JPS6132854B2 - - Google Patents
Info
- Publication number
- JPS6132854B2 JPS6132854B2 JP16523880A JP16523880A JPS6132854B2 JP S6132854 B2 JPS6132854 B2 JP S6132854B2 JP 16523880 A JP16523880 A JP 16523880A JP 16523880 A JP16523880 A JP 16523880A JP S6132854 B2 JPS6132854 B2 JP S6132854B2
- Authority
- JP
- Japan
- Prior art keywords
- signal
- under test
- output
- output signal
- line under
- 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
- 238000012360 testing method Methods 0.000 claims description 30
- 238000004891 communication Methods 0.000 claims description 13
- 238000012806 monitoring device Methods 0.000 claims description 2
- 230000001629 suppression Effects 0.000 description 6
- 230000007274 generation of a signal involved in cell-cell signaling Effects 0.000 description 4
- 238000000034 method Methods 0.000 description 3
- 230000005540 biological transmission Effects 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 238000005259 measurement Methods 0.000 description 2
- 239000004020 conductor Substances 0.000 description 1
- 238000012544 monitoring process Methods 0.000 description 1
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)
- Monitoring And Testing Of Transmission In General (AREA)
Description
【発明の詳細な説明】
本発明は、通信ケーブル回線に発生する時々断
を監視するための装置に関するものである。DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a device for monitoring occasional interruptions that occur in communication cable lines.
従来、通信ケーブル回線に発生する時々断（通
信ケーブル回線に含まれる接点もしくは心線接続
部で、瞬間的かつ偶発的に発生する不完全接触に
より、この通信ケーブル回線を伝送する情報信号
に有害な程度のレベル変動あるいは瞬断を招く現
象を言う）を監視する装置としては、被測定回線
の一端から一定周波数を通信ケーブル回線に送出
し、他端でその信号を受信して急激なレベル変動
またはレベル断の有無を測定するものが知られて
いる。しかし、この方法では漏話等によつて被測
定回線に発生するインパルス性雑音によるレベル
変動をも同時に測定してしまうため、検出された
情報（発生頻度、発生時間率等）が、通信ケーブ
ル回線の接点もしくは心線接続部の不完全接触に
より発生した時々断によるものか、又はこの回線
に漏話等により発生したインパルス性雑音による
ものか、判定することができず、したがつて、
時々断のみを的確に測定することができない。 Conventionally, occasional breaks in communication cable lines (instantaneous and accidental incomplete contact at contacts or core connections included in communication cable lines) have been known to cause damage to the information signals transmitted through the communication cable lines. This device sends a constant frequency from one end of the line under test to the communication cable line, and receives the signal at the other end to detect sudden level changes or instantaneous interruptions. There are known devices that measure the presence or absence of level failure. However, this method simultaneously measures level fluctuations due to impulsive noise generated in the line under test due to crosstalk, etc., so the detected information (occurrence frequency, occurrence time rate, etc.) It is not possible to determine whether this is due to occasional disconnections caused by incomplete contact between contacts or core wire connections, or impulsive noise caused by crosstalk, etc. in this line, and therefore,
Sometimes it is not possible to accurately measure only the cut.
このため、通信線路の接続点等の不完全接触に
起因した回線時々断問題を定量化して、その対策
を講ずることができなかつた。 For this reason, it has not been possible to quantify the occasional disconnection problem caused by incomplete contact at communication line connection points and take countermeasures.
