JPS6141182B2 - - Google Patents
Info
- Publication number
- JPS6141182B2 JPS6141182B2 JP55151189A JP15118980A JPS6141182B2 JP S6141182 B2 JPS6141182 B2 JP S6141182B2 JP 55151189 A JP55151189 A JP 55151189A JP 15118980 A JP15118980 A JP 15118980A JP S6141182 B2 JPS6141182 B2 JP S6141182B2
- Authority
- JP
- Japan
- Prior art keywords
- light emitting
- station
- emitting element
- monitoring
- optical
- 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
Links
- 230000003287 optical effect Effects 0.000 claims description 24
- 238000012544 monitoring process Methods 0.000 claims description 20
- 238000004891 communication Methods 0.000 claims description 11
- 230000006866 deterioration Effects 0.000 claims description 7
- 230000005540 biological transmission Effects 0.000 claims description 6
- 230000007613 environmental effect Effects 0.000 claims description 2
- 238000010586 diagram Methods 0.000 description 5
- 238000001514 detection method Methods 0.000 description 4
- 238000003780 insertion Methods 0.000 description 4
- 230000037431 insertion Effects 0.000 description 4
- 238000000034 method Methods 0.000 description 4
- 238000006243 chemical reaction Methods 0.000 description 3
- 238000012937 correction Methods 0.000 description 3
- 230000002950 deficient Effects 0.000 description 2
- 238000007493 shaping process Methods 0.000 description 2
Classifications
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B10/00—Transmission systems employing electromagnetic waves other than radio-waves, e.g. infrared, visible or ultraviolet light, or employing corpuscular radiation, e.g. quantum communication
- H04B10/07—Arrangements for monitoring or testing transmission systems; Arrangements for fault measurement of transmission systems
- H04B10/075—Arrangements for monitoring or testing transmission systems; Arrangements for fault measurement of transmission systems using an in-service signal
- H04B10/079—Arrangements for monitoring or testing transmission systems; Arrangements for fault measurement of transmission systems using an in-service signal using measurements of the data signal
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B10/00—Transmission systems employing electromagnetic waves other than radio-waves, e.g. infrared, visible or ultraviolet light, or employing corpuscular radiation, e.g. quantum communication
- H04B10/60—Receivers
- H04B10/66—Non-coherent receivers, e.g. using direct detection
- H04B10/69—Electrical arrangements in the receiver
- H04B10/693—Arrangements for optimizing the preamplifier in the receiver
- H04B10/6931—Automatic gain control of the preamplifier
Landscapes
- Physics & Mathematics (AREA)
- Electromagnetism (AREA)
- Engineering & Computer Science (AREA)
- Computer Networks & Wireless Communication (AREA)
- Signal Processing (AREA)
- Monitoring And Testing Of Transmission In General (AREA)
- Optical Communication System (AREA)
Description
【発明の詳細な説明】
本発明は光伝送路と劣化がおおむね予知出来る
光発光素子を有する監視制御局と複数のノード局
より構成される光通信ループネツトワークに係り
通常の障害監視方式の他に、各ノード局及監視制
御局において前局の光出力レベルを監視し光発光
素子が劣化し機能を失う前に検知し、予備の発光
素子が無くとも光発光素子の機能喪失による通信
障害を未然に防止出来る監視方式。DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an optical communication loop network consisting of an optical transmission line, a supervisory control station having a light emitting element whose deterioration can be generally predicted, and a plurality of node stations, and which uses a conventional fault monitoring system. In addition, each node station and supervisory control station monitors the optical output level of the previous station to detect before the light emitting device deteriorates and loses its function, and even if there is no spare light emitting device, it is possible to prevent communication failure due to loss of function of the light emitting device. A monitoring method that can prevent accidents.
