JP2601193B2 - Optical transmission system - Google Patents

Optical transmission system

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Publication number
JP2601193B2
JP2601193B2 JP6127830A JP12783094A JP2601193B2 JP 2601193 B2 JP2601193 B2 JP 2601193B2 JP 6127830 A JP6127830 A JP 6127830A JP 12783094 A JP12783094 A JP 12783094A JP 2601193 B2 JP2601193 B2 JP 2601193B2
Authority
JP
Japan
Prior art keywords
signal
monitoring
optical
optical transmission
wavelength
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
Application number
JP6127830A
Other languages
Japanese (ja)
Other versions
JPH07336296A (en
Inventor
浩志 中石
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
NEC Corp
Original Assignee
NEC Corp
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by NEC Corp filed Critical NEC Corp
Priority to JP6127830A priority Critical patent/JP2601193B2/en
Publication of JPH07336296A publication Critical patent/JPH07336296A/en
Application granted granted Critical
Publication of JP2601193B2 publication Critical patent/JP2601193B2/en
Anticipated expiration legal-status Critical
Expired - Fee Related legal-status Critical Current

Links

Description

【発明の詳細な説明】DETAILED DESCRIPTION OF THE INVENTION

【0001】[0001]

【産業上の利用分野】本発明は、スターカプラにより相
互に接続された光伝送方式に関する。本発明は、LAN
(ローカル・エリア・ネットワーク)に利用するに適す
る。
BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an optical transmission system interconnected by a star coupler. The present invention relates to a LAN
(Local area network).

【0002】[0002]

【従来の技術】多数の光通信装置の入出力端にそれぞれ
光伝送路(光ファイバ)の一端が接続され、その光伝送
路の他端が一つ(または複数)のスターカプラにより相
互に接続され、どの光通信装置からどの光通信装置へも
光信号を伝送することができるように構成された光伝送
方式が知られている。このような光伝送方式は、一例と
して特開昭64−32734号公報に記載がある。この
ようにスターカプラにより相互に接続された通信装置の
一つが局装置であり、他の多数の通信装置が加入者装置
であるとすると、その一つの局装置が主通信網や主情報
処理装置に接続されると、このスターカプラにより接続
された光伝送方式は一つのLANを形成することにな
る。
2. Description of the Related Art One end of an optical transmission line (optical fiber) is connected to input / output terminals of a large number of optical communication devices, and the other end of the optical transmission line is mutually connected by one (or a plurality of) star couplers. An optical transmission system configured to transmit an optical signal from any optical communication device to any optical communication device is known. Such an optical transmission system is described in JP-A-64-32734 as an example. Assuming that one of the communication devices interconnected by the star coupler is a station device and many other communication devices are subscriber devices, one of the station devices is a main communication network or a main information processing device. , The optical transmission system connected by the star coupler forms one LAN.

【0003】ここで、加入者装置が主通信網や主情報処
理装置と通信を行う場合には、どの加入者装置が相手で
あっても局装置が利用されることから、このLANとし
て一定基準の信頼性を確保するために局装置を一つにす
るのではなく、現用系および予備系を装備して冗長化す
ることが考えられた。すなわち、同等の局装置を2個設
けて、いずれの局装置も上記スターカプラに接続してお
き、かりに一方の局装置が故障しても他方の局装置を利
用することにより、そのLAN全体が利用できなくなる
ような障害発生を少なくしようとするものである。
Here, when a subscriber unit communicates with a main communication network or a main information processing unit, a station device is used regardless of which subscriber unit is the partner, so that the LAN has a certain standard. In order to ensure the reliability of the system, it was conceived not to use a single station apparatus but to provide an active system and a standby system for redundancy. In other words, two equivalent station devices are provided, and both station devices are connected to the star coupler. Even if one of the station devices fails, the other station device is used, so that the entire LAN can be used. An attempt is made to reduce the occurrence of failures that make the service unusable.

【0004】局装置およびその局装置からスターカプラ
までの伝送路を二重化して現用系および予備系を設けて
おき、そのいずれかを切替えて利用しようとするなら、
その二つの系がそれぞれ良好に動作しているか否かの監
視を行うことが必要である。図3はこのための従来例監
視方式の構成図である。この図は、主信号の伝送部分を
省いて監視方式のみを示してある。
If the station apparatus and the transmission path from the station apparatus to the star coupler are duplicated to provide an active system and a standby system, and one of them is to be switched and used,
It is necessary to monitor whether the two systems are operating well. FIG. 3 is a configuration diagram of a conventional monitoring method for this purpose. In this figure, only the monitoring method is shown without the transmission part of the main signal.

