 191 - Dynamic Service Flow State Transition Diagram ................................................................................. 490

Figure 192 - DSA-Locally Initiated Transaction State Transition Diagram .............................................................. 491

Figure 193 - DSA-Remotely Initiated Transaction State Transition Diagram ........................................................... 492

Figure 194 - DSC-Locally Initiated Transaction State Transition Diagram .............................................................. 493

Figure 195 - DSC-Remotely Initiated Transaction State Transition Diagram ........................................................... 494

Figure 196 - DSD-Locally Initiated Transaction State Transition Diagram .............................................................. 495

Figure 197 - Dynamic Deletion (DSD) - Remotely Initiated Transaction State Transition Diagram ........................ 496

Figure 198 - Dynamic Service Addition Initiated from CM ...................................................................................... 497

Figure 199 - Dynamic Service Addition Initiated from CMTS ................................................................................. 498

Figure 200 - DSA-Locally Initiated Transaction Begin State Flow Diagram ............................................................ 499

Figure 201 - DSA-Locally Initiated Transaction DSA-RSP Pending State Flow Diagram ....................................... 500

Figure 202 - DSA-Locally Initiated Transaction Holding State Flow Diagram ........................................................ 501

Figure 203 - DSA-Locally Initiated Transaction Retries Exhausted State Flow Diagram ........................................ 502

Figure 204 - DSA-Locally Initiated Transaction Deleting Service Flow State Flow Diagram ................................. 503

Figure 205 - DSA-Remotely Initiated Transaction Begin State Flow Diagram ........................................................ 504

Figure 206 - DSA-Remotely Initiated Transaction DSA-ACK Pending State Flow Diagram .................................. 505

Figure 207 - DSA-Remotely Initiated Transaction Holding Down State Flow Diagram .......................................... 506

Figure 208 - DSA-Remotely Initiated Transaction Deleting Service State Flow Diagram ....................................... 506

Figure 209 - CM-Initiated DSC ................................................................................................................................. 508

Figure 210 - CMTS-Initiated DSC Modifying a Service Flow.................................................................................. 508

Figure 211 - CMTS-Initiated DSC Modifying an Upstream Drop Classifier ............................................................ 509

Figure 212 - DSC-Locally Initiated Transaction Begin State Flow Diagram ............................................................ 510

Figure 213 - DSC-Locally Initiated Transaction DSC-RSP Pending State Flow Diagram ....................................... 511

Figure 214 - DSC-Locally Initiated Transaction Holding Down State Flow Diagram .............................................. 512

Figure 215 - DSC-Locally Initiated Transaction Retries Exhausted State Flow Diagram......................................... 513

Figure 216 - DSC-Locally Initiated Transaction Deleting Service Flow State Flow Diagram .................................. 514

Figure 217 - DSC-Remotely Initiated Transaction Begin State Flow Diagram......................................................... 515

Figure 218 - DSC-Remotely Initiated Transaction DSC-ACK Pending State Flow Diagram ................................... 516

Figure 219 - DSC-Remotely Initiated Transaction Holding Down State Flow Diagram .......................................... 517

Figure 220 - DSC-Remotely Initiated Transaction Deleting Service Flow State Flow Diagram .............................. 517

Figure 221 - Dynamic Service Deletion Initiated from CM ...................................................................................... 518

Figure 222 - Dynamic Service Deletion Initiated from CMTS.................................................................................. 518

Figure 223 - DSD-Locally Initiated Transaction Begin State Flow Diagram ............................................................ 519

Figure 224 - DSD-Locally Initiated Transaction DSD-RSP Pending State Flow Diagram ....................................... 520

Figure 225 - DSD-Locally Initiated Transaction Holding Down State Flow Diagram ............................................. 521

Figure 226 - DSD-Remotely Initiated Transaction Begin State Flow Diagram ........................................................ 522

Figure 227 - DSD-Remotely Initiated Transaction Holding Down State Flow Diagram .......................................... 523

