JP3090083B2 - Fault monitoring system - Google Patents
Fault monitoring systemInfo
- Publication number
- JP3090083B2 JP3090083B2 JP8967897A JP8967897A JP3090083B2 JP 3090083 B2 JP3090083 B2 JP 3090083B2 JP 8967897 A JP8967897 A JP 8967897A JP 8967897 A JP8967897 A JP 8967897A JP 3090083 B2 JP3090083 B2 JP 3090083B2
- Authority
- JP
- Japan
- Prior art keywords
- monitoring
- signal
- station
- optical
- fault
- 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 - Fee Related
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- Monitoring And Testing Of Transmission In General (AREA)
- Optical Communication System (AREA)
Description
【0001】[0001]
【発明の属する技術分野】本発明は障害の種類の識別や
障害の箇所の特定を行うための障害監視システムに係わ
り、特にパッシブダブルスターシステムで障害の要因が
どこにあるかのかを親局側で監視するようにした障害監
視システムに関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a fault monitoring system for identifying a type of a fault and specifying a location of the fault. In particular, in a passive double star system, a master station determines where the cause of the fault is. The present invention relates to a fault monitoring system to be monitored.
【0002】[0002]
【従来の技術】図2は、従来のパッシブダブルスターシ
ステムを表わしたものである。このパッシブダブルスタ
ーシステムでは、監視制御装置101を付属させた親局
(COT)102と複数の子局1031 〜103N が、
途中に光スプリッタ104を配置した主信号伝達用の光
伝送路で接続された構成となっている。親局102内に
は、光信号と電気信号の相互変換を行うための電気/光
ならびに光/電気変換部(以下E/O・O/E変換部と
いう。)105と、上りバースト信号の検出を行うため
の上りバースト信号検出部106が配置されている。ま
た、個々の子局(ONU)1031 〜103N には、光
信号と電気信号の相互変換を行うためのE/O・O/E
変換部108がそれぞれ配置されている。2. Description of the Related Art FIG. 2 shows a conventional passive double star system. In this passive double star system, a master station (COT) 102 to which a monitoring control device 101 is attached and a plurality of slave stations 103 1 to 103 N are provided.
It is configured to be connected by an optical transmission line for transmitting a main signal in which an optical splitter 104 is arranged in the middle. In the master station 102, an electrical / optical and optical / electrical converter (hereinafter referred to as an E / O / O / E converter) 105 for performing mutual conversion between an optical signal and an electrical signal, and detection of an uplink burst signal. An upstream burst signal detector 106 for performing the above operation is arranged. Each of the ONUs 103 1 to 103 N has an E / O / O / E for performing mutual conversion between an optical signal and an electric signal.
The conversion units 108 are arranged.
【0003】このようなシステムで、例えば第Nの子局
103N のE/O・O/E変換部108から出力される
上りバースト信号は、光スプリッタ104を経由して親
局102に到達し、そのE/O・O/E変換部105で
受信されて光−電気変換される。この変換後の電気信号
は主信号111として図示しない回路部分に供給される
他、上りバースト信号検出部106に入力される。上り
バースト信号検出部106では、終端およびバースト信
号についての断検出を行い、断検出時には断検出信号1
12を監視制御装置101に送出する。In such a system, for example, an upstream burst signal output from the E / O / O / E converter 108 of the Nth slave station 103 N reaches the master station 102 via the optical splitter 104. Is received by the E / O / O / E conversion unit 105 and is subjected to optical-electrical conversion. The converted electric signal is supplied to a circuit portion (not shown) as a main signal 111 and is also input to an upstream burst signal detecting section 106. The upstream burst signal detection unit 106 detects a disconnection of the termination and the burst signal.
12 is sent to the monitoring control device 101.
【0004】ところで、ループ型光伝送システムに対し
て波長多重を利用し、監視光のループバック光によって
障害の区間を検出する技術として、特開平3−1876
33号公報に開示された技術が存在する。この公報に開
示された技術では、主信号の波長とは異なった波長を監
視用光信号として割り当てている。そしてこの監視用光
信号を、主信号に多重し、トポロジがループであること
を利用して、挿入箇所からループを一巡して再び挿入箇
所に戻ってくる帰還光の断検出を行うことによって、障
害の有無を監視している。なお、特開平5−29203
8号公報にも、主信号と監視用の監視信号光を合波する
技術が開示されている。Japanese Patent Application Laid-Open No. Hei 3-1876 discloses a technique of utilizing wavelength multiplexing for a loop type optical transmission system and detecting a faulty section by using loopback light of monitoring light.
