Txhawm rau nkag siab txog cov kab hluav taws xob tiv thaiv kab mob, koj thawj zaug yuav tsum nkag siab qhov sib txawv ntawm cov kab hluav taws xob uas tsis muaj kev tiv thaiv thiab cov kab hluav taws xob tiv thaiv. Ib txoj hlua khi hlua khi hlua khi yog ib lub cable uas muaj kev tiv thaiv kev tiv thaiv thiab tuaj yeem tshem tawm qhov cuam tshuam tam sim no rau hauv av. Unshielded twisted khub cables tsis muaj cov haujlwm no. Txawm li cas los xij, vim tias nws muaj zog ua haujlwm, cov txheej txheem kev teeb tsa ntawm cov kab hluav taws xob thaiv hluav taws xob yuav raug nqi tiv thaiv ntxiv. Yog li ntawd, shielded twisted-pair cables yog me ntsis kim dua unshielded twisted khub, thiab ntau xim yog them rau shielding. Yog tias cov neeg siv muaj kev xav tau ntau dua rau kev ua haujlwm, feem ntau Nws yog qhov zoo dua los siv cov ntaub thaiv npog twisted.
Cov kab hluav taws xob tiv thaiv kab hluav taws xob feem ntau yog muab faib ua ob txoj kev tiv thaiv, uas yog braided shielding thiab zaj duab xis shielding.
Lub braided shielded yog braided los ntawm liab qab tooj liab hlau los yog tinned tooj liab hlau rau hauv ib tug mesh shielding txheej, uas muaj zoo conductivity thiab suab nrov txo cov nyhuv tshaj txhuas. Nws tuaj yeem yooj yim txuas rau lub connector los ntawm crimping thiab welding lub braid. . Txawm li cas los xij, qhov tsis zoo ntawm braided shielding yog 100% kev pabcuam tsis tuaj yeem ua tiav. Raws li txoj cai, lub braid ceev yog 70% mus rau 95% kev pab them nqi. Hauv daim ntawv thov tiag tiag, 70% kev pab them nqi tom qab kho cable yog txaus.
Lwm hom kev tiv thaiv zaj duab xis yog siv cov txheej txhuas nyias rau kev tiv thaiv, uas tuaj yeem ua tiav 100% kev tiv thaiv ib puag ncig tus neeg xyuas pib, tab sis qhov tsis zoo yog tias nws cov conductivity qis dua tooj liab braided shielding.
(U=unshielded; F=zaj duab xis shield; S=woven shield; TP=twisted khub) Common shielding qauv:
Ib txheej shielding: UTP thiab FTP yog ib leeg-shielded network cables uas feem ntau siv txhuas ntawv nyiaj. Cov qauv muaj ib daim thaiv npog rau txhua khub lossis plaub khub ntawm cov khub twisted saum tus neeg xyuas pib thiab cov insulator, thiab cov ntaub thaiv nyias nyias tuaj yeem tiv thaiv cov khub uas nyob ib sab ntawm crosstalk.
Kev tiv thaiv tag nrho: F / UTP, S / UTP thiab SF / UTP yog thaiv tag nrho los ntawm cov ntaub ntawv sib txawv." Integral" hais txog cov hlau lub cev npog, uas pab tiv thaiv EMI (electromagnetic cuam tshuam) los ntawm kev nkag los yog tawm hauv lub cable.
Muab ob npaug rau thaiv: F / FTP, S / FTP thiab SF / FTP yog ib tus zuj zus thiab tiv thaiv ib leeg, nrog rau ob txheej thaiv kev tiv thaiv, uas txhim kho lub peev xwm tiv thaiv electromagnetic cuam tshuam.