【0005】この従来の光伝送システムは、局装置1−
1および1−2が光伝送路4−1および4−2を介して
スターカプラ3に接続され、このスターカプラ3に多数
の加入者装置2−1〜2−nが接続される。また、局装
置1−1、1−2、および加入者装置20−1〜20−
nのそれぞれには伝送路障害監視部10が備えられてい
る。
[0005] This conventional optical transmission system comprises a station apparatus 1-
1 and 1-2 are connected to a star coupler 3 via optical transmission lines 4-1 and 4-2, and a large number of subscriber units 2-1 to 2-n are connected to the star coupler 3. Further, the station devices 1-1 and 1-2 and the subscriber devices 20-1 to 20-
Each of n has a transmission line fault monitoring unit 10.

【0006】この伝送路障害監視部10には、伝送路障
害監視用のデータを挿入する伝送路障害監視用データ挿
入部11と、この伝送路障害監視用データ挿入部11か
らの電気信号を受けある一定波長の光信号に変換して出
力する電気/光変換回路12と、この電気/光変換回路
12からの光信号を通過させるとともに光伝送路4−
1、4−2および5−1、5−2、…、5−nから受信
した光信号を通過させるWDM(波長分割多重方式)フ
ィルタ13と、このWDMフィルタ13からの光信号を
電気信号に変換する光/電気変換回路14と、この光/
電気変換回路14からの信号を受け伝送路の障害を検出
する伝送路障害検出部15とが含まれる。
The transmission path fault monitoring section 10 receives a transmission path fault monitoring data insertion section 11 for inserting transmission path fault monitoring data, and receives an electric signal from the transmission path fault monitoring data insertion section 11. An electrical / optical conversion circuit 12 for converting the optical signal into an optical signal having a certain wavelength and outputting the optical signal; an optical signal from the electrical / optical conversion circuit 12;
, 5-2-1,..., 5-n, and a WDM (wavelength division multiplexing) filter 13 for passing optical signals received therefrom, and converting the optical signals from the WDM filter 13 into electrical signals. An optical / electrical conversion circuit 14 for converting the light / electrical
And a transmission path failure detection unit 15 that receives a signal from the electric conversion circuit 14 and detects a transmission path failure.

【0007】[0007]

【発明が解決しようとする課題】このような伝送路にス
ターカプラを用いた従来の光伝送システムでは、スター
カプラと局装置間との伝送路が冗長構成であるにもかか
わらず、局装置から送信する光信号の波長を局装置毎に
変えていないので、複数の局装置から送信される光信号
が衝突する可能性がある。そこで、この光信号の衝突を
避けるために現用系局装置からの送信信号のみを送信
し、予備系局装置からの送信信号を禁止する時分割的な
制御を行うほかない。この場合、予備系局装置からの送
信信号が禁止される都度に予備伝送路の監視ができず、
したがって二つの伝送路障害を常時検出することができ
ない問題がある。
In a conventional optical transmission system using a star coupler in such a transmission path, the transmission from the station apparatus is performed even though the transmission path between the star coupler and the station apparatus has a redundant configuration. Since the wavelength of the optical signal to be transmitted is not changed for each station device, there is a possibility that optical signals transmitted from a plurality of station devices collide. Therefore, in order to avoid the collision of the optical signals, only the transmission signal from the active system station device is transmitted, and the time division control for prohibiting the transmission signal from the standby system device must be performed. In this case, each time the transmission signal from the standby system station is prohibited, the standby transmission line cannot be monitored,
Therefore, there is a problem that two transmission path failures cannot always be detected.

【0008】本発明はこのような問題を解決するもの
で、局装置とスターカプラとの間の伝送路が冗長構成で
ある場合に予備系伝送路の監視を常時行うことができる
光伝送システムを提供することを目的とする。
The present invention solves such a problem. An optical transmission system capable of constantly monitoring a standby transmission line when a transmission line between a station device and a star coupler has a redundant configuration. The purpose is to provide.

