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幼苗
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Unceasingly promotes along with the ADSL technology in the globalscope large-scale promotion as well as in view of to the DSLtechnology application and the service,turned on based on thetelephone twisted pair line XDSL wide band already occupies the wideband to turn on the market the half of the country.But,and caters tothe demand well under the service need to develop which the networkoperation and the information expends,ADSL2 and the ADSL2 +technology arises at the historic moment.ADSL2 + the G 992.5 standard further expands in the ADSL2G 992.3foundation,therefore from the whole looked was allowed to regard asADSL2+ is the ADSL promotion edition it has had all functions whichADSL had,and has carried on the certain development in the ADSLoriginal foundation,for example:Expanded 2.2MHz the ADSL original1.1MHz frequency spectrum,the corresponding target channel alsoexpanded a time to arrive 511 stature channels,moreover the sub-channel was responsible the content has been dissimilar,but eachstature channel occupied the frequency spectrum and for the increasestill was approximately is 4.3KHz.Moreover quickly leads from also tohave the very big enhancement the ADSL2+ maximum under stroke speedrate is the 24Mbit/s minimum under stroke speed rate is 16Mbit/s,theprevious line is 800Kbit/S.Compares with ADSL,ADSL2 + has all obtained the breakthrough in thetechnology and the application.First,the traditional ADSL system can provide the maximum understroke speed rate is 8M; But ADSL2 + through the frequency spectrumexpansion,realizes from 26KHz to 2.2MHz frequency distribution,realizes 512 stature carrier frequencies,the maximum under strokespeed rate at least may achieve 20Mbps,may with ease provide likewide band service and so on video frequency telephone,VOD,videofrequency conference in a more loose distance.Second,the traditional ADSL system biggest cover scope approximatelyis 3km,if the line has the damage,the noise disturbance,then coversthe scope is smaller,seriously limited the user to turn on theability.But ADSL2 + uses the enhancement the modulation way and theseamless speed suitably matches,may reduce the line noise well to thesignal the influence,may cover the distance to extend to 6km about,can turn on the user quantity greatly enhances,in particularcountryside and city and countryside union department.Front third,the traditional ADSL system clears or service movementperiod in the service is unable to the line parameter to carry on themonitor,to line whether can clear the ADSL service or breaks downwhen a diagnosis helplessness; But ADSL2 + has the formidable linediagnosis ability,the overall system line quality evaluation and thebreakdown localization function had the past a has been very biggerthan improvement,caused the ADSL service to change easier to manageand the maintenance.Quite in period of time,ADSL all will be the mainstream way which thewide band turns on,but ADSL2 + relies on in its technical being inthe lead,will certainly to continue ADSL already to have the statusto become the market application mainstream
1年前
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