JPH07336296A - Optical transmission system - Google Patents

Optical transmission system

Info

Publication number
JPH07336296A
JPH07336296A JP6127830A JP12783094A JPH07336296A JP H07336296 A JPH07336296 A JP H07336296A JP 6127830 A JP6127830 A JP 6127830A JP 12783094 A JP12783094 A JP 12783094A JP H07336296 A JPH07336296 A JP H07336296A
Authority
JP
Japan
Prior art keywords
optical transmission
optical
signal
transmission line
subscriber
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
Application number
JP6127830A
Other languages
Japanese (ja)
Other versions
JP2601193B2 (en
Inventor
Hiroshi Nakaishi
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

Abstract

PURPOSE:To monitor a standby transmission line at all times even when the optical transmission line between an office device and a star coupler has in-use and standby redundant constitution by sending and receiving light signals which are different in wavelength by an in-use system and a standby system between the office device and a subscriber device and detecting a fault. CONSTITUTION:This system is equipped with a system-0 office device 1-1, a system-1 office device 1-2, and (n) (n: natural number) subscriber devices 2-1 to 2-n; and one-terminal sides of optical transmission lines 5-1 and 5-2, and 9-1 to 9-n are connected to the input/output terminals of the office devices 1-1 and 1-2 and subscriber devices 2-1 to 2-n, and the other-end sides are mutually connected by the star coupler 3. Then monitor signal transmitting and receiving circuits 8 which send and receive monitor signals are installed between the office devices 1-1 and 1-2 and at least one of the subscriber devices. Then the office devices 1-1 and 1-2 and the optical transmission lines 5-1 and 5-2 connected thereto have the two redundant constitutions and the monitor signals are different in wavelength by the two optical transmission lines 5-1 and 5-2 of the redundant constitutions.

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 is a LAN
Suitable for use in (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 the input and output ends of many optical communication devices, and the other end of the optical transmission line is connected to each other by one (or a plurality) star coupler. In addition, an optical transmission system is known in which an optical signal can be transmitted from any optical communication device to any optical communication device. Such an optical transmission system is described as an example in Japanese Patent Laid-Open No. 32-32734. Assuming that one of the communication devices connected to each other by the star coupler is a station device and many other communication devices are subscriber devices, the one station device is the main communication network or the main information processing device. , The optical transmission system connected by this 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 device communicates with a main communication network or a main information processing device, a station device is used regardless of which subscriber device is a partner, so that a fixed standard is set as this LAN. In order to ensure the reliability of the above, it was considered that the station equipment was not made into one, but the working system and the standby system were equipped for redundancy. That is, two equivalent station devices are provided, and both station devices are connected to the star coupler, and even if one station device fails, the other station device is used, and the entire LAN is The aim is to reduce the occurrence of failures that make it 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 and an active system and a standby system are provided 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 block diagram of a conventional monitoring method for this purpose. This figure shows only the monitoring system by omitting 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。
This conventional optical transmission system includes a station device 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-.
A transmission line fault monitoring unit 10 is provided for each of the n.

【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 line fault monitoring unit 10 receives a transmission line fault monitoring data insertion unit 11 for inserting transmission line fault monitoring data, and an electric signal from the transmission line fault monitoring data insertion unit 11. An electrical / optical conversion circuit 12 that converts the optical signal of a certain wavelength and outputs the optical signal, and an optical transmission line 4-which allows the optical signal from the electrical / optical conversion circuit 12 to pass therethrough.
, 4-2 and 5-1, 5-2, ..., 5-n pass a WDM (wavelength division multiplexing) filter 13, and the optical signal from the WDM filter 13 into an electrical signal. The light / electricity conversion circuit 14 for converting the light / electricity
A transmission line fault detection unit 15 that receives a signal from the electrical conversion circuit 14 and detects a fault in the transmission line is included.

