Kuv nquag hnov ib tug hais tias, "Kuv tus miv tsis ua zoo." Yog li cas tus miv hauv kuv tsev neeg? Koj paub ntau npaum li cas?
Lub modem, feem ntau hu ua "miv", yog thawj lub cuab yeej txuas nrog broadband tom qab nws nkag mus rau hauv tsev.
Modulation thiab demodulation, tseem hu ua modem, luv luv rau Modulator thiab Demodulator, feem ntau hu ua modem. Qee tus neeg kuj nyiam hu nws ua "miv" raws li kev lom zem ntawm Niaj hnub no.
Ntev dhau los, cov neeg hauv tsev hu xov tooj los ntawm modems, qhov twg ib tus neeg txuas nrog lub ntiaj teb sab nraud los ntawm kab xov tooj thiab lwm tus neeg txuas nrog lub computer los ntawm kab xov tooj. Lub luag haujlwm ntawm "miv" yog los hloov cov teeb liab analog (speech waveforms) rau hauv cov cim digital (code "0" thiab "1" uas cov khoos phis tawj tuaj yeem paub).
Niaj hnub no, cov tsev neeg fiber ntau tau dhau los ua ntau dua, thiab "cov miv kho qhov muag" tau tshwm sim. Raws li lub npe qhia, "Optical Network Terminal" kuj yog ib hom "miv" uas ua haujlwm raws li kev hloov kho thiab cov cuab yeej demodulation, tab sis nws hloov cov teeb liab kho qhov muag rau hauv cov teeb liab hluav taws xob.
Qee cov tub ntxhais kawm yuav nug seb tus miv thiab lub tsev router puas yog tib yam, tab sis raws li lawv txoj haujlwm, lawv tsis zoo ib yam. Yog li dab tsi yog qhov txawv ntawm lawv?
Raws li tau hais ua ntej, kev ua haujlwm ntawm "miv" yog hloov cov teeb liab, thiab lub router yog ib qho khoom siv uas tuaj yeem faib cov teeb liab rau ntau lub teeb liab. Piv txwv li, "miv" zoo li tus neeg txhais lus. Txhawm rau sib txuas lus nrog cov phooj ywg txawv teb chaws, koj xav tau nws los txhais lawv cov lus ua ib yam dab tsi koj tuaj yeem nkag siab; Lub "router" yog ib qho kev qhia ncig xyuas, thiab koj tsuas yog mus rau qhov chaw paub thaum ua si. Phau ntawv ncig xyuas tuaj yeem coj koj mus rau ntau qhov chaw koj xav mus.
Ib qho "miv" tsuas yog muaj ib qho chaw nres nkoj LAN, uas txhais tau hais tias nws tsuas tuaj yeem txuas tau ib qho khoom siv cable. Yog tsis muaj router, nws tsuas yog txuas nrog ib lub computer xwb. Qhov zoo dua "optical modem" kuj muaj lub luag haujlwm ntawm lub router, tab sis thaum muaj ntau yam khoom siv yuav tsum tau txuas nrog hauv tsev, lub router tseem xav tau kom yooj yim tswj lub network. Yog li tam sim no kev sib xyaw ntawm optical modem thiab router yog txoj kev tshawb fawb tshaj plaws thiab ntau yam.
Thaum siv lub router, peb yuav pom tias lub router tau sau npe WAN (qee lub routers yog Internet) thiab LAN (qee lub routers tau sau tias yog 1, 2, 3, 4). Ntau tus neeg siv xav kiv taub hau thaum xub thawj siab ib muag thiab tsis txawm paub qhov txawv ntawm WAN thiab LAN, yog li lawv tsis paub yuav ua li cas txuas.
WAN ntawm lub router feem ntau yog siv los txuas rau lwm cov tes hauj lwm (public networks), lossis txuas rau cov neeg siv khoom siv dav dav. Piv txwv li, thaum siv xov tooj, siv WAN los txuas rau "miv"; Fiber ntau optic cable
Thaum siv WAN, txuas rau optical modem; Thaum txoj kab tseem ceeb txuas nrog tsev neeg, WAN siv los txuas cov kab tseem ceeb rau tsev neeg. Lub LAN (1, 2, 3, 4) ntawm lub router yog siv los txuas cov khoom siv hauv cheeb tsam hauv cheeb tsam network (LAN), feem ntau yog txuas computers, keyboards, printers, thiab lwm yam khoom siv.
Cias muab, WAN ntawm lub router tsuas yog siv los txuas rau modem, optical modem, network hauv tsev, lossis qib siab dua, thiab tsis tuaj yeem siv los txuas rau lub computer. Hauv kev xyaum, ntau tus neeg siv txuas lawv lub computer cables rau WAN, ua rau routers ua haujlwm tsis zoo. Lub LAN (1, 2, 3, 4) ntawm lub router tsuas yog siv los txuas rau lub computer, thiab tsis tuaj yeem siv los txuas rau modem, optical modem, lossis tsev neeg Ethernet, txwv tsis pub nws tseem yuav ua rau lub router ua. txuas tsis tau.
