ADSL2 vs ADSL2+ (ADSL2 Plus)
ADSL (Asymmetric Digital Subscriber Line) yog ib txoj kab ruaj khov broadband, nws yog ib daim ntawv ntawm DSL. ADSL muaj kev nkag tau nrawm dua tib lub xov tooj tooj liab uas twb muaj lawm nyob rau tib lub sijhawm nrog xov tooj. Asymmetric txhais tau tias rub tawm bandwidth thiab upload bandwidth tsis zoo ib yam hauv ADSL. Nws tau tsim los ntawm kev xav txog tib neeg kev ua haujlwm hauv internet. Feem ntau cov neeg siv downloads ntau dua li uploads hauv Internet. ADSL ceev sib txawv ntawm 1 Mbps mus rau 20 Mbps nyob ntawm ntau yam tsis xws li qhov kev ncua deb ntawm tus neeg siv los ntawm DSLAM (Digital Subscriber Line Access Multiplexer, uas yog ib qho khoom siv uas txuas tag nrho cov neeg siv DSL) thiab kab mob.
ADSL2 (ADSL2 Annex A)
ADSL2 yog ib daim ntawv ntawm ADSL muab ntau bandwidth tshaj ADSL. ADSL2 yog hu ua ADSL2 annex A lossis ADSL2 xwb. Vim kev txhim kho cov txheej txheem hloov kho ADSL2 muaj nyob ib ncig ntawm 12 Mbps download bandwidth thiab 1 Mbps upload bandwidth. ADSL2 pib sai dua, siv sijhawm kwv yees li 3 vib nas this, thiab txuas sai sai.
ADSL2 txhawb nqa channelization yog li los ntawm kev faib 64kbps raws ntawm ADSL2, peb tuaj yeem thauj cov suab teeb liab ncaj qha ntawm DSL los ntawm kev siv PCM kev hloov pauv. Cov neeg muab kev pabcuam tuaj yeem muab lub suab thiab cov ntaub ntawv daws teebmeem ntawm ADSL2.
ADSL2+ (ADSL2 Plus)
ADSL2+ yog tiam tom ntej ADSL thev naus laus zis los muab kev siv siab bandwidth siv tib cov kab tooj. ADSL2+ tau tshaj tawm hauv xyoo 2003 thiab nws yog tus qauv ITU g992.5.
ADSL2+ siv ob zaug ntawm qhov zaus ntawm ADSL2 (2.2MHz) yog li rub tawm cov ntaub ntawv tus nqi tau nyob ib puag ncig 24 Mbps. ADSL2+ upload ceev tseem nyob li 1Mbps.
In luv luv, ADSL2+ zoo dua ADSL2 hauv kev nkag mus ceev tab sis tsis tau txhais hais tias koj tuaj yeem xauj internet sai dua hauv ADSL2+ dua ADSL2. Muaj ntau ntau lwm yam uas cuam tshuam qhov ceev los yog throughput.
Summary:
ADSL2 tuaj yeem muab max mus txog 12 Mbps thiab ADSL2+ tuaj yeem muab qhov kev xav tau 24 Mbps. Tab sis txhua tus yuav tsum nkag siab tias qhov sib txawv ntawm qhov ceev, bandwidth thiab throughput yog dab tsi. Tag nrho cov ceev peb tham 12M, 24M, 2M yog cov kab nrawm lossis koj tuaj yeem hais kom nkag mus ceev. Qhov no tsis tau lees tias koj tuaj yeem nkag tau internet ntawm qhov nrawm.
