JPS547213A - Howler signal transmission system - Google Patents

Howler signal transmission system

Info

Publication number
JPS547213A
JPS547213A JP7206677A JP7206677A JPS547213A JP S547213 A JPS547213 A JP S547213A JP 7206677 A JP7206677 A JP 7206677A JP 7206677 A JP7206677 A JP 7206677A JP S547213 A JPS547213 A JP S547213A
Authority
JP
Japan
Prior art keywords
signal transmission
transmission system
howler signal
howler
grade
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
JP7206677A
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 JP7206677A priority Critical patent/JPS547213A/en
Publication of JPS547213A publication Critical patent/JPS547213A/en
Pending legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04M—TELEPHONIC COMMUNICATION
    • H04M3/00—Automatic or semi-automatic exchanges
    • H04M3/02—Calling substations, e.g. by ringing

Landscapes

  • Engineering & Computer Science (AREA)
  • Signal Processing (AREA)
  • Monitoring And Testing Of Exchanges (AREA)
  • Devices For Supply Of Signal Current (AREA)

Abstract

PURPOSE:To prevent the transmission of the higher grade howler signal from the start to plural subscribers by transmitting the lower grade howler signal at the outset.
JP7206677A 1977-06-20 1977-06-20 Howler signal transmission system Pending JPS547213A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP7206677A JPS547213A (en) 1977-06-20 1977-06-20 Howler signal transmission system

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP7206677A JPS547213A (en) 1977-06-20 1977-06-20 Howler signal transmission system

Publications (1)

Publication Number Publication Date
JPS547213A true JPS547213A (en) 1979-01-19

Family

ID=13478642

Family Applications (1)

Application Number Title Priority Date Filing Date
JP7206677A Pending JPS547213A (en) 1977-06-20 1977-06-20 Howler signal transmission system

Country Status (1)

Country Link
JP (1) JPS547213A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS61281665A (en) * 1985-05-30 1986-12-12 Fujitsu Ltd In-band howler transmission method

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS61281665A (en) * 1985-05-30 1986-12-12 Fujitsu Ltd In-band howler transmission method

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