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Class Information
Number: 379/93.36
Name: Telephonic communications > Telephone line or system combined with diverse electrical system or signalling (e.g., composite) > Having transmission of a digital message signal over a telephone line > By voice frequency signal (e.g., tone code) > Modulated audio tone > Line powered
Description: Subject matter including particular circuitry for deriving power from the telephone line to data communication equipment (DCE).

Patents under this class:

Patent Number Title Of Patent Date Issued
8600041 Method and apparatus for improving power output efficiency of line driver Dec. 3, 2013
8494129 Communication apparatus, integrated circuit, and communication method Jul. 23, 2013
8363800 Communication apparatus, integrated circuit, and communication method Jan. 29, 2013
7924990 Communication apparatus, integrated circuit, and communication method Apr. 12, 2011
7876775 Connection management for data networks Jan. 25, 2011
7720201 Communication apparatus May. 18, 2010
7512220 DSL modem and a method of providing operating power for same Mar. 31, 2009
7406614 Electronically implemented dynamic start up method for ports with inrush current limiting functionality Jul. 29, 2008
7368798 Integrated DC/DC converter substrate connections May. 6, 2008
7293182 Methods and apparatus for powering a data communications port Nov. 6, 2007
6952785 Methods and apparatus for powering a data communications port Oct. 4, 2005
6845156 System for reducing distortion in a line powered modulator Jan. 18, 2005
6795538 Initialization and monitoring system and method for DLC device Sep. 21, 2004
6778665 Distribution of current draw in a line powered DAA Aug. 17, 2004
6735305 Detection of low tip/ring currents in a line powered DAA May. 11, 2004
6731728 Low noise line powered DAA with differential feedback May. 4, 2004
6728372 Wire bound telecommunications device and a power supply circuit Apr. 27, 2004
6687371 Maintaining an off-hook condition during a call bridge Feb. 3, 2004
6674857 Startup procedure for international line powered DAA Jan. 6, 2004
6658098 Power transfer apparatus for use by network devices including telephone equipment Dec. 2, 2003
6449348 Power transfer apparatus for use by network devices including telephone equipment Sep. 10, 2002
6421430 Line powered DAA with single ended feedback Jul. 16, 2002
6377667 Telephone line-assist powered apparatus with programmable hold current Apr. 23, 2002
6212274 Line powered modem Apr. 3, 2001
6205219 Call related information reception using sigma/delta modulation Mar. 20, 2001
6041105 Adapter circuitry for computers to support computer telephony Mar. 21, 2000
5958055 Power management system for a computer Sep. 28, 1999
5875235 Transformerless data access arrangement Feb. 23, 1999
5809068 PCMCIA modem Sep. 15, 1998
5631952 Apparatus and method for modem wake-up with autobaud function May. 20, 1997
5555293 Optically-coupled data access arrangement and transhybrid Sep. 10, 1996
5530879 Computer system having power management processor for switching power supply from one state to another responsive to a closure of a switch, a detected ring or an expiration of a timer Jun. 25, 1996
5446782 Terminal connecting device having an auto data receiving function Aug. 29, 1995
5375051 Apparatus using serial data line to turn on a transceiver or other device Dec. 20, 1994
5369687 Apparatus for electrically isolating a telephone line from a data device Nov. 29, 1994
5224154 Line powered DCA including dual programmed microcontrollers Jun. 29, 1993
5181240 Data circuit-terminating equipment with power source device Jan. 19, 1993
5086454 Direct connect modem deriving power from telephone line Feb. 4, 1992
5032819 Data communications system Jul. 16, 1991
4847863 Expandable modular data modem Jul. 11, 1989
4803719 Method for powering telephone apparatus and telephone apparatus powered directly from the telephone line without external power Feb. 7, 1989
4677646 Dataset powered by control and data signals from data terminal Jun. 30, 1987
4607139 Interface module for telephone lines Aug. 19, 1986
4598172 Telecommunication terminal Jul. 1, 1986
4592069 Line powered modem May. 27, 1986
4578533 Switchable line powered modem Mar. 25, 1986
4534039 Dataset powered by control and data signals from data terminal Aug. 6, 1985
4417099 Electro-optical isolator circuit for line powered modem Nov. 22, 1983
4395590 Line powered modem Jul. 26, 1983
4373117 DC to DC converter for line powered modem Feb. 8, 1983

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