KR920018756U - 송수화기 방치시의 전화기 신호수신 유지회로장치 - Google Patents
송수화기 방치시의 전화기 신호수신 유지회로장치Info
- Publication number
- KR920018756U KR920018756U KR2019910003388U KR910003388U KR920018756U KR 920018756 U KR920018756 U KR 920018756U KR 2019910003388 U KR2019910003388 U KR 2019910003388U KR 910003388 U KR910003388 U KR 910003388U KR 920018756 U KR920018756 U KR 920018756U
- Authority
- KR
- South Korea
- Prior art keywords
- handset
- circuit device
- signal reception
- telephone signal
- left unattended
- Prior art date
Links
Classifications
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04M—TELEPHONIC COMMUNICATION
- H04M1/00—Substation equipment, e.g. for use by subscribers
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04M—TELEPHONIC COMMUNICATION
- H04M3/00—Automatic or semi-automatic exchanges
- H04M3/08—Indicating faults in circuits or apparatus
- H04M3/14—Signalling existence of persistent "off-hook" condition
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04M—TELEPHONIC COMMUNICATION
- H04M1/00—Substation equipment, e.g. for use by subscribers
- H04M1/82—Line monitoring circuits for call progress or status discrimination
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04M—TELEPHONIC COMMUNICATION
- H04M19/00—Current supply arrangements for telephone systems
- H04M19/02—Current supply arrangements for telephone systems providing ringing current or supervisory tones, e.g. dialling tone or busy tone
- H04M19/04—Current supply arrangements for telephone systems providing ringing current or supervisory tones, e.g. dialling tone or busy tone the ringing-current being generated at the substations
Landscapes
- Engineering & Computer Science (AREA)
- Signal Processing (AREA)
- Telephone Set Structure (AREA)
- Telephonic Communication Services (AREA)
Priority Applications (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
KR2019910003388U KR940002280Y1 (ko) | 1991-03-14 | 1991-03-14 | 송수화기 방치시의 전화기 신호수신 유지회로장치 |
US07/820,034 US5390249A (en) | 1991-03-14 | 1992-01-14 | Receiver device for receiving ringing signals in an off-hook line condition |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
KR2019910003388U KR940002280Y1 (ko) | 1991-03-14 | 1991-03-14 | 송수화기 방치시의 전화기 신호수신 유지회로장치 |
Publications (2)
Publication Number | Publication Date |
---|---|
KR920018756U true KR920018756U (ko) | 1992-10-19 |
KR940002280Y1 KR940002280Y1 (ko) | 1994-04-13 |
Family
ID=19311701
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
KR2019910003388U KR940002280Y1 (ko) | 1991-03-14 | 1991-03-14 | 송수화기 방치시의 전화기 신호수신 유지회로장치 |
Country Status (2)
Country | Link |
---|---|
US (1) | US5390249A (ko) |
KR (1) | KR940002280Y1 (ko) |
Families Citing this family (32)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US5592529A (en) * | 1994-09-29 | 1997-01-07 | International Business Machines Corporation | Telephone inadvertent off-hook condition detector |
US5606593A (en) * | 1994-11-18 | 1997-02-25 | Lucent Technologies Inc. | Apparatus and method for automatically returning a telephone set to an on-hook condition |
US5612997A (en) * | 1995-02-02 | 1997-03-18 | Vallelonga, Sr.; Kenneth M. | Off-hook disconnect and reconnect ringer device |
US5764752A (en) * | 1996-03-15 | 1998-06-09 | South Tech Instruments, Inc. | Off-hook telephone clearing system |
KR0173403B1 (ko) * | 1996-04-25 | 1999-04-01 | 김광호 | 전화단말기의 통화로 자동복구 장치 및 그 방법 |
US6167134A (en) * | 1997-04-22 | 2000-12-26 | Silicon Laboratories, Inc. | External resistor and method to minimize power dissipation in DC holding circuitry for a communication system |
US6389134B1 (en) | 1997-04-22 | 2002-05-14 | Silicon Laboratories, Inc. | Call progress monitor circuitry and method for a communication system |
US6504864B1 (en) | 1997-04-22 | 2003-01-07 | Silicon Laboratories Inc. | Digital access arrangement circuitry and method for connecting to phone lines having a second order DC holding circuit |
US6442271B1 (en) | 1997-04-22 | 2002-08-27 | Silicon Laboratories, Inc. | Digital isolation system with low power mode |
US6385235B1 (en) | 1997-04-22 | 2002-05-07 | Silicon Laboratories, Inc. | Direct digital access arrangement circuitry and method for connecting to phone lines |
