JP2615762B2 - Loop type optical transmission equipment - Google Patents

Loop type optical transmission equipment

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Publication number
JP2615762B2
JP2615762B2 JP63036181A JP3618188A JP2615762B2 JP 2615762 B2 JP2615762 B2 JP 2615762B2 JP 63036181 A JP63036181 A JP 63036181A JP 3618188 A JP3618188 A JP 3618188A JP 2615762 B2 JP2615762 B2 JP 2615762B2
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JP
Japan
Prior art keywords
circuit
working
transmission
protection
monitoring
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 - Lifetime
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JP63036181A
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Japanese (ja)
Other versions
JPH01212045A (en
Inventor
徹 大鹿
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
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Publication of JPH01212045A publication Critical patent/JPH01212045A/en
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Publication of JP2615762B2 publication Critical patent/JP2615762B2/en
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Description

【発明の詳細な説明】 〔産業上の利用分野〕 本発明は、光通信のループ型光伝送装置に利用する。
特に、現用側伝送路と予備側伝送路とを有するループ型
光伝送装置の監視制御方式に関するものである。現用側
の監視制御情報を予備側で伝送し、予備側の監視制御情
報を現用側で伝送してバイパス切替、現用または予備の
切替およびループバック制御を行う監視制御方式に関す
るものである。DETAILED DESCRIPTION OF THE INVENTION [Industrial Application Field] The present invention is used for a loop-type optical transmission device for optical communication.
In particular, the present invention relates to a monitoring and control method for a loop-type optical transmission device having a working transmission line and a protection transmission line. The present invention relates to a monitoring control method in which the monitoring control information on the working side is transmitted on the protection side, and the monitoring control information on the protection side is transmitted on the working side to perform bypass switching, switching between working or protection, and loopback control.

〔概要〕〔Overview〕

本発明はループ型光伝送装置において、 一方の側の監視制御回路はその側の伝送路および送受
信用の各回路の状態を他方の側の伝送路を経由して監視
制御装置に送出し、一方の側の障害発生時に監視制御装
置は他方の側の伝送路を経由して一斉切替指令情報を送
出して他方の側に切替えさせることにより、 現用または予備の切替を行うことができ、障害部位を
短時間に確定して復旧しループ型光伝送路として構成で
きるようにしたものである。The present invention relates to a loop-type optical transmission device, wherein the supervisory control circuit on one side sends the state of the transmission line on that side and each circuit for transmission / reception to the supervisory control device via the transmission line on the other side. In the event of a failure on one side, the supervisory control device sends the simultaneous switching command information via the transmission path on the other side and switches to the other side, so that the working or standby switching can be performed, Is determined in a short time and restored, so that a loop-type optical transmission path can be configured.

〔従来の技術〕[Conventional technology]

第３図は従来例のループ型光伝送装置の伝送制御装置
のブロック構成図である。第４図は従来例のループ型光
伝送装置のブロック構成図である。FIG. 3 is a block diagram of a transmission control device of a conventional loop type optical transmission device. FIG. 4 is a block diagram of a conventional loop type optical transmission device.

第４図において、親局Ｍにはすべての局の状態を監視
し、かつ制御を行う監視制御装置200が接続されてい
る。また、現用側伝送路l1と予備側伝送路l2の信号の流
れは相反する方向となっている。In FIG. 4, a monitoring and control device 200 for monitoring and controlling the status of all the stations is connected to the master station M. Further, the signal flow the working side transmission line l 1 and pre-side transmission line l 2 is in the opposite direction.