【0009】[0009]

【課題を解決するための手段】本発明は、局装置と、n
個(nは自然数)の加入者装置とを備え、その局装置お
よびその加入者装置はその入出力端にそれぞれ光伝送路
の一端が接続され、その光伝送路の他端がスターカプラ
により相互に接続され、前記局装置と前記加入者装置の
少なくとも1つとの間に監視信号を送受信する手段を備
えた光伝送方式において、前記局装置およびその局装置
に接続された光伝送路は複数の冗長構成であり、前記監
視信号の波長はその冗長構成された複数の光伝送路毎に
異なることを特徴とする。
According to the present invention, there is provided a station apparatus comprising:
(N is a natural number), and each of the station device and the subscriber device has one end of an optical transmission line connected to its input / output terminal, and the other end of the optical transmission line connected to each other by a star coupler. And an optical transmission system comprising means for transmitting and receiving a monitoring signal between the station device and at least one of the subscriber devices. In the optical transmission system, the station device and the optical transmission line connected to the station device include a plurality of optical transmission lines. In a redundant configuration, the wavelength of the monitor signal is different for each of the plurality of redundantly configured optical transmission lines.

【0010】前記複数は2であり、前記監視信号は対応
する光伝送路の主信号の有無にかかわらずそれぞれ継続
的に送受信され、前記局装置と前記n個の加入者装置と
の間に前記スターカプラを介して伝送される主信号の光
波長帯(λp)に対して、前記監視信号の二つの波長
(λ0 およびλ1 )は前記主信号の光波長帯の外に設定
され、前記監視信号は前記局装置から前記加入者装置に
(下り)および前記加入者装置から前記局装置に(上
り)双方向に伝送され、また、監視用に設定された特別
なデータ信号であることが望ましく、前記監視信号を送
受信する手段を備えた加入者装置が複数であり、前記デ
ータ信号はその加入者装置毎に識別できるように構成す
ることができる。
[0010] The plurality is two, and the monitoring signals are continuously transmitted and received irrespective of the presence or absence of the main signal of the corresponding optical transmission line, and the monitoring signal is transmitted between the station apparatus and the n subscriber apparatuses. With respect to the optical wavelength band (λp) of the main signal transmitted via the star coupler, two wavelengths (λ 0 and λ 1 ) of the monitor signal are set outside the optical wavelength band of the main signal, The monitoring signal is bidirectionally transmitted from the station device to the subscriber device (down) and from the subscriber device to the station device (up), and may be a special data signal set for monitoring. Desirably, a plurality of subscriber units are provided with means for transmitting and receiving the monitoring signal, and the data signal can be identified for each of the subscriber units.

【0011】[0011]

【作用】局装置と加入者装置との間で現用系および予備
系毎に波長の異なる光信号を送受信して障害を検出す
る。これにより局装置とスターカプラとの間の光伝送路
が現用および予備の冗長構成であっても予備系伝送路の
監視を常時行うことができる。
An optical signal having a different wavelength is transmitted and received between the station device and the subscriber device for each of the active system and the standby system to detect a failure. Thereby, even if the optical transmission line between the station device and the star coupler has a working and a standby redundant configuration, the standby transmission line can always be monitored.

【0012】[0012]

【実施例】次に、本発明実施例を図面に基づいて説明す
る。図1は本発明実施例光伝送方式の全体構成を示すブ
ロック図、図2は本発明実施例光伝送方式における監視
方式の部分の構成を示すブロック図である。
Next, an embodiment of the present invention will be described with reference to the drawings. FIG. 1 is a block diagram showing the overall configuration of the optical transmission system according to the embodiment of the present invention, and FIG. 2 is a block diagram showing the configuration of a monitoring system in the optical transmission system according to the embodiment of the present invention.

【0013】図1において、n個の加入者装置2−1〜
2−nと、二つの局装置1−1、1−2とが、それぞれ
光ファイバを介して一つのスターカプラ3により相互に
接続されている。二つの局装置1−1、1−2は現用系
(0系)および予備系(1系)であり、この光伝送方式
を利用して行われる通信の主信号は、この局装置1−
1、1−2の一方と加入者装置2−1〜2−nとの間で
行われる。加入者装置2−1〜2−nはn個あり、この
n個の加入者装置2−1〜2−nが同時に一つの局装置
1−1または1−2と通信を行う場合(放送)もあり得
るし、このn個の加入者装置2−1〜2−nのうちの一
つが一つの局装置1−1または1−2と通信を行う場合
(個別)もある。
In FIG. 1, n subscriber units 2-1 to 2-1
2-n and the two station devices 1-1 and 1-2 are mutually connected by one star coupler 3 via an optical fiber. The two station devices 1-1 and 1-2 are an active system (system 0) and a standby system (system 1), and a main signal of communication performed using this optical transmission system is transmitted to the station device 1-1-2.
1 and 1-2 and the subscriber devices 2-1 to 2-n. There are n subscriber units 2-1 to 2-n, and the n subscriber units 2-1 to 2-n simultaneously communicate with one station device 1-1 or 1-2 (broadcast). In some cases, one of the n subscriber devices 2-1 to 2-n communicates with one station device 1-1 or 1-2 (individually).