There is a technique disclosed in JP-A-33-33. In the technique disclosed in this publication, a wavelength different from the wavelength of the main signal is assigned as a monitoring optical signal. Then, by multiplexing the monitoring optical signal with the main signal and utilizing the fact that the topology is a loop, by detecting the return light returning from the insertion point to the loop again by looping around the loop, Monitors for failures. Incidentally, Japanese Patent Application Laid-Open No. 5-29203
No. 8 also discloses a technique for multiplexing a main signal and a monitoring signal light for monitoring.
【0005】[0005]
【発明が解決しようとする課題】ところで、図2に示し
た光伝送システムは、光スプリッタ104によってスタ
ー型に分岐したトポロジとなっている。したがって、提
案の障害監視システムを図2に示す光伝送システムに適
用しようとすると、伝送システムの帰還ループが子局1
031 〜103N ごとに必要となり、技術のそのままの
適用ができないという問題があった。すなわち、特開平
3−187633号公報に開示されたような従来の障害
監視システムでは、親局102側が特定の子局103か
らのバースト信号を受信しないような場合、障害の種類
の識別を行ったり、障害箇所の特定を親局102側で行
うことができなかった。ここで障害箇所の特定とは、障
害の要因が光スプリッタ104と子局1031 〜103
N のうちの該当するものとの間の伝送路に存在するの
か、あるいは該当する子局103の装置自体の合分波部
以外の部分に存在するかといった切り分けをいう。By the way, the optical transmission system shown in FIG. 2 has a topology in which the optical splitter 104 branches into a star type. Therefore, when the proposed fault monitoring system is applied to the optical transmission system shown in FIG.
It is necessary for every 03 1 to 103 N , and there is a problem that the technology cannot be applied as it is. That is, in the conventional fault monitoring system disclosed in JP-A-3-187633, when the master station 102 does not receive a burst signal from a specific slave station 103, the type of fault is identified. However, the failure point cannot be specified on the master station 102 side. Here, the identification of the failure location means that the cause of the failure is the optical splitter 104 and the slave stations 103 1 to 103.
This means whether the N exists in the transmission path between the corresponding station and the corresponding station, or whether it exists in a portion other than the multiplexing / demultiplexing unit of the device of the slave station 103 itself.
【0006】そこで本発明の目的は、特定の子局からの
光信号が親局側で未受信の場合に、障害区間の切り分け
を親局側で行うことのできる障害監視システムを提供す
ることにある。SUMMARY OF THE INVENTION It is an object of the present invention to provide a fault monitoring system in which, when an optical signal from a specific slave station has not been received by the master station, a fault section can be separated by the master station. is there.
【0007】[0007]
【課題を解決するための手段】請求項1記載の発明で
は、(イ)受信した光信号から主信号と波長が異なりか
つ自局専用の波長が割り当てられた監視用光信号を分離
してこの自局専用の監視用光信号をそのまま折り返すよ
うに主信号に波長多重して出力する複数の子局と、
(ロ)これら複数の子局をスター状に接続した光スプリ
ッタと、(ハ)この光スプリッタを介して複数の子局と
接続されこれらの子局から送られてきた光信号から主信
号と監視用光信号を分離する分波手段と、この分波手段
で分離された主信号の断を検出する上り主信号断検出手
段と、分波手段で分離された複数の子局の監視用光信号
の個別の断を検出する監視用光信号断検出手段と、これ
ら複数の子局の監視用光信号を発生して主信号に合波し
て光スプリッタを経由してそれぞれの子局に送出する信
号送出手段と、主信号断検出手段と監視用光信号断検出
手段の検出結果を入力して、これらの断検出の組合せに
よって光スプリッタと特定の子局との間に障害が発生し
ているか特定の子局で主信号と監視用信号の合波および
分波を行う箇所以外の箇所で障害が発生しているかの判
別を行う監視判別手段とを備えた親局とを障害監視シス
テムに具備させる。According to the first aspect of the present invention, (a) a monitoring optical signal having a wavelength different from that of the main signal and assigned to a wavelength dedicated to the own station is separated from the received optical signal, and A plurality of slave stations for wavelength-multiplexing and outputting the main signal so that the monitoring optical signal dedicated to the own station is returned as it is,
(B) an optical splitter in which the plurality of slave stations are connected in a star configuration; and (c) a main signal and a monitor based on the optical signals connected to the plurality of slave stations via the optical splitter and transmitted from the slave stations. Demultiplexing means for separating optical signals for use, upstream main signal disconnection detecting means for detecting disconnection of the main signal separated by the demultiplexing means, and monitoring optical signals of a plurality of slave stations separated by the demultiplexing means Monitoring optical signal disconnection detecting means for detecting an individual disconnection of a plurality of slave stations, generating monitoring optical signals of the plurality of slave stations, multiplexing them with a main signal, and transmitting the multiplexed signals to the respective slave stations via an optical splitter. Inputting the detection results of the signal transmitting means, the main signal disconnection detecting means and the monitoring optical signal disconnection detecting means, and determining whether a failure has occurred between the optical splitter and a specific slave station by a combination of these disconnection detections From the point where the main signal and the monitoring signal are multiplexed and demultiplexed at a specific slave station Failure location is to be provided to the fault monitoring system and a master station and a monitoring determination unit which performs one of determination has occurred.
