JPS57190450A - Privacy system for push-button dial telephone set - Google Patents

Privacy system for push-button dial telephone set

Info

Publication number
JPS57190450A
JPS57190450A JP7534981A JP7534981A JPS57190450A JP S57190450 A JPS57190450 A JP S57190450A JP 7534981 A JP7534981 A JP 7534981A JP 7534981 A JP7534981 A JP 7534981A JP S57190450 A JPS57190450 A JP S57190450A
Authority
JP
Japan
Prior art keywords
privacy
push
dial telephone
circuit
button dial
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
JP7534981A
Other languages
Japanese (ja)
Other versions
JPH0129119B2 (en
Inventor
Seiichi Nakazawa
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.)
Meisei Electric Co Ltd
Original Assignee
Meisei 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 Meisei Electric Co Ltd filed Critical Meisei Electric Co Ltd
Priority to JP7534981A priority Critical patent/JPS57190450A/en
Publication of JPS57190450A publication Critical patent/JPS57190450A/en
Publication of JPH0129119B2 publication Critical patent/JPH0129119B2/ja
Granted 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 produce a push-button dial telephone set with an extension privacy function in addition to a main wire privary function. CONSTITUTION:In addition to a main wire privacy function, an extension privacy function which is impossible in the ordinary privacy system is provided to subscribers of push-button dial telephone sets by connecting a main wire privacy circuit operated by detecting the voltage of a control line for a main wire circuit, a control line voltage detecting circuit for an extension circuit operated by a comparator, an extension calling status storage operated by a thyrister, and a switch circuit for sending control line voltage operated by a transistor to each bush-button dial telephone set.
JP7534981A 1981-05-19 1981-05-19 Privacy system for push-button dial telephone set Granted JPS57190450A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP7534981A JPS57190450A (en) 1981-05-19 1981-05-19 Privacy system for push-button dial telephone set

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP7534981A JPS57190450A (en) 1981-05-19 1981-05-19 Privacy system for push-button dial telephone set

Publications (2)

Publication Number Publication Date
JPS57190450A true JPS57190450A (en) 1982-11-24
JPH0129119B2 JPH0129119B2 (en) 1989-06-07

Family

ID=13573672

Family Applications (1)

Application Number Title Priority Date Filing Date
JP7534981A Granted JPS57190450A (en) 1981-05-19 1981-05-19 Privacy system for push-button dial telephone set

Country Status (1)

Country Link
JP (1) JPS57190450A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS63217758A (en) * 1987-03-05 1988-09-09 Nec Corp Branching telephone set

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS63217758A (en) * 1987-03-05 1988-09-09 Nec Corp Branching telephone set
JPH055421B2 (en) * 1987-03-05 1993-01-22 Nippon Electric Co

Also Published As

Publication number Publication date
JPH0129119B2 (en) 1989-06-07

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