光発光素子は経年変化により劣化する。このた
め重要回線では従来は現用予備方式を用い一方が
劣化すると他方に切替えて使用している。この方
式では予備の光発素子及切替制御回路が必要であ
る欠点があつた。又予備を持たない方式では発光
素子が機能を喪失するとループバツク方式でこの
障害箇所と次のノード間をループネツトワークよ
り除外するが、この間障害検出ノードと前局のノ
ードにも通信データに断点が生ずる欠点がある。 Light emitting elements deteriorate over time. For this reason, conventionally, important lines use a working backup system, and when one deteriorates, they are switched to the other. This method had the disadvantage of requiring a spare light emitting element and a switching control circuit. In addition, in a system that does not have a backup, when a light-emitting element loses its function, the loopback method excludes the area between this fault point and the next node from the loop network, but during this time there is also a break in communication data between the fault detection node and the previous node. There is a drawback that this occurs.
本発明の目的は上記の欠点を無くするために光
伝送路と光発光素子を有する監視制御局と複数の
ノード局より構成される光通信ループネツトワー
クにおいて各ノード局及監視制御局において前局
の光出力レベルを監視し機能喪失前に光発光素子
の劣化を検知し、予備の発光素子が無くとも、光
発光素子の機能喪失による通信障害を未然に防止
出来る監視方式の提供にある。 An object of the present invention is to eliminate the above-mentioned drawbacks by providing a pre-station at each node station and a supervisory control station in an optical communication loop network consisting of a supervisory control station having an optical transmission line and a light emitting element, and a plurality of node stations. To provide a monitoring system capable of monitoring the optical output level of a light emitting element, detecting deterioration of the light emitting element before it loses its function, and preventing communication failure due to loss of function of the light emitting element even without a spare light emitting element.
本発明は上記の目的を達成するために光伝送路
と劣化がおむね予知出来る光発光素子を有する監
視制御局と複複数のノード局より構成される光通
信ループネツトワークにおいて、通常の障害監視
方式の他に、各ノード局及び監視制御局において
光受信レべルを監視する受光素子の環境変化によ
り変化する特性を補正する手段を持つ光受信ベル
監視警報器を持ち前局の光出力レベルをノード局
及び監視制御局にて発光素子が劣化しているが機
能は喪失していないレベルを検出する閾値にて監
視し、該前局の光発光素子が劣化し機能を失う前
に検知し、警報信号を監視制御局に通知すること
を特徴とする監視方式である。 In order to achieve the above object, the present invention provides an optical communication loop network composed of a plurality of node stations and a supervisory control station having an optical transmission line and a light emitting element whose deterioration can be generally predicted. In addition to this system, each node station and supervisory control station is equipped with an optical reception bell monitoring alarm device that has a means of correcting characteristics that change due to environmental changes of the light receiving element that monitors the optical reception level. The node station and the monitoring control station monitor the light emitting element at a threshold value that detects the level at which the light emitting element has deteriorated but has not lost its function, and detects the light emitting element of the previous station before it deteriorates and loses its function, This is a monitoring method characterized by notifying a monitoring control station of an alarm signal.
以下本発明を図面に従つて説明する。 The present invention will be explained below with reference to the drawings.
第１図は監視制御局（以下SVと云う）と複数
のノード局（以下NDと云う）と伝送路よりなる
ループネツトワークの原理図、第２図は本発明の
実施例でNDにおける受信光電気変換回路のブロ
ツク構成図、第３図は本発明の監視用フレームフ
オーマツトの実施例である。 Figure 1 is a principle diagram of a loop network consisting of a supervisory control station (hereinafter referred to as SV), multiple node stations (hereinafter referred to as ND), and transmission lines, and Figure 2 is an example of the present invention, showing the received light at ND. FIG. 3, a block diagram of the electrical conversion circuit, is an embodiment of the monitoring frame format of the present invention.
図中SVは監視制御局、ND1〜ND4はノード局、
１は光受光部、２は増巾器、３は等化器、４は波
形整形部、５は自動利得調整回路、６は尖頭値検
出回路、７は光受信レベル監視部、８は光受信レ
ベル温度補正部、９は光発光素子劣化の場合の機
能喪失前のレベルを検出するため、あらかじめ定
めた閾値を持つ警報発生回路、１０は光信号入力
端子、１１は出力端子、１２は警報信号出力端
子、１３はノード局のアドレス挿入部、１４はレ
ベルアラームフラグ挿入部である。 In the figure, SV is a supervisory control station, ND 1 to ND 4 are node stations,
1 is a light receiving section, 2 is an amplifier, 3 is an equalizer, 4 is a waveform shaping section, 5 is an automatic gain adjustment circuit, 6 is a peak value detection circuit, 7 is an optical reception level monitoring section, 8 is an optical 9 is a reception level temperature correction unit; 9 is an alarm generating circuit having a predetermined threshold value in order to detect the level before loss of function in the case of deterioration of the light emitting element; 10 is an optical signal input terminal; 11 is an output terminal; 12 is an alarm A signal output terminal, 13 is a node station address insertion section, and 14 is a level alarm flag insertion section.