【0008】すなわち請求項1記載の発明では、親局と
複数の子局とが光スプリッタを介してスター状に接続さ
れた光通信システムにおいて、それぞれの子局に主信号
と波長が異なり、かつそれぞれの子局が独自の波長に設
定された監視用光信号を割り当てている。また、これら
複数の子局は、自局の監視用光信号を自局でそのまま折
り返し(ループバックし)、主信号に多重して光スプリ
ッタを介し親局に送出するようにしている。親局では、
これら子局用の監視用光信号を送出する一方、これら子
局から送られてくる主信号の断を検出する主信号断検出
手段と各波長の監視用光信号の断を検出する監視用光信
号断検出手段を用意しており、これらの検出結果を監視
判別手段に出力して、ここで光スプリッタと特定の子局
との間に障害が発生しているか特定の子局で主信号と監
視用信号の合波および分波を行う箇所以外の箇所で障害
が発生しているかの判別を行わせることにしている。監
視判別手段および主信号断検出手段ならびに監視用光信
号断検出手段は、物理的に親局内に配置されていてもよ
いし、親局に外部接続されるような形で実質的に親局と
一体的に配置されているようなものであってもよい。That is, according to the first aspect of the present invention, in an optical communication system in which a master station and a plurality of slave stations are connected in a star via an optical splitter, each slave station has a different main signal and wavelength. Each slave station assigns a monitoring optical signal set to a unique wavelength. Further, the plurality of slave stations return the monitoring optical signal of the own station as it is (loop back), multiplex it with the main signal, and transmit the multiplexed signal to the master station via the optical splitter. At the master station,
While transmitting the monitoring optical signal for these slave stations, the main signal disconnection detecting means for detecting the disconnection of the main signal sent from these slave stations and the monitoring light for detecting the disconnection of the monitoring optical signal of each wavelength. Signal disconnection detection means is provided, and these detection results are output to the monitoring determination means, where a failure has occurred between the optical splitter and the specific slave station or whether the specific slave station has a main signal. It is determined whether a failure has occurred at a location other than the location where the monitoring signal is multiplexed and demultiplexed. The monitoring determination means and the main signal loss detection means and the monitoring optical signal loss detection means may be physically located in the master station, or may be substantially connected to the master station in such a way as to be externally connected to the master station. It may be such that they are arranged integrally.
【0009】請求項2記載の発明では、請求項1記載の
発明で、複数の子局は、それぞれ自局で分離した自局専
用の波長の割り当てられた監視用光信号を自局のループ
バック用光導波路を経由して自局内で主信号と多重し光
スプリッタを経由して親局に送出することを特徴として
いる。自局用に割り当てられた監視用光信号を確実に親
局側に返送できることが、障害の箇所の切り分けに必要
な要件となる。According to a second aspect of the present invention, in the first aspect of the present invention, the plurality of slave stations loop back a monitoring optical signal to which a wavelength dedicated to the own station, which is separated by the own station, is allocated. It is characterized in that it is multiplexed with the main signal in its own station via the optical waveguide for use and transmitted to the master station via the optical splitter. The ability to reliably return the monitoring optical signal assigned to its own station to the master station is a necessary requirement for isolating the location of the fault.
【0010】請求項3記載の発明では、請求項1記載の
発明で、監視判別手段は、監視用光信号断検出手段が特
定の子局の監視用光信号のみを未検出で他の子局の監視
用光信号を検出しているときは、光スプリッタとその特
定の子局との間の伝送路に障害が発生していると判別す
ることを特徴としている。他の子局の監視用光信号を検
出していれば、少なくとも親局と光スプリッタの間の伝
送路に障害が発生していないことになるからである。According to a third aspect of the present invention, in the first aspect of the present invention, the monitoring determining means is configured such that the monitoring optical signal disconnection detecting means does not detect only the monitoring optical signal of the specific slave station and the other slave stations. When the monitoring optical signal is detected, it is determined that a failure has occurred in the transmission path between the optical splitter and the specific slave station. This is because if a monitoring optical signal of another slave station is detected, at least a failure has not occurred in the transmission path between the master station and the optical splitter.
