DSL
DSL invokes a method for moving data over regular phone
lines. A DSL circuit is much faster than a regular phone
connection, and the wires coming into the subscriber's premises
are the same (copper) wires used for regular phone service. A
DSL circuit must be configured to connect two specific
locations, similar to a leased line (howeverr a DSL circuit is
not a leased line. A common configuration of DSL allows
downloads at speeds of up to 1.544 megabits (not megabytes) per
second, and uploads at speeds of 128 kilobits per second. This
arrangement is called ADSL: Asymmetric Digital Subscriber Line.
Another common configuration is symmetrical: 384 Kilobits per
second in both directions. In theory ADSL allows download speeds
of up to 9 megabits per second and upload speeds of up to 640
kilobits per second. DSL is now a popular alternative to Leased
Lines and ISDN, being faster than ISDN and less costly than
traditional Leased Lines. See also: ADSL, Bandwidth, ISDN,
Leased Line, SDSL.
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