Chiyambi cha kusiyana pakati pa PCM multiplexing zida ndi PDH zida

Choyamba, zida za PCM ndi zida za PDH ndizosiyana kotheratu.PCM ndi zida zophatikizika zopezera ntchito, ndipo zida za PDH ndi zida zowunikira.

Chizindikiro cha digito chimapangidwa ndi sampuli, quantizing ndi encoding mosalekeza kusintha chizindikiro analogi, amene amatchedwa PCM (pulse code modulation), ndiko kuti, pulse code modulation.Mtundu uwu wa chizindikiro chamagetsi chamagetsi amatchedwa chizindikiro cha digito baseband, chomwe chimapangidwa. ndi chotengera chamagetsi cha PCM.Makina otumizira ma digito apano onse amagwiritsa ntchito pulse-code modulation (Pulse-code modulation).PCM sinagwiritsidwe ntchito potumiza deta yapakompyuta, koma kukhala ndi thunthu pakati pa masiwichi m'malo mongotumiza chizindikiro cha foni.

JHA-CPE8-1

Zida zotumizira zamagetsi za PDH, mu njira yolankhulirana ya digito, ma siginecha omwe amatumizidwa ndi ma digitized pulse sequences.Mitsinje yamasigino a digitoyi ikafalikira pakati pa zida zosinthira digito, mitengo yawo iyenera kukhala yogwirizana kwathunthu kuti zitsimikizire kulondola kwa kufalitsa chidziwitso.Izi zimatchedwa "synchronization."Mu njira yotumizira digito, pali mitundu iwiri yotumizira digito, imodzi imatchedwa "Plesiochronous Digital Hierarchy" (Plesiochronous Digital Hierarchy), yofupikitsidwa ngati PDH;ina imatchedwa "Synchronous Digital Hierarchy" (Synchronous Digital Hierarchy), yofupikitsidwa monga SDH.

Ndi chitukuko chofulumira cha mauthenga a digito, pali mauthenga ocheperapo ndi ochepa, ndipo mauthenga ambiri a digito ayenera kusinthidwa.Chifukwa chake, mndandanda wa PDH sungathe kukwaniritsa zosowa zamabizinesi amakono olumikizana ndi ma telecommunication komanso zosowa zamakanema amakono owongolera ma network..SDH ndi njira yotumizira yomwe yatulukira kuti ikwaniritse zosowa zatsopanozi.


Nthawi yotumiza: Jul-19-2021