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What is ADSL? How fast is DSL?

What is ADSL? How fast is DSL?
ADSL stands for 'Asymmetric Digital Subscriber Line'. It provides high speed, always-on access to the Internet from your home or business telephone line,.

By sending digital signals over the telephone line, it provides broadband Internet access without interrupting your normal (and concurrent) use of the telephone line for placing and receiving phone calls.

It provides an effective way to provide Internet access in a variety of situations, without the complications of configuring and operating a modem. It has a number of technical advantages compared to accessing the Internet via a dialup modem or other means. The 'Asymmetric' part of these services is related to their data transfer speed, which is slower on the 'upload' (to the Internet) direction than it is on the download (from the Internet) direction.

This is similar to a 56k modem, which is only 'fast' in the download direction, and slower uploading. Most other commonly available data services (such as Telstra leased lines, ISDN and Agile broadband services) are Symmetric - meaning that the upload and download speeds are the same.

(Internode has a symmetric option for DSL as well, which offers a 512 kilobit per second transfer rate in both the upload and download directions - it is actually an ADSL service where the upload and download speeds are the same..!)

How fast is DSL?

You have a choice of access speeds with ADSL:

Compare these speeds to a conventional modem, which typically can download at around 45 kilobits per second and upload at around 31 kilobits per second, and you can see the dramatic speed difference available with ADSL - up to 30 times faster than a modem, with no dropouts, and no blocking of your normal telephone service. This speed difference is truly revolutionary - it changes your perception and experience of the Internet in dramatic ways.

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