| |
 |
|
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:
Patents under this class:
| Patent Number |
Title Of Patent |
Date Issued |
| 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 |
| 7043012 |
Method and apparatus for ring again feature for a telephone system |
May. 9, 2006 |
| 7027587 |
System and method for deriving sealing current |
Apr. 11, 2006 |
| 7027590 |
Dynamic allocation of overhead voltage to support simultaneous transmission of signals on a telecommunication line |
Apr. 11, 2006 |
| 7020274 |
Universal apparatus and method for interfacing signals with telephony networks |
Mar. 28, 2006 |
| 7016486 |
Method for automatically switching telephone system to an on-hook state |
Mar. 21, 2006 |
| 7006623 |
Circuit for reducing voltage peak in interfacing with a telephone line |
Feb. 28, 2006 |
| 6999581 |
Event detection circuit |
Feb. 14, 2006 |
| 6980643 |
Fallback function telecommunications device |
Dec. 27, 2005 |
| 6954531 |
Software controlled ring voltage generator |
Oct. 11, 2005 |
| 6944286 |
Ground key detection circuit and method for interference-resistant detection of the activation of a ground key for telephones |
Sep. 13, 2005 |
| 6940966 |
Method and apparatus for detection of a telephone CPE alerting signal |
Sep. 6, 2005 |
| 6934384 |
Subscriber line interface circuitry |
Aug. 23, 2005 |
| 6934382 |
Method for recognizing an off-hook condition on a single subscriber line with two terminal devices |
Aug. 23, 2005 |
| 6914981 |
Communication device |
Jul. 5, 2005 |
| 6879686 |
Line take-up detection circuit |
Apr. 12, 2005 |
| 6876741 |
Device for detecting telephone line seizure |
Apr. 5, 2005 |
| 6865269 |
Method and apparatus for switch hook detection |
Mar. 8, 2005 |
| 6856685 |
Feed arrangement for a subscriber loop with multi-level current regulation capability |
Feb. 15, 2005 |
| 6813340 |
Ringing SLIC fault handling |
Nov. 2, 2004 |
| 6813343 |
Method and apparatus for filtering asymmetric digital subscriber line (ADSL) signals |
Nov. 2, 2004 |
| 6810120 |
Method of determining answer supervision at a line appearance of a public switch telephone network |
Oct. 26, 2004 |
| 6778663 |
Method and apparatus for sensing current |
Aug. 17, 2004 |
| 6778664 |
Line current protection circuit and method for linear and nonlinear hold circuit |
Aug. 17, 2004 |
| 6757378 |
Method and telecommunications center for recognizing connection requests at a subscriber line |
Jun. 29, 2004 |
|
|
|
