Kho qhov muag cables: zoo tshaj disadvantages

Nyob rau hauv lub seventies, nws ua heev cob xub muaj ib hmo teeb nyob rau hauv lub chav pw, muaj raws ntawm ib tug hemispherical pedestal protruding los ntawm nws waveguides beam. Nyob rau hauv no siv qhov tsaus ntuj nti dim lub teeb faib nyob rau hauv daim ntawv ntawm cov me me tsuas me me, kub nyob rau ntxeev nyias translucent fibers. Qhov no yog tiag tiag ib tug zoo nkauj tshaj plaws yog ua los ntawm cov khoom pov tseg ntawm ib tug tshiab zoo ntawm cov ntaub ntawv ntawm cov. Lub npe lawv - optic cables (aka - installer, piv txwv li fiber-optic kev sib txuas lus kab).

FOL ua haujlwm txojcai

Tej hluav taws xob neeg xyuas pib muaj ib tug tsis kam xwb tsis active, tab sis kuj reactive (capacitive thiab inductive). Cov lub cev tsis yog nyob rau txoj kab uas hla ntawm lub hlau, nws yoj zog, thiab tiv thaiv cov kab ntev txuas lub sender lub teeb liab nrog txais ntaus ntawv. Tshwj xeeb yog nkag siab resistive siab channel zoo sib txuas lus raws. Fiber-optic cable tsis muaj no drawback, nws losses me npaum li cas tshaj nyob rau hauv cov pa conductors, vim hais tias cov ntaub ntawv cab kuj yog lub teeb lub zog. channel txiav txim hauv paus ntsiab lus yog tseeb thiab yooj yim. Thaum link teeb liab yog cov tswv yim, hloov dua siab tshiab los ntawm hluav taws xob rau kho qhov muag. Thaum lub qhov hluav taws xob muaj yog nws demodulation, thiab nws nkag mus rau hauv receiver-ntaub ntawv ntaus ntawv muaj ib tug li ib txwm voltage pulses.

Qhov zoo ntawm Fiber Channel

Nyob rau hauv tas li ntawd mus tsis kam mus cuam tshuam thiab attenuation, kho qhov muag cables muaj lwm yam tseem ceeb heev zoo. Thaum cov kis ntawm cov ntaub ntawv nyob rau hauv lub fiber ntau raws li ib tug yooj yim heev kom nws pub leej twg paub, vim hais tias nws yog suab tsis yooj yim sua kom txuas mus rau lawv nyiag. Lwm zoo dua ntawm no txoj kev ntawm kis tau tus mob yog nyiaj txiag. Tooj - ib qho kim hlau thiab nqaij daim tawv, nyob rau hauv lub waveguide ntaub ntawv ntau tus nqi pheej yig. Kho qhov muag cable yog tsim los ntawm quartz los yog tshwj xeeb polymer compositions (Fluoro-aluminate, los yog Fluoro-zirconate), uas kuj (peb meej mom) yog npaum li cas sib zog tshaj hlau nyob ntawm tej uas yuav tsum tau soj ntsuam xyuas.

kho qhov muag sib txuas lus shortcomings

Yog, kho qhov muag cables, raws li zoo raws li txhua yam nyob rau hauv lub ntiaj teb no, tsis yog tsis muaj drawbacks.

Firstly, tig los sib txuas lus nrog qhib Circuit Court yuav tsum tau hloov ntawm tag nrho puas cheeb tsam, tsis tau spliced waveguides li tiag tsub kom tus nqi ntawm kev kho.

Secondly, qhov installation ua hauj lwm no kuj tsis yog pheej yig tus nqi. Rau lawv siv yuav tsum precision machinery, thiab nws yog kim kim. Thiab txawj yuav tsum tau txiav txim siab, thiab lawv xav tau thiab them raws li.

Thirdly, mus hais tias teeb liab converter ntawm lub tswv yim thiab tso zis kab, raws li zoo raws li connectors (pab kiag li lawm uas muab switching), heev xav tau nyob rau hauv cia siab rau, kho qhov muag losses ntawm cov neeg. Hais tias qhov zoo yog tsim nyog cov nyiaj, tsis muaj ib tug xav tau kev pab los piav.

neej yav tom ntej Kev sib txuas lus

Tseem, qhov zoo ntawm cov ntau. Kho qhov muag cables yuav kis ib tug broadband teeb liab, uas ho tsub kom cov kev ceev ntawm cov ntaub ntawv pauv (ntsuas twb nyob rau hauv terabits ib ob). Thaum zoo li no attenuation yog tsis tshua muaj me me (ntawm ib tug wavelength ntawm 1,55 microns, nws tsuas yog 0,22 dB / km). Ntxiv mus, lub peev xwm ntawm lub teeb tsis tsiv nyob rau hauv opposite kev qhia (nrog differing polarization) nyob rau hauv ib fiber optic neeg xyuas pib tsub kom lub sij hawm. Lawv txoj kev txhim kho ntxiv.