JPS5637793A - Loop detecting circuit - Google Patents
Loop detecting circuitInfo
- Publication number
- JPS5637793A JPS5637793A JP11280679A JP11280679A JPS5637793A JP S5637793 A JPS5637793 A JP S5637793A JP 11280679 A JP11280679 A JP 11280679A JP 11280679 A JP11280679 A JP 11280679A JP S5637793 A JPS5637793 A JP S5637793A
- Authority
- JP
- Japan
- Prior art keywords
- trq
- loop
- line current
- resistances
- earth
- 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.)
- Pending
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
Priority Applications (7)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP11280679A JPS5637793A (en) | 1979-09-05 | 1979-09-05 | Loop detecting circuit |
GB8028149A GB2058519B (en) | 1979-09-05 | 1980-09-01 | Telephone line loop detecting circuit |
DE3033037A DE3033037C2 (de) | 1979-09-05 | 1980-09-02 | Schaltungsanordnung zur Schleifenstromüberwachung von Fernsprechteilnehmerleitungen |
FR8019048A FR2464604B1 (fr) | 1979-09-05 | 1980-09-03 | Circuit de detection de boucle pour systemes telephoniques |
US06/184,182 US4360709A (en) | 1979-09-05 | 1980-09-04 | Loop detecting circuit |
BE0/201985A BE885083A (fr) | 1979-09-05 | 1980-09-04 | Circuit de detection de boucle pour systemes telephoniques |
CA000359491A CA1160778A (en) | 1979-09-05 | 1980-09-05 | Loop detecting circuit |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP11280679A JPS5637793A (en) | 1979-09-05 | 1979-09-05 | Loop detecting circuit |
Publications (1)
Publication Number | Publication Date |
---|---|
JPS5637793A true JPS5637793A (en) | 1981-04-11 |
Family
ID=14595989
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP11280679A Pending JPS5637793A (en) | 1979-09-05 | 1979-09-05 | Loop detecting circuit |
Country Status (7)
Country | Link |
---|---|
US (1) | US4360709A (ja) |
JP (1) | JPS5637793A (ja) |
BE (1) | BE885083A (ja) |
CA (1) | CA1160778A (ja) |
DE (1) | DE3033037C2 (ja) |
FR (1) | FR2464604B1 (ja) |
GB (1) | GB2058519B (ja) |
Families Citing this family (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4439634A (en) * | 1982-04-02 | 1984-03-27 | Gte Automatic Electric Incorporated | Carrier subscriber telephone off-hook detector |
US4631362A (en) * | 1984-09-27 | 1986-12-23 | At&T Bell Laboratories | Low resistance origination scan circuit |
US4731827A (en) * | 1984-10-29 | 1988-03-15 | David Systems, Inc. | Interswitch line circuit |
HU192925B (en) * | 1985-03-29 | 1987-08-28 | Bhg Hiradastech Vallalat | Circuit arrangement for realizing circuit sensing state of loop, in particular to processor controlled digital sub-exchanges |
CA1260170A (en) * | 1985-08-20 | 1989-09-26 | Kenji Takato | Subscriber line interface circuit |
US8970237B2 (en) * | 2012-05-07 | 2015-03-03 | Tesla Motors, Inc. | Wire break detection in redundant communications |
Citations (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS55100778A (en) * | 1979-01-26 | 1980-07-31 | Nippon Telegr & Teleph Corp <Ntt> | Answer supervisory system |
Family Cites Families (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
GB1200909A (en) * | 1967-11-30 | 1970-08-05 | Standard Telephones Cables Ltd | Loop current detector |
BE754235A (fr) * | 1969-08-05 | 1970-12-31 | Western Electric Co | Circuit de supervision pour lignes telephoniques |
US3781571A (en) * | 1971-12-06 | 1973-12-25 | Int Standard Electric Corp | Loop current detector |
GB1563803A (en) * | 1975-11-26 | 1980-04-02 | Post Office | Telecommunications transmission and signalling curcuits |
US4099032A (en) * | 1977-03-25 | 1978-07-04 | Wescom, Inc. | Loop current detector |
US4203012A (en) * | 1977-07-14 | 1980-05-13 | Boxall Frank S | Hybrid circuit using current mirror circuits |
-
1979
- 1979-09-05 JP JP11280679A patent/JPS5637793A/ja active Pending
-
1980
- 1980-09-01 GB GB8028149A patent/GB2058519B/en not_active Expired
- 1980-09-02 DE DE3033037A patent/DE3033037C2/de not_active Expired
- 1980-09-03 FR FR8019048A patent/FR2464604B1/fr not_active Expired
- 1980-09-04 US US06/184,182 patent/US4360709A/en not_active Expired - Lifetime
- 1980-09-04 BE BE0/201985A patent/BE885083A/fr not_active IP Right Cessation
- 1980-09-05 CA CA000359491A patent/CA1160778A/en not_active Expired
Patent Citations (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS55100778A (en) * | 1979-01-26 | 1980-07-31 | Nippon Telegr & Teleph Corp <Ntt> | Answer supervisory system |
Also Published As
Publication number | Publication date |
---|---|
CA1160778A (en) | 1984-01-17 |
DE3033037A1 (de) | 1981-04-09 |
GB2058519A (en) | 1981-04-08 |
DE3033037C2 (de) | 1987-05-07 |
FR2464604A1 (fr) | 1981-03-06 |
BE885083A (fr) | 1980-12-31 |
US4360709A (en) | 1982-11-23 |
FR2464604B1 (fr) | 1987-10-09 |
GB2058519B (en) | 1984-01-25 |
Similar Documents
Publication | Publication Date | Title |
---|---|---|
JPS5637793A (en) | Loop detecting circuit | |
SE7712127L (sv) | Automatisk signalnivaregleringskrets for anvendning i telefonapparater | |
JPS5425145A (en) | Detection circuit for unbalanced dc voltage of output amplifier on two-power- supply system | |
ES537753A0 (es) | Perfeccionamientos en los circuitos telefonicos | |
JPS5425446A (en) | Blushless exciter protective device | |
JPS5368010A (en) | Ring trip circuit | |
JPS5266914A (en) | Speed controlling circuit of dc motor | |
JPS5357941A (en) | Multiplier using hall element | |
JPS52149322A (en) | Soft starting circuit of commutation circuit | |
JPS5328469A (en) | Digital tester | |
JPS5290049A (en) | Earth detection circuit | |
JPS5637762A (en) | Ground-fault detecting circuit | |
JPS5376077A (en) | Voltage applied current measuring circuit | |
JPS5438546A (en) | Stabilized power circuit | |
JPS5457144A (en) | Overcurrent detector | |
JPS54112109A (en) | Ring trip system | |
JPS54109882A (en) | Battery voltage detecting circuit | |
JPS5442638A (en) | Circuit breaker | |
JPS54120516A (en) | Transmission system for alternating current signal | |
JPS5339011A (en) | Transmission circuit | |
JPS52148173A (en) | Resistance/electric signal converter | |
JPS53123786A (en) | Level detection circuit | |
JPS544346A (en) | Protective circuit for ac switching circuit | |
JPS5287619A (en) | Potential device | |
JPS55163462A (en) | Resistance detection circuit |