SE8003907L - Grenssnitt for elektronisk knappsats for en telefonapparat - Google Patents

Grenssnitt for elektronisk knappsats for en telefonapparat

Info

Publication number
SE8003907L
SE8003907L SE8003907A SE8003907A SE8003907L SE 8003907 L SE8003907 L SE 8003907L SE 8003907 A SE8003907 A SE 8003907A SE 8003907 A SE8003907 A SE 8003907A SE 8003907 L SE8003907 L SE 8003907L
Authority
SE
Sweden
Prior art keywords
transistors
series
shunt branch
shunt
zener diode
Prior art date
Application number
SE8003907A
Other languages
Unknown language ( )
English (en)
Inventor
V Montesi
M Besi
Original Assignee
Sits Soc It Telecom Siemens
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 Sits Soc It Telecom Siemens filed Critical Sits Soc It Telecom Siemens
Publication of SE8003907L publication Critical patent/SE8003907L/sv

Links

Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04M—TELEPHONIC COMMUNICATION
    • H04M1/00—Substation equipment, e.g. for use by subscribers
    • H04M1/26—Devices for calling a subscriber
    • H04M1/30—Devices which can set up and transmit only one digit at a time
    • H04M1/31—Devices which can set up and transmit only one digit at a time by interrupting current to generate trains of pulses; by periodically opening and closing contacts to generate trains of pulses
    • H04M1/312—Devices which can set up and transmit only one digit at a time by interrupting current to generate trains of pulses; by periodically opening and closing contacts to generate trains of pulses pulses produced by electronic circuits

Landscapes

  • Engineering & Computer Science (AREA)
  • Signal Processing (AREA)
  • Interface Circuits In Exchanges (AREA)
  • Devices For Supply Of Signal Current (AREA)
SE8003907A 1979-06-05 1980-05-27 Grenssnitt for elektronisk knappsats for en telefonapparat SE8003907L (sv)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
IT7923279A IT1202931B (it) 1979-06-05 1979-06-05 Circuito di interfaccia per tastiera elettronica con ripetizione della selezione

Publications (1)

Publication Number Publication Date
SE8003907L true SE8003907L (sv) 1980-12-06

Family

ID=11205590

Family Applications (1)

Application Number Title Priority Date Filing Date
SE8003907A SE8003907L (sv) 1979-06-05 1980-05-27 Grenssnitt for elektronisk knappsats for en telefonapparat

Country Status (10)

Country Link
US (1) US4329546A (sv)
JP (1) JPS55165057A (sv)
AR (1) AR223876A1 (sv)
BR (1) BR8003169A (sv)
DE (1) DE3021456A1 (sv)
ES (1) ES8103623A1 (sv)
FR (1) FR2458962A1 (sv)
GB (1) GB2055022A (sv)
IT (1) IT1202931B (sv)
SE (1) SE8003907L (sv)

Families Citing this family (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
NL8001136A (nl) * 1980-02-26 1981-09-16 Philips Nv Schakeling voor toepassing in een telefoontoestel.
US4413159A (en) * 1982-04-02 1983-11-01 Bell Telephone Laboratories, Incorporated Dial pulsing circuit
US4492822A (en) * 1982-09-30 1985-01-08 Alderman Robert J Telephone hold circuit with improved self-limiting amplifier for injecting an audio signal during hold conditions
DE3334988A1 (de) * 1983-09-24 1985-04-18 Elmeg Elektro-Mechanik Gmbh, 3150 Peine Schaltungsanordnung zur speisung von fernsprecheinrichtungen aus der leitung
US4555597A (en) * 1983-12-05 1985-11-26 Gte Business Communication Systems Inc. Transient resistant key operated pulse generating calling device circuit
FR2558024B1 (fr) * 1984-01-11 1986-05-16 Horlogerie Photograph Fse Clavier de numerotation telephonique protege contre les surcharges
US4634814A (en) * 1985-02-04 1987-01-06 Gte Communication Systems Corp. Surge protected electronic switch for telephone voiceband circuits
DE3538088C2 (de) * 1985-10-25 1993-11-11 Siemens Ag Schaltungsanordnung für einen Überspannungsschutz in elektronischen Fernsprechstationen
EP0593115A3 (en) * 1992-10-14 1999-02-17 Koninklijke Philips Electronics N.V. Electronic hook switch for a subscriber set
KR102659922B1 (ko) * 2018-12-21 2024-04-22 지.더블유. 리스크 컴퍼니, 인크. 본질 안전 회로부 (intrinsically safe circuitry)