US6498825B1 (en) * | 1997-04-22 | 2002-12-24 | Silicon Laboratories Inc. | Digital access arrangement circuitry and method for connecting to phone lines having a DC holding circuit with programmable current limiting |
US6222922B1 (en) | 1997-04-22 | 2001-04-24 | Silicon Laboratories, Inc. | Loop current monitor circuitry and method for a communication system |
US6456712B1 (en) | 1997-04-22 | 2002-09-24 | Silicon Laboratories Inc. | Separation of ring detection functions across isolation barrier for minimum power |
US6339048B1 (en) * | 1999-12-23 | 2002-01-15 | Elementis Specialties, Inc. | Oil and oil invert emulsion drilling fluids with improved anti-settling properties |
US6516024B1 (en) | 1997-04-22 | 2003-02-04 | Silicon Laboratories Inc. | Digital access arrangement circuitry and method for connecting to phone lines having a DC holding circuit with low distortion and current limiting |
US6359983B1 (en) | 1997-04-22 | 2002-03-19 | Silicon Laboratories, Inc. | Digital isolation system with data scrambling |
US6442213B1 (en) | 1997-04-22 | 2002-08-27 | Silicon Laboratories Inc. | Digital isolation system with hybrid circuit in ADC calibration loop |
US6480602B1 (en) | 1997-04-22 | 2002-11-12 | Silicon Laboratories, Inc. | Ring-detect interface circuitry and method for a communication system |
US6408034B1 (en) | 1997-04-22 | 2002-06-18 | Silicon Laboratories, Inc. | Framed delta sigma data with unlikely delta sigma data patterns |
US6167132A (en) * | 1997-04-22 | 2000-12-26 | Silicon Laboratories, Inc. | Analog successive approximation (SAR) analog-to-digital converter (ADC) |
US6587560B1 (en) * | 1997-04-22 | 2003-07-01 | Silicon Laboratories Inc. | Low voltage circuits powered by the phone line |
US5870046A (en) | 1997-04-22 | 1999-02-09 | Silicon Laboratories Inc. | Analog isolation system with digital communication across a capacitive barrier |
US6307891B1 (en) | 1997-04-22 | 2001-10-23 | Silicon Laboratories, Inc. | Method and apparatus for freezing a communication link during a disruptive event |
US6160885A (en) * | 1997-04-22 | 2000-12-12 | Silicon Laboratories, Inc. | Caller ID circuit powered through hookswitch devices |
US6137827A (en) | 1997-04-22 | 2000-10-24 | Silicon Laboratories, Inc. | Isolation system with digital communication across a capacitive barrier |
US6289070B1 (en) | 1997-04-22 | 2001-09-11 | Silicon Laboratories, Inc. | Digital isolation system with ADC offset calibration including coarse offset |
US6144326A (en) | 1997-04-22 | 2000-11-07 | Silicon Laboratories, Inc. | Digital isolation system with ADC offset calibration |
US5978470A (en) * | 1997-05-14 | 1999-11-02 | Siemens Information And Communications Networks, Inc. | Signal-processing method and system for off-hook notification |
US5923731A (en) * | 1997-06-30 | 1999-07-13 | Command Communications, Inc. | Telephone monitoring and alarm device |
US6980634B1 (en) | 2002-10-16 | 2005-12-27 | James R Davis | Telephone circuit controller apparatus |
US7218713B1 (en) | 2003-04-15 | 2007-05-15 | Silicon Laboratories Inc. | Telephone line interface for DAA circuitry |
CN111556203B (zh) * | 2020-04-09 | 2021-11-19 | 深圳震有科技股份有限公司 | 座机没挂机处理方法及装置、计算机设备、可读存储介质 |
Family Cites Families (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPH0728330B2 (ja) * | 1986-10-09 | 1995-03-29 | 三洋電機株式会社 | 自動オンフック装置 |
US4922529A (en) * | 1988-12-06 | 1990-05-01 | Kiel David J | Automatic hangup apparatus for restoring service to off-hook telephones |
-
1991
- 1991-03-14 KR KR2019910003388U patent/KR940002280Y1/ko not_active IP Right Cessation
-
1992
- 1992-01-14 US US07/820,034 patent/US5390249A/en not_active Expired - Lifetime
Also Published As
Publication number | Publication date |
---|---|
KR940002280Y1 (ko) | 1994-04-13 |
US5390249A (en) | 1995-02-14 |
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Legal Events
Date | Code | Title | Description |
---|---|---|---|
A201 | Request for examination | ||
E902 | Notification of reason for refusal | ||
E701 | Decision to grant or registration of patent right | ||
REGI | Registration of establishment | ||
FPAY | Annual fee payment |
Payment date: 19970410 Year of fee payment: 4 |
|
LAPS | Lapse due to unpaid annual fee |