IE41749L - Circuit for telephone subset - Google Patents

Circuit for telephone subset

Info

Publication number
IE41749L
IE41749L IE752205A IE220575A IE41749L IE 41749 L IE41749 L IE 41749L IE 752205 A IE752205 A IE 752205A IE 220575 A IE220575 A IE 220575A IE 41749 L IE41749 L IE 41749L
Authority
IE
Ireland
Prior art keywords
outpulsing
circuit
arrangement
oct
relay
Prior art date
Application number
IE752205A
Other versions
IE41749B1 (en
Original Assignee
Int Standard Electric Corp
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 Int Standard Electric Corp filed Critical Int Standard Electric Corp
Publication of IE41749L publication Critical patent/IE41749L/en
Publication of IE41749B1 publication Critical patent/IE41749B1/en

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)
  • Devices For Supply Of Signal Current (AREA)
  • Interface Circuits In Exchanges (AREA)

Abstract

1521468 Powering substations STANDARD TELEPHONES & CABLES Ltd 7 Oct 1975 [11 Oct 1974] 44059/74 Heading H4K In a circuit arrangement for a batteryless telephone instrument and including a full wave rectifying arrangement D1-4 adapted to power the instrument from the line, a capacitor C3 maintains power to the circuit during the break periods of outpulsing. The digits of a dialled call code, entered, e.g. at a key block, are transferred to a logic control circuit (not shown) where they are transformed into a pulse stream corresponding to the code. This stream is supplied (at the "Output Drive" terminal) to an arrangement, e.g. an outpulsing relay OPR, for effecting loop disconnect signalling. A clock generator provides timing information (over the "Clock Drive" leads) to the control circuit, which is reset at the start of each call. A transistor outpulsing circuit (TR21-23) may replace the outpulsing relay, Fig. 2 (not shown). [GB1521468A]
IE2205/75A 1974-10-11 1975-10-08 Circuit arrangement for tellephone subset IE41749B1 (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB44059/74A GB1521468A (en) 1974-10-11 1974-10-11 Circuit arrangement for telephone subset

Publications (2)

Publication Number Publication Date
IE41749L true IE41749L (en) 1976-04-11
IE41749B1 IE41749B1 (en) 1980-03-12

Family

ID=10431564

Family Applications (1)

Application Number Title Priority Date Filing Date
IE2205/75A IE41749B1 (en) 1974-10-11 1975-10-08 Circuit arrangement for tellephone subset

Country Status (5)

Country Link
FR (1) FR2287813A1 (en)
GB (1) GB1521468A (en)
HK (1) HK39579A (en)
IE (1) IE41749B1 (en)
ZA (1) ZA756365B (en)

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2451690A1 (en) * 1979-03-16 1980-10-10 Horlogerie Photograph Fse Pushbutton telephone set - has power consumption reduced by controlling supply to integrated circuit incorporating call number memory
FR2505586A1 (en) * 1981-05-05 1982-11-12 Thomson Csf Mat Tel Keyboard telephone receiver with stabilised power supply - contains transistors in series with supply to control open and short circuit condition of line during dialling
FR2508744A1 (en) * 1981-06-26 1982-12-31 Thomson Csf Mat Tel Pushbutton telephone with remote supply sound amplifier - has power supply in series with microphone and earphone terminal through control circuit and uses regulator for amplifier

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB1394148A (en) * 1972-09-11 1975-05-14 Int Standard Electric Corp Push-button telphone subset

Also Published As

Publication number Publication date
ZA756365B (en) 1976-09-29
IE41749B1 (en) 1980-03-12
HK39579A (en) 1979-06-29
GB1521468A (en) 1978-08-16
FR2287813A1 (en) 1976-05-07
FR2287813B1 (en) 1979-01-05

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