ADSL yog kev siv thev naus laus zis los muab kev sib txuas dav dav rau koj los ntawm cov chaw muab kev pabcuam. Txawm hais tias koj muaj 24 Mbps ADSL2+ ntawm koj qhov kawg, tus neeg muab kev pabcuam yuav tsis txuas koj mus rau hauv internet qaum ntawm tib qhov ceev. Lawv muaj qhov piv txwv hu ua kev sib cav sib ceg, uas yooj yim peb tuaj yeem hais, 100 ADSL2+ (24 Mbps) cov neeg siv khoom yuav txuas nrog 24 Mbps hauv internet qaum. Yog li kev sib txuas hauv Is Taws Nem rov qab yuav raug sib koom ntawm 100 tus neeg siv khoom yog tias tag nrho 100 tus neeg siv khoom siv internet tib lub sijhawm. Qhov no yog ib txoj kev xav dav dav thiab txawv ntawm lub tebchaws mus rau ib lub tebchaws. Hauv qee lub tebchaws lawv tsis siv qhov sib cav sib ceg hloov lawv cov pob khoom loj li 20 GB ib hlis thiab tej zaum yuav sib xyaw ntawm ob qho tib si.
Feem ntau ADSL, ADSL2 thiab ADSL2+ (ADSL2 Ntxiv) nrawm nyob ntawm cov hauv qab no:
(1) Qhov deb ntawm Kev Sib Tham Xov Tooj (ADSL2+ pib los ntawm 24 Mbps los ntawm kev sib pauv thiab nws yuav nqis mus rau 2 Mbps hauv 5.5 Km nrug uas ADSL nws tus kheej yuav muab)
(2) Kab mob ntawm koj txoj kev sib txuas tooj liab
(3) Kab Profile muab rau koj los ntawm Tus Muab Kev Pabcuam (Cov chaw muab kev pabcuam muaj cov kab sib txawv rau cov pob sib txawv)
(4) Sab nraud hluav taws xob cuam tshuam rau koj tus khub tooj liab
(5) Tus Muab Kev Pabcuam Hauv Is Taws Nem Bandwidth ntawm lub nraub qaum sab
(6) Lub hom phiaj neeg rau zaub mov bandwidth thiab kev ua haujlwm. (Piv txwv: Thaum koj nkag mus rau www.yahoo.com, tus neeg rau zaub mov uas www.yahoo.com yog tuav thiab kev sib txuas bandwidth, thiab kev siv bandwidth thiab kev ua haujlwm server kuj yuav cuam tshuam rau koj cov khoom siv)
Ib lub ntsiab lus tseem ceeb, kuv xav piav qhia ntawm no, xav tias ADSL2 thiab ADSL2+ zoo li 20 txoj kab kev loj uas tsis txhais tau tias koj tuaj yeem ya tau. Koj tuaj yeem tsav tsheb hauv 120 Km / hr hauv txoj kev 6 txoj kab thiab. Nyob rau tib lub sijhawm koj tsuas tuaj yeem tsav 120 ntawm txoj kab 20 txoj kab. Yog li qhov txawv li cas?
Qhov saum toj no muaj tseeb, tab sis hauv 20 txoj kab kev loj koj tuaj yeem tsav 20 lub tsheb hauv 120 Km / hr whereas hauv 6 txoj kab kev loj koj tsuas tsav tau 6 lub tsheb hauv 120 Km / hr. Yog li thaum koj siv ntau daim ntawv thov hauv koj lub computer xwb koj tuaj yeem hnov qhov sib txawv ntawm ADSL2 lossis ADSL2+. Hauv cov ntsiab lus, koj yuav tsum tsim ntau TCP, UDP ntu (Ex: Nws yuav sai dua rau rub tawm cov ntaub ntawv nrog rub tawm nrawm dua li rub tawm ntawm ib qho FTP rub tawm lossis rub tawm ib txwm).
Qhov txawv ntawm ADSL2 thiab ADSL2+ (ADSL2 Ntxiv), ib daim ntawv qhia ceev:
(1) ADSL2 thiab ADSL2+ yog cov thev naus laus zis zoo sib xws uas muaj kev siv internet ceev ceev.
(2) ADSL2 tuaj yeem muab max mus txog 12 Mbps whereas ADSL2+ tuaj yeem mus txog 24 Mbps.
(3) Rau ADSL2 thiab ADSL2+, Wi-Fi routers tuaj yeem siv.
(4) ADSL2+ routers tuaj nrog built-in Wi-Fi thiab VoIP.
(5) ADSL2+ yog qhov zoo tshaj plaws siv thev naus laus zis hla cov kab tooj liab tam sim no.
