CA963189A - Line circuit for telephone installation - Google Patents
Line circuit for telephone installationInfo
- Publication number
- CA963189A CA963189A CA142,170A CA142170A CA963189A CA 963189 A CA963189 A CA 963189A CA 142170 A CA142170 A CA 142170A CA 963189 A CA963189 A CA 963189A
- Authority
- CA
- Canada
- Prior art keywords
- line circuit
- telephone installation
- telephone
- installation
- circuit
- 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
Links
Classifications
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04M—TELEPHONIC COMMUNICATION
- H04M3/00—Automatic or semi-automatic exchanges
- H04M3/005—Interface circuits for subscriber lines
Landscapes
- Engineering & Computer Science (AREA)
- Signal Processing (AREA)
- Devices For Supply Of Signal Current (AREA)
- Interface Circuits In Exchanges (AREA)
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
FR717119835A FR2138548B1 (de) | 1971-05-19 | 1971-05-19 |
Publications (1)
Publication Number | Publication Date |
---|---|
CA963189A true CA963189A (en) | 1975-02-18 |
Family
ID=9077931
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
CA142,170A Expired CA963189A (en) | 1971-05-19 | 1972-05-15 | Line circuit for telephone installation |
Country Status (7)
Country | Link |
---|---|
US (1) | US3808378A (de) |
JP (1) | JPS4745516A (de) |
CA (1) | CA963189A (de) |
DE (1) | DE2221717C3 (de) |
FR (1) | FR2138548B1 (de) |
GB (1) | GB1383587A (de) |
IT (1) | IT950709B (de) |
Families Citing this family (9)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS5711199B2 (de) * | 1974-12-25 | 1982-03-03 | ||
FR2324181A1 (fr) * | 1975-09-12 | 1977-04-08 | Lannionnais Electronique | Dispositif de detection de boucle d'une ligne d'abonne |
CH604453A5 (de) * | 1976-06-25 | 1978-09-15 | Ibm | |
FR2383568A1 (fr) * | 1977-03-08 | 1978-10-06 | Trt Telecom Radio Electr | Dispositif destine a engendrer un signal d'appel et utilisable notamment dans un joncteur d'abonne |
FR2386210A1 (fr) * | 1977-03-31 | 1978-10-27 | Ibm France | Circuit de ligne telephonique |
US4211896A (en) * | 1977-10-17 | 1980-07-08 | Telecommunications Radioelectrique Et Telephoniques T.R.T. | Subscriber's circuit with a symmetrical amplifier |
JPS5940343B2 (ja) * | 1978-01-31 | 1984-09-29 | 日本電気株式会社 | 電話交換機における交流電流送出用トランク |
WO1982001635A1 (en) * | 1980-10-28 | 1982-05-13 | Lyne Francis T | Improvements in or relating to line interface circuits |
EP0589231B1 (de) * | 1992-09-24 | 1997-10-22 | Siemens Aktiengesellschaft | Teilnehmeranschlusssatz für den Anschluss einer Fernsprechnebenstellenanlage an eine öffentliche Fernsprechvermittlungsstelle |
Family Cites Families (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
BE756517A (fr) * | 1969-09-23 | 1971-03-01 | Ericsson Telefon Ab L M | Interrupteur pour signaux d'appel de centraux telephoniques automatiques |
-
1971
- 1971-05-19 FR FR717119835A patent/FR2138548B1/fr not_active Expired
-
1972
- 1972-03-24 IT IT22321/72A patent/IT950709B/it active
- 1972-04-28 GB GB1981872A patent/GB1383587A/en not_active Expired
- 1972-05-04 DE DE2221717A patent/DE2221717C3/de not_active Expired
- 1972-05-15 CA CA142,170A patent/CA963189A/en not_active Expired
- 1972-05-16 US US00253718A patent/US3808378A/en not_active Expired - Lifetime
- 1972-05-19 JP JP3457972A patent/JPS4745516A/ja active Pending
Also Published As
Publication number | Publication date |
---|---|
JPS4745516A (de) | 1972-12-25 |
GB1383587A (en) | 1974-02-12 |
DE2221717C3 (de) | 1980-05-29 |
IT950709B (it) | 1973-06-20 |
US3808378A (en) | 1974-04-30 |
FR2138548B1 (de) | 1973-05-25 |
DE2221717A1 (de) | 1972-12-07 |
FR2138548A1 (de) | 1973-01-05 |
DE2221717B2 (de) | 1979-09-13 |
Similar Documents
Publication | Publication Date | Title |
---|---|---|
CA968479A (en) | Telephone answering system | |
CA960389A (en) | Control circuit for key telephone system | |
AU467786B2 (en) | Line protector fora communication circuit | |
CA956376A (en) | Terminal for flexible circuits | |
CA978628A (en) | Electronic communication switching system | |
CA923644A (en) | Line circuit for key telephone system | |
CA963189A (en) | Line circuit for telephone installation | |
CA936981A (en) | Telephone answering system | |
AU467813B2 (en) | Line circuit fora key telephone system | |
CA949245A (en) | Telephone subscriber line circuit | |
CA924425A (en) | Hold circuit for multi-line key telephone system | |
CA992228A (en) | Key telephone line circuit | |
CA944878A (en) | Supervisory circuit arrangement for telephone subscriber lines | |
CA972881A (en) | Telephone auto-answering device | |
AU467646B2 (en) | Multiplex circuit | |
CA930883A (en) | Telephone circuits | |
AU4958472A (en) | Line synchronising circuit | |
AU458841B2 (en) | Telephone system | |
CA885011A (en) | Supervisory circuit for telephone lines | |
CA938040A (en) | Telephone subscriber line circuit | |
CA939091A (en) | Long-line telephone circuit | |
CA976678A (en) | Conversation-circuit mounting-plate for an automatic telephone switchboard | |
CA870836A (en) | Line circuit scanner for electronic telephone systems | |
CA913819A (en) | Telephone anti-sidetone circuit | |
CA998485A (en) | Line circuit for key telephone systems |