JPH03112235A - Looping back system for optical loop type transmission line - Google Patents
Looping back system for optical loop type transmission lineInfo
- Publication number
- JPH03112235A JPH03112235A JP1251512A JP25151289A JPH03112235A JP H03112235 A JPH03112235 A JP H03112235A JP 1251512 A JP1251512 A JP 1251512A JP 25151289 A JP25151289 A JP 25151289A JP H03112235 A JPH03112235 A JP H03112235A
- Authority
- JP
- Japan
- Prior art keywords
- loopback
- connection
- transmitting
- circuit
- transmission line
- 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
Links
- 230000005540 biological transmission Effects 0.000 title claims abstract description 23
- 230000003287 optical effect Effects 0.000 title claims description 16
- 238000012544 monitoring process Methods 0.000 claims abstract description 17
- 239000013307 optical fiber Substances 0.000 claims description 16
- 238000000034 method Methods 0.000 claims description 3
- 238000009434 installation Methods 0.000 claims description 2
- 238000006243 chemical reaction Methods 0.000 abstract description 9
- 238000003780 insertion Methods 0.000 abstract description 4
- 230000037431 insertion Effects 0.000 abstract description 4
- 230000001681 protective effect Effects 0.000 abstract 1
- 238000010586 diagram Methods 0.000 description 4
- 230000006866 deterioration Effects 0.000 description 2
- 230000001459 mortal effect Effects 0.000 description 2
- 239000004229 Alkannin Substances 0.000 description 1
- 101100501250 Caenorhabditis elegans elo-3 gene Proteins 0.000 description 1
- 230000007423 decrease Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
Landscapes
- Small-Scale Networks (AREA)
Abstract
Description
【発明の詳細な説明】
〔産業上の利用分野〕
本発明は、現用系及び予備系の二重化した光ファイバー
ケーブルで複数のデータ伝送装置をループ接続した光ル
ープ式伝送路において、伝送障害発生時に障害箇所を切
放すようループバック接続するための光ループ′式伝送
路のルーブハックカＪ（に関するものである。Detailed Description of the Invention [Industrial Field of Application] The present invention is directed to an optical loop type transmission line in which a plurality of data transmission devices are loop-connected using a redundant optical fiber cable for a working system and a backup system. This relates to a loop hacker J (optical loop type transmission line) for loopback connection so as to cut out a point.
第２は従来の光ループ式伝送路のループバック方式を例
示するブロック図である。監視回路５及び６はそれぞれ
、現用系及び予備系光ファイバーケーブル１０及び１１
からの受信レベルが規定のしきい値よりも低下してない
か監視し、規定値よりも低下した場合にループバック信
号をループバック切換回路１２へ送出する。正常時すな
わち監視回路５及び６がいずれもループバック信号を送
出していない場合には、ループバック切換回路１２は、
光−１，ｕ気変換回路（０／Ｅ）ｌ及び電気光変換回路
（Ｅｌｏ）２をそれぞれ分岐挿入部９の受信端に接続し
、また、Ｅｌｏ３及びＯ／Ｅ ４を直接接続させている
。受信レベル低下により′１ｉｉｉｉ視回ｌｉ＋８５が
ループバック信号を送出し始めると、ループバック切換
回路１２はそれに即応して０／Ｅ１ど分岐挿入部９の受
信端との接続を切載し、０／Ｅ４と分岐挿入部９の受信
端とを接続させて、ループバック接続を行なう。このル
ープバック接続の間に受信レベルが復旧して監視回路５
からのループバック信号が停止すると、これに即応して
ループバック切換回路１２は正常時の接続に復旧させる
。The second is a block diagram illustrating a conventional loopback system of an optical loop type transmission line. Monitoring circuits 5 and 6 are connected to active and backup optical fiber cables 10 and 11, respectively.
It monitors whether the reception level from the input terminal has fallen below a specified threshold value, and sends a loopback signal to the loopback switching circuit 12 when the reception level has fallen below the specified value. In normal conditions, that is, when neither of the monitoring circuits 5 and 6 is sending out a loopback signal, the loopback switching circuit 12
Optical-1, U-air conversion circuit (0/E) 1, and electro-optical conversion circuit (Elo) 2 are connected to the receiving end of branch/add section 9, and Elo 3 and O/E 4 are directly connected. . When the '1iii li+85 begins to send out a loopback signal due to a drop in the reception level, the loopback switching circuit 12 immediately responds to this by cutting off the connection with the receiving end of the branch/insertion section 9 such as 0/E1. A loopback connection is made by connecting E4 and the receiving end of the branch/add section 9. During this loopback connection, the reception level is restored and the monitoring circuit 5
When the loopback signal from the terminal stops, the loopback switching circuit 12 immediately responds to this by restoring the normal connection.
