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JPS5787269A - Telephone set circuit - Google Patents

Telephone set circuit

Info

Publication number
JPS5787269A
JPS5787269A JP55161899A JP16189980A JPS5787269A JP S5787269 A JPS5787269 A JP S5787269A JP 55161899 A JP55161899 A JP 55161899A JP 16189980 A JP16189980 A JP 16189980A JP S5787269 A JPS5787269 A JP S5787269A
Authority
JP
Japan
Prior art keywords
trunk line
telephone set
call
transmitter
voice
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
JP55161899A
Other languages
Japanese (ja)
Inventor
Shigeyuki Mizukoshi
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
Iwasaki Tsushinki KK
Original Assignee
Iwatsu Electric Co Ltd
Iwasaki Tsushinki KK
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, Iwasaki Tsushinki KK filed Critical Iwatsu Electric Co Ltd
Priority to JP55161899A priority Critical patent/JPS5787269A/en
Publication of JPS5787269A publication Critical patent/JPS5787269A/en
Pending legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04M—TELEPHONIC COMMUNICATION
    • H04M1/00—Substation equipment, e.g. for use by subscribers
    • H04M1/71—Substation extension arrangements

Landscapes

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

Abstract

PURPOSE:To change the connection of a talking circuit to an extension side from a trunk line by means of a simple circuit configuration, by depressing a push-button switch, holding against the trunk line, and also calling other telephone set by a voice, in a state that a hook-switch has been connected to the trunk line. CONSTITUTION:In the course of call to a trunk line, in case when its call is transferred to other telephone set by an extention, the side (a) of each contact S1-S3 is made to contact by depressing a push-button switch S, holding to the trunk line is executed by connecting a resistance R1 between trunk lines l1, l2, and simultaneously, a direct current is made to flow to a transmitter T from a DC power source VB. Also, DC voltage is applied to an amplifier A from the power source VB, and it is made an operating state. Accordingly, when a call voice is sounded toward the transmitter, a voice output from the transmitter T is sent out to other telephone set. In this way, in other telephone set, a loudspeaker SP sounds, and a transmitter and receiver is taken up by this call signal, call to the trunk line is executed.
JP55161899A 1980-11-19 1980-11-19 Telephone set circuit Pending JPS5787269A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP55161899A JPS5787269A (en) 1980-11-19 1980-11-19 Telephone set circuit

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP55161899A JPS5787269A (en) 1980-11-19 1980-11-19 Telephone set circuit

Publications (1)

Publication Number Publication Date
JPS5787269A true JPS5787269A (en) 1982-05-31

Family

ID=15744124

Family Applications (1)

Application Number Title Priority Date Filing Date
JP55161899A Pending JPS5787269A (en) 1980-11-19 1980-11-19 Telephone set circuit

Country Status (1)

Country Link
JP (1) JPS5787269A (en)

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5193803A (en) * 1975-02-17 1976-08-17

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5193803A (en) * 1975-02-17 1976-08-17

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