JPS5822888B2 - Occasional disconnection failure monitoring device for data transmission line - Google Patents
Occasional disconnection failure monitoring device for data transmission lineInfo
- Publication number
- JPS5822888B2 JPS5822888B2 JP54008526A JP852679A JPS5822888B2 JP S5822888 B2 JPS5822888 B2 JP S5822888B2 JP 54008526 A JP54008526 A JP 54008526A JP 852679 A JP852679 A JP 852679A JP S5822888 B2 JPS5822888 B2 JP S5822888B2
- Authority
- JP
- Japan
- Prior art keywords
- transmission line
- data transmission
- capacitors
- monitoring device
- failure monitoring
- 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.)
- Expired
Links
Classifications
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B3/00—Line transmission systems
- H04B3/02—Details
- H04B3/46—Monitoring; Testing
Landscapes
- Engineering & Computer Science (AREA)
- Computer Networks & Wireless Communication (AREA)
- Signal Processing (AREA)
- Testing Of Short-Circuits, Discontinuities, Leakage, Or Incorrect Line Connections (AREA)
- Detection And Prevention Of Errors In Transmission (AREA)
- Bidirectional Digital Transmission (AREA)
- Dc Digital Transmission (AREA)
- Maintenance And Management Of Digital Transmission (AREA)
- Monitoring And Testing Of Transmission In General (AREA)
Description
【発明の詳細な説明】
本発明は平衡伝送路に伝送されるデータ伝送の時々断を
監視するための装置に関する。DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a device for monitoring occasional interruptions in data transmission transmitted over a balanced transmission line.
従来データ伝送路の時々断を監視する装置は、受信側に
到来する信号レベルを測定し、そのレベルが一定値以下
になったときを伝送路の断線と判断するものである。A conventional device for monitoring occasional disconnections in a data transmission line measures the level of a signal arriving at the receiving side, and determines that the transmission line is disconnected when the level falls below a certain value.
したがって装置は必ず受信側に接続しなければならない
ので、交換局での集中監視には不便であり、双方向二線
式のデータ伝送路では、監視装置を両端に配置しなけれ
ばならない欠点があった。Therefore, the device must be connected to the receiving side, which is inconvenient for centralized monitoring at the switching center, and bidirectional two-wire data transmission lines have the disadvantage that monitoring devices must be placed at both ends. Ta.
本発明はこれを改良するもので、データ伝送路の時々断
障害の監視を送信側、受信側あるいは伝送路の中間点に
おいても行うことのできる装置を提供することを目的と
する。The present invention is an improvement on this, and an object of the present invention is to provide a device that can monitor occasional interruptions in a data transmission line at the transmitting side, receiving side, or even at an intermediate point of the transmission line.
本発明は、実稼動中のデータ伝送回線の対地電位または
対地静電容量の不平衡を検出することによりデータ伝送
路の時々断を監視することを特徴とする。The present invention is characterized in that occasional interruptions in the data transmission line are monitored by detecting unbalance in the ground potential or ground capacitance of the data transmission line during actual operation.
すなわち本発明は、平衡伝送路の各線にその一端が接続
された容量値のほぼ等しい２個のコンデンサと、この２
個のコンデンサの各他端にそれぞれその一端が接続され
、他端がそれぞれ接地された抵抗値のほぼ等しい第一の
２個の抵抗と、上記２個のコンデンサの各他端にそれぞ
れその一端が接続され、他端が共通に接続された抵抗値
のほぼ等しい第二の２個の抵抗器と、この第二の２個の
抵抗器の共通に接続された上記他端と接地との間に現わ
れる電圧を入力とする増幅器とを備え、この増幅器の出
力レベルを監視するように構成されたことを特徴とする
。In other words, the present invention provides two capacitors with approximately equal capacitance values, one end of which is connected to each line of a balanced transmission line;
The first two resistors have approximately equal resistance values, one end of which is connected to the other end of each of the two capacitors, and the other end of which is grounded. between two second resistors having substantially equal resistance values connected to each other, the other ends of which are connected in common, and the other ends of the second two resistors which are connected in common and the ground. The present invention is characterized in that it includes an amplifier that receives the voltage that appears as an input, and is configured to monitor the output level of this amplifier.
