IT1254796B - Dispositivo di limitazione della tensione operativa per interruttori meccanici in telefonia. - Google Patents
Dispositivo di limitazione della tensione operativa per interruttori meccanici in telefonia.Info
- Publication number
- IT1254796B IT1254796B ITMI920339A ITMI920339A IT1254796B IT 1254796 B IT1254796 B IT 1254796B IT MI920339 A ITMI920339 A IT MI920339A IT MI920339 A ITMI920339 A IT MI920339A IT 1254796 B IT1254796 B IT 1254796B
- Authority
- IT
- Italy
- Prior art keywords
- terminal
- operating voltage
- limiting device
- voltage limiting
- mechanical switches
- Prior art date
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)
Abstract
Dispositivo di limitazione della tensione operativa per interruttori meccanici in telefonia la cui peculiarità consiste nel fatto di comprendere morsetti di collegamento ad una linea telefonica, da un primo morsetto si stacca un ramo di collegamento ed alimentazione per una circuiteria di controllo presentante un primo interruttore al cui terminale di uscita sono collegati il morsetto di catodo di un primo diodo zener ed il morsetto di source di un primo transistore MOSFET, il cui morsetto di gate è collegato con il morsetto di anodo di detto diodo zener a detto primo morsetto. Sono previsti mezzi di regolazione della corrente assorbita dal dispositivo.
Priority Applications (6)
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. |
EP93102240A EP0556744B1 (en) | 1992-02-17 | 1993-02-12 | Device for limiting the working voltage for mechanical switches in telephony |
DE69323101T DE69323101T2 (de) | 1992-02-17 | 1993-02-12 | Vorrichtung zum Begrenzen der Arbeitsspannung für mechanische Schalter im Fernsprechwesen |
JP5025663A JPH066423A (ja) | 1992-02-17 | 1993-02-15 | 電話通信の機構スイッチ用動作電圧を制限する装置 |
US08/017,789 US5448636A (en) | 1992-02-17 | 1993-02-16 | Device for limiting the working voltage mechanical switches in telephony |
US08/509,773 US5602914A (en) | 1992-02-17 | 1995-08-01 | Device for limiting the working voltage for mechanical switches in telephony |
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 (3)
Publication Number | Publication Date |
---|---|
ITMI920339A0 ITMI920339A0 (it) | 1992-02-17 |
ITMI920339A1 ITMI920339A1 (it) | 1993-08-17 |
IT1254796B true IT1254796B (it) | 1995-10-11 |
Family
ID=11362009
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
ITMI920339A IT1254796B (it) | 1992-02-17 | 1992-02-17 | Dispositivo di limitazione della tensione operativa per interruttori meccanici in telefonia. |
Country Status (5)
Country | Link |
---|---|
US (2) | US5448636A (it) |
EP (1) | EP0556744B1 (it) |
JP (1) | JPH066423A (it) |
DE (1) | DE69323101T2 (it) |
IT (1) | IT1254796B (it) |
Families Citing this family (8)
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 |
EP1142292A1 (en) * | 1998-12-16 | 2001-10-10 | 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)
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 (it) * | 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 |
-
1992
- 1992-02-17 IT ITMI920339A patent/IT1254796B/it active IP Right Grant
-
1993
- 1993-02-12 EP EP93102240A patent/EP0556744B1/en not_active Expired - Lifetime
- 1993-02-12 DE DE69323101T patent/DE69323101T2/de not_active Expired - Fee Related
- 1993-02-15 JP JP5025663A patent/JPH066423A/ja not_active Withdrawn
- 1993-02-16 US US08/017,789 patent/US5448636A/en not_active Expired - Fee Related
-
1995
- 1995-08-01 US US08/509,773 patent/US5602914A/en not_active Expired - Lifetime
Also Published As
Publication number | Publication date |
---|---|
DE69323101T2 (de) | 1999-06-02 |
US5602914A (en) | 1997-02-11 |
ITMI920339A0 (it) | 1992-02-17 |
JPH066423A (ja) | 1994-01-14 |
ITMI920339A1 (it) | 1993-08-17 |
EP0556744B1 (en) | 1999-01-20 |
US5448636A (en) | 1995-09-05 |
DE69323101D1 (de) | 1999-03-04 |
EP0556744A1 (en) | 1993-08-25 |
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Legal Events
Date | Code | Title | Description |
---|---|---|---|
0001 | Granted | ||
TA | Fee payment date (situation as of event date), data collected since 19931001 |
Effective date: 19970506 |