JPS5496306A - Public telephone set - Google Patents

Public telephone set

Info

Publication number
JPS5496306A
JPS5496306A JP316678A JP316678A JPS5496306A JP S5496306 A JPS5496306 A JP S5496306A JP 316678 A JP316678 A JP 316678A JP 316678 A JP316678 A JP 316678A JP S5496306 A JPS5496306 A JP S5496306A
Authority
JP
Japan
Prior art keywords
switching means
circuit switching
call
charged
polarity inversion
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
JP316678A
Other languages
Japanese (ja)
Other versions
JPS6226217B2 (en
Inventor
Yoshio Fujishita
Satoshi Iizuka
Takumi Kawashima
Riyouichi Kamashita
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.)
Anritsu Corp
Nippon Telegraph and Telephone Corp
Tamura Electric Works Ltd
Original Assignee
Anritsu Corp
Nippon Telegraph and Telephone Corp
Tamura Electric Works 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 Anritsu Corp, Nippon Telegraph and Telephone Corp, Tamura Electric Works Ltd filed Critical Anritsu Corp
Priority to JP316678A priority Critical patent/JPS5496306A/en
Publication of JPS5496306A publication Critical patent/JPS5496306A/en
Publication of JPS6226217B2 publication Critical patent/JPS6226217B2/ja
Granted legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04M—TELEPHONIC COMMUNICATION
    • H04M17/00—Prepayment of wireline communication systems, wireless communication systems or telephone systems

Landscapes

  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Computer Security & Cryptography (AREA)
  • Signal Processing (AREA)
  • Prepayment Telephone Systems (AREA)

Abstract

PURPOSE:To enable both emergency call and the free line talking as well as to prevent the charged talking caused by operation of the special key during service interruption through a simple constituion in which three pairs of circuit switching means are provided. CONSTITUTION:The public telephone set consists of hook switches HS1-HS3, answer monitor relay X (which is operated by polarity inversion signal and released by returning the handset), button switch B for emergency call, relay Y which operates through operation of B, speech circuit N and others. And the following means are added: 1st circuit switching means CH1 which is actuated by formation of the outgoing conditions while the commercial power source is being supplied (and not actuated during the service interruption); 2nd circuit switching means CH2 which operates by receiving the polarity inversion signal transmitted from the office side when the called party gives an answer in the charged call and is released at the on-hook time; and 3rd circuit switching means CH3 which enables the signal transmission irrespective of the reception or interruption of the commercial power supply. Thus, in case CH1 has no operation when the charged call is given through CH3, the talkig current loop is opened by the action of CH2 to make the call impossible.At the same time, the polarity inversion signal flows through CH2 via CH3 to actuate CH2.
JP316678A 1978-01-14 1978-01-14 Public telephone set Granted JPS5496306A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP316678A JPS5496306A (en) 1978-01-14 1978-01-14 Public telephone set

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP316678A JPS5496306A (en) 1978-01-14 1978-01-14 Public telephone set

Publications (2)

Publication Number Publication Date
JPS5496306A true JPS5496306A (en) 1979-07-30
JPS6226217B2 JPS6226217B2 (en) 1987-06-08

Family

ID=11549769

Family Applications (1)

Application Number Title Priority Date Filing Date
JP316678A Granted JPS5496306A (en) 1978-01-14 1978-01-14 Public telephone set

Country Status (1)

Country Link
JP (1) JPS5496306A (en)

Also Published As

Publication number Publication date
JPS6226217B2 (en) 1987-06-08

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