ADSL - yog dab tsi? Lub hauv paus ntsiab lus ntawm lub lag luam, lub siab tshaj plaws ceev, qhov zoo thiab qhov tsis zoo ntawm cov ADSL technology

ADSL - ib tug technology ib tug asymmetric nkag tau mus rau hauv Internet. Nws yog structurally asymmetric thiab lub kaw lus yuav ua hauj lwm nrog rau ib tug ceev ntawm lub tebchaw, xeeb mus txog 8 Mbit / s. ADSL-technology, uas yog xam kis tau tus mob npaum li cas mus rau 1 Mbit / s, ua hauj lwm nyob rau ntawm ib tug nruab nrab deb ntawm 5 km. Niaj hnub no peb saib zoo li cas ntawm kev twb kev txuas yam thiab yuav ua li cas nws ua hauj lwm.

Cov zaj dab neeg ntawm

Ua ntej teb cov lus nug: "? ADSL - dab tsi nws yog," peb coj mus rau koj cov xim ib tug me ntsis ntaub ntawv keeb kwm. Rau cov thawj lub sij hawm creation ntawm high-ceev kev sib txuas tham nyob rau hauv lub lig '80s, thaum lub Internet txawm nyob rau hauv nws cov niaj hnub daim ntawv tsuas yog ib tug xav xav tau. Nws tseem ceeb ua hauj lwm nyob rau hauv 1989 yog cov kev txhim kho thiab Modernization ntawm cov ntaub ntawv kis tau tus mob technology tshaj tooj liab xov tooj nyob ntawm tej. Analog-rau-digital hloov dua siab tshiab yog tsim mas rau lub ceev ceev kis tau tus mob ntawm cov ntaub ntawv ntawm lub ntau yam sib tham sib pab, video ua si, video ntaub ntawv, raws li tau zoo raws li rau muab instant tej thaj chaw deb mus rau lub LAN thiab lwm yam network systems.

Niaj hnub nimno ADSL-technology: cov ua hauj lwm hauv paus ntsiab lus

Action network yog raws li nyob rau hauv cov neeg kab tias raws telephony muab kev nkag tau mus rau hauv Internet. Tab sis lub xov tooj kab siv ib tug analog teeb liab rau lub suab lus. ADSL-kev twb kev txuas yog tsim los kom cov analog teeb liab yog hloov dua siab tshiab rau cov thiab xa nws ncaj qha mus rau ib tug computer. Nyob rau tib lub sij hawm, nyob rau hauv sib piv rau lub twb dhau caij nyoog Dial-up modems, ADSL-raws li pab kiag li lawm tsis thaiv lub xov tooj kab thiab tso cai rau cov kev siv ntawm cov thiab analog Pib ntsais koj teeb ib txhij.

Lub essence ntawm technology (asymmetric) yog hais tias lub neeg yuav tau txais ib tug lossis loj npaum li ntawm cov ntaub ntawv - cov khoom tsheb, thiab los ntawm nws tus kheej qhia ib yam tsawg kawg nkaus ntawm cov ntaub ntawv - cov downstream tsheb. Raws li ib qho khoom meant tag nrho cov xaiv ntawm cov ntsiab lus: video thiab xov xwm ntaub ntawv, ntaub ntawv sau npe, cov kev pab cuam, graphics khoom. Nqis xa tsuas ib qho tseem ceeb kev ntaub ntawv - ntau yam commands thiab queries, emails, thiab lwm yam me yam khoom. Lub asymmetry yog tias tus nqi ntawm network rau neeg yuav yog ob peb lub sij hawm ntau dua ceev los ntawm tus neeg siv.

Qhov tseem ceeb tshaj kom zoo dua muaj los ntawm lub ADSL-technology yog nws nyiaj txiag thiab efficiency. Lub fact tias cov system siv tib yam tooj liab xov tooj nyob ntawm tej. Tus nab npawb ntawm cov officers nyob rau hauv lawv, ntawm chav kawm, zoo heev tshaj tus xov tooj ntawm zoo xws li cov ntsiab nyob rau hauv cable modems. Tab sis nyob rau tib lub sij hawm yuav tsis tau ua tej yam Modernization ntawm switching cov khoom thiab complex reconstruction. ADSL yog kev cob cog rua ceev thiab niaj hnub hom modems yog intuitive khiav lag luam thiab kho.

Yuav ua li cas cov khoom yog siv rau qhov no kev twb kev txuas?

Nyob rau hauv kev txiav txim rau lub tshuab ua hauj lwm, siv tshwj xeeb hom modems, uas txawv nyob rau hauv lawv cov qauv, tsim, hom kev twb kev txuas:

• PCI-modems (internal computer pab kiag li lawm).
• Sab nraud modems nrog lub hom USB kev twb kev txuas.
• Devices nrog Ethernet interface hom.
• Router, routers nrog Ethernet Circuit Court.
• Tshwj Xeeb hom modems (rau ruaj ntseg tuam txhab uas muag, lwm lub xov tooj kab).
• Router nrog nrog cov ntsiab lus ntawm Wi-nkaus saib.

