BE885083A - Circuit de detection de boucle pour systemes telephoniques - Google Patents

Circuit de detection de boucle pour systemes telephoniques

Info

Publication number
BE885083A
BE885083A BE0/201985A BE201985A BE885083A BE 885083 A BE885083 A BE 885083A BE 0/201985 A BE0/201985 A BE 0/201985A BE 201985 A BE201985 A BE 201985A BE 885083 A BE885083 A BE 885083A
Authority
BE
Belgium
Prior art keywords
detection circuit
telephone systems
loop detection
loop
telephone
Prior art date
Application number
BE0/201985A
Other languages
English (en)
Inventor
J Kitano
T Takeshita
K Hamazato
Original Assignee
Hitachi Ltd
Nippon Telegraph & Telephone
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Hitachi Ltd, Nippon Telegraph & Telephone filed Critical Hitachi Ltd
Publication of BE885083A publication Critical patent/BE885083A/fr

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
BE0/201985A 1979-09-05 1980-09-04 Circuit de detection de boucle pour systemes telephoniques BE885083A (fr)

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
BE885083A true BE885083A (fr) 1980-12-31

Family

ID=14595989

Family Applications (1)

Application Number Title Priority Date Filing Date
BE0/201985A BE885083A (fr) 1979-09-05 1980-09-04 Circuit de detection de boucle pour systemes telephoniques

Country Status (7)

Country Link
US (1) US4360709A (fr)
JP (1) JPS5637793A (fr)
BE (1) BE885083A (fr)
CA (1) CA1160778A (fr)
DE (1) DE3033037C2 (fr)
FR (1) FR2464604B1 (fr)
GB (1) GB2058519B (fr)

Families Citing this family (6)

* Cited by examiner, † Cited by third party
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 (fr) * 1985-08-20 1989-09-26 Kenji Takato Circuit d'interface pour ligne d'abonne
US8970237B2 (en) * 2012-05-07 2015-03-03 Tesla Motors, Inc. Wire break detection in redundant communications

Family Cites Families (7)

* Cited by examiner, † Cited by third party
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
JPS55100778A (en) * 1979-01-26 1980-07-31 Nippon Telegr & Teleph Corp <Ntt> Answer supervisory system

Also Published As

Publication number Publication date
CA1160778A (fr) 1984-01-17
DE3033037A1 (de) 1981-04-09
GB2058519A (en) 1981-04-08
DE3033037C2 (de) 1987-05-07
FR2464604A1 (fr) 1981-03-06
JPS5637793A (en) 1981-04-11
US4360709A (en) 1982-11-23
FR2464604B1 (fr) 1987-10-09
GB2058519B (en) 1984-01-25

Similar Documents

Publication Publication Date Title
BR7707058A (pt) Sistema de comutacao de telecomunicacoes
DK452881A (da) Telefonalarmsystem
RO74789A (fr) Raccord pour tuyaux
JPS52146507A (en) Device for processing telephone call
SE7707482L (sv) Automatisk radiotelefonanleggning
SE7706505L (sv) Fellokaliseringsanordning for digitala transmissionssystem
JPS5315159A (en) Signal processing device
BE867158A (fr) Dispositif de reception de multiplets partiels pour systemes de communications numeriques
FR2340652A1 (fr) Circuit de ligne pour installations telephoniques
JPS52149008A (en) Telephone system
AT360593B (de) Funktelefoniesystem
BR7701434A (pt) Sistema de comutacao de comunicacoes
AR226839A1 (es) Transmisor telefonico de alarma
FR2319945A1 (fr) Dispositif de protection pour systemes actifs
FR2464604B1 (fr) Circuit de detection de boucle pour systemes telephoniques
FR2485840B1 (fr) Circuit de transmission pour systemes mic
BR8002716A (pt) Sistema telefonico
ATA175777A (de) Sprechfunksystem
BE865473Q (fr) Dispositif de signalisation pour systemes de telecommunication
BR7708420A (pt) Dispositivo de acoplamento
GB1546559A (en) Multi-pary telephone system
JPS52120710A (en) Extension telephone system
BE874400A (fr) Systeme pour telecommunications de type radiomobile
JPS52147004A (en) Pushhbutton telephone system
AU2409877A (en) Fendering systems

Legal Events

Date Code Title Description
RE Patent lapsed

Owner name: NIPPON TELEGRAPH & TELEPHONE CORP.

Effective date: 19910930