Data access arrangement for a digital subscriber line
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United States of America Patent
Stats
-
May 1, 2001
Grant Date -
N/A
app pub date -
Sep 23, 1999
filing date -
Nov 12, 1998
priority date (Note) -
In Force
status (Latency Note)
Importance
Abstract
An improved line interface device and an improved xDSL modem for use in connecting data communications equipment to a xDSL line is disclosed. The line interface device provides the required isolation between the xDSL line and the communications equipment using optical isolation or capacitive techniques, as well as provides the power necessary to produce the transmit signal levels required by the communications services by utilizing a switching power supply deriving its power from a source isolated from the line, and including a transformer for isolating the source from the xDSL line. By switching at high frequencies the size of the transformer can be sufficiently small so that the interface device and supply can be provided in accordance with small form factor requirements.
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