JPS55138963A - Network control device - Google Patents

Network control device

Info

Publication number
JPS55138963A
JPS55138963A JP4751279A JP4751279A JPS55138963A JP S55138963 A JPS55138963 A JP S55138963A JP 4751279 A JP4751279 A JP 4751279A JP 4751279 A JP4751279 A JP 4751279A JP S55138963 A JPS55138963 A JP S55138963A
Authority
JP
Japan
Prior art keywords
circuit
capacitor
power supply
terminal equipment
telephone
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.)
Pending
Application number
JP4751279A
Other languages
Japanese (ja)
Inventor
Kanji Murata
Masao Hashizume
Kyoichi Nakakawara
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.)
Toshiba Corp
Nippon Telegraph and Telephone Corp
Original Assignee
Toshiba Corp
Nippon Telegraph and Telephone Corp
Tokyo Shibaura Electric Co Ltd
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 Toshiba Corp, Nippon Telegraph and Telephone Corp, Tokyo Shibaura Electric Co Ltd filed Critical Toshiba Corp
Priority to JP4751279A priority Critical patent/JPS55138963A/en
Publication of JPS55138963A publication Critical patent/JPS55138963A/en
Pending 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

Abstract

PURPOSE:To make electric power source such as cells or commercial power supply, etc. unnecessary, by making a terminal equipment calling signal coming in by a telephone circuit a working power supply of the supervisory circuit, and storing voltage appearing in the telephone circuit at a normal time in the capacitor and utilizing it. CONSTITUTION:At a normal time, the capacitor 18 is charged with electric power supply by use of voltage of telephone circuits L1, L2 through a diode 20 and a resistor 19. In case of calling, the polarity of L1, L2 is inverted and simultaneously a calling signal is sent out. When the diodes 20 and 21 become conducting and nonconducting, respectively by the polarity inversion and a Zener diode 22 becomes conducting, a transistor TR23 conducts by a small current flowing in a resistor 24, and the capacitor 18 discharges electricity. This discharged current flows into the calling signal receiving circuit 15, when a signal which calls the terminal equipment 12 has been detected in course of operation of the circuit 15, a trigger signal is output to a thyristor 16, the thyristor 16 conducts, and the terminal equipment 12 is connected to the telephone circuit.
JP4751279A 1979-04-18 1979-04-18 Network control device Pending JPS55138963A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP4751279A JPS55138963A (en) 1979-04-18 1979-04-18 Network control device

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP4751279A JPS55138963A (en) 1979-04-18 1979-04-18 Network control device

Publications (1)

Publication Number Publication Date
JPS55138963A true JPS55138963A (en) 1980-10-30

Family

ID=12777154

Family Applications (1)

Application Number Title Priority Date Filing Date
JP4751279A Pending JPS55138963A (en) 1979-04-18 1979-04-18 Network control device

Country Status (1)

Country Link
JP (1) JPS55138963A (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS6160057A (en) * 1984-08-31 1986-03-27 Clarion Co Ltd Signal transmission controller
JPS61166271A (en) * 1985-01-17 1986-07-26 Matsushita Graphic Commun Syst Inc Network control circuit

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5034253A (en) * 1973-07-26 1975-04-02
JPS50159204A (en) * 1974-06-11 1975-12-23

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5034253A (en) * 1973-07-26 1975-04-02
JPS50159204A (en) * 1974-06-11 1975-12-23

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS6160057A (en) * 1984-08-31 1986-03-27 Clarion Co Ltd Signal transmission controller
JPS61166271A (en) * 1985-01-17 1986-07-26 Matsushita Graphic Commun Syst Inc Network control circuit

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