Tom qab ntau tshaj 40 xyoo, kev xa xov hluav taws xob network tau ntsib PDH, SDH / MSTP, WDM / OTN, PeOTN thev naus laus zis kev tsim kho thiab kev tsim kho tshiab.
PDH (Plesiochronous Digital Hierarchy) thev naus laus zis yog thawj coj ntawm thawj lub xov tooj kab hluav taws xob muab cov kev pab cuam lub suab.
Qhov thib ob tiam muab kev pabcuam Web surfing thiab TDM nplooj siab kab, siv SDH / MSTP (Multi-Service Thauj Platform) cov thev naus laus zis.
Lub cim thib 3 pib txhawb cov kev pabcuam video thiab cov ntaub ntawv xaib sib txuas, siv WDM (Wavelength Division Multiplexing) / OTN (Optical Transmission Network) thev naus laus zis.
Lub koob thib 4 tiam 4K HD ua yeeb yaj kiab thiab cov kab kev ua haujlwm zoo tau lees paub los ntawm PeOTN (Pob Khoom Txhawb Kev Ua Haujlwm OTN) thev naus laus zis.
Hauv thawj theem ntawm kev txhim kho ntawm thawj ob tiam, kev pabcuam suab, Kev nkag mus rau Web thiab TDM cov kab kev pabcuam tau sawv cev los ntawm SDH / MSTP synchronous digital system thev naus laus zis, txhawb Ethernet, ATM / IMA thiab lwm yam kev nkag tau. CBR / VBR thiab lwm yam kev pabcuam sib txawv tuaj yeem muab ntxig rau SDH thav ntawv, muab lub cev sib cais ntawm cov kav dej tawv thiab tsom rau kev coj tus kheej ntawm cov khoom hluav taws xob tsawg tsawg.
Tom qab nkag mus rau qib peb tiam ntawm txoj kev loj hlob, nrog txoj kev loj hlob sai ntawm kev pabcuam kev sib txuas lus muaj peev xwm, tshwj xeeb tshaj yog cov vis dis aus thiab cov ntaub ntawv nruab nrab cov kev pabcuam sib txuas, lub network bandwidth yog nrawm. Optical txheej tshuab thev naus laus zis sawv cev los ntawm WDM thev naus laus zis ua rau nws ua rau ib tus tib neeg xa khoom lag luam ntau dua. Tshwj xeeb, DWDM (ntom nti sib cais sib faib ntau yam sib txuam sib luag) technology tau siv dav hauv ntau qhov kev ua haujlwm hauv zej zog hauv kev sib txuas, kom daws tau cov teeb meem ntawm kis tau nrug thiab bandwidth muaj peev xwm. Saib cov nplai ntawm kev tsim kho hauv network, 100G tau dhau los ua lub hauv paus hauv kev sib tw ntev, thaum 200G hauv zos network thiab tus txiv neej tab tom txhim kho sai.
Rau cov yeeb yaj kiab, kev mob siab rau kab thiab lwm cov kev pabcuam sib xyaw, cov kev sib txuas sib kis hauv lub network xav tau kom muaj kev ywj pheej thiab kev txawj ntse ntau, yog li, OTN thev naus laus zis maj mam tshwm sim. OTN yog lub hom phiaj tshiab kho qhov muag xa khoom siv tshuab tau txhais los ntawm ITU-T G. 872, G. 798, G. 709 thiab lwm yam kev cai. Nws suav nrog kev ua tiav ntawm cov txheej txheem ntawm cov txheej txheem kho qhov muag thiab txheej txheej hluav taws xob, thiab muaj cov kev tswj hwm thiab tshuaj xyuas cov txheej txheem thiab kev tiv thaiv kev muaj sia nyob rau txhua txheej ntawm network. Los ntawm cov qauv tshiab tam sim no, domestic OTN tau dhau los ua tus qauv thauj khoom network, tshwj xeeb tshaj yog nyob rau hauv cov chaw tsim khoom hauv kev tsim kho hauv zos, thaj chaw hauv nroog, qhov yooj yim yog txais raws li txheej txheej hla ntawm OTN thev naus laus zis, siv txoj kab sib cais lub architecture, network sab thiab kab ntawv sab, decoupling, txhim kho qhov yooj ntawm kev sib txuas thiab kev lag luam muaj peev xwm ntawm kev qhib sai thiab xa tawm.
