Asymmetric Digital Subscriber Line

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Presentation transcript:

Asymmetric Digital Subscriber Line 1 1

Introduction ADSL is a form of DSL, a data communications technology that enables faster data transmission over copper telephone lines. ADSL is capable of providing up to 50 Mbps, and supports voice, video and data. ADSL is the #1 Broadband Choice in the World with over 60% market share. ADSL is now available in every region of the world.

What does ADSL mean Asymmetric - The data can flow faster in one direction than the other. Data transmission has faster downstream to the subscriber than upstream Digital - No type of communication is transferred in an analog method. All data is purely digital, and only at the end, modulated to be carried over the line Subscriber Line - The data is carried over a single twisted pair copper loop to the subscriber premises

Channel Separation & POTS Splitter Transmission Methods How Does ADSL Work? Functional Elements Use of Bandwidth Channel Separation & POTS Splitter Transmission Methods Discrete Multi-tone Modulation (DMT) Quadrate Amplitude Modulation (QAM) Carrierless Amplitude/phase Modulation (CAP)

Requirements Full use of the copper line frequency spectrum (1.1Mhz). An advanced coding/decoding method. Ability to work simultaneously with POTS on the same copper line.

What different types are there? HDSL SDSL IDSL VDSL ADSL Rate Adaptive DSL, RADSL

ADSL Loop Architecture

ADSL Speed Comparison Pure Fibre Hybrid Fibre/Copper FTTH Enhanced FTTx, VDSL2, ADSL2plus ADSL ISDN Voice band Modem

ADSL Speed Factors The distance from the local exchange. The type and thickness of wires used. The number and type of joins in the wire. The proximity of the wire to other wires carrying ADSL, ISDN and other non-voice signals. The proximity of the wires to radio transmitters.

ADSL Modem Structure Mbit/s ADSL Modem ADSL Modem kbit/s POTS Filter Line POTS Filter kbit/s POTS Linecard Exchange End Customer End

Uninterrupted, high-speed Internet access that's always on-line. Benefits of ADSL Simultaneous Internet and voice/fax capabilities over a single telephone line. Uninterrupted, high-speed Internet access that's always on-line. Cost-effective solution for residential customers, telecommuters and small businesses.

Distance-sensitive Slower upload speeds Phone line required Disadvantages Of ADSL Distance-sensitive Slower upload speeds Phone line required

Conclusion ADSL was born of the need for speed coupled with the desire for low cost dedicated remote network access. There is no doubt that ADSL has revolutionize the way we see the World Wide Web, and quite possibly witness the demise of home entertainment as we know it. As the phoenix from the flames we see ADSL has emerged heralding the coming of a new age of remote multimedia.

PPT Source: www.studymafia.org THANKS PPT Source: www.studymafia.org