JPS63261932A - Fault point location system - Google Patents
Fault point location systemInfo
- Publication number
- JPS63261932A JPS63261932A JP62095267A JP9526787A JPS63261932A JP S63261932 A JPS63261932 A JP S63261932A JP 62095267 A JP62095267 A JP 62095267A JP 9526787 A JP9526787 A JP 9526787A JP S63261932 A JPS63261932 A JP S63261932A
- Authority
- JP
- Japan
- Prior art keywords
- reference bit
- fault
- time
- fault point
- distance
- 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.)
- Granted
Links
- 230000005540 biological transmission Effects 0.000 claims abstract description 29
- 238000000034 method Methods 0.000 claims description 15
- 239000013307 optical fiber Substances 0.000 abstract description 8
- 230000001902 propagating effect Effects 0.000 abstract 1
- 239000000835 fiber Substances 0.000 description 6
- 238000010586 diagram Methods 0.000 description 4
- 238000001028 reflection method Methods 0.000 description 4
- 230000003287 optical effect Effects 0.000 description 3
- 238000004891 communication Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 101150069344 CUT1 gene Proteins 0.000 description 1
- 230000007774 longterm Effects 0.000 description 1
- 230000001404 mediated effect Effects 0.000 description 1
- 230000002123 temporal effect Effects 0.000 description 1
Landscapes
- Dc Digital Transmission (AREA)
- Monitoring And Testing Of Transmission In General (AREA)
Abstract
Description
【発明の詳細な説明】
〔産業上の利用分野〕
この発明はディジタル伝送方式における伝送路の障害点
探索に関し、特に光フアイバ海底ケーブルの障害点を標
定する障害点標定方式に関するものである。DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to searching for a fault point in a transmission line in a digital transmission system, and particularly relates to a fault point locating method for locating a fault point in an optical fiber submarine cable.
従来、この種の障害点標定方式は海底ケーブルの切断時
には例えば国際通信の研究Ｎｎ１０９に記載されている
ように、給電線を媒介したパルス反射法、電流電圧法、
静電容量法などが提案されているほか、例えば「光通信
の実用技術」（産報出版発行）に記載されている光パル
ス反射法、あるいは通報研資料（Ｃ３８０−１０”）に
記載されている介在ファイバキャッチボール法などが提
案されていた。Conventionally, this type of fault point locating method has been used when disconnecting submarine cables, for example, as described in International Communication Research Nn109, pulse reflection method, current voltage method,
In addition to the capacitance method that has been proposed, for example, the optical pulse reflection method described in ``Practical Technology of Optical Communication'' (published by Sanpo Publishing) or the The intervening fiber catchball method has been proposed.
上述した従来の障害点標定方式は、特に給電線を媒介し
たパルス反射法は海底ケーブルが切断された時、すなわ
ち給電線が切断された場合のみ有効で１、光パルス反射
法は第１中継器より遠方の光ファイバにおける障害探索
は不可能であり、介在ファイバキャッチボール法は主信
号系ファイバのみの障害に対応できなく、介在ファイバ
のため価格上昇になる々どの欠点がある。The above-mentioned conventional fault point locating methods, especially the pulse reflection method mediated by the power supply line, are effective only when the submarine cable is cut, that is, the power supply line is cut1, and the optical pulse reflection method is effective only when the power supply line is disconnected. It is impossible to search for faults in optical fibers farther away, and the intervening fiber catchball method cannot deal with faults only in the main signal fiber, and has the drawbacks that the cost increases due to the intervening fibers.
この発明の障害点標定方式は、−往復伝搬時間毎に基準
ビットを送出し、この基準ビットによって区切られた伝
送信号を受信して記憶し、伝送路に障害が発生したとき
両端局の受信器に記憶された伝送信号の基準ビットの受
信時から障害発生までの各々の遅延時間を比較すること
により、両端局から障害までの距離を算出するものであ
る。The fault location method of the present invention includes: - transmitting a reference bit every round trip propagation time, receiving and storing transmission signals delimited by the reference bit, and transmitting a reference bit at each end station when a fault occurs in the transmission path The distance from both terminal stations to the fault is calculated by comparing the respective delay times from the time of reception of the reference bits of the transmission signal stored in the terminals to the occurrence of the fault.
この発明は中継点を含む光フアイバ伝送路の障害点の距
離を標定することができる。The present invention can locate the distance of a fault point in an optical fiber transmission line including a relay point.