上述した従来の光ループ式伝送路のループバック方式に
おいては、光伝送路からの受信レベルが規定値よりも低
下するのに即応してループバック接続し、また規定値以
上に復旧するのに即応してループバック接続を解除して
いるので、光伝送路のモータルノイスや光素子の劣化に
より受信レベルがしきい値を上下してループバック信号
の発生と停止とが交互にくり返す状態になると、ループ
バック接続とその解除とが交互にくり返されてシスデム
接続が安定しないという欠点がある。In the loopback method of the conventional optical loop transmission line described above, a loopback connection is made immediately when the reception level from the optical transmission line drops below a specified value, and a loopback connection is made immediately when the reception level from the optical transmission line drops below the specified value. Since the loopback connection is canceled when the reception level rises and falls above the threshold due to mortal noise in the optical transmission line or deterioration of the optical element, the loopback signal is generated and stopped alternately. However, there is a drawback that the loopback connection and its release are repeated alternately, making the system connection unstable.
本発明のループバック方式は、第１及び第２の光ファイ
バーケーブルをもつ二重化ループ形式の伝送路と、それ
ぞれ該伝送路の途中に接続して信号を送受信するための
複数の送受信手段と、前記伝送路の各前記送受信手段の
設置箇所における前記第１及び第２の光ファイバーケー
ブルからの受信レベルをそれぞれ監視して予め設定した
しきい値よりも低下するとループバック信号を送出する
第１及び第２の監視手段と、該第１及び第２の監視手段
がいずれも前記ループバック信号を送出していないとき
には前記第１及び第・２の光ファイバーケーブルの一方
の途中に前記送受信手段を正常接続し、該第１及び第２
の監視手段の一方か前記ループバック信号を送出し始め
たときにはこれに即応して前記第１及び第２の光ファイ
バーケーブルの間に前記送受信手段をループバック接続
し、該ループバック接続の期間中に前記ループバック信
号が停止したときには予め定めた時間だけ該ループバッ
ク接続を保持したあとなお前記ループバツク信号か停止
したままならば前記正常接続に復帰させる接続制御手段
とを、備えている。The loopback method of the present invention includes a duplex loop-type transmission path having first and second optical fiber cables, a plurality of transmitting/receiving means connected in the middle of the transmission path for transmitting and receiving signals, and the transmission path. The first and second optical fiber cables monitor the reception level from the first and second optical fiber cables at each installation location of the transmission/reception means on the road, and transmit a loopback signal when the reception level falls below a preset threshold. When neither the monitoring means nor the first and second monitoring means are sending out the loopback signal, the transmitting/receiving means is normally connected in the middle of one of the first and second optical fiber cables; 1st and 2nd
When one of the monitoring means starts transmitting the loopback signal, in response to this, the transmitting/receiving means is loopback connected between the first and second optical fiber cables, and during the period of the loopback connection. The apparatus further includes connection control means for maintaining the loopback connection for a predetermined period of time when the loopback signal stops, and then restoring the normal connection if the loopback signal remains stopped.
次に、本発明について図面を参照して説明する。 Next, the present invention will be explained with reference to the drawings.
第１図は本発明の一実施例を示すフロック図である。」
１位ノートから現用系光ファイバーケーブル１０を通っ
て到来する光信号は、光−電気変換回路（０／Ｅ）１で
電気信号に変換された後、監視回路５及びループバック
切換回路８へ送られる。FIG. 1 is a block diagram showing one embodiment of the present invention. ”
The optical signal arriving from the first place note through the active optical fiber cable 10 is converted into an electrical signal by the optical-to-electrical conversion circuit (0/E) 1, and then sent to the monitoring circuit 5 and the loopback switching circuit 8. .
また、下位ノードから予備系光ファイバーケーブル１１
を通って到来する光信号は、光−電気変換回路（０／Ｅ
）４で電気信号に変換されて、監視回路６及びループバ
ック切換回路８に入力される。Also, from the lower node to the backup optical fiber cable 11
The optical signal arriving through the optical-to-electrical conversion circuit (0/E
) 4 into an electrical signal, which is input to a monitoring circuit 6 and a loopback switching circuit 8.
