JPS54151307A - Supply circuit for communication current - Google Patents

Supply circuit for communication current

Info

Publication number
JPS54151307A
JPS54151307A JP6025878A JP6025878A JPS54151307A JP S54151307 A JPS54151307 A JP S54151307A JP 6025878 A JP6025878 A JP 6025878A JP 6025878 A JP6025878 A JP 6025878A JP S54151307 A JPS54151307 A JP S54151307A
Authority
JP
Japan
Prior art keywords
terminals
alternating signal
supply circuit
communication
differential
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
JP6025878A
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 JP6025878A priority Critical patent/JPS54151307A/en
Publication of JPS54151307A publication Critical patent/JPS54151307A/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

Landscapes

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

Abstract

PURPOSE:To increase the impedance of differential alternating signal of the communication path and to avoid attenuation of the communication signal, by providing a pair of differential input operational amplifiers with the communication current supply circuit and connecting the first input terminals of the amplifier with a capacitor. CONSTITUTION:A pair of telephone lines are connected to the terminals 1, 2, and ground, -48V cell are connected respectively to the terminals 3, 4. If a DC load is present between the terminals 1 and 2, the circuit between the terminals 3, 1 and 2, 4 plays as a constant current supply circuit, which supplies current to the DC load via transistors 9, 10. To the differential alternating signal between the terminals 1 and 2, the capacitor 21 and the resistors around it operate as a low pass filter, and no alternating signal is fed to the + side input of the operational amplifiers 15 and 16. Accordingly, no alternating signal is flowed to the transistors 9, 10, causing very high impedance in AC manner between the terminals 1, 3 and 2, 4.
JP6025878A 1978-05-19 1978-05-19 Supply circuit for communication current Pending JPS54151307A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP6025878A JPS54151307A (en) 1978-05-19 1978-05-19 Supply circuit for communication current

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP6025878A JPS54151307A (en) 1978-05-19 1978-05-19 Supply circuit for communication current

Publications (1)

Publication Number Publication Date
JPS54151307A true JPS54151307A (en) 1979-11-28

Family

ID=13136955

Family Applications (1)

Application Number Title Priority Date Filing Date
JP6025878A Pending JPS54151307A (en) 1978-05-19 1978-05-19 Supply circuit for communication current

Country Status (1)

Country Link
JP (1) JPS54151307A (en)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5725766A (en) * 1980-07-23 1982-02-10 Fujitsu Ltd Electronic feeding circuit
JPS58151168A (en) * 1982-03-04 1983-09-08 Fujitsu Ltd Floating feeding type subscriber circuit system
EP0295680A2 (en) * 1987-06-17 1988-12-21 Fujitsu Limited Battery feed circuit
US4982422A (en) * 1988-09-19 1991-01-01 Fujitsu Limited Terminating circuit in a battery feed circuit of an electronic exchange system

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5186908A (en) * 1974-12-23 1976-07-30 Ibm TSUSHINSHISUTEMUNOKANYUSHAKAIRONO KYUDENDENRYOKUSHOHINOGENSHOHOSHIKI
JPS5260510A (en) * 1975-11-10 1977-05-19 Post Office Current supplying circuit of transmission bridge for telephone switching system

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5186908A (en) * 1974-12-23 1976-07-30 Ibm TSUSHINSHISUTEMUNOKANYUSHAKAIRONO KYUDENDENRYOKUSHOHINOGENSHOHOSHIKI
JPS5260510A (en) * 1975-11-10 1977-05-19 Post Office Current supplying circuit of transmission bridge for telephone switching system

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5725766A (en) * 1980-07-23 1982-02-10 Fujitsu Ltd Electronic feeding circuit
JPS6230544B2 (en) * 1980-07-23 1987-07-02 Fujitsu Ltd
JPS58151168A (en) * 1982-03-04 1983-09-08 Fujitsu Ltd Floating feeding type subscriber circuit system
EP0295680A2 (en) * 1987-06-17 1988-12-21 Fujitsu Limited Battery feed circuit
US4982422A (en) * 1988-09-19 1991-01-01 Fujitsu Limited Terminating circuit in a battery feed circuit of an electronic exchange system

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