JPS5792962A - Interface circuit - Google Patents
Interface circuitInfo
- Publication number
- JPS5792962A JPS5792962A JP16750780A JP16750780A JPS5792962A JP S5792962 A JPS5792962 A JP S5792962A JP 16750780 A JP16750780 A JP 16750780A JP 16750780 A JP16750780 A JP 16750780A JP S5792962 A JPS5792962 A JP S5792962A
- Authority
- JP
- Japan
- Prior art keywords
- switch
- earth
- diodes
- lines
- interface circuit
- 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
- H04Q—SELECTING
- H04Q3/00—Selecting arrangements
- H04Q3/42—Circuit arrangements for indirect selecting controlled by common circuits, e.g. register controller, marker
- H04Q3/52—Circuit arrangements for indirect selecting controlled by common circuits, e.g. register controller, marker using static devices in switching stages, e.g. electronic switching arrangements
- H04Q3/521—Circuit arrangements for indirect selecting controlled by common circuits, e.g. register controller, marker using static devices in switching stages, e.g. electronic switching arrangements using semiconductors in the switching stages
Landscapes
- Engineering & Computer Science (AREA)
- Computer Networks & Wireless Communication (AREA)
- Interface Circuits In Exchanges (AREA)
Abstract
PURPOSE:To cope with a power break, by connecting the output terminal of an electronic relay to the earth through a diode at the power break time. CONSTITUTION:Electronic relays 71-724 consisting of transistors for SR signal transmission and etc. are connected not only to SR lines CH1-CH24 but also to the earth through diodes D1-D24 and a common switch SW. In the normal operation, the switch SW is opened, and diodes D1-D24 are cut off for signals transmitted from respective electronic relays. When the local power source becomes faulty or broken by some cause, the switch SW is closed, and the earth is transmitted to all lines CH1-CH24 through type switch SW and respective diodes.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP16750780A JPS5792962A (en) | 1980-11-28 | 1980-11-28 | Interface circuit |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP16750780A JPS5792962A (en) | 1980-11-28 | 1980-11-28 | Interface circuit |
Publications (2)
Publication Number | Publication Date |
---|---|
JPS5792962A true JPS5792962A (en) | 1982-06-09 |
JPS6325741B2 JPS6325741B2 (en) | 1988-05-26 |
Family
ID=15850956
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP16750780A Granted JPS5792962A (en) | 1980-11-28 | 1980-11-28 | Interface circuit |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPS5792962A (en) |
-
1980
- 1980-11-28 JP JP16750780A patent/JPS5792962A/en active Granted
Also Published As
Publication number | Publication date |
---|---|
JPS6325741B2 (en) | 1988-05-26 |
Similar Documents
Publication | Publication Date | Title |
---|---|---|
JPS5792962A (en) | Interface circuit | |
JPS56104529A (en) | Flip-flop circuit | |
JPS55117371A (en) | Transmission method for analog telephone signal | |
JPS55147863A (en) | Correcting system of dial pulse distortion | |
JPS5792961A (en) | Interface circuit | |
JPS56149851A (en) | Looplike data transmission equipment | |
JPS55145460A (en) | Communication terminal unit and its exchange network | |
JPS6447145A (en) | Multiplex transmission equipment | |
JPS55112059A (en) | Clock extracting circuit | |
JPS5690655A (en) | Wire transmission system | |
JPS6410533A (en) | Troubleshooting device of detecting switch | |
JPS57104354A (en) | Button telephone set | |
JPS6224988Y2 (en) | ||
JPS57113672A (en) | Call control system in facsimile device or the like | |
JPS5513503A (en) | Telephone terminal control system | |
JPS5799030A (en) | Signal switching circuit | |
JPS56158551A (en) | Data transmission controlling system | |
JPS553222A (en) | Signal transmission/reception system | |
JPS5513570A (en) | Automatic raising system of double central control units at trouble time | |
JPS56122541A (en) | Hybrid circuit | |
JPS5660121A (en) | Circuit switching system | |
JPS553221A (en) | Signal transmission/reception system | |
JPS6423175A (en) | Logic circuit testing machine | |
JPS5637766A (en) | Automatic telephone switching device for telemeter | |
JPS5538758A (en) | Using/spare circuit switching system for signal transmission |