1 Scope 11
2 References 11
3 Terms and definitions 12
4 Abbreviations 14
5 Conventions 17
6 Optical transport network interface structure 18
6.1 Basic signal structure 19
6.1.1 OCh substructure 19
6.1.2 Full functionality OTM n.m (n ≥ 1) structure 19
6.1.3 Reduced functionality OTM nr.m and OTM 0.m structure 20
6.2 Information structure for the OTN interfaces 20
7 Multiplexing/mapping principles and bit rates 24
7.1 Mapping 26
7.2 Wavelength division multiplex 27
7.3 Bit rates and capacity 27
7.4 ODUk Time Division Multiplex 28
8 Optical transport module (OTM n.m, OTM nr.m, OTM 0.m) 30
8.1 OTM with reduced functionality (OTM 0.m, OTM nr.m, OTM-0v.m) 30
8.1.1 OTM 0.m 31
8.1.2 OTM nr.m 31
8.1.2.1 OTM 16r.m 31
8.1.2.2 OTM 32r.m 33
8.1.3 OTM 0v.m Error! Bookmark not defined.
8.2 OTM with full functionality (OTM n.m) 35
9 Physical specification of the ONNI 37
9.1 OTM 0.m 37
9.2 OTM nr.m 37
9.2.1 OTM 16r.m 37
9.2.2 OTM 32r.m 37
9.3 OTM n.m 37
9.3 OTM 0v.m Error! Bookmark not defined.
10 Optical channel (OCh) 37
10.1 OCh with full functionality (OCh) 37
10.2 OCh with reduced functionality (OChr) 38
11 Optical channel transport unit (OTU) 38
11.1 OTUk frame structure 38
11.2 Scrambling 40
12 Optical channel data unit (ODUk) 40
12.1 ODUk frame structure 40
13 Optical channel payload unit (OPUk) 41
14 OTM overhead signal (OOS) 41
15 Overhead description 41
15.1 Types of overhead 43
15.1.1 Optical channel payload unit overhead (OPUk OH) 43
15.1.2 Optical channel data unit overhead (ODUk OH) 43
15.1.3 Optical channel transport unit overhead (OTUk OH) 44
15.1.4 Optical channel non-associated overhead (OCh OH) 44
15.1.5 Optical multiplex section overhead (OMS OH) 44
15.1.6 Optical transmission section overhead (OTS OH) 44
15.1.7 General management communications overhead (COMMS OH) 44
15.2 Trail trace identifier and access point identifier definition 44
15.3 OTS OH description 46
15.3.1 OTS trail trace identifier (TTI) 46
15.3.2 OTS backward defect indication – Payload (BDI-P) 46
15.3.3 OTS backward defect indication – Overhead (BDI-O) 46
15.3.4 OTS payload missing indication (PMI) 46
15.4 OMS OH description 47
15.4.1 OMS forward defect indication – Payload (FDI-P) 47
15.4.2 OMS forward defect indication – Overhead (FDI-O) 47
15.4.3 OMS backward defect indication – Payload (BDI-P) 47
15.4.4 OMS backward defect indication – Overhead (BDI-O) 47
15.4.5 OMS payload missing indication (PMI) 47
15.5 OCh OH description 47
15.5.1 OCh forward defect indication – Payload (FDI-P) 47
15.5.2 OCh forward defect indication – Overhead (FDI-O) 47
15.5.3 OCh open connection indication (OCI) 47
15.6 OTUk/ODUk frame alignment OH description 48
15.6.1 OTUk/ODUk frame alignment overhead location 48
15.6.2 OTUk/ODUk frame alignment overhead definition 48
15.6.2.1 Frame alignment signal (FAS) 48
15.6.2.2 Multiframe alignment signal (MFAS) 48
15.7 OTUk OH description 49
15.7.1 OTUk overhead location 49
15.7.2 OTUk overhead definition 50
15.7.2.1 OTUk section monitoring (SM) overhead 50
15.7.2.1.1 OTUk SM trail trace identifier (TTI) 50
15.7.2.1.2 OTUk SM error detection code (BIP-8) 50