光通信に使用する光発光素子は経年変化により
劣化し機能を喪失するが、この出力レベルを監視
することによりあらかじめ機能喪失を、おおむね
検出出来る。本発明はこの特性を利用している。
前局のNDの発光素子が機能を喪失しない程度に
劣化するとこれを受信している当NDの受光素子
のレベルがわずかに下る。このわずかなレベル低
下を光受信レベル監視部７にて監視するわけであ
るが、受光素子は温度により特性が変化するので
温度補正回路８にてこれを補正している。又警報
発生回路９の警報を発する閾値ととしては光発光
素子が劣化はしているが機能は喪失しないレベル
にしておく。従つて受光素子のレベルが、或程度
光発光素子の劣化により下ると警報を出ることに
なる。この警報信号をSV局に送るわけである
が、これは監視用として常時出されているタイム
スロツトに第３図に示す如く自局アドレスを挿入
する部分１３とレベルアラームを挿入する部分１
４を１ビツト設け、これにより行う。SVではこ
れを取込みNDのどの局の光発素子が不良になつ
たかを発見する。以上はNDについて述べたがSV
においても同様である。 Light-emitting devices used in optical communications deteriorate over time and lose their functionality, but by monitoring their output levels, it is generally possible to detect loss of functionality in advance. The present invention takes advantage of this property.
When the light-emitting element of the previous station's ND deteriorates to the extent that it does not lose its function, the level of the light-receiving element of the current ND, which is receiving it, drops slightly. This slight drop in level is monitored by the optical reception level monitoring section 7, but since the characteristics of the light receiving element change depending on the temperature, this is corrected by the temperature correction circuit 8. The threshold value for issuing an alarm from the alarm generation circuit 9 is set to a level that allows the light emitting element to deteriorate but not lose its functionality. Therefore, if the level of the light receiving element falls to some extent due to deterioration of the light emitting element, an alarm will be issued. This alarm signal is sent to the SV station, which consists of a part 13 where the own station address is inserted into the time slot that is always issued for monitoring purposes, and a part 1 where the level alarm is inserted, as shown in Figure 3.
4 is provided as one bit, and this is used. The SV takes this information and discovers which station's light emitting element of the ND has become defective. The above was about ND, but SV
The same applies to
これにより光発光素子が機能を失う前に検知し
て適当な処置を行うことが可能であるので、光発
光素子の予備及び切替制御回路を特に持つ必要も
なく又不良光発光素子の取替えも適当な時に出来
るので通信障害をさけることが出来る。 As a result, it is possible to detect the light emitting element before it loses its function and take appropriate measures, so there is no need to have a spare and switching control circuit for the light emitting element, and defective light emitting elements can be replaced easily. This can be done at any time, so communication failures can be avoided.
本発明によればNDの光受信部に前局の光発光
素子の受信レベル検出回路を持ち光発光素子が劣
化し機能を喪失する前に検出出来るので、特に予
備の光発光素子及び切替制御回路を持つ必要がな
く又光発光素子の機能喪失による通信障害も防止
出来る効果がある。 According to the present invention, since the optical receiving section of the ND includes a reception level detection circuit for the light emitting element of the previous station, it is possible to detect the light emitting element before it deteriorates and loses its function. There is no need to hold the light emitting device, and communication failures due to loss of function of the light emitting device can also be prevented.