Figure 228 - Dynamically Changing Channels: CMTS View Part 1 ......................................................................... 528

CM-SP-MULPIv3.1-I20-200407 Data-Over-Cable Service Interface Specifications

18 CableLabs

04/07/20

Figure 229 - Dynamically Changing Channels: CMTS View Part 2 ......................................................................... 529

Figure 230 - Dynamically Changing Channels: CMTS View Part 3 ......................................................................... 530

Figure 231 - Dynamically Changing Channels: CMTS View Part 4 ......................................................................... 531

Figure 232 - Dynamically Changing Channels: CM View ........................................................................................ 532

Figure 233 - CMTS DBC Request (part 1) ................................................................................................................ 547

Figure 234 - CMTS DBC Request (part 2) ................................................................................................................ 548

Figure 235 - CMTS DBC-RSP Pending .................................................................................................................... 549

Figure 236 - CMTS DBC Hold-down ....................................................................................................................... 550

Figure 237 - CM DBC-RSP (part 1) .......................................................................................................................... 551

Figure 238 - CM DBC-RSP (part 2} ......................................................................................................................... 552

Figure 239 - CM DBC-RSP (part 3) .......................................................................................................................... 553

Figure 240 - CM AcquireDS Procedure for SC-QAM .............................................................................................. 554

Figure 241 - CM AcquireDS Procedure for OFDM .................................................................................................. 555

Figure 242 - CM AcquireUS Procedure .................................................................................................................... 556

Figure 243 - CM DBC-ACK Pending ....................................................................................................................... 557

Figure 244 - Energy Management Modes State Diagram .......................................................................................... 564

Figure 245 - Example Energy Management Threshold Operation ............................................................................ 566

Figure 246 - Example Full OFDM Receiver Cycling and PLC Receiver Cycling .................................................... 570

Figure 247 - CM DLS Substate Diagram .................................................................................................................. 571

Figure 248 - Wake Substate transitions for DLS Mode ............................................................................................. 572

Figure 249 - PLC Rx and PLC Sleep Substate transitions for DLS Mode ................................................................ 573

Figure 250 - Example Interaction between Battery Backup and DLS mode ............................................................. 576

Figure 251 - Example D-ONU Front Panel ............................................................................................................... 723

Figure 252 - Binary Configuration File Format ......................................................................................................... 730

Figure 253 - Create TLV Entries for Parameters Required by the CM ..................................................................... 731

Figure 254 - Add Extended CMTS MIC Parameters ................................................................................................. 732

Figure 255 - Add CM MIC ........................................................................................................................................ 732

Figure 256 - Add CMTS MIC ................................................................................................................................... 732

Figure 257 - Add End of Data Marker and Padding .................................................................................................. 733

Figure 258 - Spanning Tree Topology ....................................................................................................................... 788

Figure 259 - Spanning Tree Across CMTSs .............................................................................................................. 789

Figure 260 - Single Downstream and Single Upstream Channels per CM ................................................................ 825

Figure 261 - Bonding Group Example ...................................................................................................................... 827

Figure 262 - Transmission and Deference State Transition Diagram (Multiple Transmit Channel Mode) ............... 830

Figure 263 - Transmission and Deference State Transition Diagram ........................................................................ 835

Figure 264 - Example Jitter with Multiple Grants per SID ........................................................................................ 840

Figure 265 - VAD Start-Up and Stop ........................................................................................................................ 842

Figure 266 - Example 1 - Modem can't range on all upstreams................................................................................. 845

Figure 267 - Example 2 - Option 4 ............................................................................................................................ 846

Figure 268 - Specification and Description Language (SDL) Notation .................................................................... 847

Figure 269 - Multicast Session Replication for a client behind a 2.0 CM ................................................................. 850

Figure 270 - Multicast Session Replication for a client behind a Hybrid CM capable of FC-Type 10 ..................... 851

Figure 271 - Multicast Session Replication for a client behind a 3.0 CM ................................................................. 852

