Digital Subscriber Line
DSL, unlike analog services, does not provide a digital to analog conversion, but rather acts as an interface to a digital signal that is carried on the same subscriber line that provides the analog line for the telephone. While digital communications to the customer premises is common for business customers, the “last mile” to private customers has traditionally been analog; however, this is now changing with DSL. Although Asymmetric DSL (ADSL) is the most widely deployed DSL, a brief overview of some of the more common service offerings of DSL is presented as well.
High Data-Rate Digital Subscriber Line (HDSL)
HDSL is a T1 (or E1 in Europe) replacement that allows the use of copper without the necessary repeaters of ...