1, optical modem yog lub teeb liab optical rau hauv Ethernet hluav taws xob teeb liab khoom siv, optical modem yog thawj hu ua modem, yog ib hom khoom siv computer, nyob rau hauv qhov kawg xa los ntawm kev hloov pauv ntawm cov teeb liab digital mus rau hauv cov teeb liab analog, thiab ntawm qhov kawg tau txais los ntawm demodulation analog teeb liab mus rau hauv cov teeb liab digital.
Ib lub Optical Network Unit (ONU) yog ib lub optical network unit. Lub ONU muab faib ua cov active optical network units thiab passive optical network units. Lub ONU feem ntau yog siv los txais cov ntaub ntawv tshaj tawm los ntawm OLTs. Ntxiv nrog rau qhov ua haujlwm ntawm lub teeb cat, ONU kuj muaj qhov ua haujlwm ntawm switch.
2, ONU muab faib ua pawg a, b, c, thiab peb pawg no yog optical access, tiam sis kom muab cov neeg siv nrog tus lej ntawm cov chaw nres nkoj, hom chaw nres nkoj sib txawv, optical modem yeej yog ib pawg ONU.
Optical modem, tseem hu ua optical cat, yog ib lub cuab yeej network uas xa cov teeb liab optical mus rau lwm cov teeb liab protocol los ntawm optical fiber media. Nws yog ib lub cuab yeej xa relay rau lub network loj (LAN), metropolitan area network (MAN), thiab wide area network (WAN). Lub cuab yeej no muaj xws li xa, txais, tswj, interface, thiab muab fais fab. Nws siv cov chip loj, yooj yim circuit, siv hluav taws xob tsawg, muaj kev ntseeg siab, qhia txog lub tswb ceeb toom tiav, thiab muaj kev tswj hwm network zoo meej.
Kev sib txuas lus fiber ntau tau tsim sai sai rau hauv daim ntawv tseem ceeb ntawm kev xa cov ntaub ntawv vim nws muaj qhov zoo xws li qhov dav dav thiab muaj peev xwm loj. Yuav kom paub txog kev sib txuas lus optical, yuav tsum tau ua kom pom kev optical modulation thiab demodulation. Yog li ntawd, ua lub cuab yeej tseem ceeb ntawm kev sib txuas lus fiber ntau, optical modem tau txais kev saib xyuas ntau dua. Muaj ob hom optical modulators: direct modulator thiab external modulator, thiab optical demodulator muab faib ua ob hom: nrog thiab tsis muaj built-in pem hauv ntej amplifier. Direct modulator thiab demodulator nrog built-in pem hauv ntej amplifier yog qhov tseem ceeb ntawm qhov project no. Direct modulation muaj qhov zoo ntawm kev yooj yim, kev txuag nyiaj thiab kev siv yooj yim, thaum lub demodulator nrog built-in pem hauv ntej amplifier muaj cov yam ntxwv ntawm kev koom ua ke siab thiab me me.
modem optical yog ib lub cuab yeej xa xov uas tuaj yeem txuas rau hauv Is Taws Nem nrog kev sib txuas ntawm lub network cable, zoo ib yam li peb lub teeb pom kev hauv Is Taws Nem, tab sis qhov kawg sab saud ntawm lub teeb pom kev yog txuas nrog lub voj voog, thiab qhov kawg sab saud ntawm lub teeb pom kev zoo txuas nrog txoj kev teeb, yog li nws raug xa mus rau lub teeb pom kev. Lub teeb pom kev txuas nrog txoj kev teeb. Qhov kawg qis ntawm onu hauv epon / GPON yog txuas nrog tus neeg siv.
1, optical modem yog ib hom onu, yog rau ib tus neeg siv, optical modem kuj tseem tuaj yeem hais tias yog desktop onu.
2, lub onu tseem ceeb yog rau ntau tus neeg siv, uas yog, qhov chaw nres nkoj hluav taws xob muaj 8 txog 24 pon chaw nres nkoj. Lub modem optical tsuas muaj 1-4 qhov chaw nres nkoj hluav taws xob.
Qhov sib txawv ntawm optical modem thiab ONU:
Feem ntau, optical modem siv rau cov neeg siv khoom loj, feem ntau yog rau kev nkag mus rau cov ntaub ntawv tshwj xeeb.
hom daim npav modem optical thiab desktop, hom daim npav feem ntau muab tso rau hauv chav tshuab.
Lub desktop feem ntau yog muab tso rau ntawm tus neeg siv khoom. ONU siv rau kev nkag mus rau hauv broadband hauv tsev. Qhov sib txawv tseem ceeb yog los ntawm daim npav chav sib xyaw ua ke optical cat mus rau tus neeg siv khoom desktop optical cat, ib khub optical cat suav rau ib khub fibers, thiab los ntawm chav sib xyaw ua ke OLT mus rau tus neeg siv khoom ntau ONUs kuj tsuas yog siv ib khub fibers, thiab nruab nrab mus dhau qhov txheej txheem faib. Qhov sib txawv ntawm optical modem thiab ONU yog tias ONU txuag cov peev txheej fiber core, thiab optical modem pheej yig dua, thiab ib khub ntawm lub teeb cats yog ntau pua daim. Hom twg siv, kev tshuaj xyuas tag nrho ntawm tus nqi, raws li qhov xwm txheej.
Lub sijhawm tshaj tawm: Lub Kaum Ob Hlis-14-2023