Figure 272 - Multicast Session Replication to Clients Behind Both a 3.0 CM and a 2.0 CM on the Same

Downstream Channel (Subcase 1) ..................................................................................................................... 854

MAC and Upper Layer Protocols Interface Specification CM-SP-MULPIv3.1-I20-200407

04/07/20 CableLabs



Figure 273 - Bonded and Non-bonded Replications of a Multicast Session on an Overlapping Downstream Channel

Using FC 10 Isolation Technique (Subcase 2) .................................................................................................. 855

Figure 274 - Multicast Session Replications to Clients Behind Both a 3.0 CM and a 2.0 CM on Different

Downstream Channel (Subcase 3) ..................................................................................................................... 856

Figure 275 - Multicast Session Replication to Clients Behind Both a 3.0 CM and a Hybrid CM w/ FC-Type 10

Support .............................................................................................................................................................. 857

Figure 276 - Multicast Session Replication to Clients Behind Two 3.0 CMs ........................................................... 858

Figure 277 - IGMP Support - CM Passive Mode ...................................................................................................... 859

Figure 278 - Adding a Channel to the TCS and making a Service Flow SID Cluster Assignment ........................... 864

Figure 279 - Changing the RCS and Downstream Resequencing Channel List ........................................................ 865

Figure 280 - DBC procedure for SF profile switch on OFDM channel ..................................................................... 866

Figure 281 - Example Combining Network 1 ............................................................................................................ 867

Figure 282 - Example Combining Network 2 ............................................................................................................ 868

Figure 283 - DPD Change to Profile A ...................................................................................................................... 870

Figure 284 - DPD Change to the NCP Profile ........................................................................................................... 871

List of Tables

Table 1 - DOCSIS 3.1 Series of Specifications ........................................................................................................... 25

Table 2 - DOCSIS 3.1 Related Specifications ............................................................................................................. 26

Table 3 - Example Node Configuration Table ............................................................................................................. 67

Table 4 - Example Topology Configuration Table ...................................................................................................... 68

Table 5 - Generic MAC Header Format ...................................................................................................................... 82

Table 6 - FC Field Format ........................................................................................................................................... 82

Table 7 - Packet PDU or Isolation Packet PDU MAC Frame Format ......................................................................... 84

Table 8 - MAC-Specific Headers and Frames ............................................................................................................. 85

Table 9 - Timing MAC Header Format ....................................................................................................................... 85

Table 10 - MAC Management Format ........................................................................................................................ 86

Table 11 - Request Frame (REQ) Format .................................................................................................................... 87

Table 12 - Fragmentation MAC Frame (FRAG) Format ............................................................................................. 88

Table 13 - Queue-depth Based Request Frame Format ............................................................................................... 89

Table 14 - Concatenated MAC Frame Format ............................................................................................................ 89

Table 15 - Example Extended Header Format ............................................................................................................. 91

Table 16 - EH Element Format .................................................................................................................................... 91

Table 17 - Extended Header Types.............................................................................................................................. 92

Table 18 - Fragmentation Extended Header Format .................................................................................................... 93

Table 19 - Unsolicited Grant Synchronization EHDR Sub-Element Format .............................................................. 93

Table 20 - BP_UP2 EHDR with Length 3 ................................................................................................................... 94

Table 21 - One-byte DS EHDR Sub-Element Format ................................................................................................. 94

Table 22 - Three-byte DS EHDR Sub-Element Format .............................................................................................. 94

Table 23 - Five-byte DS-EHDR Sub-Element Format ................................................................................................ 94

Table 24 - DPV Extended Header Format ................................................................................................................... 95

Table 25 - Segment Header Fields ............................................................................................................................... 96

Table 26 - MAC Management Message Types ........................................................................................................... 99

Table 27 - Linkage Between Channel Types ............................................................................................................. 102

CM-SP-MULPIv3.1-I20-200407 Data-Over-Cable Service Interface Specifications

20 CableLabs

04/07/20

Table 28 - Channel TLV Parameters ......................................................................................................................... 105

