Qhov txawv yog feem ntau xav txog ob yam: cov khoom siv thiab kev sib kis ceev.
1. Ob yam khoom sib txawv
Coaxial cables feem ntau yog ua los ntawm tooj liab, thaum kho qhov muag cables feem ntau yog ua los ntawm fiber ntau optical.
2. Qhov sib kis ceev ntawm ob qhov sib txawv
Cov kev pabcuam hauv tsev fiber ntau optic cable ceev tau mus txog 100Mbps, thiab cov chaw muab kev pabcuam tau hais tias thaum kawg nws yuav nce tus lej no mus rau 1Gbps rau 10Gbps. Coaxial cables feem ntau tsuas yog tsim nyog rau kev sib kis hauv baseband, nrog tus nqi sib kis ntawm 2-20Mbps.
Cov yam ntxwv ntawm coaxial cables thiab optical cables:
1. Lub coaxial cable yog tsim los ntawm lub hollow txheej cylindrical neeg xyuas pib (tooj liab mesh) thiab ib tug neeg xyuas pib (cable tooj liab core) nyob rau hauv nruab nrab axis. Tus neeg xyuas pib sab hauv thiab cylindrical tus neeg xyuas pib, nrog rau tus neeg xyuas pib cylindrical thiab lub ntiaj teb sab nraud, raug cais los ntawm cov khoom siv rwb thaiv tsev. Nws cov yam ntxwv yog muaj peev xwm tiv thaiv kev cuam tshuam zoo, ruaj khov cov ntaub ntawv xa mus, thiab tus nqi pheej yig. Nws kuj yog siv dav, xws li kaw-circuit TV kab.
Niaj hnub no, nyias cable networking feem ntau yog siv hauv computer hauv cheeb tsam network. Nyias cables feem ntau yog siv rau tsheb npav hom network thaiv kev sib txuas. Siv T-hom BNC interface connector los txuas BNC interface network card, thiab nruab ib 50 Ω terminating resistor ntawm ob qho kawg ntawm cov coaxial cable.
2. Fiber optic cable yog ib qho me me thiab hloov tau yooj yim kis tau tus mob nruab nrab ntawm ib pawg ntawm cov khoom siv kho qhov muag siv los nthuav tawm cov kab teeb ci. Piv nrog rau lwm cov xov xwm sib kis, cov kab hluav taws xob kho qhov muag muaj qhov ua tau zoo ntawm cov hluav taws xob hluav taws xob hluav taws xob zoo, cov teeb liab tsawg dua, cov kab hluav taws xob ntau dua, thiab kev sib kis ntev dua. Fiber optic cables feem ntau yog siv rau kev sib txuas cov pob txha caj qaum uas xav tau kev sib kis ntev dua.
Fiber optic kev sib txuas lus yog ua tiav los ntawm kev tsim ib lub teeb ntawm lub teeb los ntawm lub optical transmitter, uas converts hluav taws xob teeb liab mus rau optical signals. Cov teeb liab kho qhov muag tau nkag mus rau hauv fiber ntau optic cable, thiab ntawm qhov kawg ntawm fiber ntau optic cable, lub optical receiver tau txais cov teeb liab kho qhov muag uploaded los ntawm fiber optic cable, converts lawv mus rau hauv hluav taws xob teeb liab, decodes lawv, thiab ua lawv. Fiber optic cables muaj qhov sib kis tau ntev thiab kev sib kis ceev ceev, ua rau lawv qhov nruab nrab kis tau zoo tshaj plaws hauv cheeb tsam hauv cheeb tsam. Kev teeb tsa thiab kev sib txuas ntawm cov kab hluav taws xob kho qhov muag yuav tsum ua kom tiav los ntawm cov kws tshaj lij cov neeg ua haujlwm.
Tam sim no muaj ob hom optical cables: ib leeg-hom optical cables thiab multi-mode optical cables. Cov tub ntxhais txoj kab uas hla ntawm ib hom kho qhov muag cable yog me me heev, thiab nws tsuas yog kis tau nyob rau hauv ib hom ntawm ib tug muab ua hauj lwm wavelength. Cov kis tau tus mob yog dav thiab muaj peev xwm kis tau tus mob loj. Multimode optical cables yog optical fibers uas muaj peev xwm xa tau ntau hom ib txhij ntawm ib tug muab kev khiav hauj lwm wavelength. Piv rau ib hom optical fibers, multi-mode optical fibers muaj kev sib kis tsis zoo.