JPS57107671A - Public telephone set for consignment - Google Patents
Public telephone set for consignmentInfo
- 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
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.
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) |
-
1980
- 1980-12-25 JP JP18446180A patent/JPS57107671A/en active Granted
Also Published As
Publication number | Publication date |
---|---|
JPS6335147B2 (en) | 1988-07-13 |
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