監視回路５及び６はそれぞれ、入力レベルが規定のしき
い値よりも低下していないかを監視し、入力レベルが規
定値よりも低下した場合にループバック信号をループバ
ック制御回路へ送出する。正常時すなわち監視回路５及
び６かループバック信号を送出していない場合には、ル
ープバック制御回路７は、０／Ｅ ］の出力信号を分岐
挿入部９の受信端へ、分岐挿入部９の送信端からの送信
信号を電気−光変換回路（Ｅｌｏ）２へそれぞれ接続し
、またＯ／Ｅ４の出力信号を電気−光変換回路（Ｅｌｏ
）３へ接続するよう、ループバック切換回路８に接続制
御用信号を送出する。受信レベル低下により監視回路５
（または６）がループバック信号を送出し始めると、ル
ープバック制御回路７はこれに即応して、０／Ｅ１と分
岐挿入部９の受信端との間（または０／Ｅ４とＥ１０３
との間）の接続を切り、０／Ｅ４と分岐挿入部９の受信
端との間（または分岐挿入部９の送信端とＥｌｏ ３と
の間）を接続するよう、ループバック切換回路８に接続
制御用信号を与えて、ループバック接続を行なう。この
あと、受信レベルが規定値以上に復旧し正常状態に戻る
と、ループバック制御回路７へのループバック信ｔツか
途Ｕ」れるが、ループバック制御回路７はこれに即応せ
ず、予め設定した長さの保護期間だけループバック接続
を保持させたあと、なおループバック信号か途切れたま
まならはループバック接続を解除して正常時の接続に復
旧させる。Monitoring circuits 5 and 6 each monitor whether the input level has fallen below a specified threshold, and send a loopback signal to the loopback control circuit when the input level has fallen below the specified value. In normal operation, that is, when the monitoring circuits 5 and 6 are not sending out loopback signals, the loopback control circuit 7 sends the output signal of 0/E to the receiving end of the drop/add section 9. The transmission signals from the transmitting end are connected to the electric-to-optical conversion circuit (Elo) 2, and the output signal of O/E4 is connected to the electric-to-optical conversion circuit (Elo).
) 3, a connection control signal is sent to the loopback switching circuit 8. Monitoring circuit 5 due to a drop in reception level.
(or 6) begins to send out a loopback signal, the loopback control circuit 7 immediately responds to the loopback signal between 0/E1 and the receiving end of the add/drop unit 9 (or between 0/E4 and E103).
The loopback switching circuit 8 is configured to cut the connection between the Apply a connection control signal to perform a loopback connection. After this, when the reception level recovers to the specified value or higher and returns to the normal state, the loopback signal to the loopback control circuit 7 is interrupted, but the loopback control circuit 7 does not respond to this immediately, but After the loopback connection is maintained for the set protection period, if the loopback signal is still interrupted, the loopback connection is canceled and the normal connection is restored.
以上説明したように本発明は、伝送路からの受信レベル
が低下しループバック接続した状態で受信レベルか復旧
した際のループバックの解除を時定数をもって行うこと
により、光伝送路のモータルノイズや光素子の劣化によ
り受信レベルがしきい値近傍で上下してループバック信
号の発生と停止とが交互にくり返す状態になっても、ル
ープバック状態を保持させて、システム接続を安定化で
きるという効果がある。As explained above, the present invention eliminates the mortal noise of the optical transmission line by canceling the loopback with a time constant when the reception level from the transmission line decreases and the reception level recovers with loopback connection. Even if the reception level rises and falls near the threshold due to optical element deterioration, causing the loopback signal to alternately occur and stop, the loopback state can be maintained and the system connection can be stabilized. effective.
第１図は本発明の一実施例を示すブロック図、第２図は
従来方式を示すフロック図である。
１．４・・・光−電気変換回路（０／Ｅ＞、２．３・・
・電気−光変換回路（Ｅｌｏｈ ５．６・・・監視回路
、７・・ループバック制御回路、８・・・ループバック
切換回路、９・分岐挿入部、１０・・・現用系光ファイ
バーケーブル、
１・・予備系光ファイハーゲ
ープル。FIG. 1 is a block diagram showing an embodiment of the present invention, and FIG. 2 is a block diagram showing a conventional system. 1.4... Optical-electric conversion circuit (0/E>, 2.3...
・Electricity-optical conversion circuit (Eloh 5.6... Monitoring circuit, 7... Loopback control circuit, 8... Loopback switching circuit, 9... Branch insertion part, 10... Working optical fiber cable, 1 ...Preliminary optical fiber gear.
