Yuav ua li cas yog switching raws?

Tag nrho cov tam sim no uas twb muaj lawm telecommunications tes hauj lwm los muab qhov yuav tsum tau kev tso cai yuav siv tau ob hom ntawm kev twb kev txuas - Circuit Court switching, thiab (los yog) tej pob khoom. Yuav ua li cas yog nws thiab ua li cas lawv txawv los ntawm txhua lwm yam?

Peb pib nrog, yuav ua li cas rau hauv Circuit Court-hloov network. Lawv nyob ua ntej lawv cov counterparts nrog switching packets, yog li ntawd, tsis ceeb, ntau yooj yim rau siv. Ib tug piv txwv ntawm ib tug network uas siv Circuit Court switching - ib tug xov tooj link. Nws yog pom tseeb tias nyob rau hauv thiaj li yuav tso cai rau ob tug neeg yuav muaj peev xwm pib ntaub thiab sib tham, koj yuav tsum tsim kom muaj ib tug kev twb kev txuas ntawm lawv. Cov neeg yuav-initiator dials ib tug xov tooj, uas yog ua tau ib pab neeg ntawm cov khoom rau hauv xov tooj noj (ATS) nyob nruab nrab ntawm lawv, kom txuas lub ob kab - los ntawm lub initiator thiab tus neeg teb (coj ib tug piv txwv uas cov neeg rau npe yuav tau txais kev pab los ntawm ib tug chaw nres tsheb). Yav tas los, qhov no thov cov neeg kho tshuab feelers rau tej yam yooj yim txoj hauj lwm sensors, ces, nrog lub advent ntawm cov kev daws teeb meem, qhov kev siv ntawm kev hloov, tab sis lub hauv paus ntsiab lus tseem zoo li qub. Circuit Court switching muab subscribers nrog ib tug neeg sab nraud kab, uas tseem muab rau lawv txog rau thaum xaus ntawm qhov kev sib kho. Qhov zoo yog cuab kev: siab cia siab rau, tsis muaj yuav tsum tau rau cov kis ntawm cov tswj packets. Txawm li cas los, qhov no txoj kev tebchaw nrog cov xov tooj ntawm cov neeg rau npe yuav dhau wasteful, txij li thaum lub xov tooj ntawm raws yog lub cev xwb. Txawm cov los kom daws tau qhov teeb meem no siv rau tsiaj hiav txwv tsuas yog ib ntus kev ntsuas, tej yam nruab nrab tov. Tsis tas li ntawd, Circuit Court switching muaj ib tug loj drawback - lub sib txuas lus txoj kab yog tibneeg hu tauj coob tag nrho cov sij hawm txawm yog hais tias muaj yog tsis txauv ntawm cov ntaub ntawv ntawm cov neeg rau npe. Piv txwv li, thaum lub sij hawm ib tug xov tooj sib tham, koj yuav dai li ib ncig ntawm lub computer thiab mus txog lawv ua lag ua luam - channel yuav tseg rau lawv kom txog thaum lub teeb liab mus rau cov link.

Uas yog vim li cas tom qab hloov commutation raws tuaj txoj kev uas yuav tuaj rau lawv switching. Nws lub lag luam yuav encoding thiab partitioning kis cov ntaub ntawv kwj mus rau hauv ib tug xov tooj ntawm ib tug neeg packets uas yog raws li nyob rau hauv tag nrho cov link receiver yog kis tau thiab muaj cov chav hauv ib tug pub kwj. Yuav kom to taub qhov sib txawv ntawm ob txoj kev, peb yuav siv cov analogy ntawm cov thauj kab: thaum Circuit Court switching kab yog sawv cev los ntawm ib tug kev tsheb nqaj hlau khiav, thiab cov ntaub ntawv txaus - yog cov muaj pes tsawg leeg ntawm ib tug ntau yam ntawm lub tsheb. Nws yog ib heev ntshiab tias txoj kev ncua raws li yog tsis tshua muaj heev, thiab cov kev ntseeg ntawm ib qho ntawm lub siab tshaj plaws. Nyob rau tib lub sij hawm, nyob rau hauv no khiav nyob rau tib lub sij hawm yuav tsis txav ib ob peb ntau. Tab sis cov kab ntawm pob ntawv switching - ib tug high-ceev txoj kev loj nrog ib tug multiband zog. Lub cargo (transmitted packets) yog muab faib ua ob peb tshuab uas yog tacking nyob rau hauv lub khiav ntawm lwm hom kev thauj, ncav cuag lawv cov lo lus uas peb, qhov twg los ua ke ntawm tus thawj tsim. Nyob rau hauv qhov kev piv txwv, txoj kev - ib tug kev sib txuas lus channel, thiab cov cav tov cov ntaub ntawv packets. Lawv pa roj carbon monoxide nyob ua ib ke peacefully rau tib txoj kev, yuav luag tsis muaj cov teeb liab ntsais nrog txhua lwm yam movements. Tshwj - congestion, tsheb teeb thiab txawv txav lub sijhawm (qhov no ncua). Txawm hais tias ib lub tshuab yog tsis tuaj txog ntawm cov lo lus uas, ib daim qauv ntawm qhov kev thov yuav tsum xa dua. Tag nrho cov ntim kis ib chav tsev thaum pob sij hawm cov ntaub ntawv yog ho siab tshaj nyob rau hauv cov ntaub ntawv ntawm raws.

Nyob rau hauv kev, switching yog hloov dab tsi hloov lub xeev. Nyob rau hauv ib tug network txheej txheem nws cov ntaub ntawv ib tug txoj kev rau cov ntaub ntawv rau traverse. Lub peculiarity lus dag nyob rau hauv txoj kev ntawm nws lub koom haum. Switching yog tsis tsim nyog tsis mus yuav tsis meej pem nrog lub routing hauj lwm yog los nrhiav cov pom lawv.