本発明は、これらの欠点を解決するもので、１
対の被測定回線（以下、２本の心線をそれぞれ
L1，L2と称す）と大地との間に一定周波数の信
号又は直流信号を送出する信号発生器と、上記被
測定回線の心線間の電圧を検出する不平衡電圧検
出器と、被測定回線のそれぞれの心線大地間電圧
を検出し、漏話等により被測定回線に発生したイ
ンパルス性雑音による不平衡電圧検出器の出力信
号を抑制する出力信号制御部とを備え、インパル
ス性雑音発生時に、被測定回線のL1，L2に現わ
れるそれぞれの心線大地間電圧の大きさ、波形お
よび発生時間の同一性を利用して被測定回線の
L1，L2に同時に、ある適当なレベル以上の心線
大地間電圧を検出した場合には、不平衡電圧検出
器の出力信号を抑制することによつて、被測定ケ
ーブル回線の接続部等の不完全接触に起因した純
粋な時々断のみを検出することを特徴とするもの
で、以下図面について詳細に説明する。 The present invention solves these drawbacks, and has 1
A pair of lines under test (hereinafter, two core wires are each
A signal generator that sends a constant frequency signal or a DC signal between the wires (referred to as L 1 and L 2 ) and the ground; an unbalanced voltage detector that detects the voltage between the cores of the line under test; It is equipped with an output signal control unit that detects the voltage between each core wire and ground of the measurement line and suppresses the output signal of the unbalanced voltage detector due to impulsive noise generated in the line under measurement due to crosstalk etc. Sometimes, the line under test is determined by using the sameness of the magnitude, waveform, and occurrence time of the respective core wire ground voltages appearing in L 1 and L 2 of the line under test.
If a wire-to-ground voltage higher than a certain appropriate level is detected at the same time in L 1 and L 2 , the output signal of the unbalanced voltage detector is suppressed to detect the connection part of the cable line under test, etc. This method is characterized by detecting only pure occasional breaks caused by incomplete contact of the contact point, and will be described in detail below with reference to the drawings.
図は本発明の実施例装置のブロツク回路図であ
る。１〜２，３〜４は電話局内または回線端末に
ある被測定通信ケーブル回線の接続端子である。
接続端子１，２および３，４には、それぞれ被測
定回線の特性インピーダンスZ0の１／２に等しい大き
さの整合用終端抵抗５，６および５′，６′の一端
が接続されており、整合用終端抵抗５，６および
５′，６′の他端は接地されている。７は任意の一
定周波数０の正弦波信号または、直流信号を発
生する信号発生器であり、接続端子１および２よ
り、被測定回線と大地との間に信号が送出され
る。８は、被測定回線の対地に対する不平衡によ
つて生ずる心線L1，L2間に現われる電圧を検出
する不平衡電圧検出器である。 The figure is a block circuit diagram of an embodiment of the present invention. Reference numerals 1 to 2 and 3 to 4 are connection terminals of the communication cable line to be measured located in the telephone office or at the line terminal.
Connection terminals 1, 2, 3, and 4 are connected to one ends of matching terminating resistors 5, 6, and 5', 6', each having a size equal to 1/2 of the characteristic impedance Z0 of the line under test. , the other ends of the matching terminating resistors 5, 6 and 5', 6' are grounded. Reference numeral 7 denotes a signal generator that generates a sine wave signal or a DC signal with an arbitrary constant frequency of 0 , and the signal is sent from connection terminals 1 and 2 between the line under test and the ground. Reference numeral 8 denotes an unbalanced voltage detector that detects the voltage appearing between the core wires L 1 and L 2 caused by the unbalance of the line under test with respect to the ground.
９は接続端子１および２から、それぞれ各心線
大地間電圧を検出し、時々断以外の雑音（例えば
漏話等により被測定回線に発生したインパルス性
雑音）による不平衡電圧検出器８の出力信号を抑
制するための出力信号制御部である。出力信号制
御部９は、１０〜１３の比較回路、１４の正の比
較レベル信号入力端子および１５の負の比較レベ
ル信号入力端子、１６〜１７のAND回路、１８
のOR回路、１９の出力抑制信号発生回路および
２０の出力制御回路による構成されている。２１
は時々断信号出力端子である。 Reference numeral 9 detects the voltage between each core wire and ground from connection terminals 1 and 2, and occasionally detects the output signal of unbalanced voltage detector 8 due to noise other than disconnection (for example, impulsive noise generated in the line under test due to crosstalk, etc.) This is an output signal control unit for suppressing. The output signal control unit 9 includes comparison circuits 10 to 13, a positive comparison level signal input terminal 14 and a negative comparison level signal input terminal 15, AND circuits 16 to 17, and 18
The circuit includes an OR circuit, 19 output suppression signal generation circuits, and 20 output control circuits. 21
is sometimes disconnected signal output terminal.