第１図はSVを複数のNDと伝送路よりなるルー
プネツトワークの原理図、第２図は本発明の実施
例のNDにおける受信光電気変換回路のブロツク
構成図、第３図は本発明の監視用フレームフオー
マツトの実施例である。
図中SVは監視制御局、ND1〜ND4はノード局、
１は光受光部、２は増巾器、３は等化器、４は波
形整形部、５は自動利得調整回路、６は尖頭値検
出回路、７は光受信レベル監視部、８は光受信レ
ベル温度補正部、９は光発光素子劣化の場合の機
能喪失前のレベルを検出するため、あらかじめ定
めた閾値を持つ警報発生回路、１０は光信号入力
端子、１１は出力端子、１２は警報信号出力端
子、１３はノード局のアドレス挿入部、１４はレ
ベルアラームフラグ挿入部である。
Fig. 1 is a principle diagram of a loop network consisting of a plurality of NDs and transmission lines for SV, Fig. 2 is a block diagram of a receiving opto-electrical conversion circuit in an ND according to an embodiment of the present invention, and Fig. 3 is a diagram of a receiving opto-electric conversion circuit in an ND according to an embodiment of the present invention. This is an example of a monitoring frame format. In the figure, SV is a supervisory control station, ND 1 to ND 4 are node stations,
1 is a light receiving section, 2 is an amplifier, 3 is an equalizer, 4 is a waveform shaping section, 5 is an automatic gain adjustment circuit, 6 is a peak value detection circuit, 7 is an optical reception level monitoring section, 8 is an optical 9 is a reception level temperature correction unit; 9 is an alarm generating circuit having a predetermined threshold value in order to detect the level before loss of function in the case of deterioration of the light emitting element; 10 is an optical signal input terminal; 11 is an output terminal; 12 is an alarm A signal output terminal, 13 is a node station address insertion section, and 14 is a level alarm flag insertion section.
Claims (1)
複数のノード局より構成される光通信ループネツ
トワークにおいて、各ノード局及び監視制御局
に、光受信レベルを監視する受光素子の環境変化
により変化する特性を補正する手段を持つ光受信
レベル監視警報器を持ち、 前局の光出力レベルを、ノード局及び監視制御
局にて発光素子が劣化しているが機能は喪失して
ないレベルを検出する閾値にて監視し、該前局の
光発光素子の劣化を検知し、警報信号を監視制御
局に通知することを特徴とする光通信ループネツ
トワークの監視方式。[Claims] 1. In an optical communication loop network consisting of a supervisory control station having an optical transmission path and a light emitting element, and a plurality of node stations, each node station and supervisory control station monitors the optical reception level. It has an optical reception level monitoring alarm device that has a means to correct the characteristics that change due to environmental changes of the light receiving element, and the light output level of the previous station can be checked at the node station and the monitoring control station even if the light emitting element has deteriorated, but the function is still not working. A monitoring system for an optical communication loop network, characterized in that monitoring is performed using a threshold value for detecting a level that has not been lost, detecting deterioration of a light emitting element of the previous station, and notifying a monitoring control station of an alarm signal.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP55151189A JPS5775040A (en) | 1980-10-28 | 1980-10-28 | Supervisory system for optical communication loop network |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP55151189A JPS5775040A (en) | 1980-10-28 | 1980-10-28 | Supervisory system for optical communication loop network |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS5775040A JPS5775040A (en) | 1982-05-11 |
| JPS6141182B2 true JPS6141182B2 (en) | 1986-09-12 |
Family
ID=15513216
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP55151189A Granted JPS5775040A (en) | 1980-10-28 | 1980-10-28 | Supervisory system for optical communication loop network |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS5775040A (en) |
Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB9106181D0 (en) * | 1991-03-22 | 1991-05-08 | British Telecomm | Photonic amplifier |
| US5220581A (en) * | 1991-03-28 | 1993-06-15 | International Business Machines Corporation | Digital data link performance monitor |
| JPH0730503A (en) * | 1993-07-14 | 1995-01-31 | Nec Corp | Optical direct amplifier repeater |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS51123002A (en) * | 1975-04-18 | 1976-10-27 | Nec Corp | Optical communications system |
-
1980
- 1980-10-28 JP JP55151189A patent/JPS5775040A/en active Granted
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS51123002A (en) * | 1975-04-18 | 1976-10-27 | Nec Corp | Optical communications system |
Also Published As
| Publication number | Publication date |
|---|---|
| JPS5775040A (en) | 1982-05-11 |
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