【0014】二つの局装置1−1、1−2には、それぞ
れ主信号送受信回路6−1、6−2を備えている。主信
号はここでは光波長帯域λpにより行われる。この二つ
の局装置1−1、1−2は常に同時に動作状態にある
が、その主信号は現用系予備系切替装置7によりその一
方が選択されて、図外の主通信網や主情報処理装置に接
続されている。かりに、現用系に障害が発生すると直ち
に予備系に切替が行われる。この切替制御については本
願発明とは直接に関係がないので、ここでは詳しい説明
を省略する。
The two station devices 1-1 and 1-2 have main signal transmission / reception circuits 6-1 and 6-2, respectively. The main signal is generated here by the optical wavelength band λp. The two station devices 1-1 and 1-2 are always operating at the same time, but one of the main signals is selected by the active / standby switching device 7, and the main communication network and main information processing (not shown) are performed. Connected to device. Meanwhile, when a failure occurs in the active system, switching to the standby system is performed immediately. Since this switching control is not directly related to the present invention, a detailed description is omitted here.

【0015】この二つの局装置1−1、1−2には、主
信号送受信回路6の他に、この局装置1−1、1−2と
スターカプラ3とをそれぞれ接続する光伝送路を監視す
るために監視信号送受信回路8を備えている。この監視
信号送受信回路8は、加入者装置2−1〜2−nにその
相手方が設けられていて、この実施例では、この加入者
装置2−1〜2−nとの間に双方向の監視信号送受信が
行われている。
In addition to the main signal transmission / reception circuit 6, the two station devices 1-1 and 1-2 have optical transmission paths for connecting the station devices 1-1 and 1-2 and the star coupler 3, respectively. A monitoring signal transmitting / receiving circuit 8 is provided for monitoring. The supervisory signal transmission / reception circuit 8 is provided with a counterpart in each of the subscriber units 2-1 to 2-n. In this embodiment, a bidirectional communication is provided between the subscriber units 2-1 to 2-n. Monitoring signal transmission / reception is being performed.

【0016】ここで本発明の特徴とするところは、この
二つの局装置1−1、1−2に設けられた監視信号送受
信回路8が送受信する光波長は、この0系と1系とで別
の波長に設定されたところにある。
Here, the feature of the present invention is that the optical wavelengths transmitted and received by the monitoring signal transmitting and receiving circuits 8 provided in the two station devices 1-1 and 1-2 are based on the 0 system and the 1 system. It is set to another wavelength.

【0017】すなわち、0系局装置1−1および1系局
装置1−2と、n個(nは自然数)の加入者装置2−1
〜2−nとを備え、その局装置1−1、1−2およびそ
の加入者装置2−1〜2−nはその入出力端にそれぞれ
光伝送路5−1、5−2および9−1〜9−nの一端が
接続され、その光伝送路5−1、5−2および9−1〜
9−nの他端がスターカプラ3により相互に接続され、
局装置1−1、1−2と加入者装置2−1〜2−nの少
なくとも1つとの間に監視信号を送受信する監視信号送
受信回路8を備え、局装置1−1、1−2およびその局
装置1−1、1−2に接続された光伝送路5−1、5−
2は二つの冗長構成であり、前記監視信号の波長はその
冗長構成された二つの光伝送路5−1、5−2毎に異な
る。
That is, the 0-system station apparatus 1-1 and the 1-system station apparatus 1-2 and n (n is a natural number) subscriber apparatuses 2-1.
, And the optical network units 1-1 and 1-2 and the subscriber units 2-1 to 2-n are provided at their input / output terminals with optical transmission lines 5-1, 5-2 and 9-n respectively. 1 to 9-n are connected, and the optical transmission lines 5-1 and 5-2 and 9-1 to 9-1 are connected.
9-n are connected to each other by a star coupler 3,
A supervisory signal transmitting and receiving circuit 8 for transmitting and receiving supervisory signals between the station devices 1-1 and 1-2 and at least one of the subscriber devices 2-1 to 2-n is provided. The optical transmission lines 5-1 and 5- connected to the station devices 1-1 and 1-2.
Reference numeral 2 denotes two redundant configurations, and the wavelength of the supervisory signal differs for each of the two optical transmission lines 5-1 and 5-2 having the redundant configuration.

