ADSL Technology
description
Transcript of ADSL Technology
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ADSL Technology
ProjectOn
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Broadband Broadband= ‘Broad’ + ‘Band’ Transportation of multiple
signals & traffic simultaneously. Medium- OFC, twisted Cu pair,
wireless. Before broadband, Dial-up was
in use. Cable modem introduced in
1997. Became familiar in 2001..
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Digital Subscriber Lines
(DSL)
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What is DSL.?
High Internet Access over existing telephone lines.
Utilizes bridge or router at customer location connects to DSLAM.
The DSLAM connects and we are connected to internet.
DSL technology introduced in 1989.
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Features of DSL
Fast Access.
Constant Connectivity.
Big-business bandwidth at small-business price.
Uninterrupted phone services.
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Introduction to ADSL
Enables high speed data transfer in same Cu telephone lines.
Utilizes the frequencies that is not used by telephones calls.
A splitter allows single telephone lines to be used for both.
At exchange line terminates at DSLAM.
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Operation
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ADSL capacities
The "upstream" and "downstream" pipelines have different capacities.
ADSL broadband can transfer data at rates of 1.5 to 9 Mbps when receiving data.
The ability of ADSL to send data, is limited to between 16 to 640 Kbps.
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ADSL Upstream ADSL Downstream
Minimum 16,000 bits/sec
1,500,000 bits/sec
Maximum 640,000 bits/sec
9,000,000 bits/sec
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ADSL Strength Inexpensive
Widely available
High speed downloads and surf.
Always connected, do not monopolize phone lines.
Multiple user access without degradation
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ADSL weakness
Not available everywhere, say above 5.5 km from exchange.
Speed is affected as distance increases.
Web conferencing, web hosting, VoIP services are not well suited to ADSL.
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Alternatives
IDSL
SDSL
VDSL
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IDSL
ISDN Digital Subscriber Lines
Speed 144kbps.
Not available in all countries
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SDSL
Symmetric Digital Subscriber Line
Up and Downstream Bandwidth are same.
Narrow cable supports only data, not analog calls.
Speed- 1.54 - 2.04 Mbps Max distance- 3 km. (10,000 fts) Needs separate copper pair.
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VDSL
Very-high-bit-rate DSL. Faster than ADSL . Speed
Cu pair Down- 52Mbps, Up-16Mbps
Coaxial cable 85 Mbps Up & Down
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ThankYou
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Made by-
Pratik Sadegaonkar Rahul Yadav Rahul Marar Rajesh Gavel Jaimala Jain