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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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