JPS55125763A - Automatic howler tone transmission system - Google Patents

Automatic howler tone transmission system

Info

Publication number
JPS55125763A
JPS55125763A JP3449579A JP3449579A JPS55125763A JP S55125763 A JPS55125763 A JP S55125763A JP 3449579 A JP3449579 A JP 3449579A JP 3449579 A JP3449579 A JP 3449579A JP S55125763 A JPS55125763 A JP S55125763A
Authority
JP
Japan
Prior art keywords
telephone set
extension
howler
tone
handset
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
JP3449579A
Other languages
Japanese (ja)
Inventor
Hideji Takagi
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 JP3449579A priority Critical patent/JPS55125763A/en
Publication of JPS55125763A publication Critical patent/JPS55125763A/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

Landscapes

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

Abstract

PURPOSE:To enable the alarm of handset-out for extension telephone set, by transmitting the howler tone to the extension line connecting howler trunk tone periodically to the extension in lockout state. CONSTITUTION:When the central control unit CC detects the extension telophone set A in handset-out after a given time, the connection between the telephone set A and busy tone trunk BTT is disconnected via the peripheral control unit SPC, and howler tone is transmitted to the telephone set A by connecting the telephone set A and howler tone trunk HWT to alarm the handset-out to the extension telephone set A in lockout state.
JP3449579A 1979-03-23 1979-03-23 Automatic howler tone transmission system Pending JPS55125763A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP3449579A JPS55125763A (en) 1979-03-23 1979-03-23 Automatic howler tone transmission system

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP3449579A JPS55125763A (en) 1979-03-23 1979-03-23 Automatic howler tone transmission system

Publications (1)

Publication Number Publication Date
JPS55125763A true JPS55125763A (en) 1980-09-27

Family

ID=12415822

Family Applications (1)

Application Number Title Priority Date Filing Date
JP3449579A Pending JPS55125763A (en) 1979-03-23 1979-03-23 Automatic howler tone transmission system

Country Status (1)

Country Link
JP (1) JPS55125763A (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS57133757A (en) * 1981-02-12 1982-08-18 Iwatsu Electric Co Ltd Howler tone transmission system in time division electronic exchanger
JPS57210765A (en) * 1981-06-19 1982-12-24 Nec Corp Telephone exchanger

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS57133757A (en) * 1981-02-12 1982-08-18 Iwatsu Electric Co Ltd Howler tone transmission system in time division electronic exchanger
JPS6259948B2 (en) * 1981-02-12 1987-12-14 Iwasaki Tsushinki Kk
JPS57210765A (en) * 1981-06-19 1982-12-24 Nec Corp Telephone exchanger

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