FR2282198A1 - Keyboard telephone for long lines - uses speech loop current to power MOS circuit - Google Patents

Keyboard telephone for long lines - uses speech loop current to power MOS circuit

Info

Publication number
FR2282198A1
FR2282198A1 FR7427904A FR7427904A FR2282198A1 FR 2282198 A1 FR2282198 A1 FR 2282198A1 FR 7427904 A FR7427904 A FR 7427904A FR 7427904 A FR7427904 A FR 7427904A FR 2282198 A1 FR2282198 A1 FR 2282198A1
Authority
FR
France
Prior art keywords
circuit
speech
loop current
long lines
power mos
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.)
Granted
Application number
FR7427904A
Other languages
French (fr)
Other versions
FR2282198B1 (en
Inventor
Albert Belfils
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.)
Telecommunications Radioelectriques et Telephoniques SA TRT
Original Assignee
Telecommunications Radioelectriques et Telephoniques SA TRT
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 Telecommunications Radioelectriques et Telephoniques SA TRT filed Critical Telecommunications Radioelectriques et Telephoniques SA TRT
Priority to FR7427904A priority Critical patent/FR2282198A1/en
Publication of FR2282198A1 publication Critical patent/FR2282198A1/en
Application granted granted Critical
Publication of FR2282198B1 publication Critical patent/FR2282198B1/fr
Granted legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04M—TELEPHONIC COMMUNICATION
    • H04M19/00—Current supply arrangements for telephone systems
    • H04M19/08—Current supply arrangements for telephone systems with current supply sources at the substations
    • 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

Abstract

The speech parts (3) of this telephone are connected across the line via two series transistors (13, 61) one of which provides a stable voltage to an oscillator circuit (10) whose rectified output is connected to a MOS clock generator (6). This is controlled by a keyboard dial. During calling, one output (14) of the MOS circuit breaks the series circuit of the speech circuit and another output (8) saturates a shunt transistor (9) across those speech circuits in coincidence with the signalling code. In this way, signalling power is derived from the speech loop current and the circuit is designed to operate on very long lines.
FR7427904A 1974-08-12 1974-08-12 Keyboard telephone for long lines - uses speech loop current to power MOS circuit Granted FR2282198A1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
FR7427904A FR2282198A1 (en) 1974-08-12 1974-08-12 Keyboard telephone for long lines - uses speech loop current to power MOS circuit

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
FR7427904A FR2282198A1 (en) 1974-08-12 1974-08-12 Keyboard telephone for long lines - uses speech loop current to power MOS circuit

Publications (2)

Publication Number Publication Date
FR2282198A1 true FR2282198A1 (en) 1976-03-12
FR2282198B1 FR2282198B1 (en) 1978-01-27

Family

ID=9142339

Family Applications (1)

Application Number Title Priority Date Filing Date
FR7427904A Granted FR2282198A1 (en) 1974-08-12 1974-08-12 Keyboard telephone for long lines - uses speech loop current to power MOS circuit

Country Status (1)

Country Link
FR (1) FR2282198A1 (en)

Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2465384A1 (en) * 1979-09-17 1981-03-20 Philips Nv ELECTRONIC TELEPHONY DEVICE CONNECTED TO A SIGNAL TRANSMISSION LINE
FR2466152A1 (en) * 1979-09-20 1981-03-27 Int Standard Electric Corp Subscriber line connection adaptor - procures power for accessory unit and has constant current and voltage limiter elements
FR2517150A1 (en) * 1981-11-20 1983-05-27 Thomson Csf Mat Tel MICROPROCESSOR MANAGED MICROPROCESSOR CIRCUIT WITH INTEGRATED 2-WIRE 4-WIRE TRANSMISSION CIRCUIT AND CURRENT LINE BACKUP POWER SUPPLY
FR2534755A1 (en) * 1982-10-15 1984-04-20 Telephonie Ind Commerciale Input interface for telephone set.
FR2556909A1 (en) * 1983-12-14 1985-06-21 Radiotechnique Compelec INTERFACE DEVICE FOR TELEPHONE SET
WO1985003614A1 (en) * 1984-02-08 1985-08-15 Moses Klaus M Circuit arrangement for the electric supply of devices in a telephone set
EP0198360A2 (en) * 1985-04-16 1986-10-22 Siemens Nixdorf Informationssysteme Aktiengesellschaft Circuit for the remote powering of subscriber connecting devices in telephone exchanges
EP0259247A1 (en) * 1986-08-26 1988-03-09 KRONE Aktiengesellschaft Circuitry for a telephone set

