Yog tsis muaj lub network sib kis, cov ntaub ntawv sib txuas lus tsis tuaj yeem ua tau ntawm cov khoom sib txawv ntawm lub network.
1. Kis Network
Tuskis tau tus mob networkyog ib lub network siv los ua cov xa xov xa tawm, thiab feem ntau siv nyob rau hauv kev hloov network, cov ntaub ntawv network, thiab pab txhawb cov network kom muab lub teeb liab xa xov thiab hloov dua siab tshiab network, thiab zwm rau hauv cov network yooj yim ntawm peb saum toj ntawm cov network.
Cov chaw sib kis tau dav dav kawm fiber ntau cable, tooj liab hlau, teeb liab suab nrov, cuam tshuam, txuas, hloov tshuab, microwave tshuab, PDH, SDH, WDM, ASON, thiab cov xaib.
Kev sib xyaw ua ke ntawm lub xaib thiab cov ntaub ntawv network thiab lub suab network zoo heev, thiab qhov kev ncua deb ntawm kev sib txuas lus hauv xov tooj yog qhov chaw nyob deb.
Cov hauv qab no yog qhov raug 2 G sib txuas lus sib txuas lus sib txuas xov tooj xa xov network network architecture:
2. PDH (Plesiochronous Digital Hierarchy)
PDH, ib qho kev sib tshooj xov xwm digital, yog ib qho kev xa xov hluav taws xob thaum ub uas tau pib tawm thiab tsim tawm sai heev ntawm 1980 s.
PDH feem ntau muaj ob kab lus ntawm cov qauv:
(1) E 1, PCM 30 / 32 channel, 2. 048 Mbps, tau txais yuav los ntawm Tebchaws Europe thiab Tuam Tshoj.
(2) T 1, PCM 2 4 / channel, 1. 544 Mbps, yog saws hauv North America.
Muaj qee qhov tsis zoo ntawm PDH:
(1) Tsis muaj ib qho qauv zoo thoob ntiaj teb
(2) Cov qauv nyuab thiab cov nqi siab
(3) Txoj kev tu yog qhov nyuaj
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3. SDH (Synchronous Digital Hierarchy)
SDH, Synchronous Digital Hierarchy, synchronous digital series, kuj yog lub tshuab xa hluav taws xob. Nws yog kev sib txuas ua ke ntawm cov xa xov hluav taws xob thiab cov tshuab network ntse.
Qhov kev xav ua ntej tshaj plaws ntawm SDH lub tswv yim yog Asmeskas Tswb Kev Sib Txuas Lus Lub Koom Haum, uas tau hu ua Optical Synchronization Network (SONET).
Hauv 1988, International Telegraph thiab Telephone Consultative Committee (CCITT) lees txais lub tswv yim ntawm SONET thiab hloov npe ua SDH.
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Piv rau PDH, SDH muaj cov zoo li nram no:
● Network tswj kev muaj peev xwm tau zoo heev.
Kev sib koom ua ke ntawm cov qauv thiab kev tsis sib thooj tshwj xeeb pab txhawb kev sib tshuam ntawm cov tuam ntxhab sib txawv.
Suitable rau loj muaj peev xwm kis.
Tshaj tawm lub tswv yim tshiab ntawm kev kho tus kheej-network thiab txhim kho kev tiv thaiv.
Technology Byte multiplexing thev naus laus zis ua rau lub zog qaum thiab qis dua cov cim qhia hauv lub network yooj yim heev.
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4. MSTP (Ntau Qhov Haujlwm Sib Pab Thauj Sib Tw)
MSTP (SDH-based-service thauj ntau) yog hais txog ntau yam kev pabcuam uas muaj kev koom ua ke nrog kev sib koom ua ke rau kev nkag mus, ua thiab xa cov kev pabcuam xws li TDM, ATM, thiab Ethernet raws li SDH platform.
Cov kev sib raug zoo ntawm PDH, SDH thiab MSTP:
5. PTN (Pob Ntawv Thauj Network)
PTN hais txog qhov kho qhov muag thauj mus los tsim kho lub vev xaib thiab cov thev naus laus zis tshwj xeeb: txheej txheej yog tsim los ntawm IP kev pabcuam thiab kev sib kis sib kis tau kho qhov nruab nrab, uas yog tsom rau qhov tawg thiab ua kom rov zoo li qub ntawm pob ntawv. Tsim qauv nrog cov kev xav tau ntawm kev xa khoom, nrog pob ntawv cov kev pabcuam raws li lub hauv paus thiab txhawb ntau cov kev pabcuam, nrog rau tus nqi qis dua ntawm tus tswv cuab (TCO), thaum ua raws li cov kev coj ua zoo ntawm kev siv hluav taws xob, suav nrog kev ua haujlwm siab thiab kev ntseeg tau, kev tswj bandwidth zoo. thiab Kev tsav tsheb engineering, yooj yim OAM thiab kev tswj hwm network, kho kom haum, kev ruaj ntseg siab, thiab lwm yam.