実施例図面により詳しく説明する。This will be explained in detail with reference to the drawings.
図は本発明実施例装置の構成図である。The figure is a configuration diagram of an apparatus according to an embodiment of the present invention.
２台のデータ通信装置１および２は、平衡対ケーブルに
よるデータ伝送路３により結合され、相互にデータ伝送
を行うよう構成されている。The two data communication devices 1 and 2 are connected by a data transmission path 3 using a balanced pair cable, and are configured to mutually transmit data.
このデータ伝送路３のケーブルの電位は、コード４によ
り取出され、それぞれ直流阻止用のコンデンサ５および
６の一端に接続されている。The potential of the cable of this data transmission path 3 is taken out by a cord 4, which is connected to one end of DC blocking capacitors 5 and 6, respectively.
このコンデンサ５および６の他端は、それぞれ接地との
間に抵抗７および８が接続されるとともに、抵抗９およ
び１０により反転増幅器１２の入力に接続されている。The other ends of the capacitors 5 and 6 are connected to ground through resistors 7 and 8, respectively, and to the input of an inverting amplifier 12 through resistors 9 and 10.
抵抗１３はこの増幅器１２の帰還抵抗であり、この増幅
器１２の出力はレコーダ１４の入力に導かれている。A resistor 13 is a feedback resistor for this amplifier 12, and the output of this amplifier 12 is led to the input of a recorder 14.
ここで、コンデンサ５と６、抵抗７と８、または抵抗９
と１０はそれぞれ等しい値となるよう構成されている。Here, capacitors 5 and 6, resistors 7 and 8, or resistor 9
and 10 are configured to have the same value.
レコーダ１４は入力に到来する信号の回数を計数し、ま
たは信号の到来時刻を記録するように構成されている。The recorder 14 is configured to count the number of times a signal arrives at the input or to record the time of arrival of a signal.
このように構成された装置では、両データ通信装置１お
よび２の間に正常なデータ通信が行われているときには
、データ伝送路３は平衡であるので、抵抗７と８に現わ
れる電位は互いに絶対値の等しい逆位相の値である。In the device configured in this way, when normal data communication is being performed between both data communication devices 1 and 2, the data transmission path 3 is balanced, so the potentials appearing on the resistors 7 and 8 are absolutely equal to each other. They are equal and opposite in phase.
したがって、増幅器１２の入力と接地間には電圧が現わ
れず、レコー。Therefore, no voltage appears between the input of amplifier 12 and ground, and record.
ダ１４の入力にも信号はない。There is also no signal at the input of driver 14.
いま、データ伝送路３に図にＸ印で示す位置で時々断が
発生すると、データ伝送路３は不平衡になる。Now, if a disconnection occasionally occurs in the data transmission line 3 at the position indicated by the X mark in the figure, the data transmission line 3 becomes unbalanced.
このとき抵抗７および８の各両端に現われる電位をそれ
ぞれｅｌおよびｅ２とし、抵抗９およ、′び１０の値を
ｒとすると、増幅器１２の入力端に、なる電流が流れ込
む。If the potentials appearing across the resistors 7 and 8 at this time are el and e2, respectively, and the values of the resistors 9, ' and 10 are r, then a current flows into the input terminal of the amplifier 12.
抵抗１３の値をＲとすれば、このときレコーダー４の入
力には
（ｅ１＋ｅ２）Ｒ
なる電圧が現われる。If the value of the resistor 13 is R, then a voltage of (e1+e2)R appears at the input of the recorder 4.
この電圧が一定値以上のときレコーダー４に記録される
。When this voltage is above a certain value, it is recorded on the recorder 4.
このように、本発明の装置はデータ伝送路の対地電位平
衡を検出するのであるから、装置を受信側に限らず、送
信側あるいは伝送路の任意の位置・に接続することがで
きる。As described above, since the device of the present invention detects the ground potential balance of the data transmission path, the device can be connected not only to the receiving side but also to the transmitting side or at any arbitrary position on the transmission path.
データ伝送路に双方向の信号が伝送される場合にも、両
端に配置する必要はなく１個所でよい。Even when bidirectional signals are transmitted on the data transmission path, it is not necessary to place them at both ends, and only one place is sufficient.
