Explain Digital Subscriber Line Working with Diagram and Explanation
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DSL (Digital Subscriber Line)
Over the past 30 years, much of the traditional analogue telephone network has been replaced by digital technology.
A device called a codec(coder/decoder) is used to convert analogue voice signals into digital information that can be handled by the digital technology.
The codec is also used to convert the digital signals back into analogue voice signals that can be handled by the older analogue technology.
Now most of the telephone network is digital. Only the local loop is still analogue and this too can be replaced by ISDN connections.
Digital Subscriber Line (DSL) is a family of technologies that provides digital data transmission over the wires of a local telephone network.
Digital data is transmitted to the computer directly as digital data and this allows the telephone company to use a much wider bandwidth for transmitting the data to its destination.
With DSL technology, the copper twisted-pair lines remain the same, but new equipment is integrated, enabling a service provider to deliver voice and high-speed data service.
With DSL both data and voice can be sent at the same line and at the same time using multiplexing.
Working:
Subscriber is connected through the analog or DSL line.
At the central office side some kind of splitter is used.
In the splitter, one side goes data using DSLAM that goes may be to the Internet.
Other part goes to the voice switch to the PSTN.