DSL
DSL describes a family of technologies
that try to offer a high-capacity data rate over a standard copper
telephone line.
When I was talking about modem
standards, I mentioned that that the passband of the local loop is only about 3000Hz.
This is generally caused by limitations of the equipment at the
exchange, rather than any limitation of the copper wire itself. If
this equipment is replaced, then data can be sent across a wider range
of frequencies than those available to the standard telephone system
(300Hz – 3400Hz). Although the signal will be more distorted
when using frequencies higher than 3400Hz to transmit data,
sophisticated equipment at the subscriber's end which acts an equaliser can compensate for this.
This equipment is known as a DSL modem.
Click here for more details on specific types of DSL, namely ADSL, SDSL and VDSL.
Links
WhatIs
guide to DSL
DSL Report
Everything
DSL


Introduction - Modems - ISDN - DSL - cable modems - Mobile comms - Conclusion - Glossary
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