Various types of dsl broadband internet connections
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Stands for "Digital Subscriber Line." DSL is a communications medium used to transfer digital signals over standard telephone lines. Along with cable Internet, DSL is one of the most popular ways ISPs provide broadband Internet access. When you make a telephone call using a landline, the voice signal is transmitted using low frequencies from 0 Hz to 4 kHz. This range, called the "voiceband," only uses a small part of the frequency range supported by copper phone lines. Therefore, DSL makes use of the higher frequencies to transmit digital signals, in the range of 25 kHz to 1.5 MHz. While these frequencies are higher than the highest audible frequency (20 kHz), then can still cause interference during phone conversations. Therefore, DSL filters or splitters are used to make
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Various types of dsl broadband internet connections
- 1. ProfessorAJAL’SCLASSES Various Types of DSL Broadband Internet Connections Table of Content 1. Overviewof DSL 2. Typesof DSL Technologies 3. Disadvantagesof DSL 4. ShouldIGet DSL? 5. Summary ________________________________________ Overview of DSL There are a variety of flavors when it comes to Digital Subscriber Line (DSL) broadband Internet connection. DSL is a technology that brings high bandwidth Internet connection to homes and businesses over ordinary copper telephone lines. DSL technology allows data transmission at speeds much fasterthanthe bestavailable analogand digital modems. In general, most DSL connections offer downloadspeedsbetween5to35Mbps and uploadspeedsbetween1to 10Mbps. We'll explainafewof the variety of DSL connections below. ________________________________________ Typesof DSL Technologies DSL is a generictermusedfora familyof relatedtechnologies,includingRADSL,ADSL,SDSL,IDSL,and others.The leadingDSLtechnologiesbeingdeployedtodayinclude: RADSL - (Rate Adaptive DigitalSubscriberLine) • Most robust businessDSLavailabletoday; • Developedtoovercome line impediments; • Automaticallyadjustsforenvironmental conditions; - Because RADSLisa type of SDSL,it supportssymmetric(equal downstreamandupstream) datatransmissionsupto768K. ADSL - AsymmetricalDigital SubscriberLine ADSL supportsa range of asymmetric(higherdownstreamthanupstream) dataspeedsthatcanreach up to 7Mbps downstreamand1.5Mbps upstream.ADSLcan deliversimultaneoushigh-speeddataand telephoneserviceoverthe same line.
- 2. ProfessorAJAL’SCLASSES ADSL Lite (orG.lite) Thisis a lowerspeedversionof ADSLandprovidesdownstreamspeedsof upto1Mbps and upstream speedsof 512 kbps,at a distance of 18,000 feetfromthe service provider’spremises.Itisintendedto simplifyDSLinstallationatthe user’send. ________________________________________ ________________________________________ R-ADSL- Rate-AdapativeDigital SubscriberLine The R-ADSL providesthe same transmissionratesasADSL,butan DSL is a generictermusedfora familyof relatedtechnologies,includingRADSL,ADSL,SDSL,IDSL,and others.The leadingDSLtechnologiesbeingdeployedtodayinclude: RADSL - (Rate Adaptive DigitalSubscriberLine) • Most robust businessDSLavailabletoday; • Developedtoovercome line impediments; • Automaticallyadjustsforenvironmental conditions; - Because RADSLisa type of SDSL,it supportssymmetric(equal downstreamandupstream) datatransmissionsupto768K. ADSL - AsymmetricalDigital SubscriberLine ADSL supportsa range of asymmetric(higherdownstreamthanupstream) dataspeedsthatcanreach up to 7Mbps downstreamand1.5Mbps upstream.ADSLcan deliversimultaneoushigh-speeddataand telephoneserviceoverthe same