15.7.2.1.3 OTUk SM backward defect indication (BDI) 51
15.7.2.1.4 OTUk SM backward error indication and backward incoming alignment error (BEI/BIAE) 51
15.7.2.1.5 OTUk SM incoming alignment error overhead (IAE) 52
15.7.2.1.6 OTUk SM reserved overhead (RES) 52
15.7.2.2 OTUk general communication channel 0 (GCC0) 52
15.7.2.3 OTUk reserved overhead (RES) 52
15.7.3 OTUkV overhead 52
15.8 ODUk OH description 53
15.8.1 ODUk OH location 53
15.8.2 ODUk OH definition 54
15.8.2.1 ODUk path monitoring (PM) overhead 54
15.8.2.1.1 ODUk PM trail trace identifier (TTI) 54
15.8.2.1.2 ODUk PM error detection code (BIP-8) 54
15.8.2.1.3 ODUk PM backward defect indication (BDI) 55
15.8.2.1.4 ODUk PM backward error indication (BEI) 55
15.8.2.1.5 ODUk PM status (STAT) 56
15.8.2.2 ODUk tandem connection monitoring (TCM) overhead 56
15.8.2.2.1 ODUk TCM trail trace identifier (TTI) 58
15.8.2.2.2 ODUk TCM error detection code (BIP-8) 59
15.8.2.2.3 ODUk TCM backward defect indication (BDI) 59
15.8.2.2.4 ODUk TCM backward error indication (BEI) and backward incoming alignment error (BIAE) 59
15.8.2.2.5 ODUk TCM status (STAT) 60
15.8.2.2.6 TCM overhead field assignment 61
15.8.2.2.7 ODUk tandem connection monitoring activation/deactivation coordination protocol 62
15.8.2.3 ODUk general communication channels (GCC1, GCC2) 62
15.8.2.4 ODUk automatic protection switching and protection communication channel (APS/PCC) 62
15.8.2.5 ODUk fault type and fault location reporting communication channel (FTFL) 63
15.8.2.5.1 Forward/backward fault type indication field 63
15.8.2.5.2 Forward/backward operator identifier field 64
15.8.2.5.3 Forward/backward operator specific field 65
15.8.2.6 ODUk experimental overhead (EXP) 65
15.8.2.7 ODUk reserved overhead (RES) 65
15.9 OPUk OH description 65
15.9.1 OPUk OH location 65
15.9.2 OPUk OH definition 66
15.9.2.1 OPUk payload structure identifier (PSI) 66
15.9.2.1.1 OPUk payload type (PT) 66
15.9.2.2 OPUk mapping specific overhead 67
16 Maintenance signals 67
16.1 OTS maintenance signals 68
16.1.1 OTS payload missing indication (OTS-PMI) 68
16.2 OMS maintenance signals 68
16.2.1 OMS forward defect indication – Payload (OMS-FDI-P) 68
16.2.2 OMS forward defect indication – Overhead (OMS-FDI-O) 68
16.2.3 OMS payload missing indication (OMS-PMI) 68
16.3 OCh maintenance signals 68
16.3.1 OCh forward defect indication – Payload (OCh-FDI-P) 68
16.3.2 OCh forward defect indication – Overhead (OCh-FDI-O) 68
16.3.3 OCh open connection indication (OCh-OCI) 68
16.4 OTUk maintenance signals 68
16.4.1 OTUk alarm indication signal (OTUk-AIS) 68
16.5 ODUk maintenance signals 69
16.5.1 ODUk alarm indication signal (ODUk-AIS) 69
16.5.2 ODUk open connection indication (ODUk-OCI) 69
16.5.3 ODUk locked (ODUk-LCK) 70
16.6 Client maintenance signal 71
16.6.1 Generic AIS for constant bit rate signals 71
17 Mapping of client signals 72
17.1 Mapping of CBR2G5, CBR10G, CBR10G3 and CBR40G signals (e.g., STM-16/64/256, 10GBASE-R) into OPUk 72
17.1.1 Mapping a CBR2G5 signal (e.g., STM-16) into OPU1 74
17.1.2 Mapping a CBR10G signal (e.g., STM-64) into OPU2 75
