JPH0389640A - Optical transmitter - Google Patents
Optical transmitterInfo
- Publication number
- JPH0389640A JPH0389640A JP1225994A JP22599489A JPH0389640A JP H0389640 A JPH0389640 A JP H0389640A JP 1225994 A JP1225994 A JP 1225994A JP 22599489 A JP22599489 A JP 22599489A JP H0389640 A JPH0389640 A JP H0389640A
- Authority
- JP
- Japan
- Prior art keywords
- signal
- synchronization
- station
- pattern
- circuit
- 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
Links
- 230000003287 optical effect Effects 0.000 title claims abstract description 23
- 230000005540 biological transmission Effects 0.000 claims abstract description 39
- 238000001514 detection method Methods 0.000 claims description 13
- 230000002457 bidirectional effect Effects 0.000 abstract description 4
- 230000001360 synchronised effect Effects 0.000 abstract 7
- 238000006243 chemical reaction Methods 0.000 description 9
- 238000010586 diagram Methods 0.000 description 4
- 230000000694 effects Effects 0.000 description 3
- 239000000945 filler Substances 0.000 description 1
- 230000007257 malfunction Effects 0.000 description 1
Landscapes
- Optical Communication System (AREA)
Abstract
Description
【発明の詳細な説明】
〔産業上の利用分野〕
本発明は、ディジタル通信装置に利用する。特に、双方
向光伝送手段に関する。DETAILED DESCRIPTION OF THE INVENTION [Industrial Application Field] The present invention is applied to a digital communication device. In particular, it relates to bidirectional optical transmission means.
本発明は、双方向光伝送系において、
送信信号と受信信号との同期信号のパターンを変えるこ
とにより、
伝送路障害検出を行うことができるようにしたものであ
る。The present invention makes it possible to detect a transmission path failure in a bidirectional optical transmission system by changing the synchronization signal pattern between a transmission signal and a reception signal.
一般には第３図に示す光伝送系が用いられている。自局
１０と相手局２０とは光伝送路３とで接続される。この
自局１０と相手局２０とは送信回路ｌ、電気光変換回路
４、方向性結合器５、光電気変換回路６、入力断検出回
路７および同期回路８とで構成される。自局１０では、
入力電気信号Ａは電気光変換部４で光信号列に変換され
、方向性結合器５を通して伝送路３に送出される。また
、相手局２０から送られてきた信号は方向性詰合器５を
通って光電気変換回路６で電気信号に変換され、同期回
路８で補助データ信号を分離後に受信信号Ｂとして他の
装置へ送出される。また、入力断検出回路７は光電気変
換回路６に光信号が入力されているか否かを入力断検出
回路７で再生したクロック信号の振−晶で判断する。Generally, the optical transmission system shown in FIG. 3 is used. The own station 10 and the other station 20 are connected by an optical transmission line 3. The local station 10 and the opposite station 20 are composed of a transmitting circuit 1, an electro-optical conversion circuit 4, a directional coupler 5, an optical-electrical conversion circuit 6, an input disconnection detection circuit 7, and a synchronization circuit 8. At my station 10,
The input electrical signal A is converted into an optical signal train by the electro-optic converter 4 and sent to the transmission line 3 through the directional coupler 5. Further, the signal sent from the partner station 20 passes through the directional filler 5, is converted into an electrical signal by the opto-electric conversion circuit 6, and is separated into an auxiliary data signal by the synchronization circuit 8, and then sent as the received signal B to other devices. sent to. Further, the input disconnection detection circuit 7 determines whether or not an optical signal is input to the opto-electric conversion circuit 6 based on the oscillator of the clock signal reproduced by the input disconnection detection circuit 7.
いま、この構成で系が動作している、ときに、第２図に
示すように伝送路３で障害が発生すると、自局１０から
送られてきた光信号はこの障害点で反射されて自局１０
に光信号が戻る。自局１０ではこの反射されて戻ってき
た信号が光電気変換部６で電気信号に変換され、同期回
路８を通って出力される。また光電気変換回路６に光信
号入力があるので、入力断検出回路７が動作せず、見掛
上相手局２０から送られてきた信号と誤認し、伝送路３
の障害を検出できない欠点がある。Now, when the system is operating with this configuration, if a failure occurs in the transmission line 3 as shown in Figure 2, the optical signal sent from the own station 10 will be reflected at this point of failure and will be self-transmitted. station 10
The optical signal returns to . In the own station 10, this reflected signal is converted into an electrical signal by the opto-electric conversion section 6, and is outputted through the synchronization circuit 8. In addition, since there is an optical signal input to the opto-electrical conversion circuit 6, the input disconnection detection circuit 7 does not operate and misidentifies the signal as being sent from the other station 20, causing the transmission line 3
It has the disadvantage of not being able to detect failures.
