JPS6084050A - Line disconnection detecting circuit - Google Patents
Line disconnection detecting circuitInfo
- Publication number
- JPS6084050A JPS6084050A JP58095643A JP9564383A JPS6084050A JP S6084050 A JPS6084050 A JP S6084050A JP 58095643 A JP58095643 A JP 58095643A JP 9564383 A JP9564383 A JP 9564383A JP S6084050 A JPS6084050 A JP S6084050A
- Authority
- JP
- Japan
- Prior art keywords
- circuit
- line disconnection
- photocoupler
- output
- goes
- 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
Classifications
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L25/00—Baseband systems
- H04L25/02—Details ; arrangements for supplying electrical power along data transmission lines
- H04L25/20—Repeater circuits; Relay circuits
- H04L25/26—Circuits with optical sensing means, i.e. using opto-couplers for isolation
Abstract
Description
【発明の詳細な説明】
〔発明の利用分野〕
本発明は差動式デジタル信号伝送装置に係シ、特に、回
線断検出をするに好適な回路に関する。DETAILED DESCRIPTION OF THE INVENTION [Field of Application of the Invention] The present invention relates to a differential digital signal transmission device, and more particularly to a circuit suitable for line disconnection detection.
従来の差動式テジタル伝送装置の受信側は、第１図に示
すように、受信用の７オトカプラと、これに逆並列接続
されたダイオードにより構成されており、差動式でない
ものと比較すると、＾速伝送及び長距離伝送に適した方
式として利用されてデータ送信回路ｌに１対の伝送路２
が接続され、その終端にフォトカブ２３と逆並列に接続
されたダイオード４が設置されている。データ送信回路
の入力に、信号％ｌＮがあれば、フォトカプラ３の中の
ダイオードに電流が流れ、′ｌ〃がめったことをデータ
として伝送する。又、データ送信装置に入力が無い場合
にはダイオード４に電流が流れ、フォトカブ２３をバイ
ノくスするようになっている。As shown in Figure 1, the receiving side of a conventional differential digital transmission device consists of 7 receiving Otocouplers and diodes connected in anti-parallel to this. , ^ It is used as a system suitable for high-speed transmission and long-distance transmission, and a pair of transmission lines 2 are used in the data transmission circuit l.
is connected, and a diode 4 connected in antiparallel to the photocube 23 is installed at its terminal end. If the signal %lN is present at the input of the data transmitting circuit, a current flows through the diode in the photocoupler 3, and the fact that 'l〃 is rare is transmitted as data. Further, when there is no input to the data transmitting device, current flows through the diode 4, and the photocube 23 is binoxed.
しかし、送信データが全て１０〃なのか、伝送路、伝送
回路に異常がアシ、フォトカプラ出力が１０〃なのか区
別が出来ない欠点がおった。However, there was a drawback that it was impossible to distinguish whether the transmitted data were all 10, or whether there was an abnormality in the transmission line or circuit, or whether the photocoupler output was 10.
本発明の目的は、差動式デジタル伝送装置に回線断検出
回路を設けた、高機能な差動式デジタル伝送装置を提供
するにある。An object of the present invention is to provide a highly functional differential digital transmission device in which a line disconnection detection circuit is provided in the differential digital transmission device.
本発明は、差動式デジタル伝送装置を用いた伝送路にお
いて、回線断が無ければ必らずどちらか一方の方向には
電流が流れていることを利用し、前記４流が無くなった
乙とｔ検出することによシ、回線断の検出ができるよう
にしたものである。The present invention utilizes the fact that in a transmission line using a differential digital transmission device, current always flows in one direction unless there is a line break, and the present invention utilizes the fact that current always flows in one direction when the four currents disappear By detecting t, line disconnection can be detected.
第２図は本発明の一実施例で、データ受信用フォトカプ
ラ３に、回線断検出用フォトカブ２５が逆並列に接続さ
れ、両フォトカプラの出力はＯＲ回路６に接続される。FIG. 2 shows an embodiment of the present invention, in which a data reception photocoupler 3 is connected in antiparallel to a line disconnection detection photocube 25, and the outputs of both photocouplers are connected to an OR circuit 6.
差動式ディジタル伝送方式は、常にいずれかの方向に電
流を流すことから、フォトカプラ３又は５のいずれか一
方は必らず１１１となシ、０几回路６の出力は必ず１１
Ｉとなる。In the differential digital transmission method, current always flows in either direction, so either photocoupler 3 or 5 is not necessarily 111, and the output of 0 circuit 6 is always 11.
Becomes I.
今、伝送回路２が断線、或いは、送信回路１の電源が断
になると、フォトカプラ３、および５の出力は共に１０
〃とな如、０几回路の出力は％ＯＲとなる。Now, if the transmission circuit 2 is disconnected or the power of the transmission circuit 1 is cut off, the outputs of the photocouplers 3 and 5 will both be 10
〃, the output of the zero circuit becomes %OR.
これによ）回線断を検出することが出来る。This allows line disconnection to be detected.
第１図は従来の差動式デジタル伝送装置の一実施例の系
統図、第２図は本発明の回線断検出回路の含めた差動式
デジタル伝送装置の一実施例の系統図である。FIG. 1 is a system diagram of an embodiment of a conventional differential digital transmission device, and FIG. 2 is a system diagram of an embodiment of a differential digital transmission device including a line disconnection detection circuit of the present invention.
Claims (1)
置において、 データ受１ａ用フォトカプラに逆並列盾絖され７’ｉ＝
フオトカプラと、前記データ受イイ用ンオトカプシの出
力と、ＯＩＪ記逆記動並列接続ォトカプラの出力との論
理第１回路を備えたことをＩｌｉ徴とする回線断検出回
路。[Claims] 1. In a differential digital signal transmission device using a photocoupler, an antiparallel shield is connected to the photocoupler for the data receiver 1a, and 7'i=
A line disconnection detection circuit characterized by comprising a photocoupler, a logic first circuit for the output of the photocoupler for data reception, and the output of the OIJ recording parallel connection photocoupler.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP58095643A JPS6084050A (en) | 1983-06-01 | 1983-06-01 | Line disconnection detecting circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP58095643A JPS6084050A (en) | 1983-06-01 | 1983-06-01 | Line disconnection detecting circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPS6084050A true JPS6084050A (en) | 1985-05-13 |
Family
ID=14143185
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP58095643A Pending JPS6084050A (en) | 1983-06-01 | 1983-06-01 | Line disconnection detecting circuit |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS6084050A (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS6256873A (en) * | 1985-09-05 | 1987-03-12 | Chubu Electric Power Co Inc | Short circuit detecting and display device |
| JPS63215139A (en) * | 1987-03-04 | 1988-09-07 | Nec Corp | Detecting system for fault of signal in balanced double-current interchange |
| JPS63171049U (en) * | 1986-12-24 | 1988-11-08 |
-
1983
- 1983-06-01 JP JP58095643A patent/JPS6084050A/en active Pending
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS6256873A (en) * | 1985-09-05 | 1987-03-12 | Chubu Electric Power Co Inc | Short circuit detecting and display device |
| JPH0584470B2 (en) * | 1985-09-05 | 1993-12-02 | Chubu Electric Power | |
| JPS63171049U (en) * | 1986-12-24 | 1988-11-08 | ||
| JPS63215139A (en) * | 1987-03-04 | 1988-09-07 | Nec Corp | Detecting system for fault of signal in balanced double-current interchange |
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