JPH01282946A - Line disconnection detector for digital line - Google Patents
Line disconnection detector for digital lineInfo
- Publication number
- JPH01282946A JPH01282946A JP11184788A JP11184788A JPH01282946A JP H01282946 A JPH01282946 A JP H01282946A JP 11184788 A JP11184788 A JP 11184788A JP 11184788 A JP11184788 A JP 11184788A JP H01282946 A JPH01282946 A JP H01282946A
- Authority
- JP
- Japan
- Prior art keywords
- line
- signal
- line disconnection
- digital
- terminals
- 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
- 238000001514 detection method Methods 0.000 claims abstract description 24
- 230000008054 signal transmission Effects 0.000 claims description 5
- 238000010586 diagram Methods 0.000 description 3
- 230000005856 abnormality Effects 0.000 description 1
- 230000007274 generation of a signal involved in cell-cell signaling Effects 0.000 description 1
Abstract
Description
【発明の詳細な説明】
〔産業上の利用分野〕
本発明は、ディジタル回線において回線断状態の故障検
知装置に利用する。DETAILED DESCRIPTION OF THE INVENTION [Industrial Field of Application] The present invention is applied to a failure detection device for a line disconnection state in a digital line.
本発明は、ディジタル信号伝送路の信号の有無を検知す
る回線断検知装置において、
互いに逆位相の信号を検出してこれを比較することによ
り、
構成が簡単で容易に測定できるようにしたものである。The present invention is a line disconnection detection device that detects the presence or absence of a signal on a digital signal transmission line, which has a simple configuration and can be easily measured by detecting and comparing signals with mutually opposite phases. be.
従来この種の回線断検知装置において、回線断を検出す
るのに、多数のコンパレーター、アンプ、抵抗などを備
えた複雑な回路を必要とした。Conventionally, this type of line disconnection detection device required a complicated circuit including a large number of comparators, amplifiers, resistors, etc. to detect line disconnection.
しかし、上述した従来の回線断検知装置では、回路部品
点数も多く、実装スペースが大きくなり、かつ価格も高
くなるという欠点がある。However, the above-described conventional line disconnection detection device has the drawbacks that it requires a large number of circuit components, requires a large mounting space, and is expensive.
本発明はこの欠点を解決して、簡単な構成により小形か
つ安価なディジタル回線の回線断検知装置を提供するこ
とを目的とする。SUMMARY OF THE INVENTION An object of the present invention is to solve this drawback and provide a small and inexpensive digital line disconnection detection device with a simple configuration.
ディジタル信号伝送路に接続される２個の端子と、この
端子より入力する信号を検出する２組の信号検出回路と
、このそれぞれの出力を比較する比較回路とを備えたデ
ィジタル回線の回線断検出装置において、
２組の信号検出回路は信号伝送路上の互いに逆位相の信
号を検出する回路であり、比較回路は排他的論理和回路
であることを特徴とする。Line disconnection detection for digital lines, which includes two terminals connected to a digital signal transmission line, two sets of signal detection circuits that detect signals input from these terminals, and a comparison circuit that compares their respective outputs. The apparatus is characterized in that the two sets of signal detection circuits are circuits that detect signals having opposite phases to each other on the signal transmission path, and the comparison circuit is an exclusive OR circuit.
互いに逆位相の信号を２つの信号検出回路により検出す
ると、正常である場合には２つの信号検出回路に交互に
出力が現れる。信号が断状態になると、２つの信号検出
回路には同一の信号が現れる。これを排他的論理和回路
により比較して、正常および異常を識別できる。When signals having mutually opposite phases are detected by two signal detection circuits, outputs appear alternately in the two signal detection circuits in the case of normal operation. When the signal is turned off, the same signal appears in the two signal detection circuits. By comparing this using an exclusive OR circuit, normality and abnormality can be identified.
次に、本発明の実施例を図面を参照して説明する。 Next, embodiments of the present invention will be described with reference to the drawings.
第１図は、本発明一実施例のブロック構成図である。FIG. 1 is a block diagram of an embodiment of the present invention.
本図において、送信装置１と受信装置２との間のディジ
タル回線は、信号側線３Ａと帰線３Ｂとにより構成され
る。−点鎖線で示される回線断検知装置４には、信号側
線３Ａと帰線３Ｂとにそれぞれ接続される端子Ｊｌｌお
よびＪ１２とを備えている。この回線断検知装置４は端
子Ｊ２１、Ｊ２２を備え、回線断の検知結果を図外の表
示装置などに送出する。In this figure, a digital line between a transmitting device 1 and a receiving device 2 is composed of a signal side line 3A and a return line 3B. - The line disconnection detection device 4 shown by the dotted chain line includes terminals Jll and J12 connected to the signal side line 3A and the return line 3B, respectively. This line disconnection detection device 4 includes terminals J21 and J22, and sends the line disconnection detection result to a display device (not shown) or the like.
ここに本発明の特徴とするところは、上記端子Ｊｌｌお
よびＪ１２からそれぞれの入力する信号により互いに逆
位相の信号波形を発生する信号発生回路であるフォトカ
ブラＰｃｔおよびＰＯ２と、このフォトカブラＰｃｔお
よびＰＯ２のそれぞれの出力を比較する排他的論理和回
路ＩＣＩとを備えたことにある。Here, the present invention is characterized by photocoupler Pct and PO2, which are signal generation circuits that generate signal waveforms with opposite phases from each other by signals inputted from the terminals Jll and J12, respectively, and photocoupler Pct and PO2. and an exclusive OR circuit ICI for comparing the outputs of the respective outputs.