ここで第３図を使用して監視制御方式について述べ
る。いま、かりに現用側伝送路l1のうち子局S1と子局S2
との間が断（子局S1の現用側光送送信回路16と子局S2の
現用側光受信回路11も含む）となった場合に、子局S2の
局では光信号の断を検出し、その情報を現用側監視制御
回路19および予備側監視制御回路29を介して現用予備ル
ープバック切替回路31へ連絡し、予備側光受信回路21、
予備側復号化回路22および予備側分離回路23を現用予備
ループバック切替回路31を介して現用側多重化回路14、
現用側符号化回路15および現用側光送信回路16側へ接続
する。またそれにともない子局S1では、現用側監視制御
回路19および予備側監視制御回路29を介して現用予備ル
ープバック切替回路31へ連絡し、現用側光受信回路11、
現用側復号化回路12および現用側分離回路13を現用予備
ループバック切替回路31を介して予備側多重化回路24、
予備側符号化回路25および予備側送信回路26側へ接続し
ループバック状態を確立して伝送路を復旧する。また、
現用側光受信回路11および現用側光送信回路16のみ正常
動作させるためには現用側ラインバイパス切替回路17を
介してラインバイパス状態を確立し、現用側光受信回路
11、現用側光送信回路16、現用側復号化回路12および現
用側符号化回路15を正常動作させるためには現用側符号
化復号化部バイパス切替回路18を介して符号化復号化部
バイパス状態を確立することも可能である。Here, the monitoring control method will be described with reference to FIG. Now, the slave stations S 1 and S 2 of the working side transmission line l 1
Cross between the when it becomes the cross-sectional (use side light receiving circuit 11 of the active-side optical transmission transmitting circuit 16 of the slave station S 1 slave stations S 2 included), the optical signal in the station of the slave station S 2 and , And the information is communicated to the working standby loopback switching circuit 31 through the working side monitoring control circuit 19 and the protection side monitoring control circuit 29, and the protection side light receiving circuit 21,
The protection side decoding circuit 22 and the protection side separation circuit 23 are connected to the working side multiplexing circuit 14 through the working protection loopback switching circuit 31,
It is connected to the working side encoding circuit 15 and the working side optical transmission circuit 16 side. At the same time, the slave station S1 communicates with the working protection loopback switching circuit 31 via the working monitoring control circuit 19 and the protection monitoring control circuit 29, and the working light receiving circuit 11,
The working-side decoding circuit 12 and the working-side separation circuit 13 are connected to the protection-side multiplexing circuit 24 via the working protection loop-back switching circuit 31,
It connects to the protection side encoding circuit 25 and the protection side transmission circuit 26 side to establish a loopback state and restore the transmission path. Also,
In order for only the working side optical receiving circuit 11 and the working side optical transmitting circuit 16 to operate normally, a line bypass state is established via the working side line bypass switching circuit 17, and the working side optical receiving circuit
11, the working-side optical transmission circuit 16, the working-side decoding circuit 12, and the working-side coding circuit 15 are operated in order to operate normally. It is also possible to establish

ここで回線障害が発生した場合に、以下の項目を実施
することが重要と考えられる。Here, when a line failure occurs, it is considered important to carry out the following items.

回線の救済を計る。 Measure line relief.

障害部位を短時間内に確定する。 Determine the site of the failure in a short time.

障害部位の切り離しを行う。 Disconnect the faulty part.

障害部位を修復または交換する。 Repair or replace the affected area.

修復または交換した部位の個別テストを行う。 Perform an individual test of the repaired or replaced part.

ループ型光伝送路としての総合テストを行う。 Perform a comprehensive test as a loop-type optical transmission line.

〔発明が解決しようとする問題点〕[Problems to be solved by the invention]

しかし、従来のループ型光伝送装置では、伝送路障害
が発生するとループバック状態となるために、上記項目
、、を実施することが困難である欠点があった。However, the conventional loop-type optical transmission device has a drawback that it is difficult to perform the above-mentioned items, because a loop-back state occurs when a transmission path failure occurs.

本発明は上記の欠点を解決するもので、障害部位は短
時間内に確定して復旧しループ型光伝送路として構成で
きるループ型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 provide a loop-type optical transmission device that can solve the above-mentioned drawbacks and determine and restore a faulty site within a short time and configure a loop-type optical transmission line.

