JPS62194753A - Optical local area network - Google Patents

Optical local area network

Info

Publication number
JPS62194753A
JPS62194753A JP61037030A JP3703086A JPS62194753A JP S62194753 A JPS62194753 A JP S62194753A JP 61037030 A JP61037030 A JP 61037030A JP 3703086 A JP3703086 A JP 3703086A JP S62194753 A JPS62194753 A JP S62194753A
Authority
JP
Japan
Prior art keywords
optical
equipment
switch
control signal
coupler
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.)
Pending
Application number
JP61037030A
Other languages
Japanese (ja)
Inventor
Iwao Eguchi
江口 巌
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 JP61037030A priority Critical patent/JPS62194753A/en
Publication of JPS62194753A publication Critical patent/JPS62194753A/en
Pending legal-status Critical Current

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  • Small-Scale Networks (AREA)
  • Optical Communication System (AREA)

Abstract

PURPOSE:To operate an optical local area network by providing an optical coupler and a control signal detector, supervising normally a command from a central equipment and excluding a failed terminal station equipment automatically. CONSTITUTION:If a terminal equipment supervised by a central equipment 7 is failed, a bypass mode command signal from the equipment 7 is inputted to a control signal detector 5 via an optical coupler 1 and an optical receiver 3 through an optical fiber cable and a changeover instruction of an optical switch 2 and a power interruption instruction of the equipment 6 are outputted. A switch 2 is connected to the output side of the coupler 1 and the network is in the bypass mode where the equipment 6 is disconnected. When the fault of the equipment 6 restores, a bypass mode release command is outputted by the equipment 7 and the detector 5 releases the switch 2.

Description

【発明の詳細な説明】 〔産業上の利用分野〕 本発明は光ローカルエリアネットワークに関し、特に端
局装置故障時のバイパス機能を有する光ローカルエリア
ネットワークに関する。
DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to an optical local area network, and more particularly to an optical local area network having a bypass function in the event of a terminal equipment failure.

[従来の技術〕 ループ状の光ロー力ルエリアネ・yトワークは第2図に
示すように端局装置12A〜12Nとこの端局装置間の
信号を制御するための中央装置11とが光ファイバーケ
ーブル100・100A〜100Nによりループ状に接
続されている。このように構成された光ロー力ルエリア
ネ・・Iトワークにおいて、従来一つの端局装置が故障
した場合の対策として、第3図に示すように光ファイバ
ーケーブル201・202の間に光スイ・ソチ22A・
22Bとを介して端局装置21に接続され、さらに先フ
ァイバーケーブルはいくつかの端局装置を通して中央装
置23に接続されるように構成されていた。即ち、端局
装置12が故障した場合、端局装置の入出力に設け°ら
れた光スイ・ソチ22A・22Bを通して、故障した端
局装置をバイパスし、故障が復帰した時再び光ス・f・
ソチ21A・21F3をもとに戻し、端局装置12を動
作させていた。
[Prior Art] As shown in FIG. 2, in a loop-shaped optical fiber network, terminal stations 12A to 12N and a central unit 11 for controlling signals between the terminal stations are connected to an optical fiber cable 100. - Connected in a loop by 100A to 100N. In the optical fiber network constructed in this manner, as a countermeasure in the event that one of the terminal equipment fails, as shown in FIG.・
22B to the terminal equipment 21, and the end fiber cable was further configured to be connected to the central equipment 23 through several terminal equipment. That is, when the terminal equipment 12 fails, the failed terminal equipment is bypassed through the optical switches 22A and 22B provided at the input and output of the terminal equipment, and when the fault is restored, the optical switch 22A and 22B are installed again.・
Sochi 21A and 21F3 were returned to their original positions and the terminal equipment 12 was operating.

光スイッチ22A・22Bをバイパスモードにするには
、通常は端局装置の電源を切ることにより行われる。
The optical switches 22A and 22B are normally put into bypass mode by turning off the power to the terminal equipment.

