JPS6484935A - System for selecting line - Google Patents
System for selecting lineInfo
- Publication number
- JPS6484935A JPS6484935A JP62242206A JP24220687A JPS6484935A JP S6484935 A JPS6484935 A JP S6484935A JP 62242206 A JP62242206 A JP 62242206A JP 24220687 A JP24220687 A JP 24220687A JP S6484935 A JPS6484935 A JP S6484935A
- Authority
- JP
- Japan
- Prior art keywords
- monitoring
- selecting
- line
- inputted
- line1
- 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
- Maintenance And Management Of Digital Transmission (AREA)
- Detection And Prevention Of Errors In Transmission (AREA)
- Time-Division Multiplex Systems (AREA)
Abstract
PURPOSE:To automatically selecting-fix a normal line by always monitoring the output of a line selecting part and executing a control so as to select the normal line based on the monitoring result. CONSTITUTION:When a line LINE1 is selected by a line selecting part 3 and connected to a demodulating part 1 and a monitoring part 4, and when the condition of the LINE1 is made abnormal and a receiving signal cannot be detected by the monitoring part 4, pulse signals are intermittently sent from the monitoring part 4, and inputted to a time delaying part 5. A signal in which clock pulses are successive by 5 bits is inputted from the delaying part 5 to an AND gate 7, and a logic product with the clock pulse from an oscillating part 6 is obtained. The output signal of the gate 7 is inputted to a counter part 8, and when the counted value of the clock pulse is >=4 bits, a control signal is outputted from the counter part 8 to the selecting part 3. An LINE2 is selected by the selecting part 3, and connected to the demodulating part 1 and the monitoring part 4. When the LINE2 is abnormal and when the LINEn is abnormal, an LINE3 and the LINE1 are selected in the same way, respectively.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP62242206A JPS6484935A (en) | 1987-09-25 | 1987-09-25 | System for selecting line |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP62242206A JPS6484935A (en) | 1987-09-25 | 1987-09-25 | System for selecting line |
Publications (1)
Publication Number | Publication Date |
---|---|
JPS6484935A true JPS6484935A (en) | 1989-03-30 |
Family
ID=17085831
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP62242206A Pending JPS6484935A (en) | 1987-09-25 | 1987-09-25 | System for selecting line |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPS6484935A (en) |
-
1987
- 1987-09-25 JP JP62242206A patent/JPS6484935A/en active Pending
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