JPS5758439A - Data transmission device - Google Patents

Data transmission device

Info

Publication number
JPS5758439A
JPS5758439A JP55133362A JP13336280A JPS5758439A JP S5758439 A JPS5758439 A JP S5758439A JP 55133362 A JP55133362 A JP 55133362A JP 13336280 A JP13336280 A JP 13336280A JP S5758439 A JPS5758439 A JP S5758439A
Authority
JP
Japan
Prior art keywords
section
line
transmission
switching
data 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
Application number
JP55133362A
Other languages
Japanese (ja)
Other versions
JPS636187B2 (en
Inventor
Masahiro Tada
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
NEC Corp
Original Assignee
NEC Corp
Nippon Electric Co Ltd
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by NEC Corp, Nippon Electric Co Ltd filed Critical NEC Corp
Priority to JP55133362A priority Critical patent/JPS5758439A/en
Publication of JPS5758439A publication Critical patent/JPS5758439A/en
Publication of JPS636187B2 publication Critical patent/JPS636187B2/ja
Granted legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L12/00—Data switching networks
    • H04L12/28—Data switching networks characterised by path configuration, e.g. LAN [Local Area Networks] or WAN [Wide Area Networks]
    • H04L12/42—Loop networks
    • H04L12/437—Ring fault isolation or reconfiguration

Landscapes

  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Small-Scale Networks (AREA)
  • Monitoring And Testing Of Transmission In General (AREA)

Abstract

PURPOSE:To increase the usage efficiency of a loop data transmission system, by performing the confirming test for repair at a data terminal section without giving interference to the operation of the loop data transmission system. CONSTITUTION:A data transmitter consists of a transmission/reception section 10 for a transmission line 1, a transmission/reception section 20 for a transmission line 2 and a data terminal 30. A switching control section 303 provided at the data terminal, in response to the state of a clock detecting signal at the both transmission lines, transmits one of a switching signal which connects the section 30 to the line 1 and by-passes the line 2, a switching signal which connects the section 30 to the line 2 and by-passes the line 1, and a switching signal which by-passes the lines 1 and 2 and disconnects the section 30 from the lines, to data terminal switching section 302, switching sections 104, 204, for switching operation.
JP55133362A 1980-09-25 1980-09-25 Data transmission device Granted JPS5758439A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP55133362A JPS5758439A (en) 1980-09-25 1980-09-25 Data transmission device

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP55133362A JPS5758439A (en) 1980-09-25 1980-09-25 Data transmission device

Publications (2)

Publication Number Publication Date
JPS5758439A true JPS5758439A (en) 1982-04-08
JPS636187B2 JPS636187B2 (en) 1988-02-08

Family

ID=15102943

Family Applications (1)

Application Number Title Priority Date Filing Date
JP55133362A Granted JPS5758439A (en) 1980-09-25 1980-09-25 Data transmission device

Country Status (1)

Country Link
JP (1) JPS5758439A (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS60187699A (en) * 1984-03-07 1985-09-25 Teikoku Piston Ring Co Ltd Composite iron plating having superior wear resistance
JPS6328151A (en) * 1986-07-22 1988-02-05 Yamatake Honeywell Co Ltd Switching device for multiple loop transmission system

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS60187699A (en) * 1984-03-07 1985-09-25 Teikoku Piston Ring Co Ltd Composite iron plating having superior wear resistance
JPS6334239B2 (en) * 1984-03-07 1988-07-08 Teikoku Piston Ring Co Ltd
JPS6328151A (en) * 1986-07-22 1988-02-05 Yamatake Honeywell Co Ltd Switching device for multiple loop transmission system

Also Published As

Publication number Publication date
JPS636187B2 (en) 1988-02-08

Similar Documents

Publication Publication Date Title
JPS5758439A (en) Data transmission device
JPS5726947A (en) Remote test system for data communication line
JPS5577258A (en) Abnormality detecting method for data transmission line
JPS54157010A (en) Subscriber congestion detection unit
JPS5372412A (en) Signal transmission system
JPS51126492A (en) Information transmitting method
JPS5399710A (en) Signal transmission circuit
JPS5797753A (en) Loop digital data highway device
JPS5441002A (en) Data signal control system
JPS54918A (en) Facsimile transmission system
JPS5799858A (en) Public terminal communication system
JPS545544A (en) Control system for power line carrier in indoor load
JPS53123602A (en) Data transmission unit
JPS5386130A (en) Transmitting/receiving circuit of response confirmation type
JPS53131706A (en) Automatic telephone exchange system
JPS5431202A (en) Serial data transfer circuit
JPS53105923A (en) Automatic test system for ringer
JPS5715539A (en) Monitoring system for transmission system
JPS53131705A (en) Automatic telephone exchange system
JPS5755642A (en) Branch circuit communication system
JPS5787264A (en) Line monitoring system for high-level transmission control procedure
JPS5379407A (en) Terminal equipment for serites type interface
JPS53111227A (en) Communication device for multiple access
JPS5784651A (en) Transmission line monitoring system
JPS57161924A (en) Data gathering system