17.1.3 Mapping a CBR40G signal (e.g. STM-256) into OPU3 75
17.1.4 Mapping a CBR10G3125 signal (e.g., 10GBASE-xR) into OPU2e 76
17.2 Mapping of ATM cell stream into OPUk 76
17.3 Mapping of GFP frames into OPUk 77
17.4 Mapping of test signal into OPUk 78
17.4.1 Mapping of a NULL client into OPUk 78
17.4.2 Mapping of PRBS test signal into OPUk 78
17.5 Mapping of a non-specific client bit stream into OPUk 79
17.5.1 Mapping bit stream with octet timing into OPUk 80
17.5.2 Mapping bit stream without octet timing into OPUk 80
17.6 Mapping of other constant bit-rate signals with justification into OPUk 80
17.7 Mapping a 1000BASE-X and FC-1200 signal via timing transparent transcoding into OPUk 80
17.7.1 Mapping a 1000BASE-X signal into OPU0 81
17.7.2 Mapping a FC-1200 signal into OPU2e 88
18 Concatenation 88
18.1 Virtual concatenation of OPUk 91
18.1.1 Virtual concatenated OPUk (OPUk-Xv, k = 1 .. 3, X = 1 .. 256) 91
18.1.2 OPUk-Xv OH description 92
18.1.2.1 OPUk-Xv OH location 92
18.1.2.2 OPUk-Xv OH definition 93
18.1.2.2.1 OPUk-Xv Payload Structure Identifier (PSI) 93
18.1.2.2.1.1 OPUk-Xv Payload Type (vcPT) 93
18.1.2.2.1.2 OPUk-Xv Payload Structure Identifier Reserved overhead (RES) 94
18.1.2.2.2 OPUk-Xv Virtual Concatenation Overhead (VCOH1/2/3) 94
18.1.2.2.2.1 OPUk-Xv Virtual Concatenation MultiFrame Indicator (MFI1, MFI2) 94
18.1.2.2.2.2 OPUk-Xv Sequence Indicator (SQ) 95
18.1.2.2.2.3 OPUk-Xv LCAS Control Words (CTRL) 95
18.1.2.2.2.4 OPUk-Xv LCAS Member Status Field (MST) 95
18.1.2.2.2.5 OPUk-Xv LCAS Group Identification (GID) 95
18.1.2.2.2.6 OPUk-Xv LCAS Re-Sequence Acknowledge (RS-Ack) 95
18.1.2.2.2.7 OPUk-Xv LCAS Cyclic Redundancy Check (CRC) 96
18.1.2.2.2.8 OPUk-Xv VCOH Reserved Overhead 96
18.1.2.2.3 OPUk Mapping Specific Overhead 96
18.2 Mapping of client signals 96
18.2.1 Mapping of CBR signals (e.g., STM-64/256) into OPUk-4v 96
18.2.1.1 Mapping a CBR10G signal (e.g. STM-64) into OPU1-4v 97
18.2.1.2 Mapping a CBR40G signal (e.g. STM-256) into OPU2-4v 98
18.2.2 Mapping of CBR signals (e.g., STM-256) into OPUk-16v 98
18.2.2.1 Mapping a CBR40G signal (e.g., STM-256) into OPU1-16v 100
18.2.3 Mapping of ATM cell stream into OPUk-Xv 101
18.2.4 Mapping of GFP frames into OPUk-Xv 102
18.2.5 Mapping of test signal into OPUk-Xv 102
18.2.5.1 Mapping of a NULL client into OPUk-Xv 102
18.2.5.2 Mapping of PRBS test signal into OPUk-Xv 103
18.2.6 Mapping of a non-specific client bit stream into OPUk-Xv 104
18.2.6.1 Mapping bit stream with octet timing into OPUk-Xv 105
18.2.6.2 Mapping bit stream without octet timing into OPUk-Xv 105
18.3 LCAS for virtual concatenation 105
19 Mapping ODUj signals into the ODTUjk and ODTU? signals 105
19.1 OPUk Tributary Slot definition 105
19.1.1 OPU2 Tributary Slot allocation 106
19.1.2 OPU3 Tributary Slot allocation 107
19.1.3 OPU4 Tributary Slot allocation 110
19.1.4 OPU1 Tributary Slot allocation 109
19.2 ODTUjk and ODTU? definitions 110
19.2.1 ODTU12 110
19.2.2 ODTU13 110
19.2.3 ODTU23 110
19.2.7 ODTU01 110
19.2.8 ODTU? Error! Bookmark not defined.
19.3 Multiplexing ODTUjk and ODTU? signals into the OPUk 111
19.3.1 ODTU12 mapping into one OPU2 2.5G Tributary Slot 111
