1、I摘要隨著通信業(yè)務(wù)的發(fā)展，數(shù)據(jù)通信也有了新的進(jìn)步，其主要表現(xiàn)在應(yīng)用種類的增加，寬帶使用率的急速上升，這使得廊坊市現(xiàn)有的傳輸網(wǎng)絡(luò)無(wú)法適應(yīng)這種需求，為更好的滿足人們的需要，必須有一新的技術(shù)代替原有的技術(shù)，實(shí)現(xiàn)網(wǎng)絡(luò)的互聯(lián)。美國(guó)貝爾實(shí)驗(yàn)室提出了SDH并逐步成為當(dāng)今世界通信領(lǐng)域在傳輸技術(shù)方面的一個(gè)發(fā)展熱點(diǎn)，SDH的出現(xiàn)完全改變了光通信的接入方式。本文是以廊坊為例，通過(guò)調(diào)查廊坊市傳輸網(wǎng)現(xiàn)在的情況，又結(jié)合了SDH新技術(shù)，從而提出了網(wǎng)絡(luò)傳輸?shù)母慕ǚ桨福?/p>

2、此方案中通過(guò)增加網(wǎng)絡(luò)站點(diǎn)、改造網(wǎng)絡(luò)傳輸方式等，對(duì)現(xiàn)有網(wǎng)絡(luò)進(jìn)行優(yōu)化與擴(kuò)充，并考慮了網(wǎng)絡(luò)的保護(hù)及同步方式，進(jìn)而提高網(wǎng)絡(luò)傳輸?shù)目煽啃?。關(guān)鍵詞：SDH；設(shè)備；網(wǎng)絡(luò)結(jié)構(gòu)；擴(kuò)容；復(fù)用段保護(hù)；通道保護(hù)ABSTRACTAlongwiththedevelopmentofcommunicationservicesdatacommunicationhavethenewprogressintheapplicationthemainperfmancethenum

3、berofcategiesofthebroadbadoptionrapidlyincreasewhichmakesBeijingdaxingdistrictexistingtransmissionwkcantadapttothisdemtobettersatisfypeoplesneedstheremustbeanewtechnologyinsteadoftheiginaltechnologytorealizewkinterconnec

4、tion.AmericanbellLABSproposesSDHgraduallybecomecommunicationsfieldinthewldtodayintransmissiontechnologyadevelopmenttheemergenceofSDHhotcompletelychangedtheaccesswayoptical.ThispaperinBeijingsdaxingdistrictasanexamplethro

5、ughinvestigationoftransmissiondaxingdistrictnownewtechnologycombiningSDHwktransmissionthusputsfwardtherebuildingschemethisplanbyaddingwebsitethetransfmationwktransmissionmodeetctooptimizetheexistingwkconsiderexpedthewksp

6、rotectionsynchronouswaysoastoimprovethereliabilityofthewktransmission.Keywds:SDHequipmentwkstructuredilatation；MSPPPIII4.2.1鏈網(wǎng)改造環(huán)網(wǎng)..........................................................................................

7、..................................194.2.2單向通道環(huán)改雙向復(fù)用段環(huán)............................................................................................224.2.3復(fù)用段環(huán)加新站點(diǎn)擴(kuò)容..........................................................

8、............................................244.2.4擴(kuò)容后的網(wǎng)絡(luò)............................................................................................................................295SDH網(wǎng)絡(luò)同步原理……………………………………………………….325.1

9、網(wǎng)絡(luò)同步的必要性............................................325.2SDH同步定時(shí).............................................325.3SDH網(wǎng)絡(luò)的定時(shí)方式........................................335.4SDH網(wǎng)絡(luò)同步定時(shí)分配結(jié)構(gòu)..................................345.

10、5SDH網(wǎng)絡(luò)同步方式.............................................365.6SDH網(wǎng)同步基準(zhǔn)信號(hào)的分配及傳送原則...........................365.7廊坊SDH網(wǎng)絡(luò)同步方式........................................376方案的評(píng)估與論證…………….…………………………………………38致謝：………………………………………………………