第１図はこの発明に係る障害点標定方式の一実施例を示
すシステム構成図である。同図において、１および２は
端局装置の送信部および受信部、３および４は伝送路を
構成する光フアイバ線路および中継器、５はその出力端
子５ｂが送信部１に接続され伝送信号に対し伝送路の一
往復伝搬時間毎にパルスを挿入または消去し基準ビット
を位置づける送信器、６はその入力端子６１が受信部２
に接続され基準ビットの判定および伝送信号の記憶機能
を有する受信器、Ｔは送信器５の入力端子５ａと受信器
６の出力端子６ｂとの間に接続され受信した基準ビット
と送信する基準ビットのタイミング制御を行なうタイミ
ング制御器である。なお、第２図は第１図に示す障害点
標定方式を説明するため、伝送信号と基準ピッ）Ｐｓの
時間的関係を示す図であシ、８はＡ端局、９はＢ端局、
Ｆは障害点、実線で示す矢印Ｅは基準ピッ）Ｐｇの軌跡
、では伝送路片道の伝播時間を示す。ＴａおよびＴｂは
データが断となる時間、ｔｌおよびｔｂは時間ＴＩＬ。FIG. 1 is a system configuration diagram showing an embodiment of the fault point locating method according to the present invention. In the figure, 1 and 2 are the transmitter and receiver of the terminal equipment, 3 and 4 are the optical fiber lines and repeaters that constitute the transmission path, and 5 is the output terminal 5b of which is connected to the transmitter 1 and is connected to the transmission signal. On the other hand, 6 is a transmitter that inserts or deletes a pulse every round-trip propagation time of the transmission path and positions the reference bit, and 6 is a transmitter whose input terminal 61 is connected to the receiver 2.
T is connected between the input terminal 5a of the transmitter 5 and the output terminal 6b of the receiver 6, and is connected to the receiver having the function of determining the reference bit and storing the transmitted signal. This is a timing controller that performs timing control. In addition, in order to explain the failure point locating method shown in FIG. 1, FIG. 2 is a diagram showing the temporal relationship between the transmission signal and the reference pitch (Ps), 8 is the A terminal station, 9 is the B terminal station,
F indicates a failure point, and arrow E shown by a solid line indicates the locus of the reference pin (Pg), which indicates the propagation time for one-way transmission path. Ta and Tb are times when data is disconnected, and tl and tb are times TIL.
Ｔｂと基準ピッ）Ｐｓの時間差である。This is the time difference between Tb and the reference pitch Ps.
次に上記構成による障害点標定方式の動作について第２
図を参照して説明する。まず、端局の送信部の送信器か
ら伝送路の一往復伝搬時間毎に基準ビットを送出し、受
信部の受信器はこの基準ビットで区切られた伝送信号を
受信する。そして伝送路に障害が発生したとき、その障
害発生により伝送信号がそれぞれＴａ点およびＴｂ点で
断になったとすると、その障害点は障害発生データＴａ
点およびＴｂ点より基準ピッ）Ｐｓの軌跡に平行な破線
を引いたときその交点下となる。このとき、Ａ端局から
障害点までの遅延時間Ｔｎ（ｓｅｃ）はＴｐ＝（２Ｔ＋
ｔａ−ｔｂ ）÷２
となシ、Ｂ端局から障害点までの距離Ｄ（に）はＤ＝（
ｔｂ−ｔａ）÷２
となる。したがって、この時間を光フアイバ伝搬時間（
約４，７μＳａｄ／、 ’）で割算することにより距離
を算出することができる。Next, we will discuss the operation of the fault point locating method with the above configuration in the second section.
This will be explained with reference to the figures. First, a reference bit is sent from a transmitter in a transmitting section of a terminal station every round-trip propagation time on a transmission path, and a receiver in a receiving section receives a transmission signal separated by the reference bits. When a fault occurs in the transmission path, if the transmission signal is cut off at point Ta and point Tb, the fault point is the fault occurrence data Ta.
When a broken line parallel to the locus of the reference pitch Ps is drawn from the point Tb and the point Tb, the point is below the intersection. At this time, the delay time Tn (sec) from the A terminal to the failure point is Tp=(2T+
ta-tb ) ÷ 2 The distance D from the B terminal station to the failure point is D = (
tb-ta)÷2. Therefore, this time is equal to the fiber propagation time (
The distance can be calculated by dividing by approximately 4.7 μSad/, ').