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

本発明は、親局と、この親局に現用側および予備側の
二系統のループ状の伝送路を介して接続された複数個の
子局とを備え、上記親局および上記複数個の子局はそれ
ぞれ、上記伝送路に接続された伝送制御装置を含み、上
記親局は、この伝送制御装置に接続されすべての局の状
態を監視し制御を行う監視制御装置を含み、上記伝送制
御装置は、現用側および予備側の二系統の伝送手段と、
この伝送手段および上記伝送路を監視および制御する監
視制御回路と、この監視制御回路の制御に従って現用ま
たは予備もしくはループバック切替を行う切替回路とを
含むループバック型光伝送装置において、一方の側の監
視制御回路は、それぞれその側の伝送手段および伝送路
の状態情報を他方の側の伝送手段および伝送路を経由し
て上記監視制御装置に出力する手段を含み、上記監視制
御装置は、この出力する手段の出力に基づいて上記他方
の側の伝送手段および伝送路を経由して上記各監視制御
回路にそれぞれ一斉切替指令情報を送出する手段を含む
ことを特徴とする。The present invention includes a master station, and a plurality of slave stations connected to the master station via two loop transmission lines of a working side and a protection side, wherein the master station and the plurality of slave stations are provided. The stations each include a transmission control device connected to the transmission path, and the master station includes a monitoring control device connected to the transmission control device for monitoring and controlling the status of all the stations. Is a two-way transmission means of working and protection,
In a loop-back type optical transmission apparatus including a monitoring control circuit for monitoring and controlling the transmission means and the transmission path, and a switching circuit for performing a working, protection, or loop-back switching according to the control of the monitoring control circuit, The monitoring control circuit includes means for outputting the status information of the transmission means and the transmission path on the side to the monitoring control apparatus via the transmission means and the transmission path on the other side, respectively. Means for transmitting simultaneous switching command information to each of the monitoring control circuits via the transmission means on the other side and the transmission path based on the output of the means for performing the switching.

〔作用〕[Action]

一方の側の監視制御回路は出力する手段でその一方の
側の伝送手段および伝送路の状態を他方の側の伝送手段
および伝送路を経由して親局の監視制御装置に出力す
る。一方の側の伝送手段および伝送路の障害発生時にこ
の出力する手段の出力に基づいて親局の監視制御装置の
送出する手段で他方の側の伝送手段および伝送路を経由
して各監視制御回路に一斉切替指令情報を送出し他方の
側に切替えさせる。以上の動作により現用と予備との切
替を行うことができ、障害部位を短時間に確定して復旧
しループ型光伝送路として構成できる。The monitoring control circuit on one side outputs the status of the transmission means and the transmission path on one side to the monitoring control apparatus of the master station via the transmission means and the transmission path on the other side. A means for sending by the supervisory control device of the master station based on the output of the transmitting means on one side and the means for outputting when a fault occurs in the transmission line, and each monitoring control circuit via the transmitting means and the transmission line on the other side. At the same time and sends the information to the other side. By the above operation, switching between the active and the standby can be performed, and the fault site can be determined and recovered in a short time, and can be configured as a loop type optical transmission line.

〔実施例〕〔Example〕

本発明の実施例について図面を参照して説明する。第
２図は本発明一実施例ループ型光伝送装置のブロック構
成図である。第１図は本発明のループ型光伝送装置の伝
送制御装置のブロック構成図である。第２図において、
ループ型光伝送装置は、親局Ｍと、親局Ｍに現用側伝送
路l1および予備側伝送路l2の二系統のループ状の伝送路
を介して接続された複数個の子局S1〜S3とを備え、親局
Ｍおよび複数個の子局S1〜S3はそれぞれ、現用側伝送路
l1および予備側伝送路l2に接続された伝送制御装置100
を含み、親局Ｍは、この伝送制御装置100に接続されす
べての局の状態を監視し制御を行う監視制御装置200を
含む。Embodiments of the present invention will be described with reference to the drawings. FIG. 2 is a block diagram of a loop type optical transmission device according to an embodiment of the present invention. FIG. 1 is a block diagram of the transmission control device of the loop type optical transmission device of the present invention. In FIG.
Loop optical transmission device, a master station M and a master station M on the working side transmission line l 1 and pre-side transmission line l 2 of two systems plurality of slave stations S connected through a loop transmission path of and a 1 to S 3, respectively the master station M and a plurality of slave stations S 1 to S 3 are use side transmission line
Transmission control device 100 connected to l 1 and protection side transmission line l 2
The master station M includes a monitoring control device 200 connected to the transmission control device 100 and monitoring and controlling the status of all the stations.

伝送制御装置100は、現用側の伝送手段である現用側
伝送路l1に接続された現用側光受信回路11と、現用側光
受信回路11の出力を復号化する現用側復号化回路12と、
現用側復号化回路12の出力を分離する現用側分離回路13
と、分離された光信号を多重化する現用側多重化回路14
と、現用側多重化回路14の出力を符号化する現用側符号
化回路15と、符号化された光信号を現用側伝送路l1に送
出する現用側光送信回路16とを含む。Transmission control device 100 includes a use side light receiving circuit 11 connected to the working side transmission line l 1 is the transmitting means of the active side, the working side decoding circuit 12 for decoding the output of the active-side optical receiving circuit 11 ,
Working-side separation circuit 13 for separating the output of working-side decoding circuit 12
And a working-side multiplexing circuit 14 for multiplexing the separated optical signals.
If includes the use side encoding circuit 15 for encoding the output of the active-side multiplexing circuit 14, and a use side optical transmitting circuit 16 for transmitting an optical signal encoded in the working side transmission line l 1.

