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Class Information
Number: 379/382
Name: Telephonic communications > Supervisory or control line signaling > Using line or loop condition detection (e.g., line circuit) > For ring trip or polarity reversal detection
Description: Subject matter including detection of a change in the polarity of the potential difference across the line or loop, or of an off-hook condition of the called terminal to cause cessation of the alerting signal.
Patents under this class:
| Patent Number |
Title Of Patent |
Date Issued |
| 7254230 |
Subscriber line interface circuitry |
Aug. 7, 2007 |
| 7197138 |
Programmable device and methods for disabling a ring signal in response to a detected off-hook condition |
Mar. 27, 2007 |
| 7162027 |
Voice messaging system caller ring bypass control |
Jan. 9, 2007 |
| 7158633 |
Method and apparatus for monitoring subscriber loop interface circuitry power dissipation |
Jan. 2, 2007 |
| RE39406 |
Telephone line coupler |
Nov. 21, 2006 |
| 7103175 |
Systems and methods for an electronic hook switch for customer premises equipment |
Sep. 5, 2006 |
| 7099462 |
Silent ringing with reduced device sizes |
Aug. 29, 2006 |
| 7095824 |
Instructive out-of-service telephone lines |
Aug. 22, 2006 |
| 7092512 |
Call control device and call control method |
Aug. 15, 2006 |
| 7085373 |
Circuit and method for detecting AC voltage pulses |
Aug. 1, 2006 |
| 6999581 |
Event detection circuit |
Feb. 14, 2006 |
| 6980643 |
Fallback function telecommunications device |
Dec. 27, 2005 |
| 6978008 |
Zero crossing detection circuit |
Dec. 20, 2005 |
| 6940970 |
Ring boost circuit to extend ringing range of telephone SLICs |
Sep. 6, 2005 |
| 6934384 |
Subscriber line interface circuitry |
Aug. 23, 2005 |
| 6925178 |
Returning ringing signals through the tip amplifier of subscriber-line interface circuitry |
Aug. 2, 2005 |
| 6920220 |
Pre-zero crossing signal generator for sinusoidal voltages with DC offsets such as telephone ring voltages |
Jul. 19, 2005 |
| 6879686 |
Line take-up detection circuit |
Apr. 12, 2005 |
| 6868156 |
Non-voice signal repeater for speech coders |
Mar. 15, 2005 |
| 6853723 |
High impedance polarity detector |
Feb. 8, 2005 |
| 6845157 |
Linear polarity guard and method for DSL-ready pots devices |
Jan. 18, 2005 |
| 6700974 |
Switching power supply for generating a ringing voltage |
Mar. 2, 2004 |
| 6687370 |
Method and an arrangement for securing an ADSL connection |
Feb. 3, 2004 |
| 6665397 |
Telephone signal detecting circuit |
Dec. 16, 2003 |
| 6631190 |
Telephone system |
Oct. 7, 2003 |
| 6625276 |
Method and circuit for detecting ring and caller-ID signals |
Sep. 23, 2003 |
| 6590973 |
System and method for detecting an off-hook condition |
Jul. 8, 2003 |
| 6570984 |
Ring trip detection circuit and method for subscriber line interface |
May. 27, 2003 |
| 6556673 |
Telephone ring signal detector |
Apr. 29, 2003 |
| 6449360 |
Cleaning method for telephone number list and system implemented therefor |
Sep. 10, 2002 |
| 6411694 |
Arrangement for improving a telephone system |
Jun. 25, 2002 |
| 6393123 |
Method and modem circuit for determining connection status of a phone line |
May. 21, 2002 |
| 6359983 |
Digital isolation system with data scrambling |
Mar. 19, 2002 |
| 6351528 |
Integrated ringer for short telephone lines |
Feb. 26, 2002 |
| 6219417 |
Ring trip detection in a communication system |
Apr. 17, 2001 |
| 6191684 |
Remote supply circuitry |
Feb. 20, 2001 |
| 6185296 |
Ring trip circuit for stopping call signal at different timing from zero-crossing point of call signal |
Feb. 6, 2001 |
| 6178241 |
Switch hook status determination in a communication system |
Jan. 23, 2001 |
| 6173040 |
Telephone line state detecting device |
Jan. 9, 2001 |
| 6160885 |
Caller ID circuit powered through hookswitch devices |
Dec. 12, 2000 |
| 6141414 |
Data access arrangement having combined remote hang-up/ring detection circuitry |
Oct. 31, 2000 |
| 6044149 |
Device for detecting DTMF tones |
Mar. 28, 2000 |
| 6026159 |
Integrated ringer for short telephone lines |
Feb. 15, 2000 |
| 5987120 |
Device for identifying line reversal/ringing signal of a telephone set |
Nov. 16, 1999 |
| 5982878 |
Combined loop current sink, battery detector, and ringing detector circuit |
Nov. 9, 1999 |
| 5978471 |
Method and device for detecting a ringtrip |
Nov. 2, 1999 |
| 5943419 |
Subscriber circuit with built-in polarity switching circuit |
Aug. 24, 1999 |
| 5943418 |
Ring-trip circuit |
Aug. 24, 1999 |
| 5920624 |
Telephone ring signal detector |
Jul. 6, 1999 |
| 5915014 |
Communication system |
Jun. 22, 1999 |
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