GB1521468A - Circuit arrangement for telephone subset - Google Patents

Circuit arrangement for telephone subset

Info

Publication number
GB1521468A
GB1521468A GB44059/74A GB4405974A GB1521468A GB 1521468 A GB1521468 A GB 1521468A GB 44059/74 A GB44059/74 A GB 44059/74A GB 4405974 A GB4405974 A GB 4405974A GB 1521468 A GB1521468 A GB 1521468A
Authority
GB
United Kingdom
Prior art keywords
outpulsing
circuit
arrangement
oct
relay
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
Application number
GB44059/74A
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
STC PLC
Original Assignee
Standard Telephone and Cables PLC
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 Standard Telephone and Cables PLC filed Critical Standard Telephone and Cables PLC
Priority to GB44059/74A priority Critical patent/GB1521468A/en
Priority to ZA00756365A priority patent/ZA756365B/en
Priority to IE2205/75A priority patent/IE41749B1/en
Priority to FR7531058A priority patent/FR2287813A1/en
Publication of GB1521468A publication Critical patent/GB1521468A/en
Priority to HK395/79A priority patent/HK39579A/en
Expired legal-status Critical Current

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).
GB44059/74A 1974-10-11 1974-10-11 Circuit arrangement for telephone subset Expired GB1521468A (en)

Priority Applications (5)

Application Number Priority Date Filing Date Title
GB44059/74A GB1521468A (en) 1974-10-11 1974-10-11 Circuit arrangement for telephone subset
ZA00756365A ZA756365B (en) 1974-10-11 1975-10-08 Circuit arrangement for telephone subset
IE2205/75A IE41749B1 (en) 1974-10-11 1975-10-08 Circuit arrangement for tellephone subset
FR7531058A FR2287813A1 (en) 1974-10-11 1975-10-10 CIRCUIT FOR TELEPHONE SET WITH KEYPAD AND SIGNALING BY BREAK OF LOOP
HK395/79A HK39579A (en) 1974-10-11 1979-06-21 Circuit arrangement for telephone subset

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 (1)

Publication Number Publication Date
GB1521468A true GB1521468A (en) 1978-08-16

Family

ID=10431564

Family Applications (1)

Application Number Title Priority Date Filing Date
GB44059/74A Expired GB1521468A (en) 1974-10-11 1974-10-11 Circuit arrangement for telephone 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
HK39579A (en) 1979-06-29
ZA756365B (en) 1976-09-29
IE41749L (en) 1976-04-11
IE41749B1 (en) 1980-03-12
FR2287813B1 (en) 1979-01-05
FR2287813A1 (en) 1976-05-07

Similar Documents

Publication Publication Date Title
GB1395577A (en) Telephones
GB1501235A (en) Circuit arrangement for use in a telephone set
KR850003098A (en) Interface channel unit
GB1366984A (en) Power supply
GB1521468A (en) Circuit arrangement for telephone subset
ES453912A1 (en) Telephone ringing generators
GB1372754A (en) Tone ringer circuits
ES453914A1 (en) Telephone ringing control circuits
FR2282198A1 (en) Keyboard telephone for long lines - uses speech loop current to power MOS circuit
US4032722A (en) Telephone dialing arrangement for calling a single party
GB1360038A (en) Apparatus for blocking transmission of dialing pulses from subscriber telephone sets
GB1523370A (en) Dialling devices
GB1475575A (en) Telephone system
ES476875A1 (en) Ringing circuit for centrally controlled telephone exchange junction - has alternating signal source, and bipolar electronic switch output connected to subscriber and timer
JPS57192158A (en) Adaptor for telephone set
GB1394148A (en) Push-button telphone subset
GB1398860A (en) Operating circuit of a telephone set
SU809650A1 (en) Device for automatic calling of subscribers
JPS6376547A (en) Telephone set
JPS57180259A (en) Ringer tone generator
JPS55135461A (en) Starting system for terminal unit
TW243510B (en) Communicating system for personal computer
JPS5469686A (en) Input control system
GB1396768A (en) Ringtrip circuits
FR2291656A1 (en) Telephone numbered keyboard - replaces usual dial and can be installed without other equipment or additional supply

Legal Events

Date Code Title Description
PS Patent sealed
PE20 Patent expired after termination of 20 years

Effective date: 19951006