【正文】 tion program and the methods of branchedchain growth in the course of the introduction of basebuilding measures to control the formation of long branchedchain to Reduce the longbranchedchain, to improve the rate of cyclization to form a stable and reliable work access layer. Through this project, Wenzhou, the local transmission work security, stability and scalability has been enhanced to protect the work security. Keywords： SDH, long branchedchain, transmission work 浙江大學碩士學位論文 目錄 I 目錄 摘要 .......................................................................................................... i Abstract .................................................................................................... ii 圖目錄 ......................................................................................................V 表目錄 ................................................................................................... VII 第 1 章 緒論 ............................................................................................ 1 課題背景 .................................................................................... 1 基本概念解釋 ............................................................................ 1 什么是 SDH？ .................................................................. 1 復用方式 ........................................................................... 3 運行維護方面 ................................................................... 4 沒有統(tǒng)一的網(wǎng)管接口 ....................................................... 4 SDH 的優(yōu)點 ...................................................................... 5 傳輸支鏈 ........................................................................... 5 研究意義 .................................................................................... 6 研究內(nèi)容 .................................................................................... 6 論文組織結(jié)構(gòu) ............................................................................ 7 本人負責工作 ............................................................................ 7 本章小結(jié) .................................................................................... 7 第 2 章 SDH 網(wǎng)絡(luò)結(jié)構(gòu)和網(wǎng)絡(luò)保護機理 ................................................ 8 基本的網(wǎng)絡(luò)拓撲結(jié)構(gòu) ................................................................. 8 業(yè)務(wù)分類 .................................................................................... 9 鏈形網(wǎng) .......................................................................................10 環(huán)網(wǎng) —— 自愈環(huán) ........................................................................10 浙江大學碩士學位論文 目錄 II 自愈的概念 ......................................................................10 自愈環(huán)的分類 .................................................................. 11 二纖單向通道保護環(huán) ...................................................... 11 二纖雙向通道保護環(huán) ......................................................13 二纖單向復用段環(huán) ..........................................................13 四纖雙向復用段保 護環(huán) ..................................................15 雙纖雙向復用段保護環(huán) —— 雙纖共享復用段保護環(huán) ....17 兩種自愈環(huán)的比較 ..........................................................19 SDH 網(wǎng) 絡(luò)的整體層次結(jié)構(gòu) ........................................................19 本章小結(jié) ...................................................................................21 第 3 章 溫州地區(qū) SDH 傳輸網(wǎng)特點及存在問題 ...................................22 目前溫州移動傳輸網(wǎng)特點 ........................................................22 目前溫州移動傳輸網(wǎng)存在的問題 ............................................22 網(wǎng)絡(luò)的可靠性方面 ..........................................................22 網(wǎng)絡(luò)的高效性方面 ..........................................................22 網(wǎng)絡(luò)的可控性方面 ..........................................................23 網(wǎng)絡(luò)的擴展性方面 ..........................................................23 優(yōu)化的必要性 ...........................................................................23 溫州網(wǎng)絡(luò)運行情況 ....................................................................23 基站退服原因分類 ....................................................................24 本章小結(jié) ...................................................................................25 第 4 章 現(xiàn)狀調(diào)查及設(shè)定目標 ................................................................27 浙江省內(nèi)長支鏈數(shù)量對比 ........................................................27 不同設(shè)備廠家長支鏈數(shù)量對比 ................................................27 溫州地區(qū)長支鏈數(shù)量對比 ........................................................28 溫州各縣市長支鏈數(shù)量對比 ....................................................29 浙江大學碩士學位論文 目錄 III 長支鏈分類統(tǒng)計 ........................................................................29 目標設(shè)定及依據(jù) ........................................................................30 本章小結(jié) ...................................................................................32 第 5 章 原因分析 ...................................................................................33 分析關(guān)聯(lián) ...................................................................................33 確定主要原因 ...........................................................................33 主要原因確認過程 ....................................................................34 缺少長支鏈改造方案 ......................................................35 人員配置不足 ..................................................................35 未制定長支鏈改造流程和考核標準 ...............................37 新站接入控制流程不完善 ..............................................37 匯聚點選址規(guī)劃不充分 ..................................................38 匯聚設(shè)備沒有及時替換 ..................................................39 老型 SDH 接入設(shè)備占比高 ............................................40 傳輸成環(huán)方案單一 ..........................................................41 主要原因確認結(jié)果 ....................................................................42 本章小結(jié) ..............