【0018】前記監視信号は対応する光伝送路5−1、
5−2および9−1〜9−nの主信号の有無にかかわら
ずそれぞれ継続的に送受信され、局装置1−1、1−2
とn個の加入者装置2−1〜2−nとの間にスターカプ
ラ3を介して伝送される主信号の光波長帯(λp)に対
して、前記監視信号の二つの波長(λ0 およびλ1 )は
前記主信号の光波長帯の外に設定される。また、前記監
視信号は局装置1−1、1−2から加入者装置2−1〜
2−nに(下り)および加入者装置2−1〜2−nから
局装置1−1、1−2に(上り)双方向に伝送され、そ
の監視信号は監視用に設定された特別なデータ信号であ
る。加入者装置2−1〜2−nには前記監視信号を送受
信する監視信号送受信回路が備えられ、前記データ信号
はその加入者装置2−1〜2−n毎に識別できるように
構成される。
The monitoring signal is transmitted to the corresponding optical transmission line 5-1,
5-2 and 9-1 to 9-n are continuously transmitted and received irrespective of the presence or absence of the main signal.
And the two wavelengths (λ 0 ) of the monitoring signal with respect to the optical wavelength band (λ p) of the main signal transmitted via the star coupler 3 between the n-th subscriber unit 2-1 to 2-n. And λ 1 ) are set outside the optical wavelength band of the main signal. The monitoring signals are transmitted from the station devices 1-1 and 1-2 to the subscriber devices 2-1 to 2-1.
2-n (down) and from the subscriber units 2-1 to 2-n to the station units 1-1 and 1-2 (up) in both directions, and the monitoring signal is transmitted to a special device set for monitoring. It is a data signal. Each of the subscriber units 2-1 to 2-n is provided with a supervisory signal transmitting / receiving circuit for transmitting and receiving the supervisory signal, and the data signal is configured to be identified for each of the subscriber units 2-1 to 2-n. .

【0019】局装置1−1、1−2および加入者装置2
−1〜2−nそれぞれには、図2に示すように、現用の
伝送路5−1および5−2を監視し障害を検出する伝送
路障害監視部10を備え、さらに、加入者装置2−1〜
2−nそれぞれに、伝送路5−1および5−2を系毎に
監視し異常を検出する0系伝送路障害監視部10aおよ
び1系伝送路障害監視部10bと、光伝送路5−1、5
−2の系毎に波長の異なる光信号を受信し障害を検出す
るとともに、その系毎に波長の異なる光信号を局装置1
−1、1−2毎に送信する加入者装置スターカプラ16
とを備える。
The station devices 1-1 and 1-2 and the subscriber device 2
As shown in FIG. 2, each of -1 to 2-n includes a transmission line fault monitoring unit 10 for monitoring the active transmission lines 5-1 and 5-2 and detecting a fault. -1 to
2-n, a transmission line fault monitoring unit 10a and a transmission line fault monitoring unit 10b for monitoring the transmission lines 5-1 and 5-2 for each system and detecting an abnormality, and an optical transmission line 5-1. , 5
-2, an optical signal having a different wavelength is received for each system to detect a failure, and an optical signal having a different wavelength is transmitted to the station apparatus 1 for each system.
-1 and subscriber unit star coupler 16 for transmission every 1-2
And

【0020】また、局装置1−1、1−2の伝送路障害
監視部10と、加入者装置2−1〜2−nの0系伝送路
障害監視部10aおよび1系伝送路障害監視部10bに
は、光伝送路の障害監視用データを挿入する伝送路障害
監視用データ挿入部11と、この伝送路障害監視用デー
タ挿入部11からの信号を入力して前記光伝送路5−
1、5−2毎に定められた波長の光信号を出力する電気
/光変換回路12と、この電気/光変換回路12からの
光信号を通過させるとともに受信した光信号のうちの伝
送路5−1および5−2毎に定められた波長の光信号を
通過させるWDM(波長分割多重方式)フィルタ13
と、このWDMフィルタ13からの光信号を電気信号に
変換する光/電気変換回路14と、この光/電気変換回
路14からの信号から光伝送路5−1および5−2の障
害を検出する伝送路障害検出部15とを備える。
The transmission line fault monitoring units 10 of the station devices 1-1 and 1-2, the 0-system transmission line fault monitoring units 10a and 1-system transmission line monitoring units of the subscriber units 2-1 to 2-n. 10b, a transmission path fault monitoring data insertion unit 11 for inserting fault monitoring data of the optical transmission path, and a signal from the transmission path fault monitoring data insertion unit 11 is input to the optical transmission path 5-b.
An electrical / optical conversion circuit 12 for outputting an optical signal having a wavelength determined for each of the optical signals 1, 5-2, and an optical signal from the electrical / optical conversion circuit 12. WDM (wavelength division multiplexing) filter 13 for passing an optical signal having a wavelength determined for each of -1 and 5-2
And an optical / electrical conversion circuit 14 for converting an optical signal from the WDM filter 13 into an electric signal, and detecting a failure in the optical transmission lines 5-1 and 5-2 from the signal from the optical / electrical conversion circuit 14. And a transmission path failure detection unit 15.