本発明はこのような欠点を除去し、伝送路障害時にも誤
動作しない光伝送装置を提供することを目的とする。SUMMARY OF THE INVENTION An object of the present invention is to eliminate such drawbacks and provide an optical transmission device that does not malfunction even in the event of a transmission path failure.
〔問題点を解決するための手段〕
本発明は、光伝送路を経由してデータ授受を双方向に行
う対向する局のそれぞれに含まれ、このデータのフレー
ム同期の基準となる同期パターンを検出する同期回路を
備えた光伝送装置において、相手局から送信される信号
にかかわる同期信号のパターンとは異なるパターンの同
期信号を用いて相手局に信号を送信する送信回路と、上
記光伝送路を経由して到来した信号にかかわる同期信号
のパターンを検出し、自局から送信した信号の同期パタ
ーンと一致もしくは反転が検出されたときに上記光伝送
路に断線が発生したと判断する断線検出回路とを備えた
ことを特徴とする。[Means for solving the problem] The present invention detects a synchronization pattern that is included in each of opposing stations that exchange data in both directions via an optical transmission line, and that serves as a reference for frame synchronization of this data. An optical transmission device equipped with a synchronization circuit that transmits a signal to the other station using a synchronization signal pattern that is different from a synchronization signal pattern related to the signal transmitted from the other station, and A disconnection detection circuit that detects the synchronization signal pattern related to the signal that has arrived via the network, and determines that a disconnection has occurred in the optical transmission line when a match or inversion with the synchronization pattern of the signal transmitted from the local station is detected. It is characterized by having the following.
送信信号の同期信号のパターンと受信信号の同期信号の
パターンとが異なる。断線点で反射される信号は送信信
号と等価のパターンであり、受信信号と区別することが
できる。この位相検出により断線事故を確認することが
できる。The synchronization signal pattern of the transmitted signal and the synchronization signal pattern of the received signal are different. The signal reflected at the disconnection point has a pattern equivalent to the transmitted signal and can be distinguished from the received signal. This phase detection makes it possible to confirm a disconnection accident.
以下、本発明の一実施例を図面に基づき説明する。第１
図は、この実施例の構成を示すブロック構成図である。Hereinafter, one embodiment of the present invention will be described based on the drawings. 1st
The figure is a block configuration diagram showing the configuration of this embodiment.
この実施例は、第１図に示すように、自局１０と、伝送
路３と、相手局２０とを備え、自局１０には、送信回路
１と、電気光変換回路４と、方向性結合器５と、光電気
変換回路６と、入力断検出回路７と、断線検出回路２と
を備える。すなわち、この実施例は、伝送路３を経由し
てデータ授受を双方向に行う対向する局１０おより２０
のそれぞれに含まれ、このデータのフレーム同期の基準
となる同期パターンを検出する同期回路８を備え、さら
に、本発明の特徴とする手段として、相手局から送信さ
れる信号にかかわる同期信号のパターンとは異なるパタ
ーンの同期信号を用いて相手局に信号を送信する送信回
路１と、伝送路３を経由して到来した信号にかかわる同
期信号のパターンを検出し、自局から送信した信号の同
期パターンと一致もしくは反転が検出されたときに伝送
路３に断線が発生したと判断する断線検出回路２とを備
える。As shown in FIG. 1, this embodiment includes a local station 10, a transmission line 3, and a partner station 20. It includes a coupler 5, a photoelectric conversion circuit 6, an input disconnection detection circuit 7, and a disconnection detection circuit 2. That is, in this embodiment, the opposing stations 10 and 20 exchange data in both directions via the transmission line 3.
It is provided with a synchronization circuit 8 for detecting a synchronization pattern included in each of the data and serving as a reference for frame synchronization of this data. A transmission circuit 1 transmits a signal to the other station using a synchronization signal with a pattern different from that of the other station, and a transmission circuit 1 detects the pattern of the synchronization signal related to the signal arriving via the transmission path 3, and synchronizes the signal transmitted from the own station. A disconnection detection circuit 2 is provided which determines that a disconnection has occurred in the transmission line 3 when a match or inversion of the pattern is detected.
