中 华 人 民 共 和 国 通 信 行 业 标 准 25Gbit/s和50Gbit/s光传送网（ OTN）接 口技术要求 Technical requirements of 25Gbit/s and 50Gbit/s Optical Transport Network (OTN) interfaces （报批稿） ICS 33.040.20 CCS M 33 YD YD/T XXXX—XXXX XXXX- - XX - XX发布 XXXX - XX - XX实施 中华人民共和国工业和信息化部 发 布 II目 次 前 言 ............................................................................... IV 1 范围 ................................................................................ 5 2 规范性引用文件 ...................................................................... 5 3 术语和定义 .......................................................................... 5 4 缩略语 .............................................................................. 5 5 25GBIT/S 和50GBIT/S OTN接口概述 .................................................... 6 6 OTU25(U) 和OTU50(U) 技术要求 ......................................................... 7 6.1 数字结构 ..................................................................................................................................................... 7 6.2 复用结构 ..................................................................................................................................................... 7 6.3 比特率 ......................................................................................................................................................... 8 6.4 时分复用 ................................................................................................................................................... 11 6.5 帧结构和开销 ........................................................................................................................................... 13 7 OTU25-RS 接口技术要求 .............................................................. 13 7.1 基本信号结构 ........................................................................................................................................... 13 7.2 帧结构 ....................................................................................................................................................... 14 7.3 比特率和帧周期 ....................................................................................................................................... 15 7.4 开销 ............................................................................................................................................................ 15 7.5 加扰 ............................................................................................................................................................ 15 7.6 前向误码纠错（ FEC） ............................................................................................................................ 15 7.7 接口格式 ................................................................................................................................................... 16 8 OTU50-RS 接口技术要求 .............................................................. 16 8.1 基本信号结构 ........................................................................................................................................... 16 8.2 帧结构 ....................................................................................................................................................... 16 8.3 比特率和帧周期 ....................................................................................................................................... 17 8.4 开销 ............................................................................................................................................................ 17 8.5 加扰 ............................................................................................................................................................ 18 8.6 前向误码纠错（ FEC） ............................................................................................................................ 18 8.7 接口格式 ...........