第２図は、上記実施例の動作を示すタイムチャートであ
る。FIG. 2 is a time chart showing the operation of the above embodiment.
回線３Ａおよび３Ｂに正常なディジタル信号が伝送され
ており、端子ＪｌｌおよびＪ１２からの入力により、フ
ォトカプラＰＣＩおよびＰＯ２の出力は、それぞれレベ
ル″Ｈ″および“Ｌ”の逆位相の信号である。排他的論
理和回路ＩＣＩでは、これらの出力が常に逆位相になっ
ているか否かを比較し、逆になっている場合は、端子Ｊ
２１の出力を常に“Ｌ″となるようにする。Normal digital signals are being transmitted to the lines 3A and 3B, and due to the inputs from the terminals Jll and J12, the outputs of the photocouplers PCI and PO2 are signals with levels "H" and "L" and opposite phases, respectively. The exclusive OR circuit ICI compares whether or not these outputs are always in opposite phases, and if they are, the terminal J
The output of 21 is always set to "L".
回線断により端子Ｊｌｌ、Ｊ１２に信号が入力されない
場合は、フォトカプラＰｃｔおよびＰＯ２の出力は、と
もにＨレベルとなるので、排他的論理和回路ＰＣＩには
、ともに”Ｈ”レベルが入力される。このため、出力端
子Ｊ２１、Ｊ２２側には、“Ｈ″信号出力される。これ
により回線断が検知される。When no signals are input to the terminals Jll and J12 due to line disconnection, the outputs of the photocouplers Pct and PO2 both go to H level, and therefore, the "H" level is input to the exclusive OR circuit PCI. Therefore, an "H" signal is output to the output terminals J21 and J22. This allows line disconnection to be detected.
第１図において、回線断検知装置４の端子Ｊｌｌおよび
Ｊ１２はそれぞれ回線３Ａおよび３Ｂにそれぞれ接続さ
れていたが、これを第３図に示すようにいずれか一方の
回線（第３図では回線３Ｂ＞に接続することもできる。In FIG. 1, the terminals Jll and J12 of the line disconnection detection device 4 are connected to the lines 3A and 3B, respectively, but as shown in FIG. > can also be connected.
以上説明したように本発明によれば、簡単な回路構成に
より、部品実装スペースが小さくかつ安価なディジタル
回線の回線断検知装置を実現できる効果がある。As described above, according to the present invention, it is possible to realize a line disconnection detection device for a digital line that requires a small component mounting space and is inexpensive, with a simple circuit configuration.
第１図は本発明一実施例のブロック構成図。
第２図は上記実施例の動作タイムチャート。
第３図は本発明その他の実施例の接続図。
■・・・送信装置、２・・・受信装置、３Ａ、３Ｂ・・
・回線、４・・・回線断検知装置、Ｊｌｌ、Ｊ１２・・
・入力端子、Ｊ２１、Ｊ２２・・・回線断検知出力端子
、ＰＣＩ、ＰＯ２・・・入カフオドカプラ、Ｒ１、Ｒ２
・・・入力端子を制限する抵抗、Ｒ３、Ｒ４・・・プル
アップ抵抗、ＩＣ１・・・排他的論理和回路。FIG. 1 is a block diagram of an embodiment of the present invention. FIG. 2 is an operation time chart of the above embodiment. FIG. 3 is a connection diagram of other embodiments of the present invention. ■...Transmitting device, 2...Receiving device, 3A, 3B...
・Line, 4... Line disconnection detection device, Jll, J12...
・Input terminal, J21, J22...Line disconnection detection output terminal, PCI, PO2...Input coupler, R1, R2
...Resistor that limits the input terminal, R3, R4...Pull-up resistor, IC1...Exclusive OR circuit.
Claims (1)
端子と、この２個の端子の信号を入力する２組の信号検
出回路と、この信号検出回路の各出力を比較する比較回
路とを備えた回線断検知装置において、 上記２組の信号検出回路は上記信号伝送路上の互いに逆
位相の信号を検出する回路であり、上記比較回路は排他
的論理和回路である ことを特徴とするディジタル回線の回線断検知装置。[Claims] 1. Comparison of two terminals each connected to a digital signal transmission line, two sets of signal detection circuits that input signals from these two terminals, and each output of this signal detection circuit. In the line disconnection detection device, the two sets of signal detection circuits are circuits that detect signals having opposite phases to each other on the signal transmission path, and the comparison circuit is an exclusive OR circuit. A line disconnection detection device for a digital line, which is characterized by:
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP11184788A JPH01282946A (en) | 1988-05-09 | 1988-05-09 | Line disconnection detector for digital line |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP11184788A JPH01282946A (en) | 1988-05-09 | 1988-05-09 | Line disconnection detector for digital line |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH01282946A true JPH01282946A (en) | 1989-11-14 |
Family
ID=14571658
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP11184788A Pending JPH01282946A (en) | 1988-05-09 | 1988-05-09 | Line disconnection detector for digital line |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH01282946A (en) |
-
1988
- 1988-05-09 JP JP11184788A patent/JPH01282946A/en active Pending
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