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Browse by Category: Main > Communications
Class Information
Number: 379/377
Name: Telephonic communications > Supervisory or control line signaling > Using line or loop condition detection (e.g., line circuit)
Description: Subject matter in which the supervisory or control signal is generated in response to an electrical state of a subscriber circuit.










Sub-classes under this class:

Class Number Class Name Patents
379/381 Busy test or make busy 60
379/380 By bridge circuit 49
379/382 For ring trip or polarity reversal detection 194
379/383 Of plural lines 30
379/385 Relayless 46
379/378 With current controlling electromagnetic core device (e.g., hall-effect device) 66
379/379 With optical link between line and switching system 113


Patents under this class:
1 2 3 4 5 6 7 8

Patent Number Title Of Patent Date Issued
8630726 System and method for detecting three-way call circumvention attempts Jan. 14, 2014
8538002 Telephone system Sep. 17, 2013
8526585 Communication terminal device Sep. 3, 2013
8437467 Method and apparatus for non-disruptive telecommunication loop condition determination May. 7, 2013
8433056 Validated signal resumption in DSL systems Apr. 30, 2013
8433046 Line control apparatus, line control method, and computer-readable storage medium Apr. 30, 2013
8432981 High frequency and idle communication signal state detection Apr. 30, 2013
8368337 HVAC equipment phase and voltage monitor and control Feb. 5, 2013
8345850 System and method for detecting three-way call attempts Jan. 1, 2013
8335309 Method and communication terminal for detecting the status of a telephone receiver Dec. 18, 2012
RE43706 Fallback function telecommunications device Oct. 2, 2012
8254527 Method and arrangement for loop qualification in a digital subscriber line (DSL) system Aug. 28, 2012
8249247 Tracking voltage regulator for a subscriber line interface circuit Aug. 21, 2012
8223958 Determining an active line Jul. 17, 2012
8081778 VOX circuit with 2-wire interfaces Dec. 20, 2011
7995743 Method and apparatus for non-disruptive telecommunication loop condition determination Aug. 9, 2011
RE42590 Telephone line coupler Aug. 2, 2011
7920695 Telephony distribution system Apr. 5, 2011
7844048 Selective tone event detector and method therefor Nov. 30, 2010
7769152 Communications apparatus and communications system including the communications apparatus Aug. 3, 2010
7684386 Apparatus and method for communications control Mar. 23, 2010
RE41164 Impedance blocking filter circuit Mar. 16, 2010
7664253 Main terminal and a method of operating the same Feb. 16, 2010
7639791 Means and method for detecting three-way call attempts Dec. 29, 2009
7603486 Network management system providing logic signals over communication lines for detecting peripheral devices Oct. 13, 2009
7587040 Systems and methods for detecting false signals on an outbound call Sep. 8, 2009
7567664 Method and apparatus for providing accessibility features for a telephone Jul. 28, 2009
7450938 Method for improving communication success rate in simultaneous call trial between subscribers in mobile communication systems Nov. 11, 2008
7330502 Input/output circuit and semiconductor integrated circuit Feb. 12, 2008
RE40020 Impedance blocking filter circuit Jan. 22, 2008
7315592 Common mode noise cancellation Jan. 1, 2008
7260152 Method and device for injecting a noise signal into a paired wire communication link Aug. 21, 2007
7254230 Subscriber line interface circuitry Aug. 7, 2007
7227943 Tone detector Jun. 5, 2007
7224793 Communication set with detection of set function and line condition May. 29, 2007
7190769 Apparatus for controlling operation of a recording device with a telephone instrument Mar. 13, 2007
7162028 Universal telephony interface polarity detector Jan. 9, 2007
7155000 Process, arrangement, devices for seizure of a shared telephone line Dec. 26, 2006
RE39432 Impedance blocking filter circuit Dec. 19, 2006
RE39406 Telephone line coupler Nov. 21, 2006
7113587 Method and apparatus for non-disruptive telecommunication loop condition determination Sep. 26, 2006
7103147 Methods and apparatuses for determining loop characteristics using standard voice-band modem Sep. 5, 2006
7103178 Speech amplifier-resident mechanism for controllably supplying power to a line circuit Sep. 5, 2006
7095824 Instructive out-of-service telephone lines Aug. 22, 2006
7085370 Ringback detection circuit Aug. 1, 2006
7079637 System and method for detecting unauthorized call activity Jul. 18, 2006
7072385 Load coil and DSL repeater including same Jul. 4, 2006
7065204 Method for transmitting charging signals via a data transmission path using resonance phenomena Jun. 20, 2006
7054435 Apparatus and method for determining a minimal time bound for performing tone detection May. 30, 2006
7046755 Digital access arrangement circuitry and method for connecting to phone lines having a DC holding circuit with switchable time constants May. 16, 2006

1 2 3 4 5 6 7 8










 
 
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