Niaj hnub no, nyob rau hauv tam sim no network kev sib txuas lus tej yaam num, optical transceivers,optical fiber ntau transceivers, thiab optical modems tuaj yeem hais tau siv dav thiab muaj kev hwm los ntawm cov neeg ua haujlwm ruaj ntseg.Yog li, koj puas paub qhov txawv ntawm peb qhov Clear?
Optical modem yog ib yam khoom siv zoo ib yam li baseband MODEM (digital modem).Qhov sib txawv ntawm baseband MODEM yog tias nws txuas nrog rau ib qho kev kho qhov muag fiber ntau kab, uas yog lub teeb liab optical.
Nws yog siv rau kev hloov dua siab tshiab ntawm photoelectric teeb liab thiab interface raws tu qauv nyob rau hauv lub dav cheeb tsam network, thiab tus nkag router yog lub dav cheeb tsam network nkag.Lub photoelectric transceiver siv qhov kev hloov pauv ntawm lub teeb liab photoelectric hauv cheeb tsam hauv cheeb tsam network, tab sis tsuas yog lub teeb liab hloov dua siab tshiab, tsis muaj kev hloov dua siab tshiab ntawm qhov interface raws tu qauv.Nws feem ntau yog siv rau kev ncua deb hauv tsev kawm ntawv network thiab tsis haum rau ib puag ncig qhov twg. twisted-pair cables yog deployed.Txhawm rau kom paub meej qhov optical modem, photoelectric transceiver.Peb yuav tsum qhia txog qhov chaw uas lawv siv.
Optical Modem, tseem hu ua ib qho chaw nres nkoj optical transceiver, yog cov khoom tsim los rau cov neeg siv tshwj xeeb ib puag ncig.Nws siv ib khub ntawm optical fibers rau ib leeg E1 los yog ib leeg V. 35 los yog ib leeg 10BaseT point-to-point optical transmission terminal equipment.Raws li cov khoom siv sib kis ntawm cov khoom siv hauv zos, cov khoom siv no tsim nyog rau cov khoom siv kho qhov muag fiber ntau ntawm cov chaw nres tsheb hauv paus thiab cov khoom siv xauj tsev.Rau ntau qhov chaw nres nkoj optical transceivers, lawv feem ntau hu ua "optical transceivers".Rau ib qho chaw nres nkoj optical transceivers, lawv feem ntau siv rau ntawm tus neeg siv sab.Lawv ua hauj lwm zoo ib yam li feem ntau siv baseband MODEM rau WAN nplooj siab kab (circuit) networking."Optical modem" thiab "Optical Network Unit".
Optical transceivers tsuas yog cov khoom siv rau kev sib txuas lus cov ntaub ntawv.Cov khoom siv optical transceiver muaj ntau qhov sib txawv, muaj txiaj ntsig zoo rau kev xa xov hluav taws xob cable, qee qhov kev xa xov tooj, muaj txiaj ntsig zoo rau kev tswj hwm kev lag luam, thiab qee qhov tseem koom nrog "lub suab, cov ntaub ntawv, duab" thiab lwm yam kev pabcuam kom nkag mus rau Ib qho.
Lub optical fiber transceiver paub txog cov teeb liab hloov ntawm ib hom thiab ntau hom fiber ntau thiab twisted khub hauv Ethernet.Lub optical fiber transceiver yog Ethernet kis tau tus mob media conversion unit uas sib pauv luv luv-ncig twisted khub hluav taws xob teeb liab thiab ntev-ntev optical signals.Optical transceivers feem ntau yog siv nyob rau hauv qhov tseeb network ib puag ncig uas Ethernet cables tsis tuaj yeem them thiab fibers optical yuav tsum tau siv los txuas ntxiv kev sib kis;Nyob rau tib lub sijhawm, lawv tau pab txuas lub mais kawg ntawm cov kab hluav taws xob kho qhov muag mus rau cov chaw hauv nroog loj (tseem yog Ethernet thev naus laus zis) thiab ntau txheej txheej txheej.Internet kuj tau ua lub luag haujlwm loj.