次に本発明の通信ケーブル回線時々断監視装置
の動作を図に従つて説明する。 Next, the operation of the communication cable line occasional disconnection monitoring device of the present invention will be explained with reference to the drawings.
被測定回線は平衡対ケーブルであつて、接続端
子１，２および３，４は整合用終端抵抗５，６お
よび５′，６′が接続され、伝送線路は無反射であ
り、大地に対しては良好な平衡状態にある。不平
衡電圧検出器８および比較回路１０〜１３の各入
力インピーダンスは十分に高く、被測定回線の整
合と大地に対する平衡には影響しない。この状態
で、信号発生器７より、一定周波数０の正弦波
信号または直流信号を被測定回線と大地との間に
送出する。被測定回線が平衡な状態であり、かつ
漏話等により被測定回線にインパルス性雑音が発
生していない状態では、不平衡電圧検出器８の出
力信号は出力されない。この状態でいま、Ｐ点に
おいて、導体接続の不完全接触によつて時々断が
生じたとする。時々断の瞬間には、被測定回線の
大地に対する平衡が失われるため、不平衡電圧検
出器８に出力信号が現われる。このとき出力信号
制御部９においては、適当なレベル（例えば、信
号発生器７より、被測定回線L1，L2に同相の信
号を送出し、不平衡電圧を差動増幅器を用いて検
出する方法の場合で、差動増幅器の同相除去比を
40dB、不平衡電圧検出器最小レベルを10mVとし
た時は、1V以上のレベル）に設定された正、負
の比較レベル信号がそれぞれ正、負の比較レベル
信号入力端子１４，１５により、比較回路１０〜
１３に入力される。この正、負の比較レベルと、
接続端子１，２より入力された心線大地間電圧と
を比較回路１０〜１３で比較し、心線大地間電圧
が比較レベルを越えたとき、比較回路より信号が
出力される。Ｐ点で時々断が生じた場合、通信ケ
ーブル接続端子１の大地間電圧が高くなる。この
大地間電圧が適当な値に設定された比較レベルを
越える場合には比較回路１１または１３から出力
信号が現われるが、通信ケーブル接続端子２の大
地間電圧には変化がないため比較回路１０と１
１、または比較回路１２と１３から同時に出力信
号が現われない。このため、AND回路１６また
は１７の出力信号は出力されない。したがつて出
力抑制信号発生回路より出力抑制信号が出力され
ないため、不平衡電圧検出器８の出力信号は、出
力制御回路２０を介して、そのまま時々断信号出
力端子２１より時々断信号として出力される。 The line to be measured is a balanced pair cable, connecting terminals 1, 2 and 3, 4 are connected to matching terminating resistors 5, 6 and 5', 6', and the transmission line is non-reflective and is connected to the ground. is in good equilibrium. The input impedances of the unbalanced voltage detector 8 and the comparison circuits 10 to 13 are sufficiently high and do not affect the matching of the line under test and the balance with respect to the ground. In this state, the signal generator 7 sends a sine wave signal or a DC signal with a constant frequency of 0 between the line under test and the ground. When the line under test is in a balanced state and no impulsive noise is generated in the line under test due to crosstalk or the like, the output signal of the unbalanced voltage detector 8 is not output. In this state, it is assumed that disconnection occurs occasionally at point P due to incomplete contact of the conductor connection. Sometimes, at the moment of a disconnection, the line under test loses its balance with respect to the ground, so that an output signal appears on the unbalanced voltage detector 8. At this time, the output signal control section 9 outputs an in-phase signal from the signal generator 7 to the lines L 1 and L 2 to be measured at an appropriate level (for example, the signal generator 7 sends out in-phase signals to the lines L 1 and L 2 under test, and detects the unbalanced voltage using a differential amplifier. In the case of the method, the common mode rejection ratio of the differential amplifier is
40dB, unbalanced voltage detector When the minimum level is 10mV, the positive and negative comparison level signals set to a level of 1V or more are connected to the comparison circuit by the positive and negative comparison level signal input terminals 14 and 15, respectively. 10~
13. This positive and negative comparison level,
Comparing circuits 10 to 13 compare the core wire ground voltage inputted from the connection terminals 1 and 2, and when the core wire ground voltage exceeds the comparison level, a signal is output from the comparison circuit. If a disconnection occurs occasionally at point P, the ground voltage at communication cable connection terminal 1 increases. If this ground-to-ground voltage exceeds a comparison level set to an appropriate value, an output signal appears from the comparison circuit 11 or 13, but since there is no change in the ground-to-ground voltage at the communication cable connection terminal 2, the comparison circuit 10 and 1
1, or the output signals from comparison circuits 12 and 13 do not appear at the same time. Therefore, the output signal of AND circuit 16 or 17 is not output. Therefore, since the output suppression signal is not output from the output suppression signal generation circuit, the output signal of the unbalanced voltage detector 8 is output as an occasional disconnection signal from the output terminal 21 via the output control circuit 20 as it is. Ru.
