Nkag siab txog SDH hauv ntau yam

SDH --- Synchronous Digital Hierarchy yog cov kev teeb tsa cov qauv hluav taws xob cov qauv txheej txheem uas tuaj yeem siv rau cov ntaub ntawv xov xwm xa mus, sib txuam, sib txuam thiab ntxiv thiab hla sib txuas. Nws tuaj yeem xa cov cim synchronous ntawm kev xa xov xwm (xws li fiber ntau kho qhov muag, microwave, thiab lwm yam).

SDH optical kis tau cov cuab yeej tuaj yeem paub txog ntau txoj haujlwm, xws li kev tswj hwm network zoo, kev soj ntsuam kev lag luam tiag tiag, kev saib xyuas kev nyab xeeb network, kev sib txuas ntawm cov tuam txhab sib txawv' cov cuab yeej siv, thiab lwm yam nws tuaj yeem txhim kho kev siv ntawm cov peev txheej hauv network, txo cov kev tswj hwm thiab cov nqi saib xyuas, thiab paub qhov hloov tau yooj yim, txhim khu kev qha thiab muaj txiaj ntsig network lag luam thiab kho. Yog li no, SDH optical kis tau tus mob yog qhov chaw kub siab rau hauv kev tsim kho thiab kev siv tshuab xa xov xwm hauv ntiaj teb cov lus qhia rau tib neeg' s kev nthuav dav.

Kev sib kis network yog tsuas yog muab faib ua peb txheej: nkag txheej, txheej nruab nrab thiab txheej txheej qaum.

Lub chaw xa hluav taws xob hauv cheeb tsam yog xa mus rau lub chaw xa hluav taws xob, kho hluav taws xob fiber ntau network, txuas hluav taws xob / sib txuas lus thiab kho chav sib txuas, cov chaw sib kis tau hais txog SDH / PTN / OTN thiab PON network.

Txoj kev loj hlob ntawm kho qhov muag thauj network

Nrog qhov rov tshwm sim ntawm cov ntse hauv lub network tau txhawb los ntawm microprocessors, kev sib koom ua ke ntawm kev kub ceev thiab loj muaj peev xwm kis tau tus mob optical fiber technology thiab ntse network thev naus laus zis ua rau SDH optical synchronous kis network tau tshwm sim raws li lub sijhawm xav tau.

SDH hu ua synchronous digital kis tau tus mob, uas txheem cov qauv thav duab, hom sib txuam sib luag, qib sib kis thiab qib kev sib pauv hom hom digital. Tib lub sijhawm, SDH txhim kho qhov tsis zoo ntawm PDH uas tsis yog muaj txiaj ntsig rau qhov muaj peev xwm loj kis tau.

SDH Tus Nqi

Qib theem ntawm SDH lub teeb liab yog qhia raws li STM-N, qhov twg n yog qhov zoo suav. Tam sim no, SDH tsuas tuaj yeem txhawb nqa qee tus nqi n, uas yog, n tsuas yog 1, 4, 16 thiab 64. Qhov tseem ceeb tshaj plaws thiab tseem ceeb tshaj plaws teeb liab teeb liab yog STM-1, nrog rau tus nqi ntawm 155.520mbit / s. Qib siab dua STM-N teeb liab tau txais los ntawm kev nkag los ntawm theem pib module teeb liab STM-1 ntawm bytes. Tus nqi ntawm STM-4 qib yog 622.080mbit / s, qib STM-16 yog 2488.320mbit / s, STM-64 Tus nqi ntawm theem yog 9953.280mbit / s.

SDH kis tau tus mob hauv lub ntiaj teb no muaj tus qauv kev sib sau ua ke, digital kis tau tus nqi thiab tus qauv kho qhov muag, uas ua rau lub network tswj kev ua haujlwm. Yog li ntawd, nws muaj kab rov tav zoo sib xws. Nws tuaj yeem ua tau tiav tag nrho nrog PDH uas twb muaj lawm, thiab tuaj yeem haum txhua yam ntawm cov cim kev lag luam tshiab. Nws ua rau thoob ntiaj teb kev sib koom ua ke cov qauv xa hluav taws xob thiab txhim kho kev ntseeg tau ntawm lub network.

Lub sijhawm ntawm SDH yog tas li, uas ua rau tus nqi ntawm STM-N cov teeb liab tsis tu ncua. Piv txwv, STM-16 yog sib npaug rau 4 zaug STM-4 thiab 16 zaug STM-1. Txawm li cas los xij, E2 teeb liab tus nqi hauv PDH yog sib npaug rau 4 npaug ntawm E1 teeb tsa tus nqi. Yog li, SDH ua kom yooj yim rau txoj kev sib faib thiab faib cuab yeej technology, thiab nws yooj yim rau kev nce thiab nqis ntawm txoj kev, tshwj xeeb tshaj yog haum rau lub peev xwm loj kis tau.

