the need for speed terry foley rhonda hoskins jerry gilroy jill morgan
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The Need For Speed Terry Foley Rhonda Hoskins Jerry Gilroy Jill Morgan. High Speed Internet Technology. Outline. What is DSL? Where did DSL originate? How does DSL work? What types of DSL are available? Myths and Truths about DSL Its closest competitor - PowerPoint PPT PresentationTRANSCRIPT
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Nov. 7/00 High Speed Internet Technologies
The Need For SpeedTerry Foley
Rhonda HoskinsJerry GilroyJill Morgan
High Speed Internet Technology
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Outline
What is DSL?
Where did DSL originate?
How does DSL work?
What types of DSL are available?
Myths and Truths about DSL
Its closest competitor
http://computingcentral.msn.com/topics/bandwidth/howfast.asp
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What is DSL?
DSL – Digital Subscriber Line
Uses ordinary telephone wire
Speed varies depending on type
An “always on” service – No dial-up
One line carries both data and voice
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Where Did DSL Originate
Created by Bellcore in 1989
To deliver video on-demand to compete with cable TV
Never really used for this
People noticed the potential for internet applications
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How Does DSL Work
Implemented over the “last mile”
Uses digital technology
Utilizes line-coding scheme
Divides line into 3 bands
Lower for voice, Higher 2 for data
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How Does DSL Work cont’d
Phone company must install special router – DSL access multiplexerThis transfers data from copper line to larger backboneCO must be approx. 18000 ft from the end user for top performanceEnd user must have special router or modem
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Types Of DSL
HDSL – High-Data-Rate DSL
ADSL – Asymmetric DSL
RADSL – Rate Adaptive DSL
SDSL – Symmetric DSL
VDSL – Very-High-Rate DSL
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Speeds Of Different Types
DSL Type Downstream Upstream Distance # Of LinesSpeed Speed
HDSL 2 Mbps 2 Mbps Up to 5km 2ADSL Up to 8 Mbps Up to 768 Kbps 3.6 km 1
RADSL Up to 8 Mbps Up to 768 Kbps Up to 6km 1SDSL 768 Kbps 768 Kbps 4 km 1VDSL 13, 26 or 52 Mbps 6 or 13 Mbps Up to 1.5km 1
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Myths And Truths
Myth – DSL is easy to install
Truth – Technician needed to install modem and wiring
Myth – Speed of DSL
Truth – Performance is effected by electromagnetic noise and distance
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Its Closest Competitor
Cable – It provides similar speeds, service and technology
Uses local TV line to give continuous connection
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The Need For Speed