一方、被測定回線に時々断がなく、かつ漏話等
により、ある一定レベル以上のインパルス性雑音
が発生した場合、不平衡電圧検出器８に、被測定
回線の大地に対する平衡が失われたかのように、
出力信号が現われる。このとき、出力信号制御部
９においては、比較回路１０〜１３で、適当なレ
ベルに設定された比較レベル信号と、インパルス
性雑音信号とが比較される。このインパルス性雑
音の心線大地間電圧は漏話等により被測定回線に
生ずるので、その大きさ、波形および発生時間が
同一である。このため比較回路１０と１１または
比較回路１２と１３から出力信号が同時に出力さ
れる。したがつてAND回路１６または１７に出
力信号が出力され、OR回路１８から出力信号が
出力される。このOR回路１８の出力信号によ
り、出力抑制信号発生回路１９より出力抑制信号
が出力され、出力制御回路２０において、不平衡
電圧検出器８の出力信号が抑制され、時々断信号
出力端子２１に時々断信号が出力されない。 On the other hand, if the line under test is uninterrupted from time to time and impulsive noise of a certain level or higher occurs due to crosstalk, etc., the unbalanced voltage detector 8 will detect a signal as if the line under test had lost its balance with the ground. ,
An output signal appears. At this time, in the output signal control unit 9, the comparison circuits 10 to 13 compare the comparison level signal set to an appropriate level with the impulsive noise signal. Since the wire-to-ground voltage of this impulsive noise is generated in the line under test due to crosstalk or the like, its magnitude, waveform, and generation time are the same. Therefore, output signals from comparison circuits 10 and 11 or comparison circuits 12 and 13 are output simultaneously. Therefore, an output signal is output to the AND circuit 16 or 17, and an output signal is output from the OR circuit 18. In response to the output signal of the OR circuit 18, an output suppression signal is output from the output suppression signal generation circuit 19, and the output signal of the unbalanced voltage detector 8 is suppressed in the output control circuit 20. No disconnection signal is output.
このようにして、漏話等により発生したインパ
ルス性雑音による不平衡電圧検出器の出力信号を
抑制し、被測定回線に発生した時々断のみを検出
することができる。 In this way, it is possible to suppress the output signal of the unbalanced voltage detector due to impulsive noise caused by crosstalk or the like, and to detect only occasional interruptions occurring in the line under test.
上記構成では、被測定回線に一定周波数の信号
または直流信号を、被測定回線と大地との間に送
出して、被測定回線の対地不平衡電圧を検出する
ものを述べたが、被測定回線が現用回線の場合に
おいても、心線大地間電圧を検出し、インパルス
性雑音による不平衡電圧検出器の出力信号を抑制
することにより、同様に被測定回線に発生した
時々断のみを、伝送信号の送端または受端のどち
らにおいても測定することができる。 In the above configuration, a constant frequency signal or DC signal is sent to the line under test between the line under test and the ground to detect the unbalanced voltage to the ground on the line under test. Even in the case of a working line, by detecting the core wire ground voltage and suppressing the output signal of the unbalanced voltage detector due to impulsive noise, only the occasional disconnection that occurs in the line under test can be detected as a transmission signal. It can be measured either at the sending or receiving end.
また、出力信号制御部の機能を応用して、漏話
等により被測定回線に発生したインパルス性雑音
を、時々断と分離して測定することもできる。 Furthermore, by applying the function of the output signal control section, it is also possible to separate and measure impulsive noise generated in the line under test due to crosstalk or the like from occasional interruptions.