なお、上述の説明では基準ビットを独立に用いたが、こ
れに限定せず、伝送信号以外の、例えばフレームパルス
、サービスパルスナトの一部ニ設定し、伝送容量を減少
しないように用いてもよいことはもちろんである。Note that in the above explanation, the reference bits are used independently, but the reference bits are not limited to this, and may also be used in other than the transmission signal, such as part of the frame pulse or service pulse, so as not to reduce the transmission capacity. Of course it's a good thing.
以上詳細に説明したように、この発明に係る障害点標定
方式によれば、基準ビットを設定し障害時に記憶した両
端局の受信信号の遅延時間差を基準ビットを基に算出し
、光ファイバの単位長当シの伝搬時間で割算することく
より、中継器を含む光フアイバ伝送路の障害点の距離を
標定することができる効果がある。As explained in detail above, according to the fault location method according to the present invention, a reference bit is set and the delay time difference between received signals of both end stations stored at the time of a fault is calculated based on the reference bit, and This method has the advantage that it is possible to locate the distance of a fault point in an optical fiber transmission line including a repeater, rather than dividing by the long-term propagation time.
第１図はこの発明に係る障害点標定方式の一実施例を示
すシステム構成図、第２図は第１図の動作を説明するた
めの障害点までの距離を標定する図である。
１ΦΦ・拳送信部、２・・・拳受信部、３＠・・・ファ
イバ線路、４・・・参中継型、５・・・・送信器、６・
・・・受信器、Ｔ・・・・タイミング制御器、８・・・
・Ａ端局、９・争・・Ｂ端局。FIG. 1 is a system configuration diagram showing an embodiment of the fault point locating method according to the present invention, and FIG. 2 is a diagram for locating the distance to the fault point to explain the operation of FIG. 1. 1ΦΦ・Fist transmitter, 2...Fist receiver, [email protected] line, 4...Relay type, 5...Transmitter, 6...
...Receiver, T...Timing controller, 8...
・Terminal A, 9・Contest・Terminal B.
Claims (1)
出し、この基準ビットで区切られた伝送信号を受信器で
受信し、伝送路に障害が発生したとき、両端局の受信器
に記憶された伝送信号の基準ビットの受信時から障害発
生までの各々の遅延時間を比較して両端局から障害点ま
での距離を算出することを特徴とする障害点標定方式。A reference bit is sent from the transmitter for each round-trip propagation time of the transmission path, and the transmission signal separated by this reference bit is received by the receiver, and when a failure occurs on the transmission path, it is stored in the receivers at both end stations. A fault point locating method is characterized in that the distance from both terminal stations to the fault point is calculated by comparing the respective delay times from the reception of reference bits of the transmitted signal to the occurrence of the fault.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP9526787A JP2674748B2 (en) | 1987-04-20 | 1987-04-20 | Fault location method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP9526787A JP2674748B2 (en) | 1987-04-20 | 1987-04-20 | Fault location method |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS63261932A true JPS63261932A (en) | 1988-10-28 |
| JP2674748B2 JP2674748B2 (en) | 1997-11-12 |
Family
ID=14132990
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP9526787A Expired - Lifetime JP2674748B2 (en) | 1987-04-20 | 1987-04-20 | Fault location method |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP2674748B2 (en) |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS55129770A (en) * | 1979-03-29 | 1980-10-07 | Kokusai Denshin Denwa Co Ltd <Kdd> | Detecting method for cable failure position |
| JPS589039A (en) * | 1981-07-10 | 1983-01-19 | Fujitsu Ltd | Monitoring system for optical transmission line |
-
1987
- 1987-04-20 JP JP9526787A patent/JP2674748B2/en not_active Expired - Lifetime
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS55129770A (en) * | 1979-03-29 | 1980-10-07 | Kokusai Denshin Denwa Co Ltd <Kdd> | Detecting method for cable failure position |
| JPS589039A (en) * | 1981-07-10 | 1983-01-19 | Fujitsu Ltd | Monitoring system for optical transmission line |
Also Published As
| Publication number | Publication date |
|---|---|
| JP2674748B2 (en) | 1997-11-12 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| A02 | Decision of refusal |
Free format text: JAPANESE INTERMEDIATE CODE: A02 Effective date: 19960709 |