06226331 is referenced by 28 patents and cites 24 patents.

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.

Title
Data access arrangement for a digital subscriber line
Application Number
9/404006
Publication Number
6226331 (B1)
Application Date
September 23, 1999
Publication Date
May 1, 2001
Inventor
Michael J Gambuzza
Boston
MA, US
Agent
McDermott Will & Emery
US
Assignee
C P Clare Corporation
MA, US
IPC
H04L 25/00
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