【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 for such a transmission line, even if the transmission line between the star coupler and the station device has a redundant configuration, Since the wavelength of the optical signal to be transmitted is not changed for each station device, the optical signals transmitted from a plurality of station devices may collide. Therefore, in order to avoid this optical signal collision, there is no choice but to perform time-divisional control in which only the transmission signal from the active system station device is transmitted and the transmission signal from the standby system station device is prohibited. In this case, the backup transmission line cannot be monitored every time the transmission signal from the backup system station device is prohibited,
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, and provides an optical transmission system capable of constantly monitoring the standby transmission line when the transmission line between the station device and the 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。
SUMMARY OF THE INVENTION The present invention comprises a station device, n
(N is a natural number) subscriber devices, and the station device and the subscriber device are connected at their input and output ends to one end of an optical transmission line, and at the other end of the optical transmission line by a star coupler. In the optical transmission system including means for transmitting and receiving a supervisory signal between the station device and at least one of the subscriber devices, the station device and the optical transmission line connected to the station device are plural in number. It has a redundant configuration, and the wavelength of the supervisory 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。
The plurality is 2, and the supervisory signal is continuously transmitted / received regardless of the presence or absence of the main signal of the corresponding optical transmission line, and the supervisory signal is transmitted between the station device and the n subscriber devices. With respect to the optical wavelength band (λp) of the main signal transmitted through the star coupler, the two wavelengths (λ 0 and λ 1 ) of the supervisory 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 is a special data signal set for monitoring. Desirably, a plurality of subscriber devices are provided with means for transmitting and receiving the supervisory signal, and the data signal can be identified for each subscriber device.

【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。
A fault is detected by transmitting and receiving an optical signal having a different wavelength for each of the active system and the standby system between the station device and the subscriber device. As a result, even if the optical transmission line between the station device and the star coupler has a working and standby redundant configuration, the standby transmission line can be constantly 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。
Embodiments of the present invention will now 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 the part of the monitoring system in the optical transmission system of 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 devices 2-1 to 2-1.
2-n and 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 (0 system) and a standby system (1 system), and the main signal of communication performed using this optical transmission system is the station device 1-
It is performed between one of the subscriber units 1 and 1-2 and the subscriber units 2-1 to 2-n. When there are n subscriber devices 2-1 to 2-n, and the n subscriber devices 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 are provided with main signal transmitting / receiving circuits 6-1 and 6-2, respectively. The main signal is carried here by the optical wavelength band λp. These two station devices 1-1 and 1-2 are always in the operating state at the same time, but one of the main signals is selected by the active system standby system switching device 7, and the main communication network or the main information processing (not shown) is performed. It is connected to the device. On the other hand, when a failure occurs in the active system, the standby system is immediately switched to. Since this switching control is not directly related to the present invention, detailed description thereof will be 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, an optical transmission line for connecting the station devices 1-1, 1-2 and the star coupler 3 to the two station devices 1-1, 1-2 is provided. A monitoring signal transmitting / receiving circuit 8 is provided for monitoring. The supervisory signal transmission / reception circuit 8 is provided with the other party to the subscriber apparatuses 2-1 to 2-n, and in this embodiment, it is bidirectional with the subscriber apparatuses 2-1 to 2-n. Monitoring signals are being transmitted and received.

【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 supervisory signal transmission / reception circuit 8 provided in the two station devices 1-1 and 1-2 are 0 system and 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 device 1-1 and the 1-system station device 1-2, and n (n is a natural number) subscriber devices 2-1.
To 2-n, the station devices 1-1 and 1-2 and the subscriber devices 2-1 to 2-n have optical transmission lines 5-1, 5-2 and 9- at their input and output ends, respectively. 1 to 9-n are connected to one end thereof, and optical transmission lines 5-1 and 5-2 and 9-1 to
The other ends of 9-n are connected to each other by a star coupler 3,
A supervisory signal transmitting / receiving circuit 8 for transmitting / receiving a supervisory signal between the station devices 1-1, 1-2 and at least one of the subscriber devices 2-1 to 2-n is provided, and the station devices 1-1, 1-2 and Optical transmission lines 5-1 and 5-connected to the station devices 1-1 and 1-2
2 has two redundant configurations, and the wavelength of the supervisory signal is different for each of the two redundantly configured optical transmission lines 5-1 and 5-2.