【0011】請求項4記載の発明では、請求項1記載の
発明で、監視判別手段は、主信号断検出手段が特定の子
局の主信号のみ未検出で監視用光信号断検出手段がその
特定の子局の監視用光信号を検出しているとき、その特
定の子局内に障害が発生していると判別することを特徴
としている。監視用光信号は自局の装置内で単純に折り
返すだけなので、監視用光信号が検出されて主信号が検
出されない子局が存在すれば、その子局内部に障害が発
生していると判別できるからである。ただし、その子局
における主信号と監視用信号の合波および分波を行う箇
所に障害が発生した場合には、監視用光信号がその子局
内で折り返されない事態が発生する場合がある。このよ
うな場合には、障害の切り分けに限界が生じる。According to a fourth aspect of the present invention, in the first aspect of the present invention, the main signal disconnection detecting means has not detected only the main signal of a specific slave station and the monitoring optical signal disconnection detecting means has the main signal disconnection detecting means. When a monitoring optical signal of a specific slave station is detected, it is determined that a failure has occurred in the specific slave station. Since the monitoring optical signal is simply folded back in its own device, if there is a slave station where the monitoring optical signal is detected and the main signal is not detected, it can be determined that a fault has occurred inside the slave station. Because. However, if a failure occurs at a location where the main signal and the monitoring signal are multiplexed and demultiplexed in the slave station, a situation may occur in which the monitoring optical signal is not looped back in the slave station. In such a case, there is a limit to the fault isolation.
【0012】請求項5記載の発明では、請求項1記載の
発明で、親局は、複数の子局のそれぞれに監視用信号光
として割り当てた波長の監視用信号光を選択的に出力す
る監視用信号光選択的出力手段を備えており、監視用光
信号断検出手段は、監視用信号光選択的出力手段の選択
的出力に同期してその出力される波長と同一の波長の監
視用信号光が対応する子局から返送されてきたかどうか
の判別を行うことでそれぞれの子局に割り当てられた監
視用信号光の断検出を行うことを特徴としている。この
ような時分割的な処理を行うことで、監視用光信号断検
出手段の波長ごとの判別のための構成を単純化すること
ができる。According to a fifth aspect of the present invention, in the first aspect of the invention, the master station selectively outputs a monitoring signal light having a wavelength allocated to each of the plurality of slave stations as the monitoring signal light. Signal light selective output means, and the monitoring optical signal disconnection detection means, in synchronization with the selective output of the monitoring signal light selective output means, a monitoring signal having the same wavelength as the output wavelength. It is characterized in that it is determined whether or not the light has been returned from the corresponding slave station, thereby detecting disconnection of the monitoring signal light assigned to each slave station. By performing such time-division processing, the configuration for discrimination for each wavelength of the monitoring optical signal disconnection detecting means can be simplified.
【0013】[0013]
【0014】[0014]
【実施例】以下実施例につき本発明を詳細に説明する。DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described in detail below with reference to embodiments.
【0015】図1は本発明の一実施例における障害監視
システムを示したものである。この障害監視システムで
は、監視制御装置11を付属させた親局(COT)12
と複数の子局(ONU)131 〜13N が、途中に光ス
プリッタ14を配置した主信号伝達用の光伝送路で接続
された構成となっている。FIG. 1 shows a fault monitoring system according to an embodiment of the present invention. In this fault monitoring system, a master station (COT) 12 to which a monitoring control device 11 is attached is provided.
And a plurality of slave units (ONUs) 13 1 to 13 N are connected by an optical transmission line for transmitting a main signal, in which an optical splitter 14 is arranged on the way.
【0016】親局12内には、光信号と電気信号の相互
変換を行うための電気/光ならびに光/電気変換部(E
/O・O/E変換部という。)15と、上りバースト信
号の検出を行うための上りバースト信号検出部16と、
線路監視部17とが配置されている。バースト信号検出
部16は、上りバースト信号を終端し、断検出字には断
検出信号41を監視制御装置11に出力するようになっ
ている。In the master station 12, an electrical / optical and optical / electrical conversion unit (E / E) for mutually converting an optical signal and an electrical signal is provided.
It is called an / O · O / E conversion unit. ) 15, an upstream burst signal detector 16 for detecting an upstream burst signal,
A track monitoring unit 17 is provided. The burst signal detector 16 terminates the upstream burst signal, and outputs a disconnection detection signal 41 to the monitoring control device 11 for a disconnection detection character.
【0017】線路監視部17は、主信号18とループバ
ッ光19の合波および分波を行うための合分波部21
と、この合分波部21の出力としてのループバッ光19
を入力して断検出を行うための断検出部22と、ループ
バッ光19における監視の対象となる波長を選択するた
めの波長選択信号24をこの断検出部22ならびに試験
光源部25に供給する線路監視制御部26とを備えてい
る。試験光源部25は、各子局131 〜13N にそれぞ
れ1つずつ対応した波長λ1 〜λN の光源を収容してお
り、ループバック光信号19を合分波部21に供給する
ようになっている。また断検出部22は、線路監視制御
部26から与えられる波長選択信号24によって、波長
λ1 〜λN までの各波長の光の有無による断検出を行
う。The line monitoring section 17 includes a multiplexing / demultiplexing section 21 for multiplexing and demultiplexing the main signal 18 and the loopback light 19.
