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ADSL's Business Highlights

Residential and small business customers who use DSL services are most typically connected to an asymmetric DSL (ADSL) line. ADSL splits the available frequencies in a line, assuming that most Internet users view or download a lot more data than they transmit or upload. Considering this, if the connection speed from the Internet to the user is three to four times as fast as the connection from the user back to the Internet, then, the majority of the time, the user will reap the most benefit from an ADSL connection.

History of ADSL

ADSL was established by telephone companies in an effort to compete with cable TV by delivering both TV and phone service on the traditional copper phone line. These days, ADSL is also a top competitor as a provider for high speed Internet access. In the beginning, ADSL was originally created for use as a regular phone line in the event of a power outage. The "A" in "ADSL" stands for "Asymmetric", meaning data can be sent to the consumer, but the consumer cannot send back very much data at all. At first, only 64kbps was supported but now ADSL can manage up to 10 times that much. In 1987, Joe Leichleder, a Bellcore researcher, first conceived the idea to convert analog to digital at the subscriber end. ADSL was originally intended to provide access for interactive video, such as video games, Video On Demand (VOD), delayed television segments, and more, but quickly became popular for high-speed Internet data transmission, as well as just surfing the Web. As far back as the 1990s marketers who developed VOD products began utilizing ADSL technology with varying speeds for transmitting different channels. And, although the idea didn't catch on as well as had been predicted for the television market, it quickly became very popular for use with the Internet.

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Confused about all the new terminology?

digital signal - A signal that takes on only two values, off or on, typically represented by "0" or "1." Digital signals require less power but (typically) more bandwidth than analog, and copies of digital signals can be made exactly like the original.

glossary of terms