JPS57201350A - Information transmission system - Google Patents
Information transmission systemInfo
- Publication number
- JPS57201350A JPS57201350A JP56087273A JP8727381A JPS57201350A JP S57201350 A JPS57201350 A JP S57201350A JP 56087273 A JP56087273 A JP 56087273A JP 8727381 A JP8727381 A JP 8727381A JP S57201350 A JPS57201350 A JP S57201350A
- Authority
- JP
- Japan
- Prior art keywords
- service interruption
- scanner
- slave station
- receiving device
- signal receiving
- 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
Links
Classifications
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B17/00—Monitoring; Testing
- H04B17/20—Monitoring; Testing of receivers
- H04B17/23—Indication means, e.g. displays, alarms, audible means
Landscapes
- Physics & Mathematics (AREA)
- Electromagnetism (AREA)
- Engineering & Computer Science (AREA)
- Computer Networks & Wireless Communication (AREA)
- Signal Processing (AREA)
- Time-Division Multiplex Systems (AREA)
- Data Exchanges In Wide-Area Networks (AREA)
- Small-Scale Networks (AREA)
- Monitoring And Testing Of Transmission In General (AREA)
Abstract
PURPOSE:To discern service interruption of a slave station in a master station by adding circuits for using a service interruption detection signal receiving device of master station side in common with all slave stations. CONSTITUTION:A scanner 9 is working slways in a master station, and input circuits of a service interruption detection signal receiving device 10 are connected cyclically as No. 1 slave station A No. 2 slave station B No. 1 slave station A.... For instance, if service interruption occurs in the No. 1 slave station, voice frequency of (f2-1) band comes to the scanner 9 for a specified time. When an input circuit of the service interruption signal receiving device 10 is formed by the scanner 9, (f2-1) is received and a slave station number signal from the scanner 9 is added and stored. An alarm is indicated at the same time. When service interruption is restored, a data transmitting device (1-1) operates and a demodulator (5-1) detects (f1-1). This signal is taken into the scanner 9 and memory of service interruption detection in the service interruption signal receiving device is erased.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP56087273A JPS57201350A (en) | 1981-06-03 | 1981-06-03 | Information transmission system |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP56087273A JPS57201350A (en) | 1981-06-03 | 1981-06-03 | Information transmission system |
Publications (1)
Publication Number | Publication Date |
---|---|
JPS57201350A true JPS57201350A (en) | 1982-12-09 |
Family
ID=13910153
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP56087273A Pending JPS57201350A (en) | 1981-06-03 | 1981-06-03 | Information transmission system |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPS57201350A (en) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS60224349A (en) * | 1984-04-23 | 1985-11-08 | Oki Electric Ind Co Ltd | Detection for power failure |
-
1981
- 1981-06-03 JP JP56087273A patent/JPS57201350A/en active Pending
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS60224349A (en) * | 1984-04-23 | 1985-11-08 | Oki Electric Ind Co Ltd | Detection for power failure |
JPH0542878B2 (en) * | 1984-04-23 | 1993-06-29 | Oki Electric Ind Co Ltd |
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