JPS5578663A - Remote control system for public telephone set - Google Patents
Remote control system for public telephone setInfo
- Publication number
- JPS5578663A JPS5578663A JP15099078A JP15099078A JPS5578663A JP S5578663 A JPS5578663 A JP S5578663A JP 15099078 A JP15099078 A JP 15099078A JP 15099078 A JP15099078 A JP 15099078A JP S5578663 A JPS5578663 A JP S5578663A
- Authority
- JP
- Japan
- Prior art keywords
- relay
- loop circuit
- operates
- public telephone
- telephone set
- 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
- 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)
- Monitoring And Testing Of Exchanges (AREA)
- Meter Arrangements (AREA)
- Prepayment Telephone Systems (AREA)
Abstract
PURPOSE:To give the alarm for the faulty state immediately by setting the resistance of the loop circuit in order to secure the non-operating value of the relay in the monitor device which operates via the loop circuit when the public telephone set has the originating and calling. CONSTITUTION:Relay C of public telephone TEL operates when the storage amount of the coins exceeds a fixed threshold level. Resistance R sets the current value of the loop circuit to the non-operating value of relay A, and also sets constant voltage element ZD within the saturation region. Relay SUP monitors the loop circuit, and element ZD moves to the non-saturation region in case the coin storage amount has no margin or the loop circuit is cut off. As a result, relay SUP operates and then alarm control circuit ALMC operates to inform the fault occurrence.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP15099078A JPS5923662B2 (en) | 1978-12-08 | 1978-12-08 | Remote monitoring method for public telephones |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP15099078A JPS5923662B2 (en) | 1978-12-08 | 1978-12-08 | Remote monitoring method for public telephones |
Publications (2)
Publication Number | Publication Date |
---|---|
JPS5578663A true JPS5578663A (en) | 1980-06-13 |
JPS5923662B2 JPS5923662B2 (en) | 1984-06-04 |
Family
ID=15508865
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP15099078A Expired JPS5923662B2 (en) | 1978-12-08 | 1978-12-08 | Remote monitoring method for public telephones |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPS5923662B2 (en) |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS57143969A (en) * | 1981-02-28 | 1982-09-06 | Anritsu Corp | Monitoring method for fault of public telephone and fault signal sending circuit and fault signal monitoring circuit |
JPS63227246A (en) * | 1987-03-17 | 1988-09-21 | Nec Corp | Telephone exchange system with function for displaying collection state of public telephone charges |
-
1978
- 1978-12-08 JP JP15099078A patent/JPS5923662B2/en not_active Expired
Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS57143969A (en) * | 1981-02-28 | 1982-09-06 | Anritsu Corp | Monitoring method for fault of public telephone and fault signal sending circuit and fault signal monitoring circuit |
JPH0157861B2 (en) * | 1981-02-28 | 1989-12-07 | Anritsu Corp | |
JPS63227246A (en) * | 1987-03-17 | 1988-09-21 | Nec Corp | Telephone exchange system with function for displaying collection state of public telephone charges |
Also Published As
Publication number | Publication date |
---|---|
JPS5923662B2 (en) | 1984-06-04 |
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