And a loopback light 19 as an output of the multiplexer / demultiplexer 21.
And a line for supplying a wavelength selection signal 24 for selecting a wavelength to be monitored in the loopback light 19 to the disconnection detecting unit 22 and the test light source unit 25. And a monitoring control unit 26. Test the light source unit 25 accommodates the light source of the wavelength lambda 1 to [lambda] N corresponding one each to each child station 13 1 to 13 N, to provide loop-back optical signal 19 to the demultiplexing unit 21 It has become. In addition, the disconnection detecting unit 22 performs disconnection detection based on the presence or absence of light of each wavelength from the wavelengths λ 1 to λ N in accordance with the wavelength selection signal 24 provided from the line monitoring control unit 26.
【0018】一方、子局131 〜13N は監視のために
供給されるループバック光信号19の波長がそれぞれ異
なるが、それ以外の回路構成は同一となっている。この
図1では簡略のために第Nの子局13N の構成のみを示
している。第Nの子局13Nは、主信号18について光
信号と電気信号の相互変換を行うためのE/O・O/E
変換部31と、線路監視用ループバック部32とから構
成されている。ここで線路監視用ループバック部32
は、主信号18とループバック光信号19の合波および
分波を行うための合分波部33と、波長λN のループバ
ック光信号19用の光導波路34とを備えている。On the other hand, the slave stations 13 1 to 13 N have different wavelengths of the loop-back optical signal 19 supplied for monitoring, but the other circuit configurations are the same. FIG. 1 shows only the configuration of the N-th slave station 13 N for simplification. The N-th slave station 13 N performs E / O · O / E for performing mutual conversion between an optical signal and an electric signal with respect to the main signal 18.
It comprises a converter 31 and a line monitoring loopback unit 32. Here, the line monitoring loopback unit 32
Includes a demultiplexing unit 33 for performing multiplexing and demultiplexing of the main signal 18 and the loop-back optical signal 19, the optical waveguide 34 of the loop-back optical signal 19 with a wavelength lambda N.
【0019】このような障害監視システムで、一例とし
て第Nの子局13N に対する線路監視を考えることにす
る。親局内で線路監視制御部26から出力された波長選
択信号24は試験光源部25に入力される。この波長選
択信号24が波長λN を指示するものである場合、試験
光源部25は波長λN の光信号を出力する。この波長λ
N の光信号は、合分波部21で主信号18と合波され、
光スプリッタ14を介して第Nの子局13N 内の合分波
部33で分波されて光導波路34に入力される。そし
て、ここでループバックされて再度、合分波部33に入
力される。合分波部33ではこの波長λN の光信号を親
局12に向けて送出する主信号18に波長多重する。In such a fault monitoring system, as an example, consider the line monitoring for the Nth slave station 13N . The wavelength selection signal 24 output from the line monitoring control unit 26 in the master station is input to the test light source unit 25. If this wavelength selection signal 24 is an indication of the wavelength lambda N, the test light source unit 25 outputs the optical signal of the wavelength lambda N. This wavelength λ
The N optical signal is multiplexed with the main signal 18 in the multiplexing / demultiplexing unit 21,
The light is split by the multiplexing / demultiplexing unit 33 in the Nth slave station 13 N via the optical splitter 14 and input to the optical waveguide 34. Then, the signal is looped back and input to the multiplexing / demultiplexing unit 33 again. In demultiplexing section 33 wavelength-multiplexed to the main signal 18 to be sent toward the optical signal of the wavelength lambda N to the master station 12.
【0020】親局12は、線路監視部17内の合分波部
21で、主信号18に多重された波長λN のループバッ
ク光信号19を分離し、これを断検出部22に送出す
る。断検出部22では、波長選択信号24の指示によっ
て、波長λN のループバック光信号19の有無を検出
し、その結果を線路監視制御部26に通知する。線路監
視制御部26は、通知された結果を必要に応じて結果信
号42として監視制御装置11に出力することになる。The master station 12 separates the loopback optical signal 19 of wavelength λ N multiplexed on the main signal 18 in the multiplexing / demultiplexing section 21 in the line monitoring section 17 and sends it to the disconnection detecting section 22. . The disconnection detection unit 22, the instruction of wavelength selection signal 24, detects the presence or absence of a loop-back optical signal 19 of wavelength lambda N, and notifies the result to the line monitoring control unit 26. The line monitoring controller 26 outputs the notified result as a result signal 42 to the monitoring controller 11 as necessary.
