JPS646878A - Differential digital transmission line - Google Patents

Differential digital transmission line

Info

Publication number
JPS646878A
JPS646878A JP62161338A JP16133887A JPS646878A JP S646878 A JPS646878 A JP S646878A JP 62161338 A JP62161338 A JP 62161338A JP 16133887 A JP16133887 A JP 16133887A JP S646878 A JPS646878 A JP S646878A
Authority
JP
Japan
Prior art keywords
line
transmission line
level
outputs
differential digital
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
Application number
JP62161338A
Other languages
Japanese (ja)
Inventor
Kenji Hara
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.)
Yaskawa Electric Corp
Original Assignee
Yaskawa Electric Manufacturing 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 Yaskawa Electric Manufacturing Co Ltd filed Critical Yaskawa Electric Manufacturing Co Ltd
Priority to JP62161338A priority Critical patent/JPS646878A/en
Publication of JPS646878A publication Critical patent/JPS646878A/en
Pending legal-status Critical Current

Links

Abstract

PURPOSE:To detect the disconnection of a differential digital transmission line by a few parts by connecting two photocouplers to the power reception terminal of the differential digital transmission line so that the polarities of their input parts are opposite to the transmission line. CONSTITUTION:A line driver 2 combines and sends out positive and negative path signals Q and -Q to the line of the transmission line at the same time. A photocoupler 3 whose input part is connected to the power reception terminal in the positive direction of the line 1 is used as a line receiver and a LED 4 is activated when a pulse signal Q is at high level to outputs a high-level signal 5. A photocoupler 6, on the other hand, has its input part connected in the opposite direction from said line 1 and an LED 7 outputs a high-level signal 8 when the pulse -Q is at high level. If the line 1 of the transmission line becomes abnormal, the output signals 5 and 8 of both photocouplers 3 and 6 turn off, i.e. low and a NOR circuit 11 outputs a high-level disconnection warning signal 12.
JP62161338A 1987-06-30 1987-06-30 Differential digital transmission line Pending JPS646878A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP62161338A JPS646878A (en) 1987-06-30 1987-06-30 Differential digital transmission line

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP62161338A JPS646878A (en) 1987-06-30 1987-06-30 Differential digital transmission line

Publications (1)

Publication Number Publication Date
JPS646878A true JPS646878A (en) 1989-01-11

Family

ID=15733181

Family Applications (1)

Application Number Title Priority Date Filing Date
JP62161338A Pending JPS646878A (en) 1987-06-30 1987-06-30 Differential digital transmission line

Country Status (1)

Country Link
JP (1) JPS646878A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0784207A1 (en) * 1995-07-26 1997-07-16 Ntt Data Corporation Lan tester

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0784207A1 (en) * 1995-07-26 1997-07-16 Ntt Data Corporation Lan tester
EP0784207A4 (en) * 1995-07-26 2001-08-22 Ntt Data Corp Lan tester

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