JPS57142043A - Optical multiplexing signal transmission system - Google Patents
Optical multiplexing signal transmission systemInfo
- Publication number
- JPS57142043A JPS57142043A JP56027048A JP2704881A JPS57142043A JP S57142043 A JPS57142043 A JP S57142043A JP 56027048 A JP56027048 A JP 56027048A JP 2704881 A JP2704881 A JP 2704881A JP S57142043 A JPS57142043 A JP S57142043A
- Authority
- JP
- Japan
- Prior art keywords
- light emitting
- emitting element
- output
- lambda2
- photodetector
- 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
- H04B10/00—Transmission systems employing electromagnetic waves other than radio-waves, e.g. infrared, visible or ultraviolet light, or employing corpuscular radiation, e.g. quantum communication
- H04B10/07—Arrangements for monitoring or testing transmission systems; Arrangements for fault measurement of transmission systems
Landscapes
- Physics & Mathematics (AREA)
- Electromagnetism (AREA)
- Engineering & Computer Science (AREA)
- Computer Networks & Wireless Communication (AREA)
- Signal Processing (AREA)
- Monitoring And Testing Of Transmission In General (AREA)
- Optical Communication System (AREA)
Abstract
PURPOSE:To save man-power for maintenance and inspection and to make the system highly reliable, by monitoring a failure in a light emitting element at a field of a plant at a central control room. CONSTITUTION:A controller 11 of a central control room and a terminal device 21 of a field of a plant are connected with optical fibers 41a and 41b. At the transmission from the device 21 to the device 11, an output light of a light emitting element 51 is received at a photodetector 54a through a coupler 43a, and the output of photodetection is monitored at a switching circuit 71. If the element 51 is in failure, the switching circuit 71 drives a light emitting element 52 in an oscillated wave length lambda2. The optical signal in the wave length lambda2 is transmitted to the device 11, and outputted at a fiber 41k at a brancher 44 and received at a photodetector 54c. This detection signal is given to a controller 12, the switching of a reproduced output is detected at a diagnosis display circuit 72, and a terminal device number is displayed.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP56027048A JPS57142043A (en) | 1981-02-27 | 1981-02-27 | Optical multiplexing signal transmission system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP56027048A JPS57142043A (en) | 1981-02-27 | 1981-02-27 | Optical multiplexing signal transmission system |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPS57142043A true JPS57142043A (en) | 1982-09-02 |
Family
ID=12210181
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP56027048A Pending JPS57142043A (en) | 1981-02-27 | 1981-02-27 | Optical multiplexing signal transmission system |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS57142043A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS59153141A (en) * | 1983-02-21 | 1984-09-01 | Kokusai Denshin Denwa Co Ltd <Kdd> | Monitoring system for photo repeater |
| JPH04157929A (en) * | 1990-10-22 | 1992-05-29 | Nec Corp | System for interconnecting equipments |
-
1981
- 1981-02-27 JP JP56027048A patent/JPS57142043A/en active Pending
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS59153141A (en) * | 1983-02-21 | 1984-09-01 | Kokusai Denshin Denwa Co Ltd <Kdd> | Monitoring system for photo repeater |
| JPH04157929A (en) * | 1990-10-22 | 1992-05-29 | Nec Corp | System for interconnecting equipments |
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