JPH0823304A - Switching/switch-back device - Google Patents
Switching/switch-back deviceInfo
- Publication number
- JPH0823304A JPH0823304A JP6154932A JP15493294A JPH0823304A JP H0823304 A JPH0823304 A JP H0823304A JP 6154932 A JP6154932 A JP 6154932A JP 15493294 A JP15493294 A JP 15493294A JP H0823304 A JPH0823304 A JP H0823304A
- Authority
- JP
- Japan
- Prior art keywords
- switching
- failures
- standby system
- switch
- failure
- 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
Landscapes
- Detection And Prevention Of Errors In Transmission (AREA)
- Optical Communication System (AREA)
Abstract
Description
【０００１】[0001]
【産業上の利用分野】本発明は、二重化された光伝送路
を介してセンタ装置と複数のユーザ装置との間で双方向
通信を行う二重化パッシブスター構成の光伝送システム
において、現用系から予備系への切替え、および予備系
から現用系への切戻しを行う切替え切戻し装置に関す
る。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a dual passive star optical transmission system for performing bidirectional communication between a center device and a plurality of user devices via a duplicated optical transmission line. The present invention relates to a switching failback device that switches to a system and switches back from a standby system to an active system.
【０００２】[0002]
【従来の技術】図４は、二重化パッシブスター光伝送シ
ステムの基本構成を示す。本光伝送システムは、二重化
された光伝送路１−１，１−２および光スターカプラ２
−１，２−２を介して、センタ装置３と複数のユーザ装
置４−１〜４−ｎとを対向接続した構成である。この構
成では、センタ装置３から各ユーザ装置４−１〜４−ｎ
に伝送される下り信号は時分割多重され、光スターカプ
ラ２−１，２−２で分岐されて各ユーザ装置４−１〜４
−ｎに送られる。各ユーザ装置４−１〜４−ｎは、時分
割多重された下り信号から自分宛の信号を切り出して受
信する。一方、各ユーザ装置４−１〜４−ｎが所定の送
信タイミングで信号を送出すると、光スターカプラ２−
１，２−２でパッシブ多重され、各ユーザ装置からの上
り信号が時間軸上に並んでセンタ装置３に受信される。2. Description of the Related Art FIG. 4 shows a basic structure of a duplex passive star optical transmission system. This optical transmission system includes a duplicated optical transmission lines 1-1 and 1-2 and an optical star coupler 2.
This is a configuration in which the center device 3 and a plurality of user devices 4-1 to 4-n are connected to each other via -1, 2-2. In this configuration, the center device 3 to each user device 4-1 to 4-n
The downlink signals transmitted to each of the user equipments 4-1 to 4 are time-division multiplexed and branched by the optical star couplers 2-1 and 2-2.
-N. Each of the user equipments 4-1 to 4-n cuts out and receives a signal addressed to itself from the time-division multiplexed downlink signal. On the other hand, when each of the user equipments 4-1 to 4-n sends a signal at a predetermined transmission timing, the optical star coupler 2-
The signals 1 and 2 are passively multiplexed, and the upstream signals from each user device are received by the center device 3 side by side on the time axis.
【０００３】センタ装置３から送信する下り信号は、０
系および１系の送受信部３０１−１，３０１−２に分配
され、各系の光伝送路および光スターカプラを介して各
ユーザ装置４−１〜４−ｎに伝送される。各ユーザ装置
の選択部４０２は、０系および１系の送受信部４０１−
１，４０１−２に受信された下り信号の現用系側を選択
する。また、各ユーザ装置４−１〜４−ｎから送信する
上り信号は、０系および１系の送受信部４０１−１，４
０１−２に分配され、各系の光伝送路および光スターカ
プラを介してセンタ装置３に伝送される。センタ装置の
選択部３０２は、０系および１系の送受信部３０１−
１，３０１−２に受信された上り信号の現用系側を選択
する。The downlink signal transmitted from the center device 3 is 0
It is distributed to the transmission / reception units 301-1 and 301-2 of the system and the system 1 and is transmitted to each of the user devices 4-1 to 4-n via the optical transmission line of each system and the optical star coupler. The selection unit 402 of each user apparatus is a 0-system and 1-system transmission / reception unit 401-
The working system side of the downlink signal received in No. 1, 401-2 is selected. In addition, the upstream signals transmitted from the user devices 4-1 to 4-n are transmitted / received by the 0-system and 1-system transmission / reception units 401-1 and 401-1
01-2, and is transmitted to the center device 3 via the optical transmission line of each system and the optical star coupler. The selection unit 302 of the center device is a transmission / reception unit 301-
The working system side of the uplink signal received in No. 1, 301-2 is selected.
