Digital Subscriber Line
Broadband Internet Glossary
Broadband Internet — Digital Subscriber Line
Information on Digital Subscriber Line
Digital Subscriber Line allows broadband data services, such
as broadband Internet access, to be carried on conventional copper
pair telephone cables.
A Digital Subscriber Line system may be either "symmetric"
or "asymmetric". A symmetric Digital Subscriber Line system provides the same
capacity for uplink and downlink. An asymmetric Digital Subscriber Line system
provides different uplink and downlink capacities; typically a much higher
capacity is provided for the downlink than for the uplink.
In
principle, a Digital Subscriber Line system using copper telephone cables can
provide a data rate up to 50 Mbps over very
short ranges (perhaps 100m), declining to approximately 10 Mbps at
2 km and 2 Mbps at 4 km. Practical systems
mostly operate at much lower data rates, due to limitations
in the channel coding and modulation schemes.
Other topics in our resources on Broadband Internet related to Digital Subscriber Line include:
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