Digital multiplexer yog ib qho khoom siv sib xyaw ua ke tsim los tswj kev sib kis ntawm cov ntaub ntawv los ntawm ntau qhov chaw cov ntaub ntawv mus rau cov khoom tso tawm. Qhov tseeb, cov cuab yeej no yog ob peb txoj haujlwm digital keyboards. Nws hloov tawm tias cov multiplexer digital yog qhov hloov pauv ntawm cov teeb liab tawm tswv yim rau hauv ib txoj kab tso zis.
Cov cuab yeej no muaj peb pawg ntawm cov tswv yim:
- chaw nyob, binary code uas txiav txim siab cov ntaub ntawv tawm tswv yim yuav tsum tau txuas nrog cov zis;
- xov xwm;
- pab (strobe).
Hauv kev tsim cov khoom sib xyaw ua ke, cov tshuab digital multiplexer muaj qhov siab tshaj plaws ntawm 16 cov ntaub ntawv nkag. Yog tias cov cuab yeej tsim los xav tau ntau tus lej, ces cov qauv ntawm cov ntoo multiplexer yog tsim los ntawm ntau lub chips.
Tus digital multiplexer tuaj yeem siv los ua ke yuav luag txhua yamcov khoom siv logic, yog li txo cov naj npawb ntawm cov ntsiab lus logic siv hauv circuits.
Txoj cai rau kev sib txuas ntawm cov khoom siv raws li kev sib tw:
- Carnot daim ntawv qhia yog tsim rau cov zis muaj nuj nqi (raws li qhov muaj nuj nqis ntawm kev ua haujlwm sib txawv);
- xaiv qhov kev txiav txim ntawm kev siv nyob rau hauv lub multiplexer circuit;
- ib daim npog matrix yog tsim, uas yuav tsum ua raws li qhov kev txiav txim ntawm multiplexer siv;
- nws yog qhov tsim nyog yuav tsum ua kom tiav cov txiaj ntsig ntawm Karnot daim ntawv qhia;
- tom qab ntawd, qhov ua haujlwm tau txo qis nyias nyias rau txhua qhov chaw ntawm matrix;
- raws li cov txiaj ntsig ntawm kev txo qis, nws yog qhov tsim nyog los tsim ib lub tswv yim.
Tam sim no cia peb txav los ntawm kev xav mus rau kev xyaum. Xav txog qhov twg cov khoom siv no siv.
Siv tau yooj yim multiplexers yog tsim los tsim cov kwj digital (thawj) ntawm qhov nrawm ntawm 2048 kbps los ntawm cov cim analog (lub suab), nrog rau cov ntaub ntawv los ntawm cov interfaces rau kev sib hloov ntawm cov hluav taws xob ntawm qhov ceev ntawm 64 kbps, Kev xa tawm ntawm cov kwj digital hla ib qho IP network / Ethernet thiab rau kev hloov cov kab teeb liab thiab lub cev cuam tshuam.
Siv cov cuab yeej zoo li no, koj tuaj yeem hloov mus txog 60 (hauv qee cov qauv no yuav muaj ntau dua) kev txiav tawm analog hauv 1 lossis 2 E1 kwj lossis 128 tus neeg siv rau plaub E1 kwj. Feem ntau, PM cov kab nrog hauv-band signaling ua raws li kev txiav tawm analog, lossis cov teeb liab tau siv rau ntawm ib qho kev sib cais. Lub suab channel cov ntaub ntawv tuaj yeem compressed txog 32 kbps lossis 16 kbps ibchannel, ADPCM encoding yog siv rau qhov no.
Cov multiplexers yooj yim tso cai rau koj siv kev tshaj tawm kev sib txuas, uas yog, pub cov teeb liab los ntawm ib qho ntawm cov digital lossis analog channel rau ntau lwm tus. Feem ntau siv los pub kev tshaj tawm xov xwm ib txhij mus rau ntau qhov chaw sib txawv.
Optical multiplexers yog cov cuab yeej tsim los ua haujlwm nrog cov ntaub ntawv ntws siv cov kab teeb pom kev sib txawv ntawm qhov amplitude lossis theem diffraction grating, nrog rau lub wavelength. Qhov zoo ntawm cov khoom siv no suav nrog kev tiv thaiv sab nraud, kev ruaj ntseg, kev tiv thaiv kev nyiag ntawm cov ntaub ntawv xa mus.