また、伝送制御装置100は、予備側の伝送手段として
現用側の伝送手段と同様に予備側伝送路l2に接続された
予備側光受信回路21と、予備側復号化回路22と、予備側
分離回路23と、予備側多重化回路24と、予備側符号化回
路25と、予備側光送信回路26とを含む。The transmission control device 100 includes a pre-side optical receiving circuit 21 connected to the backup transmission line l 2 as with transmitting means of the working side as the transmission means for the backup, the backup-decoding circuit 22, pre-side It includes a demultiplexing circuit 23, a protection side multiplexing circuit 24, a protection side coding circuit 25, and a protection side optical transmission circuit 26.

また、伝送制御装置100は、現用側分離回路13の出力
を入力し現用側伝送路l1および現用側各回路の監視およ
び制御を行う現用側監視制御回路19と、予備側監視制御
回路29と、現用側監視制御回路19および予備側監視制御
回路29の制御に従って現用側分離回路13の出力を現用側
多重化回路14に与え、予備側分離回路23の出力を予備側
多重化回路24に与え、または現用側分離回路13の出力を
予備側多重化回路24に与え、予備側分離回路23の出力を
現用側多重化回路14に与えて現用または予備もしくはル
ープバック切替を行う現用予備ループバック切替回路31
とを含む。The transmission control device 100, the working side monitoring control circuit 19 for monitoring and control of the input current side transmission line l 1 and use side each circuit the output of the active-side separation circuit 13, a pre-side monitoring control circuit 29 The output of the working-side separation circuit 13 is provided to the working-side multiplexing circuit 14 and the output of the protection-side separation circuit 23 is provided to the protection-side multiplexing circuit 24 in accordance with the control of the working-side monitoring and control circuit 19 and the protection-side monitoring and control circuit 29. Or, the output of the working-side separation circuit 13 is supplied to the protection-side multiplexing circuit 24, and the output of the protection-side separation circuit 23 is supplied to the working-side multiplexing circuit 14 to perform the working, protection, or loopback switching. Circuit 31
And

さらに、伝送制御装置100は、現用予備ループバック
切替回路31に接続された４多重構成の端末インタフェー
ス411〜414と、現用側監視制御回路19（または予備側監
視制御回路29）の制御に従って現用側復号化回路12（ま
たは予備側復号化回路22）の出力と現用側符号化回路15
（または予備側符号化回路25）の入力とを接続する現用
側符号化復号化部バイパス切替回路18と、現用側監視制
御回路19（または予備側監視制御回路29）の制御に従っ
て現用側光受信回路11（または予備側光受信回路21）の
出力と現用側光送信回路16（または予備側光送信回路2
6）の入力とを接続する現用側ラインバイパス切替回路1
7（予備側ラインバイパス切替回路27）とを含む。Furthermore, the transmission control device 100 includes a working spare loopback switching circuit 31 is connected to the fourth terminal interface 41 1-41 4 multiplex configuration, under the control of the use side monitoring control circuit 19 (or pre-side monitor control circuit 29) Output of working side decoding circuit 12 (or protection side decoding circuit 22) and working side coding circuit 15
(Or the protection side coding control circuit 25) and the working side coding / decoding section bypass switching circuit 18 for connection to the input of the protection side coding control circuit 19 (or the protection side monitoring control circuit 29). The output of the circuit 11 (or the protection side optical transmission circuit 21) and the working side optical transmission circuit 16 (or the protection side optical transmission circuit 2).
6) Working line bypass switching circuit 1 that connects to the input of 6)
7 (a spare line bypass switching circuit 27).