【0021】今、光スプリッタ14と第Nの子局13N
の間の伝送路で障害が発生したものとする。これによっ
て、他の子局131 〜13N-1 から送られてくるループ
バック光信号19が断検出部22で検出されるにもかか
わらず、第Nの子局13N から送られてくるはずのルー
プバック光信号19が断検出部22で未検出となる。こ
れにより、光スプリッタ14と第Nの子局13N の間の
伝送路で障害が発生したことが認識できることになる。Now, the optical splitter 14 and the N-th slave station 13 N
It is assumed that a failure has occurred in the transmission path between. As a result, the loopback optical signal 19 sent from the other slave stations 13 1 to 13 N−1 is sent from the Nth slave station 13 N even though the disconnection detection unit 22 detects it. The expected loopback optical signal 19 is not detected by the disconnection detection unit 22. Thereby, it is possible to recognize that a failure has occurred in the transmission path between the optical splitter 14 and the N-th slave station 13N .
【0022】次に合分波部33以外の部分で第Nの子局
13N の装置障害が発生した場合を考える。この場合に
は、親局12内のバースト信号検出部16が第Nの子局
13 N からの上りバースト信号の断を検出し、その結果
を監視制御装置11に通知する。この場合には、第Nの
子局13N に対応した波長λN のループバック光信号1
9が親局12の断検出部22で検出することができる。
すなわち、いずれの場合にはもバースト信号検出部16
は第Nの子局13N からの上りバースト信号の断を検出
するが、光スプリッタ14と第Nの子局13N の間の伝
送路で障害が発生した場合には断検出部22が波長λN
のループバック光信号19を検出できないのに対して、
第Nの子局13N 自体に障害が発生した場合には、それ
が合分波部33以外の障害であれば断検出部22は波長
λN のループバック光信号19を検出できることにな
る。Next, in the portions other than the multiplexing / demultiplexing portion 33, the Nth slave station
13NLet us consider a case where a device failure has occurred. In this case
Means that the burst signal detector 16 in the master station 12 is the Nth slave station
13 NOf the upstream burst signal from the
Is notified to the monitoring control device 11. In this case, the Nth
Slave station 13NWavelength λ corresponding toNLoopback optical signal 1
9 can be detected by the disconnection detection unit 22 of the master station 12.
That is, in any case, the burst signal detector 16
Is the Nth child station 13NOf burst burst signal from
However, the optical splitter 14 and the NthNBetween
When a failure occurs in the transmission path, the disconnection detection unit 22 outputs the wavelength λ.N
Cannot detect the loop-back optical signal 19 of
Nth child station 13NIf the failure itself,
Is a failure other than the multiplexing / demultiplexing unit 33, the disconnection detection unit 22
λNCan detect the loopback optical signal 19 of FIG.
You.
【0023】以上の結論をまとめて表にすると次の表1
のようになる。Table 1 summarizes the above conclusions.
become that way.
【表1】 [Table 1]
【0024】したがって、監視制御装置11は障害が発
生した場合にバースト信号検出部16から送られてくる
断検出信号41と線路監視制御部26から送られてくる
結果信号42の双方の信号状態の組合せを認識し、障害
要因が光スプリッタ14と特定の子局13との間の伝
送路にあるのか、その特定の子局13の合分波部33
以外の装置障害であるのかの切り分けを行うことができ
ることになる。もちろん、親局12と光スプリッタ1
4の間の伝送路に障害が存在するかの判別も可能であ
る。Therefore, when a fault occurs, the monitoring and control device 11 checks the signal states of both the disconnection detection signal 41 sent from the burst signal detection unit 16 and the result signal 42 sent from the line monitoring and control unit 26. Recognizing the combination, whether the cause of the failure is in the transmission path between the optical splitter 14 and the specific slave station 13 or not, the multiplexing / demultiplexing unit 33
In other words, it is possible to determine whether the failure is other than the above. Of course, the master station 12 and the optical splitter 1
It is also possible to determine whether a failure exists in the transmission path between the four.
【0025】このように本実施例の障害監視システムで
は、障害の種類の識別と障害箇所の特定あるいは切り分
けを行うことができるので、障害が発生した際の復旧ま
での指示を親局側で各子局あるいは光スプリッタの配置
された箇所まで出向くことなく迅速に行うことができ、
障害復旧までの時間を短縮することができる。これは、
特にパッシブダブルスターシステムのサービスを提供す
る通信業者にとって有益である。As described above, the fault monitoring system according to the present embodiment can identify the type of fault and specify or isolate the fault location. It can be done quickly without going to the location where the slave station or optical splitter is located,
It is possible to shorten the time until the failure recovery. this is,
It is particularly useful for carriers that provide passive double star system services.