次に、この実施例の動作を説明する。自局１０から送ら
れる送信信号の同期信号をＦとする。これに対し相手局
２０から送られる信号の同期信号を自局１０から送られ
る同期信号の反転信号を使用してＦとする。自局１０か
らは同期信号Ｆを含んだ信号が送信され相手局２０から
は同期信号Ｆを含んだ信号が送出されている。したがっ
て、自局１０の同期回路８では同期信号Ｆを検出して補
助データ信号などを分離し、他装置へ送る。いま伝送１
３で障害が発生したとすると、障害点で反射された信号
は同期信号Ｆを含んでいるので、自局１０の同期回路８
°でこの同期信号Ｆを検出することにより人力断検出回
路７が動作しなくとも障害を検出することができる。Next, the operation of this embodiment will be explained. Let F be the synchronization signal of the transmission signal sent from the own station 10. On the other hand, the synchronization signal of the signal sent from the partner station 20 is set to F by using the inverted signal of the synchronization signal sent from the own station 10. A signal containing the synchronization signal F is transmitted from the local station 10, and a signal containing the synchronization signal F is transmitted from the opposite station 20. Therefore, the synchronization circuit 8 of the own station 10 detects the synchronization signal F, separates the auxiliary data signal, etc., and sends it to other devices. Transmission now 1
3, the signal reflected at the point of failure includes the synchronization signal F, so the synchronization circuit 8 of the local station 10
By detecting this synchronization signal F at 10°, a failure can be detected even if the human power failure detection circuit 7 does not operate.
本発明は、以上説明したように、双方向光伝送時に送信
信号と受信信号の同期信号のパターンを変えて伝送路障
害時
を向上する効果がある。As explained above, the present invention has the effect of changing the synchronization signal pattern of the transmission signal and the reception signal during bidirectional optical transmission to improve the situation in the event of a transmission path failure.
第１図は本発明実施例の構成を示すブロック構成図。
第２図は伝送路障害時の状態を示す説明図。
第３図は従来例の構成を示すブロック構成図。
１・・・道信回路、２・・・断線検出回路、３・・・伝
送路、４・・・電気光変換回路、５・・・方向性結合器
、６・・・光電気変換回路、７・・・入力断検出回路、
８・・・同期回路、ｌＯ・・・自局、２０・・・相手局
。FIG. 1 is a block configuration diagram showing the configuration of an embodiment of the present invention. FIG. 2 is an explanatory diagram showing a state when a transmission path failure occurs. FIG. 3 is a block configuration diagram showing the configuration of a conventional example. DESCRIPTION OF SYMBOLS 1... Doshin circuit, 2... Disconnection detection circuit, 3... Transmission line, 4... Electrical optical conversion circuit, 5... Directional coupler, 6... Optical electrical conversion circuit, 7... Input disconnection detection circuit,
8...Synchronization circuit, lO...own station, 20...other station.
Claims (1)
する局のそれぞれに含まれ、このデータのフレーム同期
の基準となる同期パターンを検出する同期回路を備えた
光伝送装置において、 相手局から送信される信号にかかわる同期信号のパター
ンとは異なるパターンの同期信号を用いて相手局に信号
を送信する送信回路と、 上記光伝送路を経由して到来した信号にかかわる同期信
号のパターンを検出し、自局から送信した信号の同期パ
ターンと一致もしくは反転が検出されたときに上記光伝
送路に断線が発生したと判断する断線検出回路と を備えたことを特徴とする光伝送装置。[Scope of Claims] 1. A synchronization circuit included in each of opposing stations that bidirectionally exchanges data via an optical transmission line to detect a synchronization pattern that serves as a reference for frame synchronization of this data. An optical transmission device includes a transmission circuit that transmits a signal to a partner station using a synchronization signal pattern that is different from the pattern of the synchronization signal related to the signal transmitted from the partner station, and a signal that arrives via the optical transmission path. and a disconnection detection circuit that detects a synchronization signal pattern related to the transmission and determines that a disconnection has occurred in the optical transmission line when a match or inversion with the synchronization pattern of the signal transmitted from the local station is detected. Features of optical transmission equipment.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1225994A JP2504213B2 (en) | 1989-08-31 | 1989-08-31 | Optical transmission device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1225994A JP2504213B2 (en) | 1989-08-31 | 1989-08-31 | Optical transmission device |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH0389640A true JPH0389640A (en) | 1991-04-15 |
| JP2504213B2 JP2504213B2 (en) | 1996-06-05 |
Family
ID=16838128
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP1225994A Expired - Lifetime JP2504213B2 (en) | 1989-08-31 | 1989-08-31 | Optical transmission device |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP2504213B2 (en) |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS583341A (en) * | 1981-06-29 | 1983-01-10 | Fuji Facom Corp | Bidirectional communication system |
-
1989
- 1989-08-31 JP JP1225994A patent/JP2504213B2/en not_active Expired - Lifetime
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS583341A (en) * | 1981-06-29 | 1983-01-10 | Fuji Facom Corp | Bidirectional communication system |
Also Published As
| Publication number | Publication date |
|---|---|
| JP2504213B2 (en) | 1996-06-05 |
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