Abstract

DSL modems are devices that allow high-speed access to information at a distant server, which may be an Internet server, via the normal telephone network. Digital subscriber line (DSL) is a generic name for a family of standards that allow existing twisted pair copper lines (the phone wires) to carry modulated digital content at high speed by expanding the amount of frequency. Despite its name, DSL does not refer to a physical line, but rather to a pair of modems that use encoding and multiplexing to create a line that is capable of transmitting both voice and data on the same line. A DSL system comprises of DSL modem on the customer's end, commonly referred to as CPE (customer premise equipment), which is connected to another DSL Modem, DSLAM (DSL Access Multiplexer) at the Local Call office. The paper further elaborates the following aspects of the DSL modem: Working, standards, itu-t, dsl infrastructure, infrastructure requirement for cpe, infrastructure requirement for coe, variants of dsl modems, the simple dsl transceiver, the role of dslam, applications, dsl in education, voice over dsl.

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