r発明が解決しようとする問題点〕 このように構成された従来の光ローカルエリアオ・・ニ
ア トワークにおいて、端局装置12A〜12Nの故障
を復帰させるには光スイ・ソチ2がバイパスモードにな
っているため、中央装置からの制御が光ケーブルを介し
て行うことができない。従って光ケーブルのほかに制御
用のラインを光スイッチと中央装置との間に設けるか、
人手を介して端局装置の電源を投入し、これにより光ス
イ・・Iチを制御することになる。しかし、制御用のラ
インを別に設けることは単一ケーブルで接続されている
光ロー力ルエリアネッ■・ワークの利点を著しく損なう
ことになり、また人手を介することは人工衛星搭載用な
ど無人運用を考慮した場合には不可能となる。
[Problems to be Solved by the Invention] In the conventional optical local area network configured as described above, in order to recover from a failure in the terminal equipment 12A to 12N, the optical switch Sochi 2 must be placed in bypass mode. Therefore, control from the central device cannot be performed via optical cables. Therefore, in addition to the optical cable, a control line should be installed between the optical switch and the central device, or
The terminal equipment is powered on manually, and the optical switches are thereby controlled. However, providing a separate line for control will significantly impair the advantages of optical low-power area networks connected by a single cable, and requiring human intervention is a consideration for unmanned operations such as those installed on artificial satellites. If you do, it will be impossible.

〔問題点を解決するための手段〕[Means for solving problems]

本発明の光ロー力ルエリアネッI・ワークは、光ファイ
バーケーブルによりループ状に接続された1個の中央装
置と少なくとも1個の端局装置とを有する光ロー力ルエ
リアネ・ソトワークにおいて、前記光ファイバーケーブ
ルから供給される信号を分岐して出力する光結合器と、
前記端局装置の故障信号を受信して光スイッチを制御す
る制御信号検出器と、前記制御信号検出器の制御により
光に変換された前記端局装置の出力を前記光結合器の出
力に切換えて前記光ファイバーケーブルに出力する光ス
イ・ソチとを備えて構成される。
The optical low power Lueria network I network of the present invention is an optical low power Lueria network I network having one central unit and at least one terminal unit connected in a loop by an optical fiber cable, the optical low power Lueria network I network is provided with an optical fiber cable. an optical coupler that branches and outputs the signal to be output;
a control signal detector that receives a failure signal from the terminal device and controls an optical switch; and a control signal detector that switches the output of the terminal device converted into light to the output of the optical coupler under the control of the control signal detector. and an optical switch for outputting to the optical fiber cable.

(実施例) 本発明について実施例を示す図面を参照してその構成と
作動を詳細に説明する。
(Example) The structure and operation of the present invention will be described in detail with reference to drawings showing examples.

第1図は本発明の一実施例の構成を示すプロ・ツク図で
ある。本実施例は光結合器1と、光スイ・ソチ2と、光
受信器3と、光送信器4と、制御信号検出器5と、端局
装置6と・、中央装置7とを備えている。
FIG. 1 is a block diagram showing the configuration of one embodiment of the present invention. This embodiment includes an optical coupler 1, an optical switch 2, an optical receiver 3, an optical transmitter 4, a control signal detector 5, a terminal device 6, and a central device 7. There is.

光ファイバーケーブルを介して光結合器1に入力された
光信号は、2つに分岐され1つは光スーfッチ2に他方
は光受信器3に入力される。光受信器3では入力された
光信号が電気信号に変換され端局装置6に受信信号を供
給する。端局装置6で処理された信号は、光送信器4で
電気信号から光信号に変換され光スイッチ2を介して出
力される。
An optical signal input to the optical coupler 1 via the optical fiber cable is branched into two, one input to the optical switch 2 and the other input to the optical receiver 3. The optical receiver 3 converts the input optical signal into an electrical signal and supplies the received signal to the terminal device 6 . The signal processed by the terminal device 6 is converted from an electrical signal to an optical signal by the optical transmitter 4 and outputted via the optical switch 2.

通常状態では、光スイッチ2は光送信器4側に接続され
ており、光結合器lで分岐された信号は切り離されてい
る。中央袋17に監視されている端局装置6が故障する
と、中央装置7からのバイパスモード指令信号が光ファ
イバーケーブルを通り光結合器1と光受信器3とを介し
て制御信号検出器5に入力され、光スイッチ2の切換え
命令と端局装置の電源断命令とが出される。これにより
光る・イッチ2は光結合器1の出力側に接続され、ネ・
ソトワークは故障した端局装置を切り離したベイバスモ
ードとなる。次に、端局装置の故障が復旧゛ すると中
央装置によりバイパスモード解除指令が出され、光結合
器1および光受信器3を介してこの指令を受信した制御
信号検出器5により光スイッチ2をもとに切り替えて光
送信器の出力を光ファイバーケーブルへ送出する。
In a normal state, the optical switch 2 is connected to the optical transmitter 4 side, and the signal branched by the optical coupler l is separated. When the terminal equipment 6 monitored by the central bag 17 breaks down, a bypass mode command signal from the central equipment 7 is input to the control signal detector 5 via the optical coupler 1 and the optical receiver 3 through the optical fiber cable. Then, a switching command for the optical switch 2 and a power-off command for the terminal equipment are issued. As a result, the light switch 2 is connected to the output side of the optical coupler 1, and the light switch 2 is connected to the output side of the optical coupler 1.
Sotowork becomes a bay bus mode in which the failed terminal equipment is disconnected. Next, when the failure of the terminal equipment is recovered, the central equipment issues a command to cancel the bypass mode, and the control signal detector 5, which receives this command via the optical coupler 1 and the optical receiver 3, activates the optical switch 2. The output of the optical transmitter is sent to the optical fiber cable.