【０００４】いま、０系が現用系となっているときに、
０系の光伝送路１−１，光スターカプラ２−１，送受信
部３０１−１，４０１−１のいずれかに故障が発生する
と、センタ装置３と各ユーザ装置４−１〜４−ｎとの間
で同時に、１系の光伝送路１−２，光スターカプラ２−
２，送受信部３０１−２，４０１−２に切り替わる。Now, when the 0 system is the active system,
When a failure occurs in any of the 0-system optical transmission line 1-1, the optical star coupler 2-1, and the transmission / reception units 301-1 and 401-1, the center device 3 and the user devices 4-1 to 4-n are connected to each other. At the same time between the two, optical transmission line 1-2 of one system, optical star coupler 2-
2. The transmission / reception units 301-2 and 401-2 are switched.
【０００５】図５は、１対１伝送システムにおける切替
え切戻し装置の構成を示す。以下、図６，図７に示すシ
ーケンスに従って各部の動作を説明する。センタ装置３
の故障検出部３２１は０系および１系の各受信信号をモ
ニタし、現用系の故障発生を検出すると、故障検出保護
時間Ｔa の経過後に故障と判断して故障情報を切替え制
御部３２２に通知する。切替え制御部３２２はこの故障
情報に応じて、まず対向するユーザ装置４に切替え要求
を送出する。この切替え要求は、挿入部３０３で下り信
号に重畳してユーザ装置４へ送られる。FIG. 5 shows the configuration of the switching back / back device in the one-to-one transmission system. The operation of each unit will be described below according to the sequences shown in FIGS. Center device 3
The failure detection unit 321 monitors the 0-system and 1-system received signals and, when detecting the occurrence of a failure in the active system, determines that the failure has occurred after the failure detection protection time Ta and notifies the switching control unit 322 of the failure information. To do. In response to this failure information, the switching control unit 322 first sends a switching request to the opposite user device 4. This switching request is superposed on the downlink signal by the inserting section 303 and sent to the user apparatus 4.
【０００６】ユーザ装置４の制御要求検出部４２１は、
センタ装置３から送られた切替え要求を検出して切替え
制御部４２２に通知する。切替え制御部４２２はこの切
替え要求に応じて、選択部４０２を現用系から予備系へ
切り替える切替え命令を送出し、さらにセンタ装置３に
切替え応答を送出する。この切替え応答は、挿入部４０
３で上り信号に重畳してセンタ装置３へ送られる。The control request detector 421 of the user device 4 is
The switching request sent from the center device 3 is detected and notified to the switching control unit 422. In response to this switching request, the switching control unit 422 sends a switching command for switching the selection unit 402 from the active system to the standby system, and further sends a switching response to the center device 3. This switching response is sent by the insertion unit 40.
At 3, the signal is superimposed on the upstream signal and sent to the center device 3.
【０００７】センタ装置３の応答検出部３２３は、ユー
ザ装置４から送られた切替え応答を検出して切替え制御
部３２２に通知する。切替え制御部３２２は、これに応
じて選択部３０２を現用系から予備系へ切り替える切替
え命令を送出する。これにより、センタ装置３およびユ
ーザ装置４は切替え状態となる。The response detection unit 323 of the center device 3 detects the switching response sent from the user device 4 and notifies the switching control unit 322 of it. In response to this, the switching control unit 