IT8522983A0 - Circuito di stato di linea telefonica. - Google Patents
Circuito di stato di linea telefonica.Info
- Publication number
- IT8522983A0 IT8522983A0 IT8522983A IT2298385A IT8522983A0 IT 8522983 A0 IT8522983 A0 IT 8522983A0 IT 8522983 A IT8522983 A IT 8522983A IT 2298385 A IT2298385 A IT 2298385A IT 8522983 A0 IT8522983 A0 IT 8522983A0
- Authority
- IT
- Italy
- Prior art keywords
- telephone line
- line status
- status circuit
- circuit
- telephone
- Prior art date
Links
Classifications
-
- 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
-
- 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)
- Sub-Exchange Stations And Push- Button Telephones (AREA)
- Meter Arrangements (AREA)
- Analogue/Digital Conversion (AREA)
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
CA000483829A CA1233924A (en) | 1985-06-12 | 1985-06-12 | Telephone line status circuit |
Publications (2)
Publication Number | Publication Date |
---|---|
IT8522983A0 true IT8522983A0 (it) | 1985-11-26 |
IT1186394B IT1186394B (it) | 1987-11-26 |
Family
ID=4130695
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
IT22983/85A IT1186394B (it) | 1985-06-12 | 1985-11-26 | Circuito di stato di linea telefonica |
Country Status (8)
Country | Link |
---|---|
US (1) | US4734933A (it) |
JP (1) | JPS61288696A (it) |
CN (1) | CN85109245A (it) |
CA (1) | CA1233924A (it) |
DE (1) | DE3618896A1 (it) |
FR (1) | FR2583601A1 (it) |
GB (1) | GB2176372B (it) |
IT (1) | IT1186394B (it) |
Families Citing this family (15)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4803718A (en) * | 1987-03-06 | 1989-02-07 | Tree Technologies Corporation | Hold detecting and control circuit for a key telephone system |
JPH01177295A (ja) * | 1988-01-06 | 1989-07-13 | Toshiba Corp | 電子式構内交換機 |
US4887289A (en) * | 1988-08-29 | 1989-12-12 | New York Telephone Company | Remote testing of a trunk leading to an automatic call distributor |
US5109409A (en) * | 1989-12-15 | 1992-04-28 | Alcatel Na, Inc. | Apparatus and method to detect telephony signaling states |
US5311588A (en) * | 1991-02-19 | 1994-05-10 | Intervoice, Inc. | Call progress detection circuitry and method |
ES2048046B1 (es) * | 1991-08-30 | 1996-08-01 | Telefonica Nacional Espana Co | Equipo adaptador para extension distante de centralita privada de abonado |
US5742671A (en) * | 1992-10-22 | 1998-04-21 | Tandy Corporation | Self-adjusting telephone line status detection indication |
DE4309847C2 (de) * | 1993-03-26 | 1996-11-14 | Siemens Ag | ISDN-Kommunikationssystem |
US5388153A (en) * | 1993-03-26 | 1995-02-07 | At&T Corp. | Apparatus and method for detecting telephone line status |
US5408525A (en) * | 1994-05-24 | 1995-04-18 | General Instrument Corporation Of Delaware | Diverter interface between two telecommunication lines and a station set |
KR0143315B1 (ko) * | 1995-07-04 | 1998-08-01 | 김광호 | 무선전화기에서 병렬 연결된 전화기의 사용유무 판단회로 및 방법 |
US5896446A (en) * | 1996-07-29 | 1999-04-20 | Mars Incorporated | Coin operated telephone auditor |
KR100293935B1 (ko) | 1998-07-07 | 2001-07-12 | 윤종용 | 교환기의중계선상태그래픽출력방법 |
US6173040B1 (en) * | 1999-04-07 | 2001-01-09 | Well Communication Co. | Telephone line state detecting device |
CN103344874B (zh) * | 2013-06-28 | 2015-08-19 | 清华大学 | 一种有源屏蔽布线的检测电路 |
Family Cites Families (12)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
GB1491707A (en) * | 1974-06-21 | 1977-11-16 | Marconi Co Ltd | Processor equipments |
DE2522089C2 (de) * | 1975-05-17 | 1983-12-08 | Telefonbau Und Normalzeit Gmbh, 6000 Frankfurt | Schaltungsanordnung zum Erkennen und Auswerten von Schleifenzustandsänderungen von Teilnehmeranschlußleitungen in zentral gesteuerten Fernsprechanlagen |
JPS54151310A (en) * | 1978-05-20 | 1979-11-28 | Aiphone Co Ltd | Potential scanning system |
US4276447A (en) * | 1978-08-11 | 1981-06-30 | Hitachi, Ltd. | Signal processing apparatus for subscriber circuits |