【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 supervisory signal corresponds to the corresponding optical transmission line 5-1,
5-2 and 9-1 to 9-n are continuously transmitted and received regardless of the presence / absence of main signals, and the station devices 1-1 and 1-2
And the n subscriber units 2-1 to 2-n are transmitted through the star coupler 3 to the optical wavelength band (λp) of the main signal, the two wavelengths (λ 0 of the supervisory signal). And λ 1 ) are set outside the optical wavelength band of the main signal. Further, the supervisory signal is transmitted from the station devices 1-1 and 1-2 to the subscriber devices 2-1 to 2-1.
2-n (downlink) and from the subscriber devices 2-1 to 2-n to the station devices 1-1 and 1-2 (uplink) bidirectionally, and the supervisory signal is a special signal set for surveillance. It is a data signal. Each of the subscriber devices 2-1 to 2-n is provided with a supervisory signal transmitting / receiving circuit for transmitting / receiving the supervisory signal, and the data signal is configured to be identified for each of the subscriber devices 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 is provided with a transmission line failure monitoring unit 10 that monitors the current transmission lines 5-1 and 5-2 to detect a failure, and further, the subscriber device 2 -1-
2-n, the 0-system transmission line fault monitoring unit 10a and the 1-system transmission line fault monitoring unit 10b, which monitor the transmission lines 5-1 and 5-2 for each system to detect an abnormality, and the optical transmission line 5-1. 5,
-2 receives optical signals having different wavelengths for each system and detects a failure, and transmits optical signals having different wavelengths for each system to the station device 1
Subscriber device star coupler 16 for transmitting every -1, 1-2
With.

【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。
Further, the transmission line fault monitoring unit 10 of the station devices 1-1 and 1-2, the 0-system transmission line fault monitoring unit 10a and the 1-system transmission line fault monitoring unit of the subscriber devices 2-1 to 2-n. The transmission line fault monitoring data insertion unit 11 for inserting fault monitoring data of the optical transmission line and the signal from the transmission line fault monitoring data insertion unit 11 are input to the optical transmission line 5-b.
An electrical / optical conversion circuit 12 that outputs an optical signal having a wavelength determined for each of the optical transmission lines 1 and 5-2, and a transmission line 5 that transmits the optical signal from the electrical / optical conversion circuit 12 and receives the optical signal. -1 and 5-2 WDM (wavelength division multiplexing) filter 13 that passes an optical signal of a wavelength determined for each
And an optical / electrical conversion circuit 14 for converting an optical signal from the WDM filter 13 into an electrical signal, and a failure of the optical transmission lines 5-1 and 5-2 is detected from the signal from the optical / electrical conversion circuit 14. The transmission path failure detection unit 15 is provided.

【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 constructed 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。
Transmission line fault monitoring data inserting section 11 of station device 1-1 inserts transmission line fault monitoring data into an optical signal transmitted, and electric / optical conversion circuit 12 determines the signal for each transmission line. The converted optical signal is transmitted to the WDM filter 13. The WDM filter 13 passes an optical signal having a wavelength determined for each of the transmission lines 5-1 and 5-2 among the received optical signals. The optical signal that has passed through the WDM filter 13 is
From the determined 0-system optical transmission line 5-1 or 1-system optical transmission line 5-2, it is sent to the star coupler 3 and branched, and one of the predetermined subscriber units 2-1 to 2-n, for example, the subscriber unit is added. It is sent to the worker 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 device 2-1, the subscriber device star coupler 16 receives the optical signal, and if it is received from the optical transmission line 5-1 of the 0 system, the 0 system transmission line fault monitoring section. 10a, and if it is received from the optical transmission line 5-2 of the 1-system, it is transmitted to the 1-system transmission line fault monitoring unit 10b.

【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 the optical / electrical conversion circuit 14 Send to. The optical / electrical conversion circuit 14 converts the signal into an electric signal and sends it to the transmission path failure detection unit 15. The transmission path failure detection unit 15 detects the 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 the transmission line fault monitoring data is inserted and transmitted in the signal transmitted by the transmission line fault monitoring data inserting unit 11 of the 1st system transmission line fault monitoring unit 10b in the subscriber unit 2-1. The electrical / optical conversion circuit 12 converts the signal into an optical signal determined for each transmission path, and the WDM filter 13
Send to. The WDM filter 13 allows the received optical signal to pass if it is transmitted through the transmission line 5-2, and the subscriber unit star coupler 16, the star coupler 3 and 1 are transmitted.
It 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 receives WD.
If the M filter 13 is an optical signal from the transmission line 5-2, it 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 failure detection unit 15. The transmission path failure detection unit 15 detects the 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。
By such an operation, even if the transmission line has a redundant configuration, it is possible to constantly monitor the failure of the 1-system transmission line, that is, the standby system transmission line.

