【正文】 ................................................................. 13 . 分組傳送網(wǎng)（ PTN）網(wǎng)元的功能結(jié)構(gòu) .................................................................................................... 14 . 分組傳送 網(wǎng)（ PTN）的組網(wǎng)拓撲 ....................................................................................................................... 15 5. PTN 的分組轉(zhuǎn)發(fā)和多業(yè)務(wù)承載技術(shù)要求 ................................................................................................................ 15 . PTN 的分組轉(zhuǎn)發(fā)功能要求 .................................................................................................................................... 15 . PTN 的多業(yè)務(wù)承載架構(gòu) ......................................................................................................................................... 16 . 基于 PW 的仿真業(yè)務(wù)要求 ..................................................................................................................................... 17 . 基于 PW 的仿真業(yè)務(wù)總體要求 .................................................................................................................. 17 . TDM 業(yè)務(wù)接入要求 ....................................................................................................................................... 18 . 以太網(wǎng)二層業(yè)務(wù)接入要求（簡化） ........................................................................................................ 22 . ATM 業(yè)務(wù)接入要求（可選） ..................................................................................................................... 26 . IP/MPLS 業(yè)務(wù)接入要求（可選） ....................................................................................................................... 28 . IP/MPLS 業(yè)務(wù)接入的總體要求 ................................................................................................................. 28 . IP/MPLS 業(yè)務(wù)的封裝要求 ........................................................................................................................... 28 . 基本 IP 協(xié)議要求 ........................................................................................................................................... 28 . PTN 的 L3VPN 基本要求 ............................................................................................................................. 29 . 靜態(tài) L3VPN 要求 ........................................................................................................................................... 30 . 動態(tài) L3VPN 要求 ........................................................................................................................................... 30 6. PTN 網(wǎng)絡(luò)保護技術(shù)要求 ................................................................................................................................................. 31 . PTN 保護方式分類 .................................................................................................................................................. 31 . PTN 保護的通用功能要求 .................................................................................................................................... 31 . PTN 網(wǎng)絡(luò)的線性保護技術(shù)要求 ........................................................................................................................... 32 . 線性保護功能要求 ......................................................................................................................................... 32 . 線性保護自動倒換（ APS 協(xié)議） ............................................................................................................. 32 . 1+1 線性保護 .................................................................................................................................................. 33 . 1： 1 線性保護 ................................................................................................................................................. 35 . 1： N（ N1）線性保護（可選） ............................................................................................................. 36 . PTN 網(wǎng)絡(luò)的環(huán)網(wǎng)保護技術(shù)要求 ........................................................................................................................... 37 . PTN 的環(huán)網(wǎng)保護功能要求 .......................................................................................................................... 37 . MPLSTP 的環(huán)網(wǎng)保護功能要求 ................................................................................................................ 37 . PTN 接入鏈路保護技術(shù)要求 ................................................................................................................................ 41 . STMN 接入鏈路保護 ................................................................................................................................... 41 . 以太網(wǎng)接入鏈路保護 .................................................................................................................................... 41 . 雙歸保護 ...................................................................................................................................................................... 42 7. PTN 網(wǎng)絡(luò)的 OAM 技術(shù)要求 ........................................................................................................................................ 43 . PTN 網(wǎng)絡(luò)的 OAM 架構(gòu) .......................................................................................................................................... 43 . PTN 網(wǎng)絡(luò)內(nèi) OAM .................................................................................................................................................... 44 . PTN 網(wǎng)絡(luò)內(nèi) OAM 功能要求 ....................................................................................................................... 44 . PTN 網(wǎng)絡(luò)內(nèi) OAM PDU 格式定義 ............................................................................................................ 48 . PTN 網(wǎng)絡(luò)業(yè)務(wù)層 OAM ........................................................................................................................................... 51 . 以太網(wǎng)業(yè)務(wù) OAM .....