JPS57107671A - Public telephone set for consignment - Google Patents

Public telephone set for consignment

Info

Publication number
JPS57107671A
JPS57107671A JP18446180A JP18446180A JPS57107671A JP S57107671 A JPS57107671 A JP S57107671A JP 18446180 A JP18446180 A JP 18446180A JP 18446180 A JP18446180 A JP 18446180A JP S57107671 A JPS57107671 A JP S57107671A
Authority
JP
Japan
Prior art keywords
consignment
relay
audible alarm
operator
person
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
JP18446180A
Other languages
Japanese (ja)
Other versions
JPS6335147B2 (en
Inventor
Yasuo Kobayashi
Tomonao Kikuchihara
Junji Nakada
Hideaki Teramura
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.)
Nippon Telegraph and Telephone Corp
Tamura Electric Works Ltd
Original Assignee
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 Nippon Telegraph and Telephone Corp, Tamura Electric Works Ltd filed Critical Nippon Telegraph and Telephone Corp
Priority to JP18446180A priority Critical patent/JPS57107671A/en
Publication of JPS57107671A publication Critical patent/JPS57107671A/en
Publication of JPS6335147B2 publication Critical patent/JPS6335147B2/ja
Granted 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
    • H04M1/66—Substation equipment, e.g. for use by subscribers with means for preventing unauthorised or fraudulent calling
    • H04M1/667—Preventing unauthorised calls from a telephone set
    • H04M1/67—Preventing unauthorised calls from a telephone set by electronic means

Landscapes

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

Abstract

PURPOSE:To disable call by a collect-call when a person other than consignment person makes off-hook, by transmitting an audible tone to an operator automatically, when the response operation is made without the consignment person. CONSTITUTION:When a relay RR is operated with off-hook after callout signal incoming, power is applied to a varistor VR with a contact rr<2>. Thus, a signal generator SG producing audible alarm tone is started, and the audible alarm signal transmitted from output terminals c, d of a signal generator SG is applied to an induction coil IND via a capacitor C6 and also to a transmitter T, and transmitte to the operator via line terminals L1 and L2. But, when the consignment person operates a no-charge key, key contacts ks<1>, ks<2> are operated and the operation of a relay M and the relay RR is blocked, and the contact rr<2> is not switched so the transmission of audible alarm signal to the operator is interrupted.
JP18446180A 1980-12-25 1980-12-25 Public telephone set for consignment Granted JPS57107671A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP18446180A JPS57107671A (en) 1980-12-25 1980-12-25 Public telephone set for consignment

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP18446180A JPS57107671A (en) 1980-12-25 1980-12-25 Public telephone set for consignment

Publications (2)

Publication Number Publication Date
JPS57107671A true JPS57107671A (en) 1982-07-05
JPS6335147B2 JPS6335147B2 (en) 1988-07-13

Family

ID=16153551

Family Applications (1)

Application Number Title Priority Date Filing Date
JP18446180A Granted JPS57107671A (en) 1980-12-25 1980-12-25 Public telephone set for consignment

Country Status (1)

Country Link
JP (1) JPS57107671A (en)

Also Published As

Publication number Publication date
JPS6335147B2 (en) 1988-07-13

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