line. ADSL Lite (orG.lite) Thisis a lowerspeedversionof ADSLandprovidesdownstreamspeedsof upto1Mbps and upstream speedsof 512 kbps,at a distance of 18,000 feetfromthe service provider’spremises.Itisintendedto simplifyDSLinstallationatthe user’send. ________________________________________ ________________________________________ R-ADSL- Rate-AdapativeDigital SubscriberLine The R-ADSL providesthe same transmissionratesasADSL,butan R-ADSL modemcandynamicallyadjust the speedof the connectiondependingonthe lengthandqualityof the line. HDSL - Hight Bit-Rate Digital SubscriberLine
- 3. ProfessorAJAL’SCLASSES The HDSL providesasymmetricconnection,thatis,upstreamspeedsanddownstreamspeedsare the same,and range from1.544Mbps to 2.048Mbps at a distance of 12,000–15,000 feet.Symmetric connectionsare more useful inapplicationslike videoconferencing,where datasentupstreamisas heavyas data sentdownstream.HDSL-II,whichwill provide the same transmissionratesbutovera single copper-pairwire,isalsoroundthe block. IDSL - ISDN Digital SubscriberLine The ISDN Digital SubscriberLine providesupto144 kbpstransmissionspeedsata distance of 18,000 feet(canbe extendedwitharepeater),andusesthe same techniquestotransferdataas ISDN lines.The advantage isthat, unlike ISDN,thisisan‘alwayson’connection. SDSL - SymmetricDigital SubscriberLine SDSL supportssymmetric(equal downstreamandupstream) datatransmissionsupto1.54Mbps. VDSL - VeryHigh Bit-rate Digital SubscriberLine VDSL isthe fastestof all xDSL flavorsandprovidestransmissionratesof 13–52Mbps downstreamand 1.5–2.3Mbps upstreamovera single copper-pairwire,ata distance of 1,000–4,500 feetfromthe service provider’spremises. VDSL2 - VeryHighBit-rate Digital SubscriberLine 2 VDSL2 isfasterthan VDSL andprovidestransmissionratesupto100Mbps at longerdistances. ________________________________________ ________________________________________ Disadvantagesof DSL One of the majordisadvantagesof DSLis thatit is distance-sensitive.The furtheryourhome isfromyour telephonecompany'scentral office (CO),the loweryourbandwidthbecomes.Ingeneral,the maximum distance forDSL is about18,000 feet(3.4 miles). Additionally,the qualityof yourhome'swiringcanaffectyourbandwidth.WithDSL,youshoulduse a filtertoreduce unwantednoice onthe telephoneline,suchasthe one illustrated. Lastly,DSL has a lowuploadspeed.Formostthat onlyaccessthe Internettowatch movies,listento music,checkemail,doshopping,andsimilaractivities,DSLisgenerallysufficent.However,if youdoweb conferencing,playonlinemulti-playergames,orstreamonYouTube or Twitch,DSL wouldbe too laggy for an enjoyableexperience.Forthese type of activities,cable orfiberInternetconnectionare the betteroptions.
- 4. ProfessorAJAL’SCLASSES ________________________________________ ShouldyouGetDSLInternet? AlthoughDSLis a stepup fromdial-upInternet,DSLisone of the slowerconnectionavailable inthe UnitedStates.If youlive inan urbanarea, youwill likelyhave accesstothe much fastercable or fiber technologiesforInternetaccess.Withcable Internet,speedcanrange between10to 500Mbps and fiber between50to 1,000Mbps. These speedsare significantlymuchhigherthanDSL's 1 to 10Mbps. Additionally,the costof a lowtiercable or fibersubscriptionplanmaycostas much as a DSL plan.And insome case,may evenbe less. Withthe type of contentand servicesmostpeopleaccessthroughthe Internet(suchasmovies,music, streaming,onlineclassroom, andwebconferencing),DSLdoesnothave the bandwidthtosupportthem effectively,particularlyif more thanone of these type of contentorservicesare beingaccessor usedin your householdatthe same time.The recommendationistogetDSL Internetif cable andfiberare not available inyourarea.