【0021】次に、このように構成された本発明実施例
の動作について説明する。
Next, the operation of the embodiment of the present invention thus configured will be described.

【0022】局装置1−1の伝送路障害監視用データ挿
入部11が送信する光信号に伝送路障害監視用のデータ
を挿入し、電気/光変換回路12がその信号を伝送路毎
に定められた光信号に変換してWDMフィルタ13に送
出する。WDMフィルタ13は受信した光信号のうち伝
送路5−1および5−2毎に定められた波長の光信号を
通過させる。WDMフィルタ13を通過した光信号は、
定められた0系の光伝送路5−1または1系の光伝送路
5−2からスターカプラ3に送出され分岐されて所定の
加入者装置2−1〜2−nのいずれか、例えば加入者装
置2−1に送出される。
The transmission line fault monitoring data insertion unit 11 of the station apparatus 1-1 inserts transmission line fault monitoring data into the transmitted optical signal, and the electrical / optical conversion circuit 12 determines the signal for each transmission line. The optical signal is converted into an optical signal and transmitted to the WDM filter 13. The WDM filter 13 passes an optical signal having a wavelength determined for each of the transmission paths 5-1 and 5-2 among the received optical signals. The optical signal that has passed through the WDM filter 13 is
The optical signal is transmitted to the star coupler 3 from the determined optical transmission line 5-1 of the system 0 or the optical transmission line 5-2 of the system 1 and is branched to any one of the predetermined subscriber units 2-1 to 2-n. Is sent to the user device 2-1.

【0023】加入者装置2−1では、加入者装置スター
カプラ16がその光信号を受信し、それが0系の光伝送
路5−1から受信したものであれば0系伝送路障害監視
部10aに送出し、1系の光伝送路5−2から受信した
ものであれば1系伝送路障害監視部10bに送出する。
In the subscriber unit 2-1, the subscriber unit star coupler 16 receives the optical signal, and if the optical signal is received from the 0-system optical transmission line 5-1, the 0-system transmission line fault monitoring unit. If the signal is received from the optical transmission line 5-2 of the first system, it is transmitted to the transmission line failure monitoring unit 10b of the first system.

【0024】受信した光信号が0系の伝送路5−1から
のものであるとすると、0系伝送路障害監視部10aの
WDMフィルタ13がその光信号を受信して光/電気変
換回路14に送出する。光/電気変換回路14は電気信
号に変換して伝送路障害検出部15に送出する。伝送路
障害検出部15は受信した信号から伝送路障害監視用デ
ータを検出して伝送路障害があるか否かを監視する。
Assuming that the received optical signal is from the 0-system transmission line 5-1, the WDM filter 13 of the 0-system transmission line fault monitoring unit 10a receives the optical signal and To send to. The optical / electrical conversion circuit 14 converts the signal into an electric signal and sends it to the transmission path fault detecting unit 15. The transmission path failure detection unit 15 detects transmission path failure monitoring data from the received signal and monitors whether there is a transmission path failure.

【0025】一方、加入者装置2−1内の1系伝送路障
害監視部10bの伝送路障害監視用データ挿入部11が
送信する信号に伝送路障害監視用のデータを挿入し送出
したとすると、電気/光変換回路12がその信号を伝送
路毎に定められた光信号に変換してWDMフィルタ13
に送出する。WDMフィルタ13は受信した光信号が伝
送路5−2を経て伝送されるものであれば通過させ、加
入者装置スターカプラ16、スターカプラ3、および1
系の光伝送路5−2を経由して局装置1−2に送信す
る。
On the other hand, it is assumed that transmission path failure monitoring data is inserted into a signal transmitted by the transmission path failure monitoring data insertion section 11 of the 1-system transmission path failure monitoring section 10b in the subscriber unit 2-1, and transmitted. , An electrical / optical conversion circuit 12 converts the signal into an optical signal determined for each transmission line and
To send to. The WDM filter 13 allows the received optical signal to pass if it is transmitted through the transmission line 5-2, and allows the subscriber unit star coupler 16, star coupler 3, and 1
The signal is transmitted to the station device 1-2 via the optical transmission line 5-2 of the system.

