JPS56114468A - Subscriber's circuit - Google Patents

Subscriber's circuit

Info

Publication number
JPS56114468A
JPS56114468A JP1605180A JP1605180A JPS56114468A JP S56114468 A JPS56114468 A JP S56114468A JP 1605180 A JP1605180 A JP 1605180A JP 1605180 A JP1605180 A JP 1605180A JP S56114468 A JPS56114468 A JP S56114468A
Authority
JP
Japan
Prior art keywords
circuit
voltage
terminals
detecting
wire line
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
JP1605180A
Other languages
Japanese (ja)
Inventor
Hideyo Murakami
Hideo Tatsuno
Takao Kunieda
Seiichiro Kozuka
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 JP1605180A priority Critical patent/JPS56114468A/en
Publication of JPS56114468A publication Critical patent/JPS56114468A/en
Pending 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
    • H04M1/738—Interface circuits for coupling substations to external telephone lines
    • H04M1/76—Compensating for differences in line impedance

Landscapes

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

Abstract

PURPOSE:To prevent an increase in calorific value performing power supply with a constant current while maintaining speech quality, by inserting or extracting an artificial line provided between a power supplying circuit and hybrid circuit. CONSTITUTION:Voltage detecting circuit 24, when detecting the output voltage of constant-current supplying circuit 23 being lower than a certain voltage, operates switches 27 and 28 to connect terminals C1 and A1, and C2 and A2, respectively. Consequently, artificial line 25 is interposed between telephone set terminal 11 and hybrid circuit 17 in addition to two-wire line 12 and capacitor 16. When the voltage is less than the certain value, terminals C1 and B1, and C2 and B2 are connected together respectively and only two-wire line 12 and capacitors 16 are connected.
JP1605180A 1980-02-14 1980-02-14 Subscriber's circuit Pending JPS56114468A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP1605180A JPS56114468A (en) 1980-02-14 1980-02-14 Subscriber's circuit

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP1605180A JPS56114468A (en) 1980-02-14 1980-02-14 Subscriber's circuit

Publications (1)

Publication Number Publication Date
JPS56114468A true JPS56114468A (en) 1981-09-09

Family

ID=11905772

Family Applications (1)

Application Number Title Priority Date Filing Date
JP1605180A Pending JPS56114468A (en) 1980-02-14 1980-02-14 Subscriber's circuit

Country Status (1)

Country Link
JP (1) JPS56114468A (en)

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