DE69323101D1 - Vorrichtung zum Begrenzen der Arbeitsspannung für mechanische Schalter im Fernsprechwesen - Google Patents

Vorrichtung zum Begrenzen der Arbeitsspannung für mechanische Schalter im Fernsprechwesen

Info

Publication number
DE69323101D1
DE69323101D1 DE69323101T DE69323101T DE69323101D1 DE 69323101 D1 DE69323101 D1 DE 69323101D1 DE 69323101 T DE69323101 T DE 69323101T DE 69323101 T DE69323101 T DE 69323101T DE 69323101 D1 DE69323101 D1 DE 69323101D1
Authority
DE
Germany
Prior art keywords
telephony
limiting
working voltage
mechanical switches
switches
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 - Fee Related
Application number
DE69323101T
Other languages
English (en)
Other versions
DE69323101T2 (de
Inventor
Antonio Andreini
Pietro Consiglio
Pietro Erratico
Enrico Maria Alfonso Ravanelli
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.)
STMicroelectronics SRL
Original Assignee
STMicroelectronics SRL
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 STMicroelectronics SRL filed Critical STMicroelectronics SRL
Application granted granted Critical
Publication of DE69323101D1 publication Critical patent/DE69323101D1/de
Publication of DE69323101T2 publication Critical patent/DE69323101T2/de
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
    • 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
    • H04M1/26—Devices for calling a subscriber
    • H04M1/30—Devices which can set up and transmit only one digit at a time
    • H04M1/31—Devices which can set up and transmit only one digit at a time by interrupting current to generate trains of pulses; by periodically opening and closing contacts to generate trains of pulses
    • H04M1/312—Devices which can set up and transmit only one digit at a time by interrupting current to generate trains of pulses; by periodically opening and closing contacts to generate trains of pulses pulses produced by electronic circuits
    • 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

Landscapes

  • Engineering & Computer Science (AREA)
  • Signal Processing (AREA)
  • Devices For Supply Of Signal Current (AREA)
  • Telephone Function (AREA)
  • Emergency Protection Circuit Devices (AREA)
DE69323101T 1992-02-17 1993-02-12 Vorrichtung zum Begrenzen der Arbeitsspannung für mechanische Schalter im Fernsprechwesen Expired - Fee Related DE69323101T2 (de)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
ITMI920339A IT1254796B (it) 1992-02-17 1992-02-17 Dispositivo di limitazione della tensione operativa per interruttori meccanici in telefonia.

Publications (2)

Publication Number Publication Date
DE69323101D1 true DE69323101D1 (de) 1999-03-04
DE69323101T2 DE69323101T2 (de) 1999-06-02

Family

ID=11362009

Family Applications (1)

Application Number Title Priority Date Filing Date
DE69323101T Expired - Fee Related DE69323101T2 (de) 1992-02-17 1993-02-12 Vorrichtung zum Begrenzen der Arbeitsspannung für mechanische Schalter im Fernsprechwesen

Country Status (5)

Country Link
US (2) US5448636A (de)
EP (1) EP0556744B1 (de)
JP (1) JPH066423A (de)
DE (1) DE69323101T2 (de)
IT (1) IT1254796B (de)

Families Citing this family (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE69532885D1 (de) * 1995-07-28 2004-05-19 St Microelectronics Srl Störungsklingelunterdrückungsvorrichtung, insbesondere für Zusatzklingeln in Stecktelephonsystemen
US5859906A (en) * 1996-11-19 1999-01-12 Thomson Consumer Electronics, Inc. Telephone switch hook interface circuit
US6160887A (en) * 1997-05-02 2000-12-12 Goodrich; Patrick Telephone loop-current regulator
US5982878A (en) * 1997-05-15 1999-11-09 Hubbell Incorporated Combined loop current sink, battery detector, and ringing detector circuit
US6252957B1 (en) 1998-10-07 2001-06-26 Teledex Corporation Low power line selection circuit for a telephone
WO2000036813A1 (en) * 1998-12-16 2000-06-22 Conexant Systems, Inc. Telephone line interface circuit without hookswitch
US7487899B2 (en) * 2004-07-28 2009-02-10 Ethicon Endo-Surgery, Inc. Surgical instrument incorporating EAP complete firing system lockout mechanism
US8905977B2 (en) 2004-07-28 2014-12-09 Ethicon Endo-Surgery, Inc. Surgical stapling instrument having an electroactive polymer actuated medical substance dispenser

Family Cites Families (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CA1136783A (en) * 1980-09-23 1982-11-30 Guy J. Chaput Telephone circuit
FR2504323B1 (fr) * 1981-04-16 1985-10-31 Radiotechnique Compelec Poste telephonique d'abonne muni d'un dispositif de protection contre les surtensions
US4634814A (en) * 1985-02-04 1987-01-06 Gte Communication Systems Corp. Surge protected electronic switch for telephone voiceband circuits
DE3538088C2 (de) * 1985-10-25 1993-11-11 Siemens Ag Schaltungsanordnung für einen Überspannungsschutz in elektronischen Fernsprechstationen
US4715058A (en) * 1986-04-23 1987-12-22 Siemens Aktiengesellschaft Protective circuit for the overvoltage protection of a subscriber line interconnect circuit
DE3623017A1 (de) * 1986-07-09 1988-01-14 Telefonbau & Normalzeit Gmbh Schaltungsanordnung fuer den gabelumschalter eines fernsprechendgeraetes
GB2193414B (en) * 1986-07-14 1990-01-04 Siliconix Ltd Telephone instrument
JPS6383853U (de) * 1986-11-20 1988-06-01
FR2616277B1 (fr) * 1987-06-05 1990-12-07 Thomson Semiconducteurs Circuit pour poste telephonique incorporant une protection contre les surcharges de tension
DE3840434A1 (de) * 1988-12-01 1990-06-07 Philips Patentverwaltung Schaltungsanordnung fuer uebertragungseinrichtungen

Also Published As

Publication number Publication date
EP0556744B1 (de) 1999-01-20
JPH066423A (ja) 1994-01-14
IT1254796B (it) 1995-10-11
US5602914A (en) 1997-02-11
ITMI920339A1 (it) 1993-08-17
US5448636A (en) 1995-09-05
ITMI920339A0 (it) 1992-02-17
DE69323101T2 (de) 1999-06-02
EP0556744A1 (de) 1993-08-25

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Legal Events

Date Code Title Description
8364 No opposition during term of opposition
8339 Ceased/non-payment of the annual fee