Qhov zoo ntawm SDH:

Kev txhais ua ke ntawm SDH thev naus laus zis thiab kev siv tshuaj PDH ib txwm muaj qhov pom tseeb zoo li no:

1. Kev sib koom ua ke ntawm tus nqi: kev sib koom ua ke tsis zoo thiab kho qhov muag sib txuas.

2. Lub network muaj zog tswj kev muaj peev xwm: ntau lub network tswj tau bytes tau teev nyob rau hauv SDH tus qauv, uas tuaj yeem muab lub peev xwm ua kom tau raws li ntau yam.

3. Kev kho tus kheej lub nplhaib: SDH cov cuab yeej tseem tuaj yeem ua lub nplhaib sib txuas nrog kev tiv thaiv tus kheej kev tiv thaiv zoo, uas tuaj yeem tiv thaiv kev xa xov los ntawm kev txiav tawm thiab tag nrho cov kev pabcuam sib txuas lus raug kaw.

4. Byte multiplexing thev naus laus zis siv hauv SDH Technology: lub voj voog sab saud thiab sab tau yooj yim.

5. Thoob ntiaj teb kev sib koom ua ke cov qauv xa khoom stm-n

6. nws adopts synchronous multiplexing hom thiab saj zawg zog multiplexing kuas qauv, uas muaj dav adaptability

7. Npaj cov khoom siv rau sab saud ntau rau kev ua haujlwm ntawm lub network thiab tswj cov haujlwm

8. Software siv rau kev tswj hwm network tswj hwm thiab tswj, uas yooj yim nthuav. Software tau siv dav hauv SDH network kom tswj hwm thiab mloog zoo tsheb khiav ntawm kev sib txuas thiab cov ntsiab lus hla sib txuas. Software tuaj yeem tswj yuav luag txhua yam khoom siv sib txuas sib txuas thiab cov cuab yeej sib txuam hauv lub network.

Qhov tsis zoo ntawm SDH

1. Qhov ua tau zoo ntawm qhov system yog tsawg. Qhov nce ntawm kev ua tau zoo yuav txo qhov ntseeg tau, thiab qhov nce ntawm kev ntseeg tau yuav txo qis ua kom tau txais txiaj ntsig. Ib qho txiaj ntsig zoo ntawm SDH yog tias kev ntseeg tau ntawm lub system yog zoo heev (kev kawm siab ntawm kev ua haujlwm ntawm kev ua haujlwm thiab kev tswj xyuas).

2. Lub tshuab ntawm pointer hloov kho yog txoj. SDH system tuaj yeem ncaj qha txo qis dua cov cim teeb liab los ntawm lub teeb liab loj, tshem tawm cov txheej txheem ntau qib sib txuam / cov txheej txheem sib txawv.

3. Cawv ntawm kev siv loj ntawm cov software ntawm qhov system kev ruaj ntseg.

Qhov txiaj ntsig zoo ntawm SDH piv txwv ob lub fiber bidirectional multiplexing ntu tiv thaiv lub nplhaib network yog qhov kev siv tus kheej kev kho tus kheej cov nplhaib sib txuas network qauv. SDH muaj qhov muaj peev xwm tiv taus ib qho txhaum, sampling bidirectional multiplexing tiv thaiv lub nplhaib. Yog tias ib qho channel poob, nws tuaj yeem kis ntawm lwm txoj kev tiv thaiv. Qhov kev kho tus kheej tus kheej ntawm lub nplhaib sib txuas yog ib qho tseem ceeb heev ntawm SDH.

Lub network txheej txheem ntawm kev kho tus kheej lub nplhaib tuaj yeem muab faib rau plaub yam nram qab no: cov kab hluav taws xob tsis siv neeg lub suab sib pauv hloov lub nplhaib (1 + 1), cov paib seemirectional channel hloov lub nplhaib (1: 1), ob txoj kab hluav taws xob bidirectional multiplexing ntu tiv thaiv lub nplhaib thiab plaub fiber fiber cov kab ntsig sib tshooj sib txuas. seem kev tiv thaiv lub nplhaib.

SDH network synchronization hom muaj cov cwj pwm hauv qab no:

(1) Cov khoom siv sib kis ntawm kev hloov cov nodes ntawm SDH network yuav tsum ua haujlwm synchronously.

(2) Cov cuab yeej SDH raug zoo rau lub sijhawm luv luv tsis ua hauj lwm ntawm lub moos.

(3) Lub moos ntawm SDH cov cuab yeej yuav tsum muaj peb hom kev ua haujlwm: synchronous nrhiav hom, tuav hom thiab dawb oscillation hom.

(4) Lub 2Mbit / s teeb liab nqa los ntawm SDH kis xaib tsis tsim rau synchronous siv sij hawm xa cov phiaj xwm vim hais tias cov pointer hloov kho cov jitter.

