Kuv Yuav Tsum Muaj Ntau Npaum Li Cas Rau VoIP?
Bandwidth yog sib txuas nrog kev txuas ceev, tab sis technically lawv tsis yog tib yam nkaus. Bandwidth yog, qhov tseeb, qhov ntau ntawm frequencies los ntawm cov ntaub ntawv xa mus. Tib co cai siv rau xov tooj cua, TV thiab cov ntaub ntawv sib kis. Ib qhov loj tshaj 'ntau' txhais tau hais tias ntau cov ntaub ntawv kis tau los ntawm ib qho taw tes rau hauv lub sij hawm, thiab yog li ceev dua. Txawm hais tias peb yuav siv ob nqe lus sib hloov ntawm no, technically bandwidth tsis yog qhov txuas ceev, txawm tias lawv siv los cuam tshuam los ntawm feem ntau cov neeg siv Internet.
Ntsuas Bandwidth
Bandwidth yog ntsuas hauv Hertz (Hz), los yog MegaHertz (MHz) vim Hertz raug suav hauv tsheej lab. Ib tug MHz yog ib lab Hz. Kev sib txuas ceev (technically hu ua nqi me ntsis) yog ntsuas hauv Kilobits thib ob (kbps). Nws tsuas yog ib qho kev ntsuas seb muaj pes tsawg cov khoom sib kis tau hauv ib qho thib ob. Kuv yuav siv kbps los yog Mbps xa mus rau kev sib kis ceev txij tam sim no rau vim tias txhua tus neeg muab kev pab cuam tham txog thaum hais txog kev ceev lawv muab. Ib tug Mbps yog ib txhiab kbps.
Koj tuaj yeem muaj ib lub tswv yim zoo npaum li cas los sis koj qhov kev sib txuas yog qhov twg thiab seb nws yog tsim rau VoIP los ntawm kev sib tw hauv online. Nyeem ntxiv txog kev sib txuas sib txuas ntawm no.
Bandwidth Nqi
Rau feem coob ntawm cov neeg siv Internet hauv kev sib txuas lus nruab nrab, bandwidth tshwm sim los ua tus nqi kim tshaj plaws, vim hais tias nws rov muaj dua. Rau kev sib txuas lus ntawm lub suab, qhov kev xav tau ntawm bandwidth yog qhov tseem ceeb tshaj, vim hais tias lub suab yog ib yam ntaub ntawv uas yog barker dua pa text.
Qhov no txhais tau hais tias ntau dua qhov kev txuas ceev, zoo dua lub suab zoo uas koj tuaj yeem tau txais. Niaj hnub no, txoj kev sib txuas hauv broadband yog hom tham thiab pheej yig dua thiab pheej yig dua.
Broadband yog ib qho kev sib txuas ntawm kev sib txuas (24 xuab moos tauj ib hnub thiab kom ntau npaum li koj xav siv) ntawm kev ceev ntau dua qhov kev dial-up tus 56 kbps.
Feem ntau cov kws kho mob muab tsawg kawg yog 512 kbps hnub no, uas yog qhov zoo txaus rau VoIP kev sib txuas lus. Qhov no yog cov ntaub ntawv rau tsim lub teb chaws thiab cheeb tsam. Rau lwm qhov chaw, qee cov neeg siv kuj tseem txwv tsis pub qis dua kev sib txuas ntawm cov nqi siab.
Hom Bandwidths
Peb tau saib ntawm qee qhov kev hloov pob zeb txuas nrog cov kev sib txuas lus nrov thiab yees.
| Tshuab | Ceev | Siv hauv VoIP |
| Dial-Up (Modem) | Mus txog 56 kbps | Tsis haum |
| ISDN | Mus txog 128 kbps | Haum, kev pabcuam ruaj khov thiab muaj nplooj siab |
| ADSL | Mus txog ob peb Mbps | Ib qho ntawm WAN zoo tshaj plaws, tab sis tsis muaj kev yoo mov |
| Wireless yees (xws li WiFi, WiMax, GPRS, CDMA) | Mus txog ob peb Mbps | Qee cov cuab yeej tsim muaj thaum qee qhov tsuas yog kev sib nraus thiab qhov teeb meem zoo nkaus xwb. Lawv yog cov kev cawm mobile rau ADSL. |
| LAN (xws li Ethernet ) | Mus txog txhiab tus Mbps (Gbps) | Qhov zoo tshaj plaws, tab sis tsuas yog siv rau qhov ntev ntawm cov xov hlau uas luv tau feem ntau. |
| Cable | 1 mus rau 6 Mbps | Kev kub ceev tab sis tsis muaj kev txwv. Yog tsim nyog koj tsis tas yuav tsiv mus. |
Bandwidth thiab Apps
VoIP apps ntawm koj lub xov tooj txawb kom zoo dua. Qhov no yog raws li cov codecs lawv siv los encode cov ntaub ntawv rau kis thiab lwm yam kev xav txog kev xav. Skype, Piv txwv, yog cov VoIP apps uas haus cov ntaub ntawv ntau dua lossis bandwidth ib feeb ntawm kev sib txuas lus, raws li nws muaj lub suab HD.
Yog li, thaum qhov zoo tshaj plaws zoo dua, koj yuav tsum tau muaj kev tshaj bandwidth thiab siv ntau dua nyob rau hauv cov nqe lus ntawm megabytes. Qhov no zoo rau WiFi, tab sis koj yuav tsum nco ntsoov txog nws thaum siv koj cov ntaub ntawv xov tooj. Nyeem ntxiv rau mobile ntaub ntawv noj.