Raws li qhov ceev, qhov optical fiber transceiver tuaj yeem muab faib ua 10M, 100M optical fiber transceiver,10/100M adaptive optical fiber ntau transceiverthiab 1000M optical fiber transceiver.10M thiab 100M transceivers ua haujlwm ntawm lub cev txheej, thiab cov khoom siv transceiver ua haujlwm ntawm cov txheej txheem rau cov ntaub ntawv me ntsis.Txoj kev xa mus no muaj qhov zoo ntawm kev xa mus ceev ceev, siab transparency tus nqi, qeeb qeeb, thiab lwm yam, yog qhov zoo dua hauv kev sib raug zoo thiab kev ruaj ntseg, thiab tsim nyog rau kev siv cov kev sib txuas ruaj khov.
Lub 10/100M optical fiber transceiver ua haujlwm ntawm cov ntaub ntawv txuas txheej.Ntawm cov txheej txheem no, lub optical fiber transceiver siv lub khw-thiab-rau-mus rau kev nyeem nws qhov chaw nyob MAC, qhov chaw nyob MAC, thiab qhov chaw nyob MAC rau txhua pob ntawv tau txais.Cov ntaub ntawv, cov ntaub ntawv cov ntaub ntawv raug xa mus tom qab CRC cyclic redundancy check tiav.Ua ntej, nws tuaj yeem tiv thaiv qee qhov tsis ncaj ncees lawm los ntawm kev sib kis hauv lub network thiab tuav cov peev txheej tseem ceeb hauv network.Nyob rau tib lub sijhawm, nws tseem tuaj yeem tiv thaiv cov ntaub ntawv pob ntawv poob vim muaj kev sib txuas hauv network.
Raws li cov qauv, nws tuaj yeem muab faib ua desktop hom optical fiber transceiver thiab khib hom optical fiber transceiver.Lub desktop optical fiber transceiver yog tsim rau ib tus neeg siv, xws li kev sib ntsib uplink ntawm ib qho kev hloov hauv txoj kev hauv tsev.Rack-mounted fiber optic transceivers yog tsim rau ntau tus neeg siv sib sau ua ke.
Raws li fiber ntau, nws tuaj yeem muab faib ua ntau hom fiber ntau transceiver thiab ib hom fiber ntau transceiver.Vim qhov sib txawv ntawm cov fibers optical siv, qhov sib kis ntawm qhov transceiver txawv.Kev sib kis dav dav ntawm ntau hom transceiver yog nyob nruab nrab ntawm 2 km thiab 5 kilometers, thaum ib hom transceiver tuaj yeem npog thaj tsam ntawm 20 mais mus rau 120 mais.Nws yuav tsum tau muab sau tseg tias vim qhov sib txawv ntawm kev sib kis deb, lub zog xa hluav taws xob, tau txais rhiab heev thiab wavelength ntawm fiber ntau optic transceiver nws tus kheej kuj yuav txawv.Lub zog xa hluav taws xob ntawm 5km optical fiber ntau transceiver feem ntau yog nruab nrab ntawm -20 txog -14db, thiab qhov tau txais rhiab heev yog -30db, siv lub wavelength ntawm 1310nm;Thaum lub zog xa hluav taws xob ntawm 120 km optical fiber ntau transceiver feem ntau yog nruab nrab ntawm -5 txog 0dB, thiab qhov tau txais rhiab heev yog 38dB, siv 1550nm wavelength.
Raws li tus naj npawb ntawm optical fibers, nws tuaj yeem muab faib ua ib leeg-fiber optical transceiver thiabdual-fiber optical transceiver.Tib fiber ntau yog kom paub cov ntaub ntawv tau txais thiab xa mus rau ib qho fiber ntau optical.Cov khoom lag luam no siv cov thev naus laus zis ntawm wavelength division multiplexing, thiab cov wavelengths siv feem ntau yog 1310nm thiab 1550nm.Vim yog siv wavelength division multiplexing, ib leeg fiber ntau transceiver khoom feem ntau muaj cov yam ntxwv ntawm cov teeb liab loj attenuation.Tam sim no, feem ntau ntawm cov fiber ntau optic transceivers nyob rau hauv kev ua lag luam yog dual-fiber khoom, uas yog tus paub tab thiab ruaj khov.
Zoo, cov saum toj no yog cov lus qhia txog qhov sib txawv ntawm optical transceiver, optical fiber transceiver thiab optical modem.Kuv vam tias nws yuav pab tau koj!