JPS5684052A - Automatic transmission-line switching system - Google Patents
Automatic transmission-line switching systemInfo
- Publication number
- JPS5684052A JPS5684052A JP16182979A JP16182979A JPS5684052A JP S5684052 A JPS5684052 A JP S5684052A JP 16182979 A JP16182979 A JP 16182979A JP 16182979 A JP16182979 A JP 16182979A JP S5684052 A JPS5684052 A JP S5684052A
- Authority
- JP
- Japan
- Prior art keywords
- error rate
- terminal station
- stand
- transmission line
- receiving terminal
- 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
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L1/00—Arrangements for detecting or preventing errors in the information received
- H04L1/22—Arrangements for detecting or preventing errors in the information received using redundant apparatus to increase reliability
Landscapes
- Engineering & Computer Science (AREA)
- Computer Networks & Wireless Communication (AREA)
- Signal Processing (AREA)
- Detection And Prevention Of Errors In Transmission (AREA)
Abstract
PURPOSE:To prevent switching operation from being repeated when transmission lines are switched by monitoring the error rate of an in-use transmission line, by providing two threshold values of the error rate to be changed over and by changing threshold values of the error rate when it is changed over to a stand-by transmission line. CONSTITUTION:While an in-use transmission line is provided between transmitting terminal station 2a and receiving terminal station 4a, a stand-by transmission line is provided between transmitting terminal station 2b and receiving terminal station 4b and receiving terminal station 4a is provided with a method of measuring error rates of transmission lines. Firstly, the threshold value of the error rate is set to 10<-6> and if the error rate of the stand-by system reaches 10<-6> or more, a switching indication signal is sent to switch control part 6, which applies a switching control signal to switch parts 1 and 5 to change the in-use system over to the stand-by system. This switching control signal is applied to receiving terminal station 4a and the threshold value of the error rate is changed over to 10<-9> to measure the error rate of the monitoring pattern of the in-use system, but even if the error rate changes to about 10<-6>, the switching operation is not performed and when it decreases down to 10<-9> or less, the switching indication signal is sent to control part 6 to changes the stand-by system over to the in-use system.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP16182979A JPS5837743B2 (en) | 1979-12-13 | 1979-12-13 | Automatic transmission line switching method |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP16182979A JPS5837743B2 (en) | 1979-12-13 | 1979-12-13 | Automatic transmission line switching method |
Publications (2)
Publication Number | Publication Date |
---|---|
JPS5684052A true JPS5684052A (en) | 1981-07-09 |
JPS5837743B2 JPS5837743B2 (en) | 1983-08-18 |
Family
ID=15742699
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP16182979A Expired JPS5837743B2 (en) | 1979-12-13 | 1979-12-13 | Automatic transmission line switching method |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPS5837743B2 (en) |
Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS59174042A (en) * | 1983-03-23 | 1984-10-02 | Hitachi Ltd | Detecting circuit for pcm code error factor |
EP0305994A2 (en) * | 1987-08-31 | 1989-03-08 | Fujitsu Limited | Data communication system having means for switching between main and stand-by apparatuses |
JPH05167588A (en) * | 1991-12-13 | 1993-07-02 | Yamatake Honeywell Co Ltd | Abnormality detection system of channel in local area network |
-
1979
- 1979-12-13 JP JP16182979A patent/JPS5837743B2/en not_active Expired
Cited By (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS59174042A (en) * | 1983-03-23 | 1984-10-02 | Hitachi Ltd | Detecting circuit for pcm code error factor |
EP0305994A2 (en) * | 1987-08-31 | 1989-03-08 | Fujitsu Limited | Data communication system having means for switching between main and stand-by apparatuses |
US4831617A (en) * | 1987-08-31 | 1989-05-16 | Fujitsu Limited | Data communication system having means for switching between main and stand-by apparatuses |
JPH05167588A (en) * | 1991-12-13 | 1993-07-02 | Yamatake Honeywell Co Ltd | Abnormality detection system of channel in local area network |
Also Published As
Publication number | Publication date |
---|---|
JPS5837743B2 (en) | 1983-08-18 |
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