Tag nrho DLS Technology yog Cov Asymmetric lossis Symmetric
DSL (Digital Subscriber Line) kev pabcuam hauv tsev kawm ntawv rau cov tsev thiab cov lag luam muaj nyob rau ntau qhov chaw ntawm lub tebchaws uas muaj cable thiab lwm yam kev pabcuam hauv online. DSL muab lub network siv xov tooj sib txuas nrog siv xov tooj tooj liab. Feem ntau ntawm cov kev pab cuam DSL yog cov asymmetric. Txhua hom kev pabcuam hauv DSL tau muab coj los ua ke xws li asymmetric lossis symmetric. Qhov kev pabcuam uas zoo tshaj rau koj yog nyob ntawm seb koj puas ua dej ntau lossis xav tau kev pabcuam rau kev sib sim suab thiab kev sib txuas lus video.
Asymmetric DSL
Asymmetric types of DSL txuas tau muab ntau lub network bandwidth mus downloading los ntawm qhov chaw muab kev pabcuam hauv internet rau tus neeg siv lub computer tshaj rau kev xa mus rau lwm yam kev taw qhia. Los ntawm kev txo cov nyiaj bandwidth muaj nyob rau sab nraud, cov neeg muab kev pabcuam muaj peev xwm muab ntau tshaj bandwidth downstream, uas qhia txog cov neeg siv cov neeg tau txais kev pab.
Asymmetric DSL tshuab yog nrov thaj chaw DSL cov kev pab uas cov neeg hauv tsev hauv internet feem ntau siv cov downstream bandwidth.
Cov ntaub ntawv ntawm Asymmetric DSL muaj xws li hauv qab no:
- ADSL (Asymmetrical Digital Subscriber Line) muaj qhov qis hauv siab txog 8 Mbps thiab ib qho nce siab ntawm 384 Kbps. Nws txhawb nqa cov kev pabcuam xovtooj thiab kev xa ntaub ntawv tib lub sijhawm.
- ADSL 2+ yog ib qho newer version of ADSL uas yuav pab muab kev download tau nce txog 20 Mbps thiab upload speeds txog li 850 Kbps.
- ADSL Lite los yog G.Lite yog ib tug version of ADSL uas muaj qeeb qeeb qis tshaj li 1 Mbps downstream ceev thiab 512 Kbps upload speed.
- R-ADSL (Tus Nqi-Adaptive Digital Subscriber Line) xa cov nqi sib txuas tib yam li ADSL, tiam sis kev sib kis ceev tau hloov los ntawm lub modem.
- VDSL (Tus Nqi Heev Siab Tus Naj Npawb Digital Subscriber Line) yog qhov kev pab DSL tshaj plaws. Nws muaj cov downstream cov nqi ntawm cov mus txog 52 Mbps thiab cov nqi ntaiv ntawm up to 2.3 Mbps tshaj ib qho tooj hlau xaim.
Lub DSL daim duab
Cov kab txuas ntawm DSL txuas tau qhov sib npaug ntawm cov khoom siv sib txuas thiab cov downloads. Kev siv DSM cov cuab yeej yog nrov rau cov lag luam-chav DSL cov kev pab cuam raws li cov tuam txhab feem ntau muaj ntau dua cov kev xav tau xa tawm cov ntaub ntawv. Nws kuj yog qhov kev xaiv ntawm kev xaiv suab paj nruag thiab kev sib txuas lus, uas yuav tsum muaj kev kub ceev hauv ob qho kev qhia rau kev sib txuas lus zoo.
Cov ntaub ntawv ntawm DSL zoo nkauj muaj xws li:
- SDSL (Symmetric Digital Subscriber Line) muaj kev sib npaug khiav thiab sib tshooj txuas mus txog 1.54 Mbps.
- SHDSL (Symmetrical High-Speed Digital Subscriber Line) yog tib yam li technology hauv SDSL, tiam sis ob qhov qauv tau txais kev pom zoo cais. SHDSL tau txais kev pom zoo los ntawm International Telecommunications Union, thiab SDSL tau pom zoo los ntawm European Telecommunications Standards Institute.
- HSDL (High Bit Rate Digital Subscriber Line) tau tsim nyob rau thaum ntxov xyoo 1990, ua rau nws yog ib tus qauv qub uas muaj teeb meem ntawm DSL. HDSL muaj cov ntaub ntawv txog 2.048 Mbps, tiam sis yuav tsum muaj ntau lub xov tooj, uas nws thiaj li ua rau nws dhau lawm.
Lwm hom DSL
IDSL (ISDN Digital Subscriber Line) yog cov tswv yim DSL / ISDN technology. Nws tau tsim nrog lwm hom DSL, tiam sis tsis siv niaj hnub no vim yog cov qis dua (144 Kbps tus nqi siab tshaj plaws) nws txhawb. IDSL muab ib txwm txuas rau kev twb kev txuas, tsis zoo li ISDN.