6. WDM (Wavelength Division Muab Ntau Ntau)
WDM yog txheej txheem uas siv ntau lub lasers rau tib lub sijhawm sib kis ntau cov kab nrig ntawm cov sib txawv ntawm lub cev sib npaug ntawm ib qho fiber ntau. Txhua lub teeb liab raug hloov kho los ntawm nws cov ntaub ntawv (cov ntawv nyeem, lub suab, video, thiab lwm yam) thiab kis tau raws li nws cov kab xev tshwj xeeb.
WDM tuaj yeem ntxiv qhov peev txheej ntawm cov txheej txheem fiber ntau tam sim no rau cov tuam txhab xov tooj thiab lwm tus neeg siv. Cov neeg tsim khoom tau tshaj tawm cov WDM systems, tseem hu ua DWDM (Dense Wavelength Division Multiplexing) cov tshuab.
DWDM tuaj yeem txhawb nqa ntau dua li 150 sib txawv yoj yoj ntawm lub teeb yoj mus rau kev sib kis tau ib txhij, thiab txhua lub teeb ntawm lub teeb tuaj yeem ncav cuag cov ntaub ntawv sib kis ntawm mus txog 10 Gb / s. Txoj kab ke no tuaj yeem muab cov ntaub ntawv sib kis ntawm ntau dua 1 Tb / s ntawm cov kab xev fiber ntau ua rau hnyav dua li cov plaub hau.
Kev sib txuas lus kho qhov muag yog txoj hauv kev uas lub teeb nqa teeb liab rau kev sib kis. Hauv thaj teb ntawm kev sib txuas lus kho qhov muag, tib neeg nyiam los tis npe ntawm lub yoj yoj tsis yog los ntawm ntau zaus. Yog li, thiaj li hu ua Wavelength Division Multiplexing (WDM) yog qhov tseem ceeb zaus faib ntau zaus.
WDM yog ib qho system uas nqa ntau lub yoj yoj (raws) ntawm ib qho fiber ntau thiab hloov ib lub fiber ntau rau hauv ntau lub "virtual" fibers. Tau kawg, txhua lub ntsej muag virtual ua haujlwm ntawm nws tus kheej ntawm cov txheej txheem sib txawv, uas ua rau muaj peev xwm ntau qhov kis tau ntawm lub fiber.
Vim tias qhov kev lag luam thiab kev ua tau zoo ntawm WDM cov cuab yeej technology, nws tau dhau los ua qhov tseem ceeb ntawm kev nthuav dav cov kev sib txuas lus fiber ntau tam sim no. Raws li lub tswvyim txheej txheem, WDM thev naus laus zis feem ntau muaj peb hom kev ua haujlwm sib luag, hu ua wavelength division multiplexing ntawm 1 310 nm thiab 1 550 nm wavelength, Coarse Wavelength Division Multiplexing (CWDM) thiab nthwv dej loj. DWDM, Dense Wavelength Division Ntau Ntau.
7. OTN (Optical Thauj Network)
OTN raws li WDM thev naus laus zis. Optical thauj network (OTN), ib hom kev sib txuas, yog hais txog kev thauj xa mus uas siv rau kev xa mus, sib txuam, kev thauj mus los, thiab kev soj ntsuam cov kev pabcuam hauv cov cim kho qhov muag, thiab tuaj yeem lav cov ntsuas kev ua haujlwm thiab kev nyob nyab xeeb.
OTN thev naus laus zis yog cov khoom lag luam ntawm kev sib cais ntawm cov hluav taws xob thiab txhua qhov kev sib koom ua ke. Nws hloov pauv SDH's haib OAM 0010010 amp; P cov ntsiab lus thiab cov haujlwm rau hauv WDM optical network, ua rau muaj kev tswj xyuas kev ua haujlwm zoo thiab kev tswj xyuas cov haujlwm ntawm WDM uas twb muaj lawm. tsis txaus ntseeg.
OTN thev naus laus zis tuaj yeem txhawb nqa kis mus rau cov neeg siv cov lus taw qhia, lub siab bandwidth multiplexing hloov thiab teeb tsa (kab lis kev cai tsawg kawg yog ODU 1, txog 2. 5 Gbit / s), nrog lub taub hau muaj zog txhawb, muaj zog OAM muaj nuj nqi, thiab kev txhawb nqa rau ntau txheej txheej Teeb ntawm Kev Sib Txuas Txuas Txuas (TCM) cov yam ntxwv nrog rau Forward Error Correction (FEC) txhawb nqa.
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