〔発明の効果〕〔Effect of the invention〕

以上説明したように本発明は光結合器と制御信号検出器
を設けることにより中央装置からの指令を常時監視でき
るので、故障した端局装置を自動的に排除して光ロー力
ルエリアネ・ソトワークを作動せしめ故障が復旧したと
きは端局装置が復帰できるという効果がある。
As explained above, the present invention can constantly monitor commands from the central device by providing an optical coupler and a control signal detector, so it can automatically eliminate a malfunctioning terminal device and eliminate optical rollout and sotowork. This has the effect that the terminal equipment can be restored when the activation failure is recovered.

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

第1図は本発明の一実施例の構成を示すプロ、・リフ図
、第2図は光ロー力ルエリアネ・ソトワークの概要の構
成を示すブロック図、第3図は従来の技術の一例の構成
を示すブロック図。 1・・・・・・光結合器、2・・・・・・光スイッチ、
3・・・・・・光受信器、4・・・・・・光送信器、5
・・・・・・制御信号検出器。 6・・・・・・端局装置、7・・・・・・中央装置。 第 2 閉 茅 3 図
Fig. 1 is a professional diagram showing the configuration of an embodiment of the present invention, Fig. 2 is a block diagram showing the general configuration of an optical low power Lueriane sotowork, and Fig. 3 is a configuration of an example of the conventional technology. Block diagram showing. 1... Optical coupler, 2... Optical switch,
3... Optical receiver, 4... Optical transmitter, 5
・・・・・・Control signal detector. 6...Terminal device, 7...Central device. Part 2 Closing 3 Fig.

Claims (1)

【特許請求の範囲】[Claims] 光ファイバーケーブルによりループ状に接続された1個
の中央装置と少なくとも1個の端局装置とを有する光ロ
ーカルエリアネットワークにおいて、前記光ファイバー
ケーブルから供給される信号を分岐して出力する光結合
器と、前記端局装置の故障信号を受信して光スイッチを
制御する制御信号検出器と、前記制御信号検出器の制御
により光に変換された前記端局装置の出力を前記光結合
器の出力に切換えて前記光ファイバーケーブルに出力す
る前記光スイッチとを備えてなることを特徴とする光ロ
ーカルエリアネットワーク。
In an optical local area network having one central device and at least one terminal device connected in a loop by an optical fiber cable, an optical coupler that branches and outputs a signal supplied from the optical fiber cable; a control signal detector that receives a failure signal from the terminal device and controls an optical switch; and a control signal detector that switches the output of the terminal device converted into light to the output of the optical coupler under the control of the control signal detector. and the optical switch that outputs the signal to the optical fiber cable.
JP61037030A 1986-02-20 1986-02-20 Optical local area network Pending JPS62194753A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP61037030A JPS62194753A (en) 1986-02-20 1986-02-20 Optical local area network

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP61037030A JPS62194753A (en) 1986-02-20 1986-02-20 Optical local area network

Publications (1)

Publication Number Publication Date
JPS62194753A true JPS62194753A (en) 1987-08-27

Family

ID=12486238

Family Applications (1)

Application Number Title Priority Date Filing Date
JP61037030A Pending JPS62194753A (en) 1986-02-20 1986-02-20 Optical local area network

Country Status (1)

Country Link
JP (1) JPS62194753A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0635950A1 (en) * 1993-07-22 1995-01-25 Nortel Networks Corporation Branching unit for telecommunications optical cable systems

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0635950A1 (en) * 1993-07-22 1995-01-25 Nortel Networks Corporation Branching unit for telecommunications optical cable systems

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