JPS5437513A - Double calling signal system of important circuit cuit - Google Patents

Double calling signal system of important circuit cuit

Info

Publication number
JPS5437513A
JPS5437513A JP10461977A JP10461977A JPS5437513A JP S5437513 A JPS5437513 A JP S5437513A JP 10461977 A JP10461977 A JP 10461977A JP 10461977 A JP10461977 A JP 10461977A JP S5437513 A JPS5437513 A JP S5437513A
Authority
JP
Japan
Prior art keywords
signal system
calling signal
important circuit
cuit
double
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
JP10461977A
Other languages
Japanese (ja)
Other versions
JPS6032376B2 (en
Inventor
Osamu Igarashi
Shigeru Tominaga
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 JP10461977A priority Critical patent/JPS6032376B2/en
Publication of JPS5437513A publication Critical patent/JPS5437513A/en
Publication of JPS6032376B2 publication Critical patent/JPS6032376B2/en
Expired legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04M—TELEPHONIC COMMUNICATION
    • H04M3/00—Automatic or semi-automatic exchanges
    • H04M3/42—Systems providing special services or facilities to subscribers

Landscapes

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

Abstract

PURPOSE:To make it possible to inform a terminal of an urgent message definitely by enabling the head office to function to control commands and the terminal to amplify a speech.
JP10461977A 1977-08-30 1977-08-30 Dual ring signaling system for important lines Expired JPS6032376B2 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP10461977A JPS6032376B2 (en) 1977-08-30 1977-08-30 Dual ring signaling system for important lines

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP10461977A JPS6032376B2 (en) 1977-08-30 1977-08-30 Dual ring signaling system for important lines

Publications (2)

Publication Number Publication Date
JPS5437513A true JPS5437513A (en) 1979-03-20
JPS6032376B2 JPS6032376B2 (en) 1985-07-27

Family

ID=14385446

Family Applications (1)

Application Number Title Priority Date Filing Date
JP10461977A Expired JPS6032376B2 (en) 1977-08-30 1977-08-30 Dual ring signaling system for important lines

Country Status (1)

Country Link
JP (1) JPS6032376B2 (en)

Also Published As

Publication number Publication date
JPS6032376B2 (en) 1985-07-27

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