19.3.2 ODTU13 mapping into one OPU3 2.5G Tributary Slot 112
19.3.3 ODTU23 mapping into four OPU3 2.5G Tributary Slots 113
19.3.4 ODTU01 mapping into one OPU1 1.25G Tributary Slot 114
19.4 OPUk Multiplex Overhead 115
19.4.1 OPUk Multiplex Structure Identifier (MSI) 118
19.4.1.1 OPU2 Multiplex Structure Identifier (MSI) 119
19.4.1.2 OPU3 Multiplex Structure Identifier (MSI) 119
19.4.1.3 OPU4 Multiplex Structure Identifier (MSI) 120
19.4.1.4 OPU1 Multiplex Structure Identifier (MSI) Error! Bookmark not defined.
19.4.2 OPUk Payload Structure Identifier Reserved overhead (RES) 120
19.4.3 OPUk Multiplex Justification Overhead (JOH) 121
19.4.3.1 Asynchronous Mapping Procedure Error! Bookmark not defined.
19.4.3.2 Asynchronous Generic Mapping Procedure Error! Bookmark not defined.
19.4.4 OPU4 Multi Frame Identifier overhead (OMFI) 121
19.5 Mapping ODUj into ODTUjk 121
19.5.1 Mapping ODU1 into ODTU12 122
19.5.2 Mapping ODU1 into ODTU13 123
19.5.3 Mapping ODU2 into ODTU23 124
19.5.4 Mapping ODU0 into ODTU01 126
ODU0 into OPUk Tributary Slot Mapping Error! Bookmark not defined.
19.6 Mapping ODUj into ODTU
2025-12-25 16:30:53
1.88MB
1
1 Scope 11
2 References 11
3 Terms and definitions 12
4 Abbreviations 14
5 Conventions 17
6 Optical transport network interface structure 18
6.1 Basic signal structure 19
6.1.1 OCh substructure 19
6.1.2 Full functionality OTM n.m (n ≥ 1) structure 19
6.1.3 Reduced functionality OTM nr.m and OTM 0.m structure 20
6.2 Information structure for the OTN interfaces 20
7 Multiplexing/mapping principles and bit rates 24
7.1 Mapping 26
7.2 Wavelength division multiplex 27
7.3 Bit rates and capacity 27
《OTN G.709协议T-REC-G.709-202202-I!Amd2!PDF-EOTN光通信协议》是国际电信联盟(ITU-T)发布的一份标准文档，主要关注光传输网络(OTN)的接口结构和技术规范。OTN是一种用于承载大量数据、语音和视频服务的高效光传输平台，广泛应用于长途和城域通信网络。
该协议详细定义了OTN接口的各个方面，包括但不限于以下几个关键知识点：
1. **范围**：文档规定了OTN光通信网络的接口结构和功能，适用于在不同层次之间进行数据传输的设备和系统，确保网络的互操作性和兼容性。
2. **参考文献和术语定义**：这些章节提供了解释和理解标准所必需的基础知识，包括引用的标准、专业术语以及缩写词，为后续章节提供了清晰的背景和语言框架。
3. **缩略语**：列举并解释了协议中使用的各种专业术语和缩略语，如OTM（Optical Transport Module）等，便于读者理解和应用。
4. **约定**：这部分详细说明了在OTN网络设计和实现中遵循的规则和标准，确保所有参与者都遵循统一的规程。
5. **OTN接口结构**：OTN接口结构包括基本信号结构、信息结构和复用映射原则。其中：
- **基本信号结构**：定义了OTN的基础信号单元，如OCh（Optical Channel）子结构。
- **全功能OTM n.m结构**（n ≥ 1）：涵盖了完整的OTM结构，包括多路复用和映射的高级功能。
- **减少功能的OTM nr.m和OTM 0.m结构**：针对特定场景或简化版的OTN接口。
6. **信息结构与OTN接口**：详细阐述了OTN接口如何组织和传输信息，包括信息帧的格式、结构和编码方式。
7. **复用/映射原理和比特率**：这部分描述了OTN中不同类型的映射（如SDH、PDH到OTN的映射）以及波分复用（WDM）技术，WDM允许在单根光纤上同时传输多个光载波，极大地增加了带宽利用率。
8. **比特率和容量**：规定了OTN网络中的比特率标准，以及不同级别的OTM信号所能承载的容量，这对于规划和设计网络容量至关重要。
9. **互联网协议方面**：虽然主要关注光传输，但G.709协议也考虑了与互联网协议的交互，特别是对于下一代网络(NGN)、物联网(IoT)和智慧城市的相关接口。
G.709协议是OTN网络设计、部署和维护的基石，它规定了光通道层的操作，确保了跨多个网络节点的高效透明传输，同时支持灵活的带宽管理和服务质量(QoS)控制。通过遵循这一标准，电信运营商能够构建出高可靠、高容量且易于管理的光传输基础设施。
2025-08-12 20:22:02
6.08MB
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ITU-T 建议标准 G.709（光传输网络接口）的综合概述，该标准目的在于解决现今的多业务传输需求。
2022-04-02 11:17:19
1.02MB
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ITU-T-G.709中文版 OTN接口
ITU-T-G.709中文版 OTN接口
ITU-T-G.709中文版 OTN接口
需要的自行下载
2021-09-16 10:12:05
8.04MB
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