JPS6444656A - Data communication system - Google Patents
Data communication systemInfo
- Publication number
- JPS6444656A JPS6444656A JP62202084A JP20208487A JPS6444656A JP S6444656 A JPS6444656 A JP S6444656A JP 62202084 A JP62202084 A JP 62202084A JP 20208487 A JP20208487 A JP 20208487A JP S6444656 A JPS6444656 A JP S6444656A
- Authority
- JP
- Japan
- Prior art keywords
- data
- terminal equipment
- reception
- side terminal
- signal
- 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
- Detection And Prevention Of Errors In Transmission (AREA)
- Bidirectional Digital Transmission (AREA)
- Communication Control (AREA)
Abstract
PURPOSE:To quickly transmit emergency data which occurs in a reception-side terminal equipment, by transmitting an emergency transmission request signal having a specific frequency from the reception-side terminal equipment at the time of occurrence of emergency data to be transmitted on the way of data reception and stopping data transmission in a data reception-side terminal equipment at the time of detecting this signal. CONSTITUTION:Though a data signal VA' in the low level leaked to the four- wire reception side is outputted during data transmission, outputs of level detectors 14a and 14b go to the low level if the reference level of level detectors 14a and 14b is properly set. If an emergency transmission request signal VB is received, signals of 941Hz and 1336Hz are considerably larger than the leaked data signal VA', and outputs of level detectors 14a and 14b go to the high level and the output of an AND circuit 15 goes to the high level also to output the detection signal of the response signal VB. Then, a data transmission-side terminal equipment A stops data transmission and emergency data VC transmitted from a reception-side terminal equipment B is received by the transmission-side terminal equipment A.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP62202084A JPS6444656A (en) | 1987-08-13 | 1987-08-13 | Data communication system |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP62202084A JPS6444656A (en) | 1987-08-13 | 1987-08-13 | Data communication system |
Publications (1)
Publication Number | Publication Date |
---|---|
JPS6444656A true JPS6444656A (en) | 1989-02-17 |
Family
ID=16451698
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP62202084A Pending JPS6444656A (en) | 1987-08-13 | 1987-08-13 | Data communication system |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPS6444656A (en) |
-
1987
- 1987-08-13 JP JP62202084A patent/JPS6444656A/en active Pending
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