Asymmetric Digital Subscriber Line
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23-12-2010, 02:05 PM

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Manoj Kumar
Piyush Mishra

.ppt   adsl fiinal29.ppt (Size: 690 KB / Downloads: 74)

What Is ADSL
ADSL – Asymmetrical Digital Subscriber Line, is a broadband communication technology that creates high-speed access to the Internet and remote networks using the phone lines that are already present in your home. ADSL is superior to analog modems in many respects.
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
Total Subscribers
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
Simultaneous Connections
Talk on the phone and surf the Internet at the same time on the same phone line!
You do not have to disable call waiting to connect to the Internet.

ADSL standards :
ADSL Speed Comparison

What is fiber optics?

We're used to the idea of information travelling in different ways. When we speak into a landline telephone, a wire cable carries the sounds from our voice into a socket in the wall, where another cable takes it to the local telephone exchange. Cellphones work a different way: they send and receive information using invisible radio waves—a technology called wireless because it uses no cables. Fiber optics works a third way. It sends information coded in a beam of light down a glass or plastic pipe. It was originally developed for endoscopes in the 1950s to help doctors see inside the human body without having to cut it open first. In the 1960s, engineers found a way of using the same technology to transmit telephone calls at the speed of light (186,000 miles or 300,000 km per second).

Integrated Services Digital Network: the CCITT standard that defines a completely digital telephone/telecommunications network which carries voice, data, and video over existing telephone network infrastructure. ISDN provides two 64 Kbit/s channels, which can be combined or used independently for both voice and data. It is designed to provide a single interface for hooking up a phone, fax machine, PC, etc.


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