US4338495A (en) * | 1979-03-06 | 1982-07-06 | Tie/Communications, Inc. | Electronic key telephone systems |
DE2912744C2 (de) * | 1979-03-30 | 1985-01-24 | Siemens AG, 1000 Berlin und 8000 München | Verfahren für Fernsprech- und Fernsprechnebenstellenanlagen mit zyklischem Abtasten von Verbindungsleitungen unter Zuhilfenahme eines zentral angeordneten Speichers |
CA1143812A (en) * | 1979-07-23 | 1983-03-29 | Fahim Ahmed | Distributed control memory network |
DE2939009A1 (de) * | 1979-09-26 | 1981-04-09 | Siemens AG, 1000 Berlin und 8000 München | Schaltungsanordnung zur feststellung des schaltzustandes einer teilnehmeranschlussleitung in fernsprechvermittlungsanlagen |
US4310725A (en) * | 1980-01-17 | 1982-01-12 | Solid State Systems, Inc. | Interface for private branch exchange |
US4398064A (en) * | 1981-12-28 | 1983-08-09 | Gte Automatic Electric Labs Inc. | Call-for-service and continuity sensor circuit |
US4446338A (en) * | 1982-07-12 | 1984-05-01 | Northern Telecom Limited | Telephone lines status sensor |
JPS5919675A (ja) * | 1982-07-27 | 1984-02-01 | Toshiba Corp | 半導体樹脂バリ除去装置 |
-
1985
- 1985-06-12 CA CA000483829A patent/CA1233924A/en not_active Expired
- 1985-10-29 GB GB8526598A patent/GB2176372B/en not_active Expired
- 1985-11-04 US US06/794,696 patent/US4734933A/en not_active Expired - Lifetime
- 1985-11-26 IT IT22983/85A patent/IT1186394B/it active
- 1985-12-19 CN CN198585109245A patent/CN85109245A/zh active Pending
-
1986
- 1986-06-05 DE DE19863618896 patent/DE3618896A1/de active Granted
- 1986-06-09 FR FR8608429A patent/FR2583601A1/fr not_active Withdrawn
- 1986-06-11 JP JP61137234A patent/JPS61288696A/ja active Pending
Also Published As
Publication number | Publication date |
---|---|
CA1233924A (en) | 1988-03-08 |
DE3618896A1 (de) | 1986-12-18 |
CN85109245A (zh) | 1986-12-10 |
GB8526598D0 (en) | 1985-12-04 |
DE3618896C2 (it) | 1990-03-08 |
JPS61288696A (ja) | 1986-12-18 |
FR2583601A1 (fr) | 1986-12-19 |
US4734933A (en) | 1988-03-29 |
GB2176372B (en) | 1989-07-05 |
GB2176372A (en) | 1986-12-17 |
IT1186394B (it) | 1987-11-26 |
Similar Documents
Publication | Publication Date | Title |
---|---|---|
IT8222273A0 (it) | Circuito di interfaccia di linea telefonica a stato solido, concapacita' di chiamata. | |
DE3650344D1 (de) | Übertragungsendgerät. | |
DE3586033D1 (de) | Schnurloses fernsprechsystem. | |
IT8321325A0 (it) | Circuito di completamento di chiamate. | |
DE3580958D1 (de) | Fernsprechgeraet. | |
DE3687153T2 (de) | Teilnehmerschnittstellenschaltung. | |
IT1144160B (it) | Sistema di accesso multiplo di terminali su una linea telefonica numerica | |
IT8522983A0 (it) | Circuito di stato di linea telefonica. | |
DE3681506D1 (de) | Tragbares elektronisches notizgeraet. | |
DE3688351T2 (de) | Fernsprecher. | |
IT8021866A0 (it) | Circuito di linea telefonica. | |
IT8523030A0 (it) | Valigetta per una apparecchiatura telefonica portatile. | |
IT8419796A0 (it) | Circuito per ricevere segnali di chiamata su una linea telefonica. | |
IT8423869A0 (it) | Circuito telefonico di risposta mediante sintetizzazione vocale. | |
IT8620618A0 (it) | Circuito di collegamento. | |
DE3677235D1 (de) | Reihenklemmenblock. | |
NO820856L (no) | Elektrisk kopling. | |
IT8521729A0 (it) | Circuito di linea a corrente costante. | |
DK416987D0 (da) | Telefonliniegraenseflademodul | |
IT8467922A1 (it) | Congiuntore di abbonato telefonico. | |
IT8523054A0 (it) | Circuito di alimentazione per apparecchi telefonici. | |
IT1176928B (it) | Sistema di segreteria telefonica | |
KR840003458U (ko) | 접 속 단 자 | |
ES531640A0 (es) | Un circuito de proteccion con circuito de linea de telecomunicacion | |
IT1209056B (it) | Simulatore-analizzatore di apparecchiature telefoniche. |
Legal Events
Date | Code | Title | Description |
---|---|---|---|
TA | Fee payment date (situation as of event date), data collected since 19931001 |
Effective date: 19961129 |