【0026】局装置1−2では、その信号を受信しWD
Mフィルタ13が伝送路5−2からの光信号であれば通
過させて光/電気変換回路14に送出する。光/電気変
換回路14はこの光信号を電気信号に変換して伝送路障
害検出部15に送出する。伝送路障害検出部15ではそ
の信号から伝送路障害監視用データを検出して伝送路障
害があるか否かを監視する。
The station device 1-2 receives the signal, and
If the M filter 13 is an optical signal from the transmission line 5-2, the optical signal is passed and sent to the optical / electrical conversion circuit 14. The optical / electrical conversion circuit 14 converts this optical signal into an electric signal and sends it to the transmission path fault detecting unit 15. The transmission path failure detection unit 15 detects transmission path failure monitoring data from the signal and monitors whether there is a transmission path failure.

【0027】このような動作により、伝送路が冗長構成
であっても、1系伝送路、すなわち予備系伝送路の障害
監視を常時行うことができる。
With such an operation, even if the transmission path has a redundant configuration, it is possible to always monitor the failure of the first transmission path, that is, the protection transmission path.

【0028】[0028]

【発明の効果】以上説明したように本発明によれば、伝
送路の系毎に光信号の波長を変えることができるので、
冗長構成の伝送路においても予備系伝送の伝送路障害を
常時監視することができる効果がある。
As described above, according to the present invention, the wavelength of an optical signal can be changed for each transmission line system.
There is an effect that the transmission line failure of the backup transmission can be constantly monitored even in the transmission line of the redundant configuration.

【図面の簡単な説明】[Brief description of the drawings]

【図1】本発明実施例光伝送方式の全体構成を示すブロ
ック図。
FIG. 1 is a block diagram showing an overall configuration of an optical transmission system according to an embodiment of the present invention.

【図2】本発明実施例光伝送方式における監視方式の部
分の構成を示すブロック図。
FIG. 2 is a block diagram showing a configuration of a part of a monitoring system in the optical transmission system according to the embodiment of the present invention.

【図3】従来例光伝送方式における監視方式の部分の構
成を示すブロック図。
FIG. 3 is a block diagram showing a configuration of a part of a monitoring system in a conventional optical transmission system.

【符号の説明】[Explanation of symbols]

1−1、1−2 局装置 2−1〜2−n、20−1〜20−n 加入者装置 3 スターカプラ 4−1、4−2 光伝送路 5−1 0系光伝送路 5−2 1系光伝送路 6 主信号送受信回路 7 現用系予備系切替装置 8 監視信号送受信回路 9−1〜9−n 光伝送路 10 伝送路障害監視部 10a 0系伝送路障害監視部 10b 1系伝送路障害監視部 11 伝送路障害監視用データ挿入部 12 電気/光変換回路 13 WDMフィルタ 14 光/電気変換回路 15 伝送路障害検出部 16 加入者装置スターカプラ 1-1, 1-2 station device 2-1 to 2-n, 20-1 to 20-n subscriber device 3 star coupler 4-1, 4-2 optical transmission line 5-1 0-system optical transmission line 5- 2 1 system optical transmission line 6 main signal transmission / reception circuit 7 active system protection system switching device 8 monitoring signal transmission / reception circuit 9-1 to 9-n optical transmission line 10 transmission line failure monitoring unit 10a 0 system transmission line failure monitoring unit 10b 1 system Transmission path failure monitoring section 11 Transmission path failure monitoring data insertion section 12 Electric / optical conversion circuit 13 WDM filter 14 Optical / electric conversion circuit 15 Transmission path failure detection section 16 Subscriber device star coupler

Claims (4)