Table 29 - Upstream Physical-Layer Burst Attributes ............................................................................................... 112

Table 30 - Example UCD Channel Encodings for an OFDMA Channel .................................................................. 116

Table 31 - Example OFDMA Profile Encoding for Data IUC5 ................................................................................ 118

Table 32 - Allocation MAP Information Elements (IE) ............................................................................................ 121

Table 33 - Probe Information Element Definition ..................................................................................................... 124

Table 34 - CM Ranging Request Type Usage ........................................................................................................... 127

Table 35 - Capability Flags Encoding ....................................................................................................................... 132

Table 36 - Ranging Response Message Encodings with 1-byte Length Field ........................................................... 135

Table 37 - Ranging Response Message Encodings with 2-Byte Length Field .......................................................... 137

Table 38 - Commanded Power Sub-TLVs ................................................................................................................ 141

Table 39 - Field definitions for Downstream Active Channel List TLV ................................................................... 169

Table 40 - Sub-TLVs for Downstream Active Channel List TLV ............................................................................ 169

Table 41 - MAC Domain Downstream Service Group TLV ..................................................................................... 171

Table 42 - Sub-TLVs for MAC Domain Downstream Service Group TLV ............................................................. 171

Table 43 - Downstream Ambiguity Resolution Frequency List TLV ....................................................................... 172

Table 44 - Receive Channel Profile Reporting Control TLV .................................................................................... 173

Table 45 - Sub-TLVs for Receive Channel Profile Reporting Control TLV ............................................................. 173

Table 46 - IP Initialization Parameters TLV.............................................................................................................. 174

Table 47 - Sub-TLVs for IP Initialization Parameters TLV ...................................................................................... 174

Table 48 - Early Authentication and Encryption (EAE) Enable/Disable TLV .......................................................... 175

Table 49 - Field definitions for Active Upstream Channel List TLV ........................................................................ 175

Table 50 - Sub-TLVs for Active Upstream Channel List TLV ................................................................................. 175

Table 51 - Upstream Ambiguity Resolution Channel List TLV ................................................................................ 176

Table 52 - Upstream Frequency Range TLV ............................................................................................................. 176

Table 53 - Symbol Clock Locking Indicator TLV ..................................................................................................... 177

Table 54 - CM-STATUS Event Control TLV ........................................................................................................... 177

Table 55 - Upstream Transmit Power Reporting TLV .............................................................................................. 177

Table 56 - DSG DA-to-DSID Association Entry TLV .............................................................................................. 178

Table 57 - Sub-TLVs for DSG DA-to-DSID Association Entry TLV ...................................................................... 178

Table 58 - CM-STATUS Event Enable for Non-Channel-Specific Events TLV ...................................................... 178

Table 59 - Extended Upstream Transmit Power Support .......................................................................................... 179

Table 60 - CMTS DOCSIS Version TLV ................................................................................................................. 179

Table 61 - Sub-TLVs for CMTS DOCSIS Version TLV .......................................................................................... 179

Table 62 - CM Periodic Maintenance Timeout Indicator .......................................................................................... 180

Table 63 - DLS Broadcast and Multicast Delivery Method ...................................................................................... 180

Table 64 - CM-STATUS Event Enable for DOCSIS 3.1 Events TLV ...................................................................... 180

Table 65 - Diplexer Band Edge TLV......................................................................................................................... 181

Table 66 - DOCSIS Path Verify Request (DPV-REQ) Flags Field Bit Definitions .................................................. 186

Table 67 - CM-STATUS TLV Encodings ................................................................................................................. 188

Table 68 - CM-CTRL-REQ TLV Encodings ............................................................................................................ 190

Table 69 - Parameters Carried by the OCD ............................................................................................................... 195

Table 70 - Subcarrier Assignment List/Range TLV .................................................................................................. 197

Table 71 - Subcarrier Assignment Vector TLV ......................................................................................................... 198

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DOCSIS 3.1协议详解：CM-SP-MULPIv3.1-I20-200407

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