以上説明したように、本発明によれば、被測定
ケーブル回線の接点もしくは心線接続部の不完全
接触により発生した時々断のみを的確に測定する
ことができる。 As described above, according to the present invention, it is possible to accurately measure only the occasional disconnection caused by incomplete contact of the contact point or core wire connection part of the cable line to be measured.
また、本発明装置はデイジタル網構成に伴なう
通信回線時々断の分析調査においても極めて有効
かつ効果的なものである。 Furthermore, the device of the present invention is extremely useful and effective in analyzing and investigating occasional communication line disconnections associated with digital network configurations.
図は本発明の実施例装置のブロツク回路図であ
る。
１〜４……通信ケーブル回線の接続端子、５〜
６……回線インピーダンス整合用終端抵抗、７…
…信号発生器、８……不平衡電圧検出器、９……
出力信号制御部、１０〜１３……比較回路、１４
……正の比較レベル信号入力端子、１５……負の
比較レベル信号入力端子、１６〜１７……AND
回路、１８……OR回路、１９……出力抑制信号
発生回路、２０…出力制御回路、２１……時々断
信号出力端子。
The figure is a block circuit diagram of an embodiment of the present invention. 1~4... Communication cable line connection terminal, 5~
6...Terminal resistor for line impedance matching, 7...
...Signal generator, 8...Unbalanced voltage detector, 9...
Output signal control section, 10 to 13... Comparison circuit, 14
...Positive comparison level signal input terminal, 15...Negative comparison level signal input terminal, 16-17...AND
Circuit, 18...OR circuit, 19...Output suppression signal generation circuit, 20...Output control circuit, 21...Sometimes disconnection signal output terminal.
Claims (1)
の信号または直流信号を送出する信号発生器と、
上記被測定回線の心線間の電圧を検出する不平衡
電圧検出器と、上記被測定回線のそれぞれの心線
大地間電圧を検出し、漏話等により被測定回線に
発生したインパルス性雑音による不平衡電圧検出
器の出力信号を抑制する出力信号制御部とを備
え、インパルス性雑音発生時には、それによる不
平衡電圧検出器の出力信号を抑制し、一方、被測
定回線に含まれる接点もしくは心線接続部の不完
全接触による時々断発生時に生ずる不平衡電圧出
力信号はそのまま出力することにより、純粋な
時々断のみを検出することを特徴とする通信ケー
ブル回線時々断監視装置。1. A signal generator that sends a constant frequency signal or DC signal between a pair of lines under test and the ground;
An unbalanced voltage detector detects the voltage between the cores of the line under test, and detects the voltage between each core wire and ground of the line under test. and an output signal control unit that suppresses the output signal of the balanced voltage detector, and suppresses the output signal of the unbalanced voltage detector when impulsive noise occurs, while controlling the contact or core wire included in the line under test. A communications cable line occasional disconnection monitoring device characterized in that it detects only pure occasional disconnections by outputting an unbalanced voltage output signal that occurs when occasional disconnections occur due to incomplete contact at a connection part.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP16523880A JPS5789338A (en) | 1980-11-26 | 1980-11-26 | Monitor device for intermittent disconnection of communication cable line |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP16523880A JPS5789338A (en) | 1980-11-26 | 1980-11-26 | Monitor device for intermittent disconnection of communication cable line |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS5789338A JPS5789338A (en) | 1982-06-03 |
| JPS6132854B2 true JPS6132854B2 (en) | 1986-07-30 |
Family
ID=15808482
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP16523880A Granted JPS5789338A (en) | 1980-11-26 | 1980-11-26 | Monitor device for intermittent disconnection of communication cable line |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS5789338A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH02132163U (en) * | 1989-04-10 | 1990-11-02 |
-
1980
- 1980-11-26 JP JP16523880A patent/JPS5789338A/en active Granted
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH02132163U (en) * | 1989-04-10 | 1990-11-02 |
Also Published As
| Publication number | Publication date |
|---|---|
| JPS5789338A (en) | 1982-06-03 |
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