(57)【特許請求の範囲】(57) [Claims] 【請求項1】 二つの局装置とn個(nは自然数)の加
入者装置とがスターカプラを介する光伝送路により相互
に接続され、前記二つの局装置が現用系および予備系に
使用される冗長構成の光伝送方式であり、 前記二つの局装置と前記加入者装置の少なくとも一つと
は、その間を接続する光伝送路ごとに異なる波長の監視
信号を送受信する手段を備えた 光伝送方式において、前記現用系および予備系に使用される光伝送路ごとに異
なる監視信号の波長(λ 0 およびλ 1 )は、前記光伝送
路を介して伝送される主信号の光波長帯(λp)の外に
設定され、 前記二つの局装置は、それぞれの光伝送路で監視信号と
して設定された波長により前記加入者装置との間で主信
号の有無にかかわらず継続的に双方向で監視信号の送受
信を行う手段を備え、 前記加入者装置は、監視信号として設定された前記二つ
の波長によって前記二つの局装置との間で主信号の有無
にかかわらず継続的に双方向で監視信号の送受信を行う
手段を備えた ことを特徴とする光伝送方式。
1. The two station devices and n (n is a natural number) subscriber units are mutually connected by an optical transmission line via a star coupler.
Are connected to the active and standby systems.
An optical transmission system having a redundant configuration used, wherein at least one of the two station devices and the subscriber device is used.
Monitors different wavelengths for each optical transmission line connecting them.
In an optical transmission system provided with a means for transmitting and receiving signals , different optical transmission paths are used for the working system and the protection system.
The wavelength (λ 0 and λ 1 ) of the monitoring signal
Out of the optical wavelength band (λp) of the main signal transmitted through the path
Are set, and the two station devices transmit a monitoring signal on each optical transmission line.
With the subscriber unit according to the set wavelength.
Sending and receiving monitoring signals in both directions continuously regardless of the presence or absence of a signal
Communication means, wherein the subscriber unit has the two
The presence or absence of a main signal between the two station devices depending on the wavelength of
Continuously send and receive monitoring signals regardless of
An optical transmission system characterized by comprising means .
【請求項2】 前記監視信号は、監視用に設定された特
別なデータ信号である請求項記載の光伝送方式。
Wherein said supervisory signal, the optical transmission system according to claim 1, wherein a special data signal set for monitoring.
【請求項3】 前記監視信号を送受信する手段を備えた
加入者装置が複数であり、前記データ信号はその加入者
装置毎に識別できるように構成された請求項記載の光
伝送方式。
3. The optical transmission system according to claim 2 , wherein a plurality of subscriber units are provided with means for transmitting and receiving said monitoring signal, and said data signal is configured to be identifiable for each subscriber unit.
【請求項4】 前記加入者装置は、監視信号の送受信を
行う手段として現用系および予備系のそれぞれの光伝送
路の障害監視を行う二つの伝送路障害監視部を備え、 この二つの伝送路障害監視部は、それぞれ対応する伝送
路の障害を検出すると対応する局装置にその局装置との
間の監視信号の波長として設定された波長により監視信
号を送信する手段と、対応する局装置からその局装置と
の間の監視信号の波長として設定された波長の監視信号
を受信する手段と、受信した監視信号により伝送路障害
が発生したことを検出する手段とを含む 請求項1ないし3のいずれか記載の光伝送方式。
4. The subscriber unit is provided with two transmission line fault monitoring units for monitoring the failure of each of the active and standby optical transmission lines as means for transmitting and receiving a monitoring signal. The fault monitoring unit, when detecting a fault in the corresponding transmission line, transmits a monitoring signal to the corresponding station device at a wavelength set as a wavelength of the monitoring signal between the corresponding station device, and 4. A means for receiving a monitoring signal of a wavelength set as a wavelength of a monitoring signal with the station device, and means for detecting that a transmission path failure has occurred based on the received monitoring signal. The optical transmission system according to any of the above.
JP6127830A 1994-06-09 1994-06-09 Optical transmission system Expired - Fee Related JP2601193B2 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP6127830A JP2601193B2 (en) 1994-06-09 1994-06-09 Optical transmission system

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP6127830A JP2601193B2 (en) 1994-06-09 1994-06-09 Optical transmission system

Publications (2)

Publication Number Publication Date
JPH07336296A JPH07336296A (en) 1995-12-22
JP2601193B2 true JP2601193B2 (en) 1997-04-16

Family

ID=14969725

Family Applications (1)

Application Number Title Priority Date Filing Date
JP6127830A Expired - Fee Related JP2601193B2 (en) 1994-06-09 1994-06-09 Optical transmission system

Country Status (1)

Country Link
JP (1) JP2601193B2 (en)

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6362905B1 (en) 1997-02-24 2002-03-26 Hitachi, Ltd. Optical crossconnect apparatus and optical transmission system
JP3440872B2 (en) 1999-05-07 2003-08-25 日本電気株式会社 Supervisory signal transfer device in optical transmission system
JP2007173943A (en) * 2005-12-19 2007-07-05 Fujitsu Ltd Optical submarine transmission system
JP5863750B2 (en) * 2013-11-01 2016-02-17 ミハル通信株式会社 Broadcast system and center device

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS58205341A (en) * 1982-05-26 1983-11-30 Nec Corp Remote switching control system
JPH04115725A (en) * 1990-09-06 1992-04-16 Toshiba Corp Communication transmission system

Also Published As

Publication number Publication date
JPH07336296A (en) 1995-12-22

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