NL172909C - Inschakelketen voor een wekker van een telefoontoesel. - Google Patents

Inschakelketen voor een wekker van een telefoontoesel.

Info

Publication number
NL172909C
NL172909C NLAANVRAGE7709731,A NL7709731A NL172909C NL 172909 C NL172909 C NL 172909C NL 7709731 A NL7709731 A NL 7709731A NL 172909 C NL172909 C NL 172909C
Authority
NL
Netherlands
Prior art keywords
chain
switch
alarm clock
alarm
clock
Prior art date
Application number
NLAANVRAGE7709731,A
Other languages
English (en)
Other versions
NL7709731A (nl
Original Assignee
Cselt Centro Studi Lab Telecom
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 Cselt Centro Studi Lab Telecom filed Critical Cselt Centro Studi Lab Telecom
Publication of NL7709731A publication Critical patent/NL7709731A/nl
Application granted granted Critical
Publication of NL172909C publication Critical patent/NL172909C/nl

Links

Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04M—TELEPHONIC COMMUNICATION
    • H04M1/00—Substation equipment, e.g. for use by subscribers
    • H04M1/738—Interface circuits for coupling substations to external telephone lines
    • H04M1/74—Interface circuits for coupling substations to external telephone lines with means for reducing interference; with means for reducing effects due to line faults
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04M—TELEPHONIC COMMUNICATION
    • H04M1/00—Substation equipment, e.g. for use by subscribers
    • H04M1/738—Interface circuits for coupling substations to external telephone lines
    • H04M1/74—Interface circuits for coupling substations to external telephone lines with means for reducing interference; with means for reducing effects due to line faults
    • H04M1/745—Protection devices or circuits for voltages surges on the line

Landscapes

  • Engineering & Computer Science (AREA)
  • Signal Processing (AREA)
  • Devices For Supply Of Signal Current (AREA)
  • Monitoring And Testing Of Exchanges (AREA)
  • Interface Circuits In Exchanges (AREA)
  • Sub-Exchange Stations And Push- Button Telephones (AREA)
  • Telephonic Communication Services (AREA)
NLAANVRAGE7709731,A 1976-11-12 1977-09-02 Inschakelketen voor een wekker van een telefoontoesel. NL172909C (nl)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
IT69699/76A IT1071838B (it) 1976-11-12 1976-11-12 Soppressore di impulsi di suoneria indesiderati per apparecchi telefonici

Publications (2)

Publication Number Publication Date
NL7709731A NL7709731A (nl) 1978-05-17
NL172909C true NL172909C (nl) 1983-11-01

Family

ID=11312657

Family Applications (1)

Application Number Title Priority Date Filing Date
NLAANVRAGE7709731,A NL172909C (nl) 1976-11-12 1977-09-02 Inschakelketen voor een wekker van een telefoontoesel.

Country Status (8)

Country Link
US (1) US4152549A (nl)
JP (1) JPS5361903A (nl)
DE (1) DE2749458C3 (nl)
FR (1) FR2371100A1 (nl)
GB (1) GB1586690A (nl)
IT (1) IT1071838B (nl)
NL (1) NL172909C (nl)
SE (1) SE7712613L (nl)

Families Citing this family (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4213012A (en) * 1978-11-03 1980-07-15 General Signal Corporation Discriminating means for telephone circuits
US4529844A (en) * 1983-09-26 1985-07-16 Dong Jun Industrial Co., Ltd. Pulse output telephone system with ring tap elimination
SE459138B (sv) * 1987-10-08 1989-06-05 Ericsson Telefon Ab L M Anordning i ett telekommunikationssystem vid inkoppling och urkoppling av en ringsignal
IT1254795B (it) * 1992-02-17 1995-10-11 St Microelectronics Srl Dispositivo di soppressione di retroazione acustica particolarmente per suonerie ausiliarie in impianti telefonici a spina.
US5465297A (en) * 1994-03-11 1995-11-07 Design Tech International Inc. Telephone line seizure circuit
EP0756409B1 (en) * 1995-07-28 2004-04-14 STMicroelectronics S.r.l. Spurious ting suppression device particularly for auxiliary ringers in socket telephone systems
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 (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR1465926A (fr) * 1966-01-26 1967-01-13 Ericsson Telefon Ab L M Dispositif semi-conducteur à seuil utilisé dans un circuit téléphonique pour empêcher le courant continu de passer et éteindre les étincelles
GB1318870A (en) * 1969-07-09 1973-05-31 Gen Electric Co Ltd Telephone apparatus incorporating a tone caller
JPS5148847B2 (nl) * 1971-11-10 1976-12-23
DE2205559C3 (de) * 1972-02-07 1980-08-14 Telefonbau Und Normalzeit Gmbh, 6000 Frankfurt Schaltungsanordnung für Wechselstrom-Anrufempfangsstrecken zur Verhinderung der Einwirkung von Gleichstromimpulsen
FR2269251A1 (en) * 1974-04-26 1975-11-21 Trt Telecom Radio Electr Telephone receiver with ringing apparatus - has bell permanently across line with shunt to prevent outgoing calls ringing local bell
US4031332A (en) * 1976-02-02 1977-06-21 Cook Electric Company Telephone ringer insolator

Also Published As

Publication number Publication date
NL7709731A (nl) 1978-05-17
IT1071838B (it) 1985-04-10
JPS5361903A (en) 1978-06-02
DE2749458A1 (de) 1978-05-18
SE7712613L (sv) 1979-05-13
DE2749458B2 (de) 1979-02-01
US4152549A (en) 1979-05-01
GB1586690A (en) 1981-03-25
FR2371100A1 (fr) 1978-06-09
FR2371100B1 (nl) 1981-09-11
DE2749458C3 (de) 1986-07-31

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Legal Events

Date Code Title Description
V1 Lapsed because of non-payment of the annual fee