Ntxiv khoom: splitters thiab microfilters

Peb yuav tsum tsis txhob hnov qab tias rau kev twb kev txuas ntawm xws li ib tug gadget li ib tug ADSL-modem, splitters thiab microfilters yuav tsum tau. Devices raug xaiv nyob rau hauv raws li cov qauv siv los ntawm tus xov tooj cable. Nyob rau hauv cov teeb meem uas cov cable qhov hluav taws xob yog ua (los yog yuav nqa tawm) yaj channel modem thiab xov tooj splitter siv. Nyob rau hauv cov ntaub ntawv yog, koj xav mus yuav ib tug microfilter, uas yog ntsia tau rau txhua txhua lub xov tooj uas yog tam sim no nyob rau hauv lub chav tsev.

Lub ntsiab hauj lwm ntawm lub splitter yog mus rau faib lub zaus - lub suab (0,3-3,4 kHz) thiab thov ncaj qha los ntawm modem (25 KHz-1.5 MHz). Nws yog nyob rau hauv no txoj kev yog muab cov simultaneous kev ua tau zoo ntawm cov modem thiab lub xov tooj uas tsis cuam tshuam nrog txhua lwm yam thiab tsis cuam tshuam. Splitters yog compact thiab tsis ua ruaj txaav. Tej yam me me thawv yog txawm peem rau nrog peb terminals thiab muaj ib tug uas tsis muaj ceeb thawj.

ADSL - yog dab tsi? Cov kauj ruam rau txuas high-ceev Internet

1. Qhov kev xaiv ntawm kws kho mob. Yuav kom siv tau qhov no technology thaum lub caij txhua lub chaw kho mob muaj. Ntau hom thiab cov nqi sib txawv los ntawm cheeb tsam, raws li zoo raws li cov kev muaj peev xwm ntawm lub tuam txhab uas kev pab them nqi tej zaum yuav tsawg.
2. Yuav khoom ntawm cov khoom. Tam sim no, nws yog tsis tsim nyog mus yuav ib tug modem, router, router, splitter thiab microfilter. Thaum ua ib tug ntawv cog lus rau txuas tus kws kho mob muaj siv sijhawm khoom rau nqi xauj tsev, nrog rau ib qho ADSL-modem. Afterwards, thaum txiav ntawm daim ntawv yog xa rov qab cov khoom. Cov neeg them tsuas yog rau cov Internet kev twb kev txuas. Niaj hnub nimno Internet ADSL - yog dab tsi? Qhov no yog ib tug ceev, pheej yig thiab high-zoo txoj kev mus cuag.
3. Account kom. Rau txhua tus neeg zov me nyuam reserves account, kom cov uas muaj peev xwm coj mus rau 12 hnub. Txawm li cas los, nyob rau hauv Feem ntau, lub cev network kev pab them nqi ntawm cov txheej txheem tsis tau ntau tshaj li ob peb teev. Pre-check xov tooj muab kev pab kom tau ADSL kev twb kev txuas. Yog hais tias lub tshuab yog tsis txaus nkag cheeb tsam, ces ib tug high-ceev Internet yuav tsis ua hauj lwm.
4. Teem tau cov khoom. Rau ntawm no theem, cov kev twb kev txuas ntawm pab kiag li lawm rau tus xov tooj kab splitter thiab micro los ua ke, installation ntawm modem tsav tsheb rau koj lub computer, raws li zoo raws li seeb lub network tej chaw ntawm lub modem nyob rau hauv lub web browser.

goodies

Uas muaj qhov zoo ntawm ADSL-technology? Ntawm no yog ib co ntawm lawv:

• High ceev cov ntaub ntawv kis tau tus mob. ADSL tso cai rau koj yooj yim mus rau cov hloov ntaub ntawv ntawm kev loj tsis muaj ib tug ntev tos. Cov cuab yeej no yog lossi tau zoo tuaj, thiab cov kev ceev ua, ho expanding cov neeg yuav kev.
• Wireless kev twb kev txuas. Yuav kom siv tau cov ADSL-system, tsis muaj yuav tsum tau mus cuag lub cable rau tus xov tooj thiab muab ib tug ntau ntawm cov khoom. Nce cia siab rau, zoo thiab functionality ntawm lub network.
• Tsis cuam tshuam rau hauv xov tooj txoj kab. ADSL-router ua hauj lwm nyob rau hauv stand-alone hom thiab tsis tsim tej yam teeb meem rau tus xov tooj. Hu thiab surf lub virtual qhov chaw yuav ua tau kiag li dawb.
• Nruam Internet ADSL. Yuav ua li cas yog nws? Qhov no txhais tau tias thaum lub sij hawm network yuav tsis muab failures. Lub tshuab tsis tau ib reconnection. Ib tug neeg siv accesses lub Internet tas li thiab yuav ua tau hauv internet tag nrho cov hnub thiab hmo ntuj.
• Kev ntseeg tau thiab stability. Rau hnub tim, ADSL yog lub feem ntau txhim khu kev qha hom Internet kev twb kev txuas.
• Profitability. Tus nqi ntawm lub ADSL kev twb kev txuas thiab nruab ib lub modem nrog ib tug router yog tsawg heev thiab tsis ntaus lub tsev neeg cov nyiaj txiag.