ここで本発明の特徴とするところは、現用側監視制御
回路19（または予備側監視制御回路29）に、現用側の各
伝送回路および現用側伝送路l1（または予備側の各伝送
回路および予備側伝送路l2）の状態情報を予備側の各伝
送回路および予備側伝送路l2（または現用側の各伝送回
路および現用側伝送路l1）を経由して監視制御装置200
に出力する手段を含み、監視制御装置200に、この出力
する手段の出力に基づいて予備側の各伝送回路および予
備側伝送路l2（または現用側の各伝送回路および現用側
伝送路l1）を経由して現用側監視制御回路19および予備
側監視制御回路29に一斉切替指令情報を送出する手段を
含むことにある。Here, the feature of the present invention is that the working-side supervisory control circuit 19 (or the protection-side supervisory control circuit 29) includes the working-side transmission circuits and the working-side transmission line l 1 (or the protection-side transmission circuits and monitoring controller via the status each transmission circuit of the information pre-side and standby side transmission line l 2 (or each transmission circuit of the working side and the working side transmission line l 1) for the backup transmission line l 2) 200
Output to the supervisory control device 200, based on the output of the output means, to the protection-side transmission circuits and the protection-side transmission paths l 2 (or the working-side transmission circuits and the working-side transmission paths l 1 ), Means for transmitting simultaneous switching command information to the working side supervisory control circuit 19 and the standby side supervisory control circuit 29 via

このような構成のループ型光伝送装置の動作について
説明する。The operation of the loop type optical transmission device having such a configuration will be described.

第１図において、いまかりに、現用側伝送路l1のうち
子局S1と子局S2との間が断（子局S1の現用側光送信回路
16と子局S2の現用側光受信回路（11も含む）となった場
合に、子局S2の現用側監視制御回路19は信号の断を検出
し、その情報を予備側多重化回路24、予備側符号化回路
25および予備側光送信回路26および予備側伝送路l2を経
由して親局Ｍに接続されている監視制御装置200に送
る。In Figure 1, Suppose, slave station S 1 and the cross-sectional (slave station use side optical transmitting circuit S 1 between the slave station S 2 of the working side transmission line l 1
When a use side light receiving circuit 16 and the slave station S 2 (11 including), use side monitoring control circuit 19 of the slave station S 2 detects the interruption of the signal, the pre-side multiplexing circuit that information 24, spare side coding circuit
Via 25 and pre-side optical transmitting circuit 26 and the spare side transmission line l 2 sends to the monitoring and control device 200 connected to the master station M by.

その結果、現用側伝送路l1から予備側伝送路l2への切
替情報を予備側伝送路l2を使用して親局Ｍから子局S3→
子局S2→子局S1の順に送出し、所定時間後に各局の現用
予備ループバック切替回路31を使用し現用と予備との切
替を行う。As a result, the working side transmission line master station switching information using pre-side transmission line l 2 from l 1 to the standby side transmission line l 2 M slave station S 3 →
The slave station S 2 is transmitted in the order of the slave station S 1 , and after a predetermined time, the active / backup switching circuit 31 of each station is used to switch between working and standby.

また、同時に同一区間の現用および予備の伝送路障害
がともに発生した場合には該当する局にて現用予備ルー
プバック切替回路31を使用しループバック切替を行う。Further, when both the working and protection transmission line failures in the same section occur simultaneously, the corresponding station uses the working protection loopback switching circuit 31 to perform the loopback switching.

ラインバイパス切替および符号化復号化部バイパス切
替については従来技術と同様の方法で行う。Line bypass switching and encoding / decoding unit bypass switching are performed in the same manner as in the related art.

〔発明の効果〕〔The invention's effect〕

以上説明したように、本発明は、現用または予備の切
替を行うことができ、障害部位を短時間内に確定し、そ
の修復または交換を行い、ループ型光伝送路として構成
できる優れた効果がある。As described above, the present invention is capable of switching between working and standby, determining a faulty part in a short time, repairing or replacing the faulty part, and has an excellent effect of being configured as a loop type optical transmission line. is there.