また、この装置を交換局に配置して多数の回線を集中的
に監視することが可能であり、監視作業の能率を向上す
ることができ、さらに回線の接続によりインピーダンス
が変動しても、回線が平衡である限り検出出力がないの
で、誤検出が少ない優れた効果がある。In addition, this device can be placed at a switching center to centrally monitor a large number of lines, improving the efficiency of monitoring work, and even if the impedance changes due to line connections, the line Since there is no detection output as long as is balanced, there is an excellent effect of reducing false detections.
本発明を実施することにより、データ伝送路の監視が経
済的かつ容易となり、データ伝送路の信頼性確保□に大
きく貢献する。By implementing the present invention, monitoring of the data transmission path becomes economical and easy, and greatly contributes to ensuring the reliability of the data transmission path.
なお、上記例に示す回路以外の構成によっても、データ
伝送路の対地電位の不平衡を検出する手段はさまざまに
考えられ、これらによっても同様に本発明を実施するこ
とができる。It should be noted that various means for detecting the unbalance of the ground potential of the data transmission path can be considered with configurations other than the circuit shown in the above example, and the present invention can be implemented in the same manner with these.
図は本発明実施例装置構成図。
１．２・・・・・・データ通信装置、３・・・・・・デ
ータ伝送路、１２・・・・・・反転増幅器、１４・・・
・・・レコーダ。The figure is a configuration diagram of an apparatus according to an embodiment of the present invention. 1.2... Data communication device, 3... Data transmission line, 12... Inverting amplifier, 14...
...Recorder.
Claims (1)
た障害監視装置において、 上記平衡伝送路の各線にその一端が接続され、容量値の
ほぼ等しい２４薗のコンデンサ５，６と、この２個のコ
ンデンサの各他端にそれぞれその一端が接続され、他端
がそれぞれ接地され、抵抗値のほぼ等しい第一の２個の
抵抗７，８と、上記２個のコンデンサの各他端にそれぞ
れその一端が接続され、他端が共通に接続され、抵抗値
のほぼ等しい第二の２個の抵抗器９，１０と、この第二
の２個の抵抗器の共通に接続された上記他端と接地との
間に現われる電圧を入力とする増幅器１２と を備え、 この増幅器の出力レベルを監視するように構成されたこ
とを特徴とする データ伝送路の時々断障害監視装置。[Scope of Claims] 1. In a fault monitoring device connected to a two-wire balanced transmission line through which data signals are transmitted, one end of which is connected to each line of the balanced transmission line, and 24 capacitors 5 having approximately equal capacitance values. , 6, one end of which is connected to the other end of each of these two capacitors, the other end of which is grounded, and two first resistors 7 and 8 having approximately equal resistance values, and the two capacitors. One end of the second resistor 9, 10 is connected to the other end of the second resistor, the other end of which is connected in common, and the resistance value is approximately equal to the second resistor 9, 10. Occasional disconnection failure monitoring of a data transmission line, comprising an amplifier 12 whose input is the voltage appearing between the other connected end and ground, and configured to monitor the output level of the amplifier. Device.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP54008526A JPS5822888B2 (en) | 1979-01-26 | 1979-01-26 | Occasional disconnection failure monitoring device for data transmission line |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP54008526A JPS5822888B2 (en) | 1979-01-26 | 1979-01-26 | Occasional disconnection failure monitoring device for data transmission line |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS55100773A JPS55100773A (en) | 1980-07-31 |
| JPS5822888B2 true JPS5822888B2 (en) | 1983-05-12 |
Family
ID=11695579
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP54008526A Expired JPS5822888B2 (en) | 1979-01-26 | 1979-01-26 | Occasional disconnection failure monitoring device for data transmission line |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS5822888B2 (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4373121A (en) * | 1981-06-15 | 1983-02-08 | Bell Telephone Laboratories, Incorporated | Maintenance termination device |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS534412A (en) * | 1976-07-02 | 1978-01-17 | Hitachi Ltd | Test method for subscribing lines |
-
1979
- 1979-01-26 JP JP54008526A patent/JPS5822888B2/en not_active Expired
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS534412A (en) * | 1976-07-02 | 1978-01-17 | Hitachi Ltd | Test method for subscribing lines |
Also Published As
| Publication number | Publication date |
|---|---|
| JPS55100773A (en) | 1980-07-31 |
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