JPS56147546A - Informing device for incoming telephone call - Google Patents

Informing device for incoming telephone call

Info

Publication number
JPS56147546A
JPS56147546A JP5214280A JP5214280A JPS56147546A JP S56147546 A JPS56147546 A JP S56147546A JP 5214280 A JP5214280 A JP 5214280A JP 5214280 A JP5214280 A JP 5214280A JP S56147546 A JPS56147546 A JP S56147546A
Authority
JP
Japan
Prior art keywords
informing
section
incoming call
incoming
alarmed
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.)
Granted
Application number
JP5214280A
Other languages
Japanese (ja)
Other versions
JPS6041906B2 (en
Inventor
Tetsuya Kamimura
Hidemitsu Iwaya
Akira Suzuki
Tsukasa Kato
Takashi Hayashi
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.)
Panasonic Holdings Corp
Original Assignee
Matsushita Electric Industrial 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 Matsushita Electric Industrial Co Ltd filed Critical Matsushita Electric Industrial Co Ltd
Priority to JP5214280A priority Critical patent/JPS6041906B2/en
Publication of JPS56147546A publication Critical patent/JPS56147546A/en
Publication of JPS6041906B2 publication Critical patent/JPS6041906B2/en
Expired 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
    • H04M19/04—Current supply arrangements for telephone systems providing ringing current or supervisory tones, e.g. dialling tone or busy tone the ringing-current being generated at the substations

Landscapes

  • Engineering & Computer Science (AREA)
  • Signal Processing (AREA)

Abstract

PURPOSE:To inform the incoming call surely, by detecting a failure produced at a part of the informing signal generating circuit and switching it to the incoming call information by the auxiliary incoming call informing section. CONSTITUTION:Assuming that the AC power supply 13, power supply 5 and wave shape section 17 are all in normal operation, and only the amplifier 12 in the informing signal generating circuit 2 is in failure. The normal incoming signal informing section 3 consisting of speakers is not alarmed. In this case, no input via the wave shape section 18 is present at the input terminal of the AND gate 16, thus the transistor 19 is off, the drive of the relay 20 is stopped, and the normally closed contact 20b is kept closed and the auxiliary incoming signal informing section 4 is alarmed in place of the normal use incoming call informing section 3.
JP5214280A 1980-04-18 1980-04-18 Telephone call notification device Expired JPS6041906B2 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP5214280A JPS6041906B2 (en) 1980-04-18 1980-04-18 Telephone call notification device

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP5214280A JPS6041906B2 (en) 1980-04-18 1980-04-18 Telephone call notification device

Publications (2)

Publication Number Publication Date
JPS56147546A true JPS56147546A (en) 1981-11-16
JPS6041906B2 JPS6041906B2 (en) 1985-09-19

Family

ID=12906615

Family Applications (1)

Application Number Title Priority Date Filing Date
JP5214280A Expired JPS6041906B2 (en) 1980-04-18 1980-04-18 Telephone call notification device

Country Status (1)

Country Link
JP (1) JPS6041906B2 (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH01216655A (en) * 1988-02-24 1989-08-30 Matsushita Electric Works Ltd Incoming tone ringer

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH01216655A (en) * 1988-02-24 1989-08-30 Matsushita Electric Works Ltd Incoming tone ringer

Also Published As

Publication number Publication date
JPS6041906B2 (en) 1985-09-19

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