GB1571203A - Apparatus for monitoring the on/off-hook status of a telephone set connected to a telephone network - Google Patents

Apparatus for monitoring the on/off-hook status of a telephone set connected to a telephone network Download PDF

Info

Publication number
GB1571203A
GB1571203A GB22582/77A GB2258277A GB1571203A GB 1571203 A GB1571203 A GB 1571203A GB 22582/77 A GB22582/77 A GB 22582/77A GB 2258277 A GB2258277 A GB 2258277A GB 1571203 A GB1571203 A GB 1571203A
Authority
GB
United Kingdom
Prior art keywords
voltage
signal
wires
wire
sequence
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.)
Expired
Application number
GB22582/77A
Other languages
English (en)
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
International Business Machines Corp
Original Assignee
International Business Machines Corp
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 International Business Machines Corp filed Critical International Business Machines Corp
Publication of GB1571203A publication Critical patent/GB1571203A/en
Expired legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04M—TELEPHONIC COMMUNICATION
    • H04M3/00—Automatic or semi-automatic exchanges
    • H04M3/22—Arrangements for supervision, monitoring or testing
    • H04M3/2272—Subscriber line supervision circuits, e.g. call detection circuits
    • 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
    • H04M19/026—Arrangements for interrupting the ringing current

Landscapes

  • Engineering & Computer Science (AREA)
  • Signal Processing (AREA)
  • Telephonic Communication Services (AREA)
  • Interface Circuits In Exchanges (AREA)
  • Devices For Supply Of Signal Current (AREA)
  • Monitoring And Testing Of Exchanges (AREA)
GB22582/77A 1976-06-25 1977-05-27 Apparatus for monitoring the on/off-hook status of a telephone set connected to a telephone network Expired GB1571203A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CH814476A CH604453A5 (US06346242-20020212-C00066.png) 1976-06-25 1976-06-25

Publications (1)

Publication Number Publication Date
GB1571203A true GB1571203A (en) 1980-07-09

Family

ID=4335821

Family Applications (1)

Application Number Title Priority Date Filing Date
GB22582/77A Expired GB1571203A (en) 1976-06-25 1977-05-27 Apparatus for monitoring the on/off-hook status of a telephone set connected to a telephone network

Country Status (8)

Country Link
US (1) US4110569A (US06346242-20020212-C00066.png)
JP (1) JPS531407A (US06346242-20020212-C00066.png)
CA (1) CA1073569A (US06346242-20020212-C00066.png)
CH (1) CH604453A5 (US06346242-20020212-C00066.png)
DE (1) DE2727731C2 (US06346242-20020212-C00066.png)
FR (1) FR2356325A1 (US06346242-20020212-C00066.png)
GB (1) GB1571203A (US06346242-20020212-C00066.png)
IT (1) IT1114807B (US06346242-20020212-C00066.png)

Families Citing this family (14)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4447673A (en) * 1977-12-27 1984-05-08 Stromberg-Carlson Corporation Ring trip apparatus for a line circuit connected to DCO switch
DE2850929C2 (de) * 1978-11-24 1982-06-09 Siemens AG, 1000 Berlin und 8000 München Schaltungsanordnung zur Unterdrückung von Störspannungseinflüssen bei der Bewertung des Signalzustandes auf Übertragungsleitungen, insbesondere auf Teilnehmeranschlußleitungen in Fernsprechanlagen
FR2470498A1 (fr) * 1979-11-21 1981-05-29 Trt Telecom Radio Electr Dispositif de detection du bouclage d'une ligne d'abonne pendant la sonnerie
US4283603A (en) * 1980-02-19 1981-08-11 Bell Telephone Laboratories, Incorporated On-hook/off-hook status check circuit
US4396805A (en) * 1981-09-21 1983-08-02 Siemens Corporation Ring trip detector for a subscriber line interface circuit
IT1155661B (it) * 1982-03-24 1987-01-28 Cselt Centro Studi Lab Telecom Circuito elettronico per la rivelazione dello sgancio del microtelefono in presenza della corrente di chiamata
FR2531296B1 (fr) * 1982-07-30 1988-04-15 Cit Alcatel Procede et dispositif de detection de boucle en phase sonnerie
IT1212838B (it) * 1983-11-23 1989-11-30 Ates Componenti Elettron Circuito telefonico, integrabile monoliticamente, per il riconoscimento dello sgancio in fase di suoneria.
US5446786A (en) * 1993-03-03 1995-08-29 Northern Telecom Limited Two-wire telecommunications line detection arrangements
DE4326894C2 (de) * 1993-08-11 1997-01-30 Sel Alcatel Ag Schaltungsanordnung zur Rufspannungsabschaltung in einer elektronischen Teilnehmerschaltung
US5600713A (en) * 1994-11-15 1997-02-04 Advanced Micro Devices, Inc. On-board ring signal generator
SE511917C2 (sv) * 1996-12-10 1999-12-13 Ericsson Telefon Ab L M Förfarande för anordning för att detektera en ringbortkoppling
US5987120A (en) * 1997-12-01 1999-11-16 Winbond Electronics Corp. Device for identifying line reversal/ringing signal of a telephone set
JP2006325088A (ja) * 2005-05-20 2006-11-30 Nec Infrontia Corp 電話装置、電話交換機及び電話回線接続方法

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2014950B2 (de) * 1970-03-28 1976-01-02 Standard Elektrik Lorenz Ag, 7000 Stuttgart Verfahren und Schaltungsanordnung zur Rufabschaltung in Fernmelde-, insbesondere Fernsprechanlagen
FR2138548B1 (US06346242-20020212-C00066.png) * 1971-05-19 1973-05-25 Ibm France
US3746798A (en) * 1972-05-23 1973-07-17 Gte Automatic Electric Lab Inc Electronic ring trip circuit
DE2357294C3 (de) * 1973-11-16 1981-11-19 Friedrich Merk Telefonbau GmbH, 8000 München Verfahren und Schaltungsanordnung zur Erkennung der Schließung einer Gleichstrom gespeisten Teilnehmerschleife in Fernmelde-, insbesondere Fernsprechanlagen
JPS5547503B2 (US06346242-20020212-C00066.png) * 1973-12-28 1980-12-01

Also Published As

Publication number Publication date
JPS531407A (en) 1978-01-09
FR2356325A1 (fr) 1978-01-20
US4110569A (en) 1978-08-29
CH604453A5 (US06346242-20020212-C00066.png) 1978-09-15
DE2727731A1 (de) 1977-12-29
DE2727731C2 (de) 1984-08-16
JPS5653902B2 (US06346242-20020212-C00066.png) 1981-12-22
IT1114807B (it) 1986-01-27
CA1073569A (en) 1980-03-11
FR2356325B1 (US06346242-20020212-C00066.png) 1980-12-19

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Legal Events

Date Code Title Description
PS Patent sealed [section 19, patents act 1949]
PCNP Patent ceased through non-payment of renewal fee