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

第１図は本発明のループ型光伝送装置の伝送制御装置の
ブロック構成図。 第２図は本発明一実施例ループ型光伝送装置のブロック
構成図。 第３図は従来例のループ型光伝送装置の伝送制御装置の
ブロック構成図。 第４図は従来例のループ型光伝送装置のブロック構成
図。 11……現用側光受信回路、12……現用側復号化回路、13
……現用側分離回路、14……現用側多重化回路、15……
現用側符号化回路、16……現用側光送信回路、17……現
用側ラインバイパス切替回路、18……現用側符号化復号
化部バイパス切替回路、19……現用側監視制御回路、21
……予備側光受信回路、22……予備側復号化回路、23…
…予備側分離回路、24……予備側多重化回路、25……予
備側符号化回路、26……予備側光送信回路、27……予備
側ラインバイパス切替回路、28……予備側符号化復号化
部バイパス切替回路、29……予備側監視制御回路、31…
…現用予備ループバック切替回路、411〜414……端末イ
ンタフェース、100……伝送制御装置、200……監視制御
装置、l1……現用側伝送路、l2……予備側伝送路。FIG. 1 is a block diagram of a transmission control device of a loop type optical transmission device according to the present invention. FIG. 2 is a block diagram of a loop type optical transmission device according to an embodiment of the present invention. FIG. 3 is a block diagram of a transmission control device of a conventional loop type optical transmission device. FIG. 4 is a block diagram of a conventional loop type optical transmission device. 11: working side optical receiving circuit, 12: working side decoding circuit, 13
…… Working side separation circuit, 14 …… Working side multiplexing circuit, 15 ……
Working side encoding circuit, 16 ... Working side optical transmission circuit, 17 ... Working side line bypass switching circuit, 18 ... Working side encoding / decoding section bypass switching circuit, 19 ... Working side supervisory control circuit, 21
... Reserved optical receiving circuit, 22... Reserved decoding circuit, 23.
... A spare side demultiplexing circuit, 24. Decoupling unit bypass switching circuit, 29 ... Reserve side supervisory control circuit, 31 ...
... Working protection loopback switching circuit, 41 1 to 41 4 ... Terminal interface, 100... Transmission control device, 200... Monitoring control device, l 1 ... Working side transmission line, l 2 .

Claims (1)

(57)【特許請求の範囲】(57) [Claims] 【請求項１】親局と、この親局に現用側および予備側の
二系統のループ状の伝送路を介して接続された複数個の
子局とを備え、 上記親局および上記複数個の子局はそれぞれ、上記伝送
路に接続された伝送制御装置を含み、 上記親局は、この伝送制御装置に接続されすべての局の
状態を監視し制御を行う監視制御装置を含み、 上記伝送制御装置は、現用側および予備側の二系統の伝
送手段と、この伝送手段および上記伝送路を監視および
制御する監視制御回路と、この監視制御回路の制御に従
って現用または予備もしくはループバック切替を行う切
替回路とを含む ループバック型光伝送装置において、 一方の側の監視制御回路は、それぞれその側の伝送手段
および伝送路の状態情報を他方の側の伝送手段および伝
送路を経由して上記監視制御装置に出力する手段を含
み、 上記監視制御装置は、この出力する手段の出力に基づい
て上記他方の側の伝送手段および伝送路を経由して上記
各監視制御回路にそれぞれ一斉切替指令情報を送出する
手段を含む ことを特徴とするループ型光伝送装置。1. A master station comprising: a master station; and a plurality of slave stations connected to the master station via two working loop paths of a working side and a protection side. Each of the slave stations includes a transmission control device connected to the transmission path, and the master station includes a monitoring control device that is connected to the transmission control device and monitors and controls the status of all the stations. The apparatus includes two transmission means on the working side and the protection side, a monitoring control circuit for monitoring and controlling the transmission means and the transmission path, and a switch for performing a working, protection or loopback switching according to the control of the monitoring control circuit. Circuit, the supervisory control circuit on one side transmits the status information of the transmission means and the transmission path on that side via the transmission means and the transmission path on the other side. The monitoring control device sends simultaneous switching command information to each of the monitoring control circuits via the transmission means and the transmission path on the other side based on the output of the outputting means. A loop-type optical transmission device comprising:
JP63036181A 1988-02-18 1988-02-18 Loop type optical transmission equipment Expired - Lifetime JP2615762B2 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP63036181A JP2615762B2 (en) 1988-02-18 1988-02-18 Loop type optical transmission equipment

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP63036181A JP2615762B2 (en) 1988-02-18 1988-02-18 Loop type optical transmission equipment

Publications (2)

Publication Number Publication Date
JPH01212045A JPH01212045A (en) 1989-08-25
JP2615762B2 true JP2615762B2 (en) 1997-06-04

Family

ID=12462559

Family Applications (1)

Application Number Title Priority Date Filing Date
JP63036181A Expired - Lifetime JP2615762B2 (en) 1988-02-18 1988-02-18 Loop type optical transmission equipment

Country Status (1)

Country Link
JP (1) JP2615762B2 (en)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH03112235A (en) * 1989-09-26 1991-05-13 Nec Corp Looping back system for optical loop type transmission line

Also Published As

Publication number Publication date
JPH01212045A (en) 1989-08-25

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