Claims (2)
化ループ形式の伝送路と、それぞれ該伝送路の途中に接
続して信号を送受信するための複数の送受信手段と、前
記伝送路の各前記送受信手段の設置箇所における前記第
１及び第２の光ファイバーケーブルからの受信レベルを
それぞれ監視して予め設定したしきい値よりも低下する
とループバック信号を送出する第１及び第２の監視手段
と、該第１及び第２の監視手段がいずれも前記ループバ
ック信号を送出していないときには前記第１及び第２の
光ファイバーケーブルの一方の途中に前記送受信手段を
正常接続し、該第１及び第２の監視手段の一方が前記ル
ープバック信号を送出し始めたときにはこれに即応して
前記第１及び第２の光ファイバーケーブルの間に前記送
受信手段をループバック接続し、該ループバック接続の
期間中に前記ループバック信号が停止したときには予め
定めた時間だけ該ループバック接続を保持したあとなお
前記ループバック信号が停止したままならば前記正常接
続に復帰させる接続制御手段とを、備えていることを特
徴とする光ループ式伝送路のループバック方式。(1) A duplex loop type transmission line having first and second optical fiber cables, a plurality of transmitting/receiving means connected in the middle of the transmission line to transmit and receive signals, and each of the transmitting/receiving means of the transmission line. first and second monitoring means that respectively monitor reception levels from the first and second optical fiber cables at the installation location of the means and send out a loopback signal when the levels fall below a preset threshold; When neither the first nor second monitoring means is transmitting the loopback signal, the transmitting/receiving means is normally connected in the middle of one of the first and second optical fiber cables, and When one of the monitoring means starts transmitting the loopback signal, in response to this, the transmitting/receiving means is loopback connected between the first and second optical fiber cables, and during the period of the loopback connection, the The device is characterized by comprising connection control means for maintaining the loopback connection for a predetermined period of time when the loopback signal stops, and then restoring the normal connection if the loopback signal remains stopped. A loopback method for optical loop transmission lines.
前記第１及び第２の光ファイバーケーブルに光信号と電
気信号との相互変換手段を接続して、前記第１及び第２
の監視手段、前記接続制御手段、及び前記送受信手段と
電気信号を授受するようにした請求項（１）記載の光ル
ープ式伝送路のループバック方式。(2) A means for mutually converting optical signals and electrical signals is connected to the first and second optical fiber cables at locations where the transmitting/receiving means are installed on the transmission path,
2. A loopback system for an optical loop transmission line according to claim 1, wherein electrical signals are exchanged with the monitoring means, the connection control means, and the transmitting/receiving means.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1251512A JPH03112235A (en) | 1989-09-26 | 1989-09-26 | Looping back system for optical loop type transmission line |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1251512A JPH03112235A (en) | 1989-09-26 | 1989-09-26 | Looping back system for optical loop type transmission line |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH03112235A true JPH03112235A (en) | 1991-05-13 |
Family
ID=17223918
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP1251512A Pending JPH03112235A (en) | 1989-09-26 | 1989-09-26 | Looping back system for optical loop type transmission line |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH03112235A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPWO2006035481A1 (en) * | 2004-09-27 | 2008-05-15 | 三菱電機株式会社 | Optical wavelength add / drop device and failure recovery method |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS6251852A (en) * | 1985-08-31 | 1987-03-06 | Toshiba Electric Equip Corp | Transmission line switching device |
| JPS62243443A (en) * | 1986-04-16 | 1987-10-23 | Mitsubishi Electric Corp | Duplex system loop form data transmission |
| JPH01212045A (en) * | 1988-02-18 | 1989-08-25 | Nec Corp | Loop type optical transmitter |
-
1989
- 1989-09-26 JP JP1251512A patent/JPH03112235A/en active Pending
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS6251852A (en) * | 1985-08-31 | 1987-03-06 | Toshiba Electric Equip Corp | Transmission line switching device |
| JPS62243443A (en) * | 1986-04-16 | 1987-10-23 | Mitsubishi Electric Corp | Duplex system loop form data transmission |
| JPH01212045A (en) * | 1988-02-18 | 1989-08-25 | Nec Corp | Loop type optical transmitter |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPWO2006035481A1 (en) * | 2004-09-27 | 2008-05-15 | 三菱電機株式会社 | Optical wavelength add / drop device and failure recovery method |
| JP4545756B2 (en) * | 2004-09-27 | 2010-09-15 | 三菱電機株式会社 | Optical wavelength add / drop device and failure recovery method |
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