Circuit Switching vs Packet Switching
Circuit Switch (CS) thiab Packet Switch (PS) yog ob hom sib txawv ntawm kev hloov chaw xa cov ntaub ntawv thiab cov lus los ntawm ib qho mus rau lwm qhov. Hauv kev sib txuas lus, kev hloov hluav taws xob yog thawj txoj kev siv los xa lub suab thiab cov ntaub ntawv. Tom qab cov evolution ntawm pob ntawv hloov chaw, cov ntaub ntawv ib feem ntawm kev sib txuas lus yog sib cais los ntawm circuit switch domain. GPRS thiab EDGE yog thawj theem ntawm pob ntawv hloov pauv hloov pauv hloov pauv. Nrog rau kev tso tawm ntawm 3G tes hauj lwm, qee qhov kev sib txuas lus hauv lub suab pib ntws los ntawm pob ntawv hloov network, thiab kev hloov hluav taws xob tsis tseem ceeb. Circuit switched domain yog tag nrho hloov mus rau pob ntawv hloov los ntawm qhov tseeb 3GPP tshaj tawm xws li R9 thiab R10, qhov twg tag nrho cov suab sib txuas lus siv tau siv VoIP cov kev pabcuam uas khiav ntawm pob ntawv hloov chaw.
Circuit Switching yog dab tsi?
Kev hloov hluav taws xob tau pib siv hauv kev sib txuas lus, hloov ntau txoj hauv kev kom tib neeg tuaj yeem sib txuas lus. Hauv kev hloov hluav taws xob, txoj kev txiav txim siab thiab mob siab rau ua ntej cov ntaub ntawv xa tawm tiag tiag pib. Rau tag nrho qhov ntev ntawm kev sib txuas lus ntawm ob lub ntsiab lus kawg, bandwidth thiab lwm yam kev pabcuam raug kho thiab mob siab rau, uas tsuas yog tso tawm thaum qhov kev sib tham xaus. Vim qhov kev mob siab rau ntawm cov channel hauv kev hloov pauv hauv Circuit Court, nws tuaj yeem muab kev lees paub QoS los ntawm qhov kawg mus rau qhov kawg, uas muab ntau qhov tsim nyog rau lub sijhawm siv sijhawm xws li lub suab thiab video. Tsis tas li ntawd, kev txiav txim ntawm cov lus xa los ntawm qhov chaw yuav tsis raug hloov ntawm qhov chaw thaum nws mus ntawm kev hloov pauv hauv lub network. Qhov no kuj ua rau kev ua haujlwm tsawg dua ntawm qhov chaw kom rov tsim cov lus qub.
Packet Switching yog dab tsi?
In Packet Switch networks, cov lus tau tawg mus rau hauv cov ntaub ntawv me me, uas raug xa mus rau qhov chaw tsis muaj kev cuam tshuam ntawm ib leeg. Txoj hauv kev los ntawm qhov chaw mus rau qhov chaw yog tswj hwm los ntawm tus lej ntawm cov txheej txheem, qhov kev sib txuas ntawm cov pob khoom yog tswj hwm los ntawm kev hloov chaw lossis routers. Txhua pob ntawv pom nws txoj hauv kev nyob ntawm qhov chaw thiab qhov chaw nyob thiab chaw nres nkoj. Txij li thaum txhua pob ntawv raug kho nyias nyob rau hauv pob ntawv hloov cov tes hauj lwm, pob ntawv tau sau npe nyob rau hauv ib txoj kev kom cov lus qub tuaj yeem rov tsim dua ntawm qhov chaw txawm tias cov pob ntawv tseem tsis tau tuaj txog ntawm qhov chaw nyob hauv thawj qhov kev txiav txim lawv tau xa los ntawm qhov chaw.. pob ntawv hloov chaw yuav tsum tau tswj xyuas kom zoo nrog QoS qib kom thiaj li nqa tau cov tsheb khiav hauv lub sijhawm xws li lub suab thiab cov kwj video.
Dab tsi yog qhov txawv ntawm Circuit Switch thiab Packet Switch?
Thaum pib, pob ntawv hloov pauv tau siv dav rau kev sib txuas lus cov ntaub ntawv thiab kev hloov pauv hauv lub network tau siv rau kev sib txuas lus. Txawm li cas los xij, txhim kho QoS nqis hauv pob ntawv hloov pauv tau nyiam lub suab sib txuas lus rau hauv pob ntawv hloov pauv tsis ntev los no. Nyob rau hauv pob ntawv hloov tes hauj lwm, bandwidth tuaj yeem siv rau nws lub peev xwm tag nrho, thaum nrog kev siv hluav taws xob hloov hluav taws xob siv bandwidth yuav tsis muaj txiaj ntsig vim tias txhua qhov kev sib txuas lus yuav tsum muaj lub siab bandwidth txawm tias nws siv los yog tsis siv. Muaj peev xwm muaj ntau dua nyob rau hauv pob ntawv Hloov tes hauj lwm txij li txhua pob ntawv raug xa mus siv nws qhov chaw nyob, whereas nrog circuit switch networks nws yog predefined.
Packet hloov cov tes hauj lwm tuaj yeem sib koom thaum cov neeg siv ntau ntxiv, qhov kev hloov hluav taws xob hauv hluav taws xob raug txwv los ntawm ntau tshaj plaws ntawm cov channel muaj. Thaum kev siv ntau tshaj li ib theem, cov kev txwv tsis pub dhau yuav pom hauv pob ntawv hloov pauv, thiab cov pob ntawv yuav raug ncua, thiab kev siv qee cov kev pabcuam hauv lub sijhawm yuav tsis muaj nuj nqis. Ntawm qhov tod tes, nrog rau lub voj voog hloov chaw, cov neeg siv tsis tuaj yeem tshaj qhov ntau ntawm cov kev sib txuas muaj nyob hauv lub network. Yog li ntawd, yuav tsum tau ua kom zoo rau lub sij hawm tiag tiag daim ntaub ntawv yuav tau yooj yim tswj nyob rau hauv ib tug Circuit Court hloov kev twb kev txuas. Tsis tas li ntawd, kev txiav txim ntawm cov lus xa yuav tsis raug hloov pauv thaum dhau los ntawm kev hloov pauv hauv lub network, whereas, nrog pob ntawv hloov network, tsis muaj qhov lav zoo. Vim qhov no tau lees paub thiab txhim khu kev qha ntawm Circuit Court hloov chaw, kev ua haujlwm ntawm qhov chaw thiab qhov chaw yuav tsawg dua thaum piv nrog cov txheej txheem nyuaj uas yuav raug siv los rov qab cov ntaub ntawv hauv pob ntawv hloov network.
Circuit switch networks tsim nws tus kheej muab kev lees paub kawg rau QoS, thaum nyob rau hauv pob ntawv hloov chaw QoS yuav tsum tau ua. Packet switch domains muab kev siv ntau dua ntawm cov peev txheej vim muaj qhov sib koom hauv cov tes hauj lwm, qhov chaw hloov hluav taws xob tsis zoo vim muaj kev mob siab rau lub network.
