JPS57129063A - Subscriber's circuit - Google Patents

Subscriber's circuit

Info

Publication number
JPS57129063A
JPS57129063A JP1429181A JP1429181A JPS57129063A JP S57129063 A JPS57129063 A JP S57129063A JP 1429181 A JP1429181 A JP 1429181A JP 1429181 A JP1429181 A JP 1429181A JP S57129063 A JPS57129063 A JP S57129063A
Authority
JP
Japan
Prior art keywords
circuit
resistance
subscriber
converter
executed
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
JP1429181A
Other languages
Japanese (ja)
Inventor
Hideo Tatsuno
Fumio Mano
Hideyo Murakami
Yoichi Maeda
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.)
Nippon Telegraph and Telephone Corp
Original Assignee
Nippon Telegraph and Telephone 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 Nippon Telegraph and Telephone Corp filed Critical Nippon Telegraph and Telephone Corp
Priority to JP1429181A priority Critical patent/JPS57129063A/en
Publication of JPS57129063A publication Critical patent/JPS57129063A/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

Landscapes

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

Abstract

PURPOSE:To overcome difficuly caused by power consumption of a subscriber's circuit for making the titled device into IC, by executing the impedance matching to a subscriber's line by use of a circuit containing a negative impedance converter and a resistance in a power supply. CONSTITUTION:In a subscriber's circuit, a negative impedance converter 9 for generating the negative impedance in the working frequency band is connected, also DC feed to a subscriber's line 1 is executed through a resistance 8 from a power supply 10, and the impedance matching to the line 1 is executed by the circuit containing the converter 9 and the resistance 8. As for subscriber current, constant-resistance feed is executed by 2 pieces of resistances 8 from the electric power supply 10. Also, in the signal frequency band, a resistance portion of the resistance 8 is eliminated by the negative impedance generated by the converter 9. In this way, the resistance 8 whose power consumption is large is installed to the outside of a circuit to be made into IC, therefore, electric power required for the converter 9 and a hybrid circuit 5 is reduced, and the circuit is changed to IC.
JP1429181A 1981-02-04 1981-02-04 Subscriber's circuit Pending JPS57129063A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP1429181A JPS57129063A (en) 1981-02-04 1981-02-04 Subscriber's circuit

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP1429181A JPS57129063A (en) 1981-02-04 1981-02-04 Subscriber's circuit

Publications (1)

Publication Number Publication Date
JPS57129063A true JPS57129063A (en) 1982-08-10

Family

ID=11856981

Family Applications (1)

Application Number Title Priority Date Filing Date
JP1429181A Pending JPS57129063A (en) 1981-02-04 1981-02-04 Subscriber's circuit

Country Status (1)

Country Link
JP (1) JPS57129063A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0582439A1 (en) * 1992-08-06 1994-02-09 AT&T Corp. Subscriber line interface circuit with impedance synthesis

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0582439A1 (en) * 1992-08-06 1994-02-09 AT&T Corp. Subscriber line interface circuit with impedance synthesis

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