Kev nthuav qhia

Cov fiber ntau ua tsis tiav thiab lawv cov kev daws teeb meem

2021-07-29

Cov fiber ntau qhov muag tau muab ntim rau hauv hnab yas kom nws tuaj yeem khoov yam tsis tawg. Feem ntau, cov cuab yeej xa tawm ntawm ib kawg ntawm cov kho qhov muag fiber siv lub teeb pom kev zoo los yog lub teeb ci laser kom xa lub teeb ci mus rau qhov kho qhov muag fiber, thiab cov cuab yeej tau txais ntawm lwm qhov kawg ntawm cov kho qhov muag fiber siv lub teeb pom kev zoo txhawm rau txheeb xyuas noob taum.

Ua ntej, seb lub teeb pom kev zoo ntawm lub kho qhov muag fiber ntau lub khoos phis tawj lossis lub khoos phis tawj kho qhov muag pom thiab lub teeb pom ntawm qhov chaw sib tw sib tw tau qhib

Yog tias qhov ntsuas FX ntawm tus xa xov hluav taws xob raug kaw, thov xyuas kom tseeb tias cov kab txuas fiber ntau tau txuas nrog; ib kawg ntawm cov fiber ntau jumper txuas nrog ua ke; lwm qhov kawg txuas nrog hom ntoo khaub lig. Yog hais tias qhov chaw nres nkoj kho qhov muag (FX) qhov ntsuas ntawm A transceiver tau qhib thiab qhov chaw nres nkoj kho qhov muag (FX) qhov taw qhia ntawm B transceiver raug kaw, qhov ua txhaum yog nyob ntawm A transceiver: ib qho muaj peev xwm yog: A transceiver (TX) kho qhov muag chaw nres nkoj tau ua tsis zoo, vim tias qhov chaw nres nkoj kho qhov muag (RX) ntawm B transceiver tsis tuaj yeem txais lub teeb pom kev zoo; lwm qhov muaj peev xwm yog: qhov sib txuas fiber ntau ntawm qhov kho qhov muag chaw nres nkoj ntawm A transceiver (TX) muaj teeb meem (cov kab hluav taws xob kho qhov muag lossis cov hlua hluav taws xob txuas hluav taws xob tuaj yeem tawg).

Twisted pair (TP) qhov ntsuas tawm, thov xyuas kom tseeb tias qhov sib txuas ua ke sib txuas tsis raug lossis txuas tsis raug. Thov siv tus ntsuas ntsuas txuas mus kuaj; qee qhov hloov pauv tau muaj ob lub RJ45 chaw nres nkoj: (Rau HUB) qhia tias txoj hlua txuas txuas qhov hloov pauv yog txoj kab ncaj ncaj; (Rau Node) qhia tias txoj hlua txuas ntawm qhov hloov pauv yog kab hla hla; qee tus xa xov Muaj MPR hloov ntawm sab: nws txhais tau tias kab txuas mus rau qhov hloov yog kab ncaj ncaj; DTE hloov: txoj kab sib txuas uas txuas nrog lub hloov pauv yog kab hla kab.



Qhov thib ob, siv lub ntsuas hluav taws xob kho qhov muag kom pom

Lub zog siv hluav taws xob ntawm lub tshuab xa hluav taws xob fiber ntau lossis cov qauv kho qhov muag raws li qhov xwm txheej ib txwm muaj: multimode: nruab nrab -10db thiab 18db; ib hom 20 km: nruab nrab ntawm -8db thiab 15db; ib hom 60 km: nruab nrab -5db thiab 12db; Yog tias lub zog siv hluav taws xob ntawm lub tshuab xa hluav taws xob kho qhov muag nyob nruab nrab ntawm -30db-45db, tom qab ntawv nws tuaj yeem txiav txim siab tias muaj teeb meem nrog lub transceiver.



Thib peb, puas muaj qhov ua yuam kev hauv ib nrab/tag nrho duplex hom

Muaj qhov hloov pauv FDX ntawm ib sab ntawm qee qhov kev xa xov: nws txhais tau tias yog duplex tag nrho; HDX hloov: nws txhais tau tias ib nrab duplex.

Plaub, txawm hais tias cov kab hluav taws xob fiber ntau optic thiab cov hluav taws xob dhia tau tawg lawm

a Kev ntsuas qhov muag pom ntawm lub ntsej muag: siv lub teeb nyem laser, lub hnub ci, lossis lub teeb pom kev zoo kom pom qhov kawg ntawm qhov txuas txuas hluav taws xob txuas lossis txuas txuas; saib puas muaj qhov pom kev pom ntawm lwm qhov kawg? Yog tias pom lub teeb pom kev, nws qhia tau hais tias cov kab hluav taws xob tsis tawg.

b. On-off nrhiav kom pom qhov sib txuas ntawm fiber ntau: siv lub teeb ci laser, tshav ntuj, thiab lwm yam kom pom qhov kawg ntawm cov kab hluav taws xob kho qhov muag; saib puas muaj qhov pom kev pom ntawm lwm qhov kawg? Yog tias muaj lub teeb pom kev, nws qhia tau hais tias cov jumper fiber tsis tawg.