JPS55121789A - Office incoming tone stopping system for key telephone system - Google Patents

Office incoming tone stopping system for key telephone system

Info

Publication number
JPS55121789A
JPS55121789A JP2840579A JP2840579A JPS55121789A JP S55121789 A JPS55121789 A JP S55121789A JP 2840579 A JP2840579 A JP 2840579A JP 2840579 A JP2840579 A JP 2840579A JP S55121789 A JPS55121789 A JP S55121789A
Authority
JP
Japan
Prior art keywords
extension
tone
office
transformer
speaker
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
JP2840579A
Other languages
Japanese (ja)
Other versions
JPS5925435B2 (en
Inventor
Yutaka Itagaki
Juichi Takano
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.)
Iwatsu Electric Co Ltd
Original Assignee
Iwatsu 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 Iwatsu Electric Co Ltd filed Critical Iwatsu Electric Co Ltd
Priority to JP2840579A priority Critical patent/JPS5925435B2/en
Publication of JPS55121789A publication Critical patent/JPS55121789A/en
Publication of JPS5925435B2 publication Critical patent/JPS5925435B2/en
Expired legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04M—TELEPHONIC COMMUNICATION
    • H04M9/00—Arrangements for interconnection not involving centralised switching
    • H04M9/002—Arrangements for interconnection not involving centralised switching with subscriber controlled access to a line, i.e. key telephone systems
    • H04M9/005—Arrangements for interconnection not involving centralised switching with subscriber controlled access to a line, i.e. key telephone systems with subscriber controlled access to an exchange line

Landscapes

  • Engineering & Computer Science (AREA)
  • Signal Processing (AREA)
  • Sub-Exchange Stations And Push- Button Telephones (AREA)

Abstract

PURPOSE:To realize the 4-wire key telephone system with which the extension tone is heard and only the office incoming tone is stopped, by adding the circuit which produces the extension ringing tone at the extension calling time regardless of the mode of the office incoming tone stopping switch. CONSTITUTION:The incoming signal arrived from the office exchange flows in the route of office incoming tone sending circuit 12 contact 11-1 amplifier 13 transformer 14, and thus the sound is generated through speaker 19 connected to transformer 18 through control line 6. When switch 20 is switched toward resistance 21, the office incoming tone generated through speaker 19 is stopped. In case the extension call is given under these conditions, the extension call flows in the route of extension ringing tone signal sending circuit 23 contact 11-1 amplifier 13 transformer 14. And contact 11-2 is open, and thus transistor 22 is not turned on regardless of the mode of switch 20. As a result, no short-circuit is caused at the primary side of transformer 18, and extension ringing tone is generated through speaker 19.
JP2840579A 1979-03-12 1979-03-12 Method for stopping central office line ringtones in button telephone equipment Expired JPS5925435B2 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP2840579A JPS5925435B2 (en) 1979-03-12 1979-03-12 Method for stopping central office line ringtones in button telephone equipment

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP2840579A JPS5925435B2 (en) 1979-03-12 1979-03-12 Method for stopping central office line ringtones in button telephone equipment

Publications (2)

Publication Number Publication Date
JPS55121789A true JPS55121789A (en) 1980-09-19
JPS5925435B2 JPS5925435B2 (en) 1984-06-18

Family

ID=12247746

Family Applications (1)

Application Number Title Priority Date Filing Date
JP2840579A Expired JPS5925435B2 (en) 1979-03-12 1979-03-12 Method for stopping central office line ringtones in button telephone equipment

Country Status (1)

Country Link
JP (1) JPS5925435B2 (en)

Also Published As

Publication number Publication date
JPS5925435B2 (en) 1984-06-18

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