DE3581252D1 - Detektionsschaltung des uebergangs. - Google Patents
Detektionsschaltung des uebergangs.Info
- Publication number
- DE3581252D1 DE3581252D1 DE8585306630T DE3581252T DE3581252D1 DE 3581252 D1 DE3581252 D1 DE 3581252D1 DE 8585306630 T DE8585306630 T DE 8585306630T DE 3581252 T DE3581252 T DE 3581252T DE 3581252 D1 DE3581252 D1 DE 3581252D1
- Authority
- DE
- Germany
- Prior art keywords
- detection circuit
- transition detection
- transition
- circuit
- detection
- 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
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
Landscapes
- Engineering & Computer Science (AREA)
- Signal Processing (AREA)
- Interface Circuits In Exchanges (AREA)
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US06/655,372 US4631362A (en) | 1984-09-27 | 1984-09-27 | Low resistance origination scan circuit |
Publications (1)
Publication Number | Publication Date |
---|---|
DE3581252D1 true DE3581252D1 (de) | 1991-02-14 |
Family
ID=24628624
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
DE8585306630T Expired - Fee Related DE3581252D1 (de) | 1984-09-27 | 1985-09-18 | Detektionsschaltung des uebergangs. |
Country Status (5)
Country | Link |
---|---|
US (1) | US4631362A (de) |
EP (1) | EP0177219B1 (de) |
JP (1) | JPS6188695A (de) |
CA (1) | CA1238733A (de) |
DE (1) | DE3581252D1 (de) |
Families Citing this family (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US5745563A (en) * | 1992-02-25 | 1998-04-28 | Harris Corporation | Telephone subscriber line circuit, components and methods |
AU2548497A (en) * | 1996-03-29 | 1997-10-22 | Motorola, Inc. | Method and apparatus for off-hook detection |
US5757896A (en) * | 1996-05-31 | 1998-05-26 | Lucent Technologies Inc. | Method and apparatus for preventing pin fraud on coin telephones that use battery reversal pulses to meter charges |
US5910985A (en) * | 1997-06-23 | 1999-06-08 | Siemens Information And Communication Networks, Inc. | Ground start and tip ground detection without the use of -48V or tip bait circuit |
Family Cites Families (15)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3855420A (en) * | 1973-03-26 | 1974-12-17 | Bell Lab Inc | Supervisory circuit |
IT1063854B (it) * | 1976-04-06 | 1985-02-18 | Sits Soc It Telecom Siemens | Disposizione circuitale per la rilevazione di criteri telefonici |
US4099032A (en) * | 1977-03-25 | 1978-07-04 | Wescom, Inc. | Loop current detector |
FR2462070A1 (fr) * | 1979-07-17 | 1981-02-06 | Cit Alcatel | Dispositif d'alimentation d'un poste d'abonne |
JPS5637793A (en) * | 1979-09-05 | 1981-04-11 | Hitachi Ltd | Loop detecting circuit |
DE2939009A1 (de) * | 1979-09-26 | 1981-04-09 | Siemens AG, 1000 Berlin und 8000 München | Schaltungsanordnung zur feststellung des schaltzustandes einer teilnehmeranschlussleitung in fernsprechvermittlungsanlagen |
JPS6022571B2 (ja) * | 1979-12-05 | 1985-06-03 | 株式会社日立製作所 | 地絡保護方式 |
US4358645A (en) * | 1980-08-05 | 1982-11-09 | Motorola, Inc. | Loop sensing circuit for use with a subscriber loop interface circuit |
US4322586A (en) * | 1980-11-13 | 1982-03-30 | Northern Telecom Limited | Transformerless line interface circuit |
US4406929A (en) * | 1981-02-26 | 1983-09-27 | Motorola Inc. | Hook status detector for a subscriber loop interface circuit |
US4451703A (en) * | 1981-12-30 | 1984-05-29 | Stromberg-Carlson Corporation | All electronic interface for telephony system |
US4454477A (en) * | 1982-04-28 | 1984-06-12 | At&T Bell Laboratories | Loop current detector with threshold setting impedance |
US4419542A (en) * | 1982-05-17 | 1983-12-06 | Bell Telephone Laboratories, Incorporated | Battery feed circuit |
US4473719A (en) * | 1982-05-17 | 1984-09-25 | At&T Bell Laboratories | Switchhook status detector |
US4563547A (en) * | 1983-03-07 | 1986-01-07 | At&T Bell Laboratories | Loop-start/ground-start line interface circuit |
-
1984
- 1984-09-27 US US06/655,372 patent/US4631362A/en not_active Expired - Fee Related
-
1985
- 1985-09-17 CA CA000490921A patent/CA1238733A/en not_active Expired
- 1985-09-18 DE DE8585306630T patent/DE3581252D1/de not_active Expired - Fee Related
- 1985-09-18 EP EP85306630A patent/EP0177219B1/de not_active Expired
- 1985-09-27 JP JP60214395A patent/JPS6188695A/ja active Pending
Also Published As
Publication number | Publication date |
---|---|
EP0177219A3 (en) | 1987-01-14 |
US4631362A (en) | 1986-12-23 |
CA1238733A (en) | 1988-06-28 |
EP0177219A2 (de) | 1986-04-09 |
EP0177219B1 (de) | 1991-01-09 |
JPS6188695A (ja) | 1986-05-06 |
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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 |