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2453730A1 (de) * 1972-08-03 1976-05-20 Itt Ind Gmbh Deutsche Verfahren und schaltungsanordnung zum ueberspannungsschutz von transistoren von betriebsschaltungen eines telefonapparates
US3956596A (en) * 1973-04-10 1976-05-11 The General Electric Company Limited Circuit arrangements in telephone apparatus
GB1515503A (en) * 1974-01-15 1978-06-28 Gen Electric Co Ltd Electric impulse transmitters for telephone instruments
SE386341B (sv) * 1974-03-29 1976-08-02 Ericsson Telefon Ab L M Kopplingsanordning vid en telefonapparat innefattande en likspenningsomvandlare.
US4008379A (en) * 1975-02-14 1977-02-15 San/Bar Corporation Touch-pad to dial conversion unit

Also Published As

Publication number Publication date
DE3021456A1 (de) 1980-12-18
JPS55165057A (en) 1980-12-23
ES491359A0 (es) 1981-03-16
ES8103623A1 (es) 1981-03-16
US4329546A (en) 1982-05-11
GB2055022A (en) 1981-02-18
BR8003169A (pt) 1980-12-30
IT1202931B (it) 1989-02-15
AR223876A1 (es) 1981-09-30
IT7923279A0 (it) 1979-06-05
FR2458962A1 (fr) 1981-01-02

Similar Documents

Publication Publication Date Title
SE8003907L (sv) Grenssnitt for elektronisk knappsats for en telefonapparat
JPS63500694A (ja) 電話機ラインスイッチ
GB1415461A (en) Switching circuit for tone-ringer or like load means
US4614843A (en) Arrangement for opening the loop for a well-defined time interval from a telephone set
GB1086702A (en) Electrical calling circuits
US4390753A (en) Line interruption arrangement
GB772965A (en) Shifting registers
GB1523370A (en) Dialling devices
US3686444A (en) Telephone instruments
DK0419363T3 (da) Impulsvælgerindretning til et apparat, der er forbundet med en telefonliste
JPS5637793A (en) Loop detecting circuit
FI800892A (fi) Abonnentanslutningskoppling med jordningsknappindikation hoegohmig kopplingsbar matning samt anordning foer anropssignalgenerering
AU607195B2 (en) A circuit arrangement for a telephone station with earth connection
SU493040A1 (ru) Ответное устройство
SE8404228L (sv) Telefonkrets
SU706930A1 (ru) Ключ дл коммутации индуктивных нагрузок
ES8302988A1 (es) Mejoras en los circuitos de llamada por pulsador con senalizacion por impulsos para aparatos telefonicos.
ES8601605A1 (es) Mejoras en dispositivos de apertura controlada de linea telefonica
DK0630143T3 (da) Koblingsanordning til fødningen af digitale kommunikationsterminaler
GB1461015A (en) Electronic switch circuits
SU1368975A1 (ru) Импульсное логическое устройство
KR820001698B1 (ko) 톤 링거 회로
KR870010716A (ko) 아웃펄스 및 톤펄스 겸용방식의 전화기 회로
ES8708104A3 (es) Mejoras en los circuitos receptores de cifras en centrales telefonicas
GB1348476A (en) Telephone subscriberstation circuit arrangements

Legal Events

Date Code Title Description
NAV Patent application has lapsed

Ref document number: 8003907-6

Format of ref document f/p: F