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB1298449A (en) * 1970-02-12 1972-12-06 Gen Electric Company Ltd Forme Improvements in or relating to telephone instruments
CH544461A (en) * 1972-06-29 1973-11-15 Autophon Ag Telephone subscriber station for generating series of pulses preselected using a keyboard
DE2258839A1 (en) * 1972-12-01 1974-06-20 Bosse Telefonbau Gmbh METHOD FOR GENERATING SERIAL DC PULSES ON COMMUNICATION LINES

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB1298449A (en) * 1970-02-12 1972-12-06 Gen Electric Company Ltd Forme Improvements in or relating to telephone instruments
CH544461A (en) * 1972-06-29 1973-11-15 Autophon Ag Telephone subscriber station for generating series of pulses preselected using a keyboard
DE2258839A1 (en) * 1972-12-01 1974-06-20 Bosse Telefonbau Gmbh METHOD FOR GENERATING SERIAL DC PULSES ON COMMUNICATION LINES

Cited By (13)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2465384A1 (en) * 1979-09-17 1981-03-20 Philips Nv ELECTRONIC TELEPHONY DEVICE CONNECTED TO A SIGNAL TRANSMISSION LINE
FR2466152A1 (en) * 1979-09-20 1981-03-27 Int Standard Electric Corp Subscriber line connection adaptor - procures power for accessory unit and has constant current and voltage limiter elements
FR2517150A1 (en) * 1981-11-20 1983-05-27 Thomson Csf Mat Tel MICROPROCESSOR MANAGED MICROPROCESSOR CIRCUIT WITH INTEGRATED 2-WIRE 4-WIRE TRANSMISSION CIRCUIT AND CURRENT LINE BACKUP POWER SUPPLY
EP0080396A1 (en) * 1981-11-20 1983-06-01 Thomson-Csf Telephone Integrated circuit microprocessor-controlled telephone two wire/four wire transmission circuit, and line current safeguard powering
US4562309A (en) * 1981-11-20 1985-12-31 Thomson-Csf Telephone Telephone circuit controlled by a 2 wire - 4 wire transmission integrated circuit microprocessor with line current emergency supply
FR2534755A1 (en) * 1982-10-15 1984-04-20 Telephonie Ind Commerciale Input interface for telephone set.
EP0146183A1 (en) * 1983-12-14 1985-06-26 Rtc-Compelec Interface arrangement for a subscriber set
FR2556909A1 (en) * 1983-12-14 1985-06-21 Radiotechnique Compelec INTERFACE DEVICE FOR TELEPHONE SET
WO1985003614A1 (en) * 1984-02-08 1985-08-15 Moses Klaus M Circuit arrangement for the electric supply of devices in a telephone set
EP0169584A1 (en) * 1984-02-08 1986-01-29 Patentverwertungs GmbH Lange & Partner Circuit for electrically powering devices in a subscriber set
EP0198360A2 (en) * 1985-04-16 1986-10-22 Siemens Nixdorf Informationssysteme Aktiengesellschaft Circuit for the remote powering of subscriber connecting devices in telephone exchanges
EP0198360A3 (en) * 1985-04-16 1988-03-23 Nixdorf Computer Aktiengesellschaft Circuit for the remote powering of subscriber connecting devices in telephone exchanges
EP0259247A1 (en) * 1986-08-26 1988-03-09 KRONE Aktiengesellschaft Circuitry for a telephone set

Also Published As

Publication number Publication date
FR2282198B1 (en) 1978-01-27

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Legal Events

Date Code Title Description
ST Notification of lapse