DSL and Cable Modems “Broadband Communication Technology”Brief HistoryDSL TypesDSL Advantages / DisadvantagesDSL SecurityDSL CostCable Advantages / DisadvantagesCable SecurityCable CostComparisonQuestions?!?DSL and Cable Modems“Broadband Communication Technology” Murdoch, Tyler Nguyen, HienPiltzer, GabrielBrief HistoryDSL•Joseph Lechleider, developed ADSL (Asymmetry Digital Subscriber Line).•John Cioffi, DMT (discrete multi-tone).Cable•1996-2002 higher capacity hybrid networks of coaxial and fiber optic built.•Cable internet service offered in mid 90’s.Early disappointments over DSL reliability, security of cable internet, and broadband accessibility have largely been addressed.DSL and Cable ModemsHistoryDSL Types Advantages Disadvantages Security CostCable Advantages Disadvantages Security CostConclusion ComparisonDSL Types All types of DSL service fall into one of two basic categories: Symmetric Asymmetric - SDSL -ADSL - SHDSL -RADSL - HDSL -VDSL•Speed dependent on distance and signal frequency DSL and Cable ModemsHistoryDSL Types Advantages Disadvantages Security CostCable Advantages Disadvantages Security CostConclusion ComparisonDSL Advantages / DisadvantagesProsHigh-speed download (up to 5 Mbps)Business – Level DSL service offers guaranteed data rates.Lets you surf the Net and gab on the same line at the same timeConsNot every phone line will work; no easy way to find out if yours does. Speed drops as you get further from phone company central office.Not as widely available as CableDSL and Cable ModemsHistoryDSL Types Advantages Disadvantages Security CostCable Advantages Disadvantages Security CostConclusion ComparisonDSL SecurityDSL has a slight advantage over Cable when it comes to securityDSL in a given neighborhood do not appear as nodes on a LANDSL uses dedicated rather than shared cabling.DSL and Cable ModemsHistoryDSL Types Advantages Disadvantages Security CostCable Advantages Disadvantages Security CostConclusion ComparisonDSL CostLess Expensive•DSL has more variance between service package and price.•DSL is said to be cheaper than Cable by up to 50%.Price Range•DSL likes to keep its price constant, high $20’s, low $30’s.Qwest DSLResidential $27/month - 256Kbps up/down$37/month – 7Mbps Down 896Kbps UpDSL and Cable ModemsHistoryDSL Types Advantages Disadvantages Security CostCable Advantages Disadvantages Security CostConclusion ComparisonCable Advantages / DisadvantagesDSL and Cable ModemsHistoryDSL Types Advantages Disadvantages Security CostCable Advantages Disadvantages Security CostConclusion ComparisonProsSpeeds are not dependent on distance from central offices.Faster maximum speeds (8Mbps+) than DSLSometimes cheaper than DSL, especially when bundled with TV servicesConsMay require professional installation.Line shared with others in neighborhood; speeds may varyMay place limits on data downloads and uploads.Cable SecurityDSL and Cable ModemsHistoryDSL Types Advantages Disadvantages Security CostCable Advantages Disadvantages Security CostConclusion ComparisonUses a shared cable line to provide service to an entire neighborhood DOCSIS (Data Over Cable Service Interface Specification)Cable CostDSL and Cable ModemsHistoryDSL Types Advantages Disadvantages Security CostCable Advantages Disadvantages Security CostConclusion ComparisonMuch more expensive than DSL.Cheaper if purchased bundled with other services:•Television•Voice phoneComcastPromotional Pricing - $20/month for 6 months $43/month after promotion period 6Mbps downComparisonDSL and Cable ModemsHistoryDSL Types Advantages Disadvantages Security CostCable Types Advantages Disadvantages Security CostConclusion ComparisonBoth Cable and DSL use broadband communication technologyDSL uses direct connection while cable uses shared connectionBoth Cable and DSL service providers put speed cap over to residential servicesBoth Cable and DSL high speed internet connection are not available everywhereTypically Cable is faster then DSL and costs more than