(5) Daim ntawv thov cov ntsiab lus zoo heev ntawm DXC thiab ADM hauv SDH thev naus laus zis tuaj yeem ua rau lub sijhawm tsis ua haujlwm. Nws yuav tsum raug sau tseg tias tsis muaj teeb meem tawm sab nraud qhov twg los taug, taug qab lub sijhawm tsis tuaj yeem tshwm sim hauv qee kis. Thaum lub sijhawm siv lub voj voos tsis tuaj yeem raug tshem tawm, nws yog qhov zoo dua los txheeb xyuas tsuas yog ib qho chaw siv sab nraud, uas xav tau tshwj xeeb hauv kev sib tham.

Vim hais tias SDH muaj ntau lub network saum toj, nws lub network muaj kev hloov pauv tau. Nws tuaj yeem txhim kho lub network kev soj ntsuam, tswj kev ua haujlwm thiab ua haujlwm tsis siv neeg ua haujlwm, txhim kho lub network zoo, tab sis kuj tseem ua rau lub lag luam network ua haujlwm tau yooj yim, nyab xeeb thiab txhim khu kev qha, kom lub network hauj lwm tiav thiab muaj ntau yam.

SDH muaj kev ua tau zoo ntawm kev xa thiab hloov. Nws cov kab ntawm cov cuab yeej tuaj yeem muab kev ywj pheej los ntawm cov kev ua haujlwm zoo kom paub lub network ntawm ntau qib thiab topologies, uas yog hloov tau yooj yim.

Kev txhim kho yav tom ntej thiab kev cia siab ntawm SDH Technology:

1. Kev tsim kho ntawm SDH network tswj software

SDH yog cov txheej txheem nyuaj thiab network tswj hwm los ntawm software, uas rub cov kev kawm los ntawm cov kev tshawb fawb zaum kawg ntawm kev tshawb fawb hauv computer. Lub vev xaib tswj kev hloov pauv tau yooj yim nrog kev saib xyuas thiab kev siv thev naus laus zis yog tus yuam sij rau kev ua tiav lossis tsis ua tiav ntawm SDH network thev naus laus zis.

2. Kev txhim kho ntawm ultra siab ceev optical fiber kis tshuab

Vim tias qhov cuam tshuam ntawm cov hluav taws xob muaj hluav taws xob tsis zoo thiab cov cuab yeej siv hluav taws xob ntau, nws nyuaj rau lub sijhawm khoos phis tawm cov cuab yeej hluav taws xob feem ntau ntawm cov sib txuas lus sib txuas (TDM) kev sib txuas lus fiber ntau los tsim kho kom zoo dua thaum qhov kev sib kis tau mus txog 2.5gb / s. Kev txhim kho ntawm cov kev pabcuam broadband tso rau pem hauv ntej siab dua rau lub xa hluav taws xob. Yog li no, nws yog qhov tseem ceeb kom txais yuav qhov tseeb OTDM (optical lub sij hawm faib multiplexing) thiab DWDM (nthwv dej faib sib faib ntau yam sib txawv) cov thev naus laus zis wavelength qhov sib faib ntawm qhov sib faib me me yog qhov me me, nrog 0.2 nm lossis nws qhov sib txuam ua ke raws li lub suab yoj yoj.

3. SDH daim ntawv thov xa cov xov xwm nthuav dav

Feem ntau, qhov nruab nrab ntawm cov xa xov kab yog tsuas yog fiber ntau, txuas ntxiv los ntawm wireless. Hauv kev sib txuas lus wireless, microwave yog qhov tseem ceeb ntawm kev sib txuas lus. SDH microwave xa cov kab ke sib txuas tau nrog PDH microwave cov kab ke uas twb muaj lawm. Nws txais yuav qhov qub channel qhov luv ntawm pdh140mb / s system, piv txwv li 30MHz thiab 40MHz, tab sis nws yuav tsum tau xa cov kab hluav taws xob ntau dua.

4. SDH siv rau kev nkag mus rau broadband technology

Raws li kev xa cov khoom siv hluav taws xob ntawm B-ISDN, SDH yuav tsum muaj ntaub ntawv thov nkag mus siv network. Piv txwv li, yav tom ntej, cov hloov pauv yuav tuaj yeem muab cov kab hluav taws xob kho qhov muag raws li SDH tus qauv; Cov neeg yuav khoom ntawm cov keyboards yuav txhim kho mus rau V5, thiab yuav muaj peev xwm muab V5.3 cuam tshuam raws li SDH yav tom ntej. Ua li no, SDH cov cim taw qhia tau ncaj qha rau tus neeg siv / network sib txuas (UNI) los ntawm cov pob taws.

SDH tau dhau los ua lub hauv paus ntawm kev sib kis network kev tsim kho vim nws cov txiaj ntsig zoo. Kev sib xyaw ntawm SDH technology thiab qee cov thev naus laus zis, xws li WDM, ATM thiab IP hla SDH, ua rau SDH network ntau dua thiab tseem ceeb dua. SDH tau teev nyob rau hauv daim ntawv thov ua haujlwm ntawm kev sib txuas lus sib txuas nrawm hauv xyoo pua 21st. Nws raug lees paub raws li kev txhim kho kev taw qhia ntawm digital kis network hauv kev lag luam kev sib txuas lus, thiab muaj kev lag luam zoo kawg.

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