JPS6457838A - Electric signal multiplexing circuit for optical module - Google Patents
Electric signal multiplexing circuit for optical moduleInfo
- Publication number
- JPS6457838A JPS6457838A JP62212854A JP21285487A JPS6457838A JP S6457838 A JPS6457838 A JP S6457838A JP 62212854 A JP62212854 A JP 62212854A JP 21285487 A JP21285487 A JP 21285487A JP S6457838 A JPS6457838 A JP S6457838A
- Authority
- JP
- Japan
- Prior art keywords
- signal
- transmission line
- optical
- counters
- high level
- 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
Landscapes
- Optical Communication System (AREA)
Abstract
PURPOSE:To detect a fault caused in a transmission line by providing a photosensor and an optical fault detecting circuit. CONSTITUTION:The light sensor detecting the arrival of a signal is provided to the reception side of the transmission line and when a signal S19 from the light sensor is '0', outputs S20, S21 at Q from DFF registers 24, 25 of the optical fault detecting circuit go to a high level and counters 30, 31 start counting. When the signal S19 is zero over the count set by the counters 30, 31, outputs S22, S23 are sent from the counters 30, 31 and when both the signals are logical '1', a light detection signal S24 goes to a high level. That is, if no optical signal exists in the optical transmission line, the output of the light detecting circuit goes to a high level. Thus, a fault caused in the transmission line can be detected with simple circuit constitution.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP62212854A JPS6457838A (en) | 1987-08-28 | 1987-08-28 | Electric signal multiplexing circuit for optical module |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP62212854A JPS6457838A (en) | 1987-08-28 | 1987-08-28 | Electric signal multiplexing circuit for optical module |
Publications (1)
Publication Number | Publication Date |
---|---|
JPS6457838A true JPS6457838A (en) | 1989-03-06 |
Family
ID=16629415
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP62212854A Pending JPS6457838A (en) | 1987-08-28 | 1987-08-28 | Electric signal multiplexing circuit for optical module |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPS6457838A (en) |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US5523868A (en) * | 1991-12-19 | 1996-06-04 | Dsc Communications Corporation | Apparatus and method for monitoring power loss in a telecommunications system |
JP2009088314A (en) * | 2007-10-01 | 2009-04-23 | Hitachi Kokusai Electric Inc | Substrate treatment device |
-
1987
- 1987-08-28 JP JP62212854A patent/JPS6457838A/en active Pending
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US5523868A (en) * | 1991-12-19 | 1996-06-04 | Dsc Communications Corporation | Apparatus and method for monitoring power loss in a telecommunications system |
JP2009088314A (en) * | 2007-10-01 | 2009-04-23 | Hitachi Kokusai Electric Inc | Substrate treatment device |
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