【0026】[0026]
【発明の効果】以上説明したように請求項1記載の発明
によれば、親局と複数の子局とが光スプリッタを介して
スター状に接続された光通信システムにおいて、それぞ
れの子局に主信号と波長が異なり、かつそれぞれの子局
が独自の波長に設定された監視用光信号を割り当てるこ
とにしたので、波長の判別を行うだけで親局側は各子局
の障害の有無を判別することができる。As described above, according to the first aspect of the present invention, in an optical communication system in which a master station and a plurality of slave stations are connected in a star through an optical splitter, each of the slave stations has Since the main signal and the wavelength are different, and each slave station decides to assign a monitoring optical signal set to its own wavelength, the master station only determines the wavelength and the master station determines whether each slave station has a fault. Can be determined.
【0027】また、請求項5記載の発明によれば、監視
用光信号断検出手段が、監視用信号光選択的出力手段の
選択的出力に同期してその出力される波長と同一の波長
の監視用信号光が対応する子局から返送されてきたかど
うかの判別を行うことでそれぞれの子局に割り当てられ
た監視用信号光の断検出を行うので、個々の信号の判別
のための情報を組み込んで送出するような構成に比べ
て、このような時分割的な処理によって、監視用光信号
断検出手段の波長ごとの判別のための構成を単純化する
ことが可能になる。According to the fifth aspect of the present invention, the monitoring optical signal disconnection detecting means is synchronized with the selective output of the monitoring signal light selective output means and has the same wavelength as the output wavelength. By determining whether or not the monitoring signal light is returned from the corresponding slave station, the disconnection of the monitoring signal light assigned to each slave station is detected. Compared with a configuration in which the signal is incorporated and transmitted, such a time-division processing makes it possible to simplify the configuration for discriminating each wavelength of the monitoring optical signal disconnection detecting means.
【図1】本発明の一実施例における障害監視システムの
構成を示すブロック図である。FIG. 1 is a block diagram illustrating a configuration of a fault monitoring system according to an embodiment of the present invention.
【図2】従来の障害監視システムの構成を示すブロック
図である。FIG. 2 is a block diagram showing a configuration of a conventional fault monitoring system.
【符号の説明】 11 監視制御装置(監視判別手段) 12 親局 131 〜13N 第1〜第Nの子局 14 光スプリッタ 15、31 E/O・O/E変換部 16 上りバースト信号検出部(主信号断検出手段) 17 線路監視部 21、33 合分波部 22 断検出部(監視用光信号断検出手段) 25 試験光源部 26 線路監視制御部 32 線路監視用ループバック部 34 光導波路[Description of Signs] 11 Supervisory control device (monitoring determination means) 12 Master station 13 1 to 13 N First to Nth slave stations 14 Optical splitter 15, 31 E / O / O / E converter 16 Uplink burst signal detection Unit (main signal disconnection detecting unit) 17 line monitoring unit 21, 33 multiplexing / demultiplexing unit 22 disconnection detecting unit (monitoring optical signal disconnection detecting unit) 25 test light source unit 26 line monitoring control unit 32 line monitoring loopback unit 34 light guide Wave path
───────────────────────────────────────────────────── フロントページの続き (58)調査した分野(Int.Cl.7,DB名) H04B 17/02 H04B 10/08 H04B 10/20 H04B 3/46 ──────────────────────────────────────────────────続 き Continued on the front page (58) Field surveyed (Int.Cl. 7 , DB name) H04B 17/02 H04B 10/08 H04B 10/20 H04B 3/46
Claims (5)
りかつ自局専用の波長が割り当てられた監視用光信号を
分離してこの自局専用の監視用光信号をそのまま折り返
すように主信号に波長多重して出力する複数の子局と、 これら複数の子局をスター状に接続した光スプリッタ
と、 この光スプリッタを介して前記複数の子局と接続されこ
れらの子局から送られてきた光信号から主信号と前記監
視用光信号を分離する分波手段と、この分波手段で分離
された主信号の断を検出する上り主信号断検出手段と、
前記分波手段で分離された前記複数の子局の監視用光信
号の個別の断を検出する監視用光信号断検出手段と、こ
れら複数の子局の監視用光信号を発生して主信号に合波
して前記光スプリッタを経由してそれぞれの子局に送出
する信号送出手段と、前記主信号断検出手段と監視用光
信号断検出手段の検出結果を入力して、これらの断検出
の組合せによって前記光スプリッタと特定の子局との間
に障害が発生しているか特定の子局で主信号と監視用信
号の合波および分波を行う箇所以外の箇所で障害が発生
しているかの判別を行う監視判別手段とを備えた親局と
を具備することを特徴とする障害監視システム。1. A main signal which separates a monitoring optical signal having a wavelength different from that of a main signal from a received optical signal and to which a wavelength dedicated to the own station is allocated, and returns the monitoring optical signal dedicated to the own station as it is. A plurality of slave stations for wavelength multiplexing and outputting the same, an optical splitter in which the plurality of slave stations are connected in a star shape, and a plurality of slave stations connected to the plurality of slave stations via the optical splitter and transmitted from these slave stations. Branching means for separating the main signal and the monitoring optical signal from the separated optical signal, and an upstream main signal break detection means for detecting breakage of the main signal separated by the branching means,
Monitoring optical signal disconnection detecting means for detecting individual disconnection of the monitoring optical signals of the plurality of slave stations separated by the demultiplexing means; and a main signal for generating the monitoring optical signals of the plurality of slave stations and generating a main signal. And signal detection means for transmitting to the respective slave stations via the optical splitter and the detection results of the main signal disconnection detecting means and the monitoring optical signal disconnection detecting means. A failure occurs between the optical splitter and a specific slave station due to the combination of the above, or a failure occurs at a place other than the place where the main signal and the monitoring signal are multiplexed and demultiplexed at the particular slave station. A fault monitoring system, comprising: a master station having a monitoring determining means for determining whether or not a fault has occurred.