shortcomings

1. Tsis tiv thaiv tawm tsam crosstalk. Yog hais tias ib tug channel yuav tsum txuas nrog rau ob peb lub kaum os cov neeg muas zaub tau cia siab rau kev kub ceev yog tsis tsim nyog. Ntau subscribers nyob rau hauv ib tug ADSL, lub qis lub zoo ntawm cov ntaub ntawv kis tau tus mob.
2. tsis zoo ADSL-technology txawm hais tias nws muaj, tab sis lawv yog ob peb tug. Nws kuj tseem muaj xws li ib tug tsawg kawg nkaus ceev ntawm lub neeg. Lub asymmetry ntawm ADSL muaj ib qho cuab tsis zoo - los ntawm lub neeg yuav ua ntaub ntawv thov hloov lwm lub tsev yuav ua tau ntev thiab tsis xis nyob. Tab sis lub tshuab yog npaj feem rau ceev nkag tau mus rau hauv Internet rau caij saum nthwv dej. Nyob rau hauv tas li ntawd, cov ntaub ntawv kis los ntawm tus neeg siv, yuav siv sij hawm li qhov chaw me me thiab yuav tsum tau ntau yam kev pab.

Rate thiab yam rau nws

ADSL yog ib tug high-ceev Internet technology, tab sis universal qhov tseem ceeb thiab cov qauv ua ib ke. Rau txhua tus neeg neeg thiab tus neeg tus nqi txiav txim los ntawm ib tug txheej ntawm yam. Nrog rau ib co ntawm lawv tej zaum yuav cuam tshuam rau kev ntseeg tau thiab tsis zoo ntawm cov khoom. Yog li ntawd, mus nqa tawm lub installation ntawm modems thiab routers zoo tshaj plaws cov tub txawg.

Lub ntsiab yog vim li cas rau cov uas tsis muaj kev ceev ADSL-compound yog qhov zoo tshaj ntawm ib tug neeg kab. Peb yuav tau tham txog lub xub ntiag ntawm bridged ub, lawv tus mob, taub thiab ntev ntawm cov hlau. Attenuation yog ib tug ncaj qhov tsim nyog tau ntawm lub nce ntev ntawm lub neeg kab, thiab muaj peev xwm txo tau cuam tshuam vim lub expansion ntawm cov hlau taub. Standard ADSL-channel ntev tsis ntau tshaj 5 km - pom ntau yam rau high-ceev cov ntaub ntawv kis tau tus mob.

ceev cov yam ntxwv

Piv rau lwm Internet sib txuas, ADSL considerably yeej nyob rau hauv ceev technologies. Analog modem muab ib tug tshaj plaws ntawm 56 kbit / s, thaum lub sij hawm ADSL nyob rau hauv thaum ntxov hnub ntawm nws cov tsos twb tso cai rau kis ntaub ntawv ntawm speeds mus txog 144 Kbit / s. ADSL-technology, lub siab tshaj plaws ceev uas yog tseem txiav txim los ntawm cov yam ntxwv ntawm lub modem thiab yuav ncav cuag 2048 Mbit / s, rau optimize cov ntaub ntawv kis tau tus mob. Cov kab heev txhim khu tus neeg siv kev, coj los tshaj cov kev txwv, txawm yog tias koj muaj ntau yam kev cob cog rua computers, txawb tes, ntsiav tshuaj thiab lwm yam gadgets.

technology prospects

Cov Tsam Thawj thiab ADSL technology resources yog cov nyob deb ntawm sab sab. Txawm qauv ADSL2 thiab ADSL2 +, ua tswvcuab rov qab nyob rau hauv nruab nrab 2000 tus, tseem nyob twj ywm siv tau thiab cov txuj. Nws yog, nyob rau hauv qhov tseeb, lub tsuas technology uas yuav muab tau ib tug dav siv Internet tsis cuam tshuam thiab software teeb meem, yog li ib tug competitor rau ntau lwm txoj kev mus txuas rau hauv Internet.

Yam tsawg kawg nkaus kev cov khoom yog complemented los ntawm niaj hnub hom modems. Manufacturers txhua xyoo ua tshiab li uas tsim tau rau lub lag luam nruam tsis muaj qhov yuav tsum tau rau txij nkawm thiab kev pab cuam. Tsis tas li ntawd, ADSL ceev yog lossi ua thiab yog tsis limited megabits. Txuas yuav yam rau ob leeg lub tsev thiab chaw ua hauj lwm rau tag nrho lub tuam txhab nrog dozens ntawm computer cov neeg.

xaus

Yog li ntawd, peb pom hais tias qhov no ADSL-technology, dab tsi yog nws essence thiab ntsiab cai ntawm lub lag luam. Raws li koj tau pom, qhov no yog ib tug ntawm cov technologies uas suab tsis tsis thaum lub sij hawm kev lag luam (txawm yog tias kev cob cog rua rau ob peb kaum tawm ntawm cov neeg siv kom lub network). Nyob rau hauv cov ntaub ntawv no, nws tsis tau qhov reconnection thiab ceev tsis pub tshaj.