【正文】 浙江大學(xué)碩士學(xué)位論文 摘要 i 針對(duì) SDH 傳輸網(wǎng)絡(luò)長(zhǎng)支鏈的優(yōu)化研究 摘要 溫州移動(dòng)本地傳輸網(wǎng)從 2021 年開(kāi)始自建，經(jīng)歷了一個(gè)從完全租用到 %的翻天覆地的變化過(guò)程。溫州地區(qū)環(huán)境復(fù)雜，在本地傳輸網(wǎng)建設(shè)的過(guò)程中形成了較多的長(zhǎng)支鏈，存在嚴(yán)重的安全隱患 。 隨著移動(dòng)通信業(yè)務(wù)量在不斷提升， 2021 年建設(shè)規(guī)模更是空前巨大 。同時(shí)用戶對(duì)所提供業(yè)務(wù)可靠性的要求也大幅提高，加上溫州地區(qū)復(fù)雜的地形情況、普遍發(fā)達(dá)的鄉(xiāng)鎮(zhèn)經(jīng)濟(jì)圈、夏季臺(tái)風(fēng)洪水災(zāi)害頻繁等因素，本著建設(shè)適合溫州傳輸線路現(xiàn)狀且安全可靠的傳輸網(wǎng)絡(luò)的原則，形成穩(wěn)定可靠的接入層網(wǎng)絡(luò)。 本文 給出了多 種 SDH 傳輸網(wǎng)優(yōu)化方案和新增長(zhǎng)支鏈的流程控制方法，實(shí)施現(xiàn)網(wǎng)長(zhǎng)支鏈改造，減少現(xiàn)網(wǎng)長(zhǎng)支鏈數(shù)量，同時(shí)在基站傳輸建設(shè)過(guò)程中引入一系列控制措施，建立一整套長(zhǎng)支鏈控制機(jī)制，嚴(yán)格且有效地控制新增長(zhǎng)支鏈，形成良性循環(huán)，力求逐步降低支鏈節(jié)點(diǎn)數(shù)，提高成環(huán)率，形成穩(wěn)定可靠的接入層網(wǎng)絡(luò)。 通過(guò)此項(xiàng)目，溫州本地傳輸網(wǎng)組網(wǎng)的安全性、穩(wěn)定性及可擴(kuò)展性得到了增強(qiáng)，保障了網(wǎng)絡(luò)安全，同時(shí)也為今后本地網(wǎng)的建設(shè)和維護(hù)提供了可供借鑒的方案。 關(guān)鍵詞： SDH， 長(zhǎng)支鏈，傳輸網(wǎng) 浙江大學(xué)碩士學(xué)位論文 Abstract ii Abstract Wenzhou mobile local transmission work built since 2021, has gone through a lease from the full percent of the earthshaking changes in the process. Wenzhou, the plexity of the local environment, the local transmission work in the process of building a more longbranchedchain, there are serious security risks. With the mobile munications business in the everincreasing scale of construction in 2021 is unprecedented. At the same time, business users of the reliability provided by a substantial increase in the requirements, together with the Wenzhou region39。s plex terrain, the generally welldeveloped economic zone of the township, the frequent floods in the summer of typhoons and other factors, inbuilding transmission lines for the status quo in Wenzhou and the safe and reliable the principle of the transmission work to form a stable and reliable work access layer. This item is given a wide range of SDH transmission work optimization 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(xué)碩士學(xué)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(fù)用方式 ........................................................................... 3 運(yùn)行維護(hù)方面 ................................................................... 4 沒(méi)有統(tǒng)一的網(wǎng)管接口 ....................................................... 4 SDH 的優(yōu)點(diǎn) ...................................................................... 5 傳輸支鏈 ........................................................................... 5 研究意義 .................................................................................... 6 研究?jī)?nèi)容 .................................................................................... 6 論文組織結(jié)構(gòu) ............................................................................ 7 本人負(fù)責(zé)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(hù)機(jī)理 ................................................ 8 基本的網(wǎng)絡(luò)拓?fù)浣Y(jié)構(gòu) ................................................................. 8 業(yè)務(wù)分類(lèi) .................................................................................... 9 鏈形網(wǎng) .......................................................................................10 環(huán)網(wǎng) —— 自愈環(huán) ........................................................................10 浙江大學(xué)碩士學(xué)位論文 目錄 II 自愈的概念 ......................................................................10 自愈環(huán)的分類(lèi) .................................................................. 11 二纖單向通道保護(hù)環(huán) ...................................................... 11 二纖雙向通道保護(hù)環(huán) ......................................................13 二纖單向復(fù)用段環(huán) ..........................................................13 四纖雙向復(fù)用段保 護(hù)環(huán) ..................................................15 雙纖雙向復(fù)用段保護(hù)環(huán) —— 雙纖共享復(fù)用段保護(hù)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(diǎn)及存在問(wèn)題 ...................................22 目前溫州移動(dòng)傳輸網(wǎng)特點(diǎn) ........................................................22 目前溫州移動(dòng)傳輸網(wǎng)存在的問(wèn)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(kuò)展性方面 ..........................................................23 優(yōu)化的必要性 ...........................................................................23 溫州網(wǎng)絡(luò)運(yùn)行情況 ....................................................................23 基站退服原因分類(lèi) ....................................................................24 本章小結(jié) ...................................................................................25 第 4 章