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Home > Asymmetric Digital Subscriber Line

1 Introduction

As compared to other forms of DSL, ADSL has the distinguishing characteristic that the data can flow faster in one direction than the other, i.e., asymmetrically. Providers usually market ADSL as a service for people to connect to the Internet in a relatively passive mode: able to use the higher speed direction for the "download" from the Internet but not needing to run servers that would require bandwidth in the other direction.

ADSL can use any of a variety of modulation techniques, but the ANSI and ETSI standards use DMT modulation schemes. It is worth noting that in contrast to the modulation schemes that baseband technologies like Gigabit Ethernet use, ADSL uses primarily analogue modulation schemes, so the 'D' in ADSL is a misnomer -- ADSL is simply a very fast analogue dial-up connection (using PPPoE) with much higher symbol rates and much faster handshaking between modems.

For conventional ADSL, downstream rates start at 256 kbit/s and typically reach 9 Mbit/s (if one is less than 1000 feet from the central office) but can go as high as 52 Mbit/s over short ranges of within 100 metres (so-called VDSL). Upstream rates start at 64 kbit/s and typically reach 256 kbit/s but can go as high as 768 kbit/s. The name ADSL Lite is sometimes used for the slower versions.

A newer variant called ADSL2 provides higher downstream rates (up to 12 Mbit/s for spans of less than 8000 feet/2.5 kilometers). Higher symbol rates and more advanced noise-shaping are responsible for these increased speeds. ADSL2+ boosts these rates to up to 25 Mbit/s for spans of less than 5000 feet/1.5 kilometers.

Because of the relatively low data-rate (compared to optical backbone networks) ATM is an appropriate technology for multiplexing time-critical data such as digital voice with less time-critical data such as Web traffic; ATM runs widely over ADSL technology to ensure that this remains a possibility.

ADSL service providers may offer either static or dynamic IP addressing. Static addressing is preferable for people who may wish to connect to their office via a virtual private network, for some Internet gaming, and for those wishing to use ADSL to connect a Web server.

2 ADSL radio

ADSL radio is a hardware that can play directly web radioWeb radio (or Internet radio is a radio re-broadcasting service one can receive via the Internet. Because the radio signal is relayed over the Internet through the World Wide Web, it is possible to access the stations from anywhere in the world—for exampl, without using a computertower of a personal computer. A computer is a device for making calculations or controlling operations that are expressible in numerical or logical terms. While factually accurate, this definition and those found in other dictionaries are so broad that th.

3 ADSL standards

Additionally, the non-Annex ADSL2 and ADSL2+ support an extra 256 kbps of upstream if the bandwidth normally used for POTSPlain old telephone service or POTS are the services available from analogue telephones prior to the introduction of electronic telephone exchanges into the public switched telephone network. These services had been available almost since the introduction voice calls is allocated for ADSL usage.

The downstream and upstream rates displayed are theoretical maximums. Note also that because DSLAM and ADSL modems may have been implemented based on differing or incomplete standards some manufacturers may advertise different speeds. For example, EricssonEricsson Telefonaktiebolaget L. Ericsson is a Swedish telecommunications equipment manufacturer, founded in 1876 as a telegraph equipment repair shop by Lars Magnus Ericsson. In the early 20th century, Ericsson dominated the world market for manual teleph has several devices that support non-standard upstream speeds of up to 2 Mbps in ADSL2 and ADSL2+.

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