Protocol for .ADSL
Asymmetric Digital Subscriber Line, or ADSL, service is the method used to deliver broadband to customers; it shares the telephone lines with voice traffic. It is able to use a frequency not occupied by voice traffic, and so both streams can pass over the line simultaneously.
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Features
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Because Internet users download a lot more data than they upload, a wider frequency band for downloads allows for faster traffic where greater demand exists, hence the Asymmetric aspect of the service.
Definition
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The protocol for ADSL was first defined by the Telecommunications Committee of the American National Standards Institute in 1998. This standard is called ANSI T1.413-1998. The International Telecommunication Union, or ITU, followed this recommendation with its own standards for ADSL, which are called G.992.1 and G.992.2. These standards were published in 1999 and are conventionally known as G.dmt and G.lite. DMT stands for Discrete Multi-tone Transmission.
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Development
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The ITU developed ADSL protocols, but subsequent advancements, ADSL2, ADSL2+ and HDSL, were given different names.
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References
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