Kev paub

Thaum peb xa cov teeb liab, txawm tias nws yog lub teeb liab kho qhov muag, lub teeb liab hluav taws xob, lossis lub teeb liab wireless, yog tias nws raug xa ncaj qha, lub teeb liab tau yooj yim cuam tshuam los ntawm lub suab nrov, thiab nws nyuaj rau kom tau txais cov ntaub ntawv raug thaum kawg tau txais. Txhawm rau txhim kho kev tiv thaiv kev cuam tshuam abilit ...

Cov qauv yooj yim ntawm binary digital modulation yog: Binary amplitude keying (2ASK) - amplitude hloov ntawm lub teeb liab nqa; Binary zaus hloov keying (2FSK) - zaus hloov ntawm cov teeb liab nqa; Binary theem hloov pauv keying (2PSK)-theem hloov ntawm cov teeb liab cov cab kuj. Differential theem hloov keyin...

Lub PON system txais kev siv lub sij hawm faib multiplexing technology nyob rau hauv uplink kev taw qhia, thiab ONU xa datagrams mus rau uplink kev taw qhia raws li lub sij hawm stamp faib los ntawm lub OLT. Thaum ONU tso tawm lub teeb yam tsis tau muab lub sijhawm thwj, nws yuav cuam tshuam nrog cov teeb liab tawm ntawm lwm yam ntawm ...

Nrog rau kev txhim kho ntawm kev sib txuas lus kho qhov muag nrog kev ncua deb, muaj peev xwm loj dua, thiab kev nrawm dua, tshwj xeeb tshaj yog thaum cov nthwv dej ib leeg hloov zuj zus los ntawm 40g mus rau 100g lossis txawm tias super 100g, chromatic dispersion, nonlinear cuam tshuam, polarization hom dispersion, thiab lwm yam kev sib kis hauv. ..

Kev kuaj xyuas yuam kev (parity check code): parity check code muaj n-1 ntsis ntaub ntawv chav tsev thiab 1 ntsis kos lub caij. N-1 ntsis ntaub ntawv chav tsev yog cov ntaub ntawv siv tau nyob rau hauv cov ntaub ntawv peb xa, thiab 1-ntsis check unit yog siv rau kev ua yuam kev thiab redundancy code. Odd check: yog tias n...

Nyob zoo, nyeem. Hauv tsab xov xwm no kuv yuav tham txog OSI-Data Link Layer Error Control nrog kev piav qhia. Cia peb pib… Rau kev nkag siab txog kev sib kis ntawm cov ntaub ntawv txuas txheej cia peb ua piv txwv, yog tias A ntaus ntawv xav tau kev sib txuas lus nrog B ntaus ntawv, kev sib txuas lus txuas ...