した自局専用の波長の割り当てられた監視用光信号を自
局のループバック用光導波路を経由して自局内で主信号
と多重し前記光スプリッタを経由して前記親局に送出す
ることを特徴とする請求項1記載の障害監視システム。2. The plurality of slave stations, each of which separates a monitoring optical signal assigned a wavelength dedicated to the own station, separated from the own station, into a main signal within the own station via a loop-back optical waveguide of the own station. 2. The fault monitoring system according to claim 1, wherein the signal is multiplexed and transmitted to the master station via the optical splitter.
断検出手段が特定の子局の監視用光信号のみを未検出で
他の子局の監視用光信号を検出しているときは、前記光
スプリッタとその特定の子局との間の伝送路に障害が発
生していると判別することを特徴とする請求項1記載の
障害監視システム。3. The monitoring determining means, when the monitoring optical signal disconnection detecting means has not detected only a monitoring optical signal of a specific slave station and has detected a monitoring optical signal of another slave station. 2. The fault monitoring system according to claim 1, wherein it is determined that a fault has occurred in a transmission path between the optical splitter and the specific slave station.
手段が特定の子局の主信号のみ未検出で前記監視用光信
号断検出手段がその特定の子局の監視用光信号を検出し
ているとき、その特定の子局内に障害が発生していると
判別することを特徴とする請求項1記載の障害監視シス
テム。4. The monitoring discriminating means, wherein the main signal loss detecting means does not detect only a main signal of a specific slave station, and the monitoring optical signal loss detecting means detects a monitoring optical signal of the specific slave station. 2. The fault monitoring system according to claim 1, wherein when the fault occurs, it is determined that a fault has occurred in the specific slave station.
に監視用信号光として割り当てた波長の監視用信号光を
選択的に出力する監視用信号光選択的出力手段を備えて
おり、前記監視用光信号断検出手段は、監視用信号光選
択的出力手段の選択的出力に同期してその出力される波
長と同一の波長の監視用信号光が対応する子局から返送
されてきたかどうかの判別を行うことでそれぞれの子局
に割り当てられた監視用信号光の断検出を行うことを特
徴とする請求項1記載の障害監視システム。5. The master station further includes a monitoring signal light selective output unit that selectively outputs a monitoring signal light having a wavelength allocated to each of the plurality of slave stations as a monitoring signal light, The monitoring optical signal disconnection detecting means, in synchronization with the selective output of the monitoring signal light selective output means, has the monitoring signal light having the same wavelength as the output wavelength returned from the corresponding slave station? 2. The fault monitoring system according to claim 1, wherein a determination is made as to whether disconnection of the monitoring signal light allocated to each slave station is detected.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
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JP8967897A JP3090083B2 (en) | 1997-04-08 | 1997-04-08 | Fault monitoring system |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP8967897A JP3090083B2 (en) | 1997-04-08 | 1997-04-08 | Fault monitoring system |
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JPH10285127A JPH10285127A (en) | 1998-10-23 |
JP3090083B2 true JP3090083B2 (en) | 2000-09-18 |
Family
ID=13977426
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JP5188406B2 (en) * | 2009-01-21 | 2013-04-24 | 日本電信電話株式会社 | Optical line failure section estimation system and failure section estimation device |
JP5606405B2 (en) * | 2011-07-19 | 2014-10-15 | 日本電信電話株式会社 | Branch location optical fiber fault location search apparatus and search method therefor |
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