JPS51150207A - Current supplying method for telephone - Google Patents

Current supplying method for telephone

Info

Publication number
JPS51150207A
JPS51150207A JP7321275A JP7321275A JPS51150207A JP S51150207 A JPS51150207 A JP S51150207A JP 7321275 A JP7321275 A JP 7321275A JP 7321275 A JP7321275 A JP 7321275A JP S51150207 A JPS51150207 A JP S51150207A
Authority
JP
Japan
Prior art keywords
telephone
current
current supplying
supplying method
wire system
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
JP7321275A
Other languages
Japanese (ja)
Inventor
Kozo Kamata
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.)
Hitachi Ltd
Original Assignee
Hitachi 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 Hitachi Ltd filed Critical Hitachi Ltd
Priority to JP7321275A priority Critical patent/JPS51150207A/en
Priority to US05/695,760 priority patent/US4150260A/en
Priority to GB24968/76A priority patent/GB1554421A/en
Priority to DE2627140A priority patent/DE2627140C3/en
Priority to CA255,082A priority patent/CA1057437A/en
Priority to NLAANVRAGE7606570,A priority patent/NL178117C/en
Publication of JPS51150207A publication Critical patent/JPS51150207A/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
    • H04M19/02—Current supply arrangements for telephone systems providing ringing current or supervisory tones, e.g. dialling tone or busy tone
    • H04M19/023—Current supply arrangements for telephone systems providing ringing current or supervisory tones, e.g. dialling tone or busy tone by reversing the polarity of the current at the exchange

Landscapes

  • Engineering & Computer Science (AREA)
  • Signal Processing (AREA)
  • Interface Circuits In Exchanges (AREA)

Abstract

PURPOSE:To supply telephone current to a two-wire system telephone set connected to a four-wire system telephone station with an economical operation, a small-sized device and a improved transmission characteristic, by superposing the telephone supply current on voice current.
JP7321275A 1975-06-18 1975-06-18 Current supplying method for telephone Pending JPS51150207A (en)

Priority Applications (6)

Application Number Priority Date Filing Date Title
JP7321275A JPS51150207A (en) 1975-06-18 1975-06-18 Current supplying method for telephone
US05/695,760 US4150260A (en) 1975-06-18 1976-06-14 Subscriber's circuit for four-wire-system local switch
GB24968/76A GB1554421A (en) 1975-06-18 1976-06-16 Subscriber's circuit for four-wire-system local switch
DE2627140A DE2627140C3 (en) 1975-06-18 1976-06-16 Hybrid circuit in subscriber circuit
CA255,082A CA1057437A (en) 1975-06-18 1976-06-17 Subscriber's circuit for four-wire-system local switch
NLAANVRAGE7606570,A NL178117C (en) 1975-06-18 1976-06-17 COUPLING DEVICE FOR FORMING A COUPLING BETWEEN A FOUR-WAY PATH OF A TIME MULTIPLEX SWITCH NETWORK AND A TWO-WIRE SUBSCRIBER LINE.

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP7321275A JPS51150207A (en) 1975-06-18 1975-06-18 Current supplying method for telephone

Publications (1)

Publication Number Publication Date
JPS51150207A true JPS51150207A (en) 1976-12-23

Family

ID=13511614

Family Applications (1)

Application Number Title Priority Date Filing Date
JP7321275A Pending JPS51150207A (en) 1975-06-18 1975-06-18 Current supplying method for telephone

Country Status (1)

Country Link
JP (1) JPS51150207A (en)

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3700831A (en) * 1970-01-13 1972-10-24 Philips Corp Hybrid circuit

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3700831A (en) * 1970-01-13 1972-10-24 Philips Corp Hybrid circuit

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