JPS56165458A - Call current supply circuit - Google Patents

Call current supply circuit

Info

Publication number
JPS56165458A
JPS56165458A JP6975980A JP6975980A JPS56165458A JP S56165458 A JPS56165458 A JP S56165458A JP 6975980 A JP6975980 A JP 6975980A JP 6975980 A JP6975980 A JP 6975980A JP S56165458 A JPS56165458 A JP S56165458A
Authority
JP
Japan
Prior art keywords
circuit
supply circuit
current supply
circuits
constant
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
JP6975980A
Other languages
Japanese (ja)
Inventor
Koichi Hasegawa
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.)
NEC Corp
Original Assignee
NEC Corp
Nippon 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 NEC Corp, Nippon Electric Co Ltd filed Critical NEC Corp
Priority to JP6975980A priority Critical patent/JPS56165458A/en
Publication of JPS56165458A publication Critical patent/JPS56165458A/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
    • H04M19/001—Current supply source at the exchanger providing current to substations
    • H04M19/005—Feeding arrangements without the use of line transformers
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02D—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN INFORMATION AND COMMUNICATION TECHNOLOGIES [ICT], I.E. INFORMATION AND COMMUNICATION TECHNOLOGIES AIMING AT THE REDUCTION OF THEIR OWN ENERGY USE
    • Y02D30/00—Reducing energy consumption in communication networks
    • Y02D30/70—Reducing energy consumption in communication networks in wireless communication networks

Landscapes

  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Signal Processing (AREA)
  • Devices For Supply Of Signal Current (AREA)

Abstract

PURPOSE:To realize a reduction of power consumption at a telephone office without lowering the speech quality, by installing a constant current supply circuit having a monitor function puls a constant resistance current supply circuit which receives as on-off control by the control output of the constant current supply circuit between a telephone circuit and a power source. CONSTITUTION:With an off-hook of a telephone SUB, the current flows from a battery E through a constant current supply circuit 3 to a constant current supply circuit 4 via a subscriber circuit and the telephone SUB. With this constant current, the monitor circuits incorporated into the circuits 3 and 4 work respectively to supply the monitor output to a control circuit 5. The circuit 5 gives a proper command to constant resistance current circuits 1b and 2b based on the previous and present states of the subscriber circuit, and flows the detectable current through the circuits 3 and 4 until a calling mode is obtained and regardless of the length of the subscriber line. In a calling mode, the constant resistance current is supplied by the circuits 1b and 2b in order to preserve the speech quality.
JP6975980A 1980-05-26 1980-05-26 Call current supply circuit Pending JPS56165458A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP6975980A JPS56165458A (en) 1980-05-26 1980-05-26 Call current supply circuit

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP6975980A JPS56165458A (en) 1980-05-26 1980-05-26 Call current supply circuit

Publications (1)

Publication Number Publication Date
JPS56165458A true JPS56165458A (en) 1981-12-19

Family

ID=13412042

Family Applications (1)

Application Number Title Priority Date Filing Date
JP6975980A Pending JPS56165458A (en) 1980-05-26 1980-05-26 Call current supply circuit

Country Status (1)

Country Link
JP (1) JPS56165458A (en)

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