ADSL Technology

ProjectOn

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..

Digital Subscriber Lines

(DSL)

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.

Features of DSL

Fast Access.

Constant Connectivity.

Big-business bandwidth at small-business price.

Uninterrupted phone services.

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.

Operation

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.

  ADSL Upstream ADSL Downstream

Minimum 16,000 bits/sec

1,500,000 bits/sec

Maximum 640,000 bits/sec

9,000,000 bits/sec

ADSL Strength Inexpensive

Widely available

High speed downloads and surf.

Always connected, do not monopolize phone lines.

Multiple user access without degradation

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.

Alternatives

IDSL

SDSL

VDSL

IDSL

ISDN Digital Subscriber Lines

Speed 144kbps.

Not available in all countries

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.

VDSL

Very-high-bit-rate DSL. Faster than ADSL . Speed

Cu pair Down- 52Mbps, Up-16Mbps

Coaxial cable 85 Mbps Up & Down

ThankYou

Made by-

Pratik Sadegaonkar Rahul Yadav Rahul Marar Rajesh Gavel Jaimala Jain