【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.
Even in a redundant transmission line, there is an effect that the transmission line fault of the standby transmission can be constantly monitored.

【図面の簡単な説明】[Brief description of 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 and 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 working system standby system switching device 8 monitoring signal transmission / reception circuit 9-1 to 9-n optical transmission line 10 transmission line fault monitoring unit 10a 0 system transmission line fault monitoring unit 10b 1 system Transmission line fault monitoring unit 11 Transmission line fault monitoring data insertion unit 12 Electrical / optical conversion circuit 13 WDM filter 14 Optical / electrical conversion circuit 15 Transmission line fault detection unit 16 Subscriber device star coupler

Claims (6)

【特許請求の範囲】[Claims] 【請求項1】 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光
伝送方式。
1. A station device and n (n is a natural number) subscriber devices are provided, and the station device and the subscriber device are respectively connected at their input and output ends to one end of an optical transmission line. In the optical transmission system, wherein the other ends of the transmission lines are mutually connected by a star coupler, and a means for transmitting and receiving a supervisory signal between the station device and at least one of the subscriber devices is provided, the station device and the station device An optical transmission system characterized in that the optical transmission line connected to the optical fiber has a plurality of redundant configurations, and the wavelength of the supervisory signal is different for each of the plurality of redundant optical transmission lines.
【請求項2】 前記複数は2である請求項1記載の光伝
送方式。
2. The optical transmission system according to claim 1, wherein the plurality is two.
【請求項3】 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る請
求項2記載の光伝送方式。 【請求項3】 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(λ
0 およびλ1 )は前記主信号の光波長帯の外に設定され
た請求項2記載の光伝送方式。
3. The optical transmission system according to claim 2, wherein the supervisory signals are continuously transmitted and received regardless of the presence or absence of a main signal in the corresponding optical transmission line. 3. With respect to an optical wavelength band (λp) of a main signal transmitted via the star coupler between the station device and the n subscriber devices, two wavelengths of the supervisory signal ( λ
The optical transmission system according to claim 2, wherein 0 and λ 1 ) are set outside the optical wavelength band of the main signal.
【請求項4】 前記監視信号は前記局装置から前記加入
者装置におよび前記加入者装置から前記局装置について
双方向に伝送される請求項3記載の光伝送方式。
4. The optical transmission system according to claim 3, wherein the supervisory signal is transmitted bidirectionally from the station device to the subscriber device and from the subscriber device to the station device.
【請求項5】 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4記載の光伝送方式。
5. The optical transmission system according to claim 4, wherein the monitoring signal is a special data signal set for monitoring.
【請求項6】 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5記載の光
伝送方式。
6. The optical transmission system according to claim 5, wherein there are a plurality of subscriber devices equipped with the means for transmitting and receiving the supervisory signal, and the data signal can be identified for each subscriber device.
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 true JPH07336296A (en) 1995-12-22
JP2601193B2 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)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6909853B1 (en) 1999-05-07 2005-06-21 Nec Corporation Apparatus for transferring monitor signals in photo-transfer system
JP2007173943A (en) * 2005-12-19 2007-07-05 Fujitsu Ltd Optical submarine transmission system
US7272314B2 (en) 1997-02-24 2007-09-18 Hitachi, Ltd. Optical crossconnect apparatus and optical transmission system
JP2015089082A (en) * 2013-11-01 2015-05-07 ミハル通信株式会社 Broadcast system and center device

Citations (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

Patent Citations (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

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US7272314B2 (en) 1997-02-24 2007-09-18 Hitachi, Ltd. Optical crossconnect apparatus and optical transmission system
US6909853B1 (en) 1999-05-07 2005-06-21 Nec Corporation Apparatus for transferring monitor signals in photo-transfer system
JP2007173943A (en) * 2005-12-19 2007-07-05 Fujitsu Ltd Optical submarine transmission system
US7326916B2 (en) 2005-12-19 2008-02-05 Fujitsu Limited Optical submarine transmission system
JP2015089082A (en) * 2013-11-01 2015-05-07 ミハル通信株式会社 Broadcast system and center device

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