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KR920018756U - 송수화기 방치시의 전화기 신호수신 유지회로장치 - Google Patents

송수화기 방치시의 전화기 신호수신 유지회로장치

Info

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
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
KR2019910003388U
Other languages
English (en)
Other versions
KR940002280Y1 (ko
Inventor
박정하
Original Assignee
박정하
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by 박정하 filed Critical 박정하
Priority to KR2019910003388U priority Critical patent/KR940002280Y1/ko
Priority to US07/820,034 priority patent/US5390249A/en
Publication of KR920018756U publication Critical patent/KR920018756U/ko
Application granted granted Critical
Publication of KR940002280Y1 publication Critical patent/KR940002280Y1/ko
Anticipated expiration legal-status Critical
Expired - Fee Related legal-status Critical Current

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)
  • Telephonic Communication Services (AREA)
  • Telephone Set Structure (AREA)
KR2019910003388U 1991-03-14 1991-03-14 송수화기 방치시의 전화기 신호수신 유지회로장치 Expired - Fee Related KR940002280Y1 (ko)

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 Expired - Fee Related 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)

* Cited by examiner, † Cited by third party
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
US6408034B1 (en) 1997-04-22 2002-06-18 Silicon Laboratories, Inc. Framed delta sigma data with unlikely delta sigma data patterns
US6289070B1 (en) 1997-04-22 2001-09-11 Silicon Laboratories, Inc. Digital isolation system with ADC offset calibration including coarse offset
US6307891B1 (en) 1997-04-22 2001-10-23 Silicon Laboratories, Inc. Method and apparatus for freezing a communication link during a disruptive event
US5870046A (en) 1997-04-22 1999-02-09 Silicon Laboratories Inc. Analog isolation system with digital communication across a capacitive barrier
US6160885A (en) * 1997-04-22 2000-12-12 Silicon Laboratories, Inc. Caller ID circuit powered through hookswitch devices
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
US6137827A (en) 1997-04-22 2000-10-24 Silicon Laboratories, Inc. Isolation system with digital communication across a capacitive barrier
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
US6587560B1 (en) 1997-04-22 2003-07-01 Silicon Laboratories Inc. Low voltage circuits powered by the phone line
US6442271B1 (en) 1997-04-22 2002-08-27 Silicon Laboratories, Inc. Digital isolation system with low power mode
US6144326A (en) 1997-04-22 2000-11-07 Silicon Laboratories, Inc. Digital isolation system with ADC offset calibration
US6480602B1 (en) 1997-04-22 2002-11-12 Silicon Laboratories, Inc. Ring-detect interface circuitry and method for a communication system
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
US6167132A (en) * 1997-04-22 2000-12-26 Silicon Laboratories, Inc. Analog successive approximation (SAR) analog-to-digital converter (ADC)
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
US6359983B1 (en) 1997-04-22 2002-03-19 Silicon Laboratories, Inc. Digital isolation system with data scrambling
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
US6442213B1 (en) 1997-04-22 2002-08-27 Silicon Laboratories Inc. Digital isolation system with hybrid circuit in ADC calibration loop
US6385235B1 (en) * 1997-04-22 2002-05-07 Silicon Laboratories, Inc. Direct digital access arrangement circuitry and method for connecting to phone lines
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)

* Cited by examiner, † Cited by third party
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

Also Published As

Publication number Publication date
KR940002280Y1 (ko) 1994-04-13
US5390249A (en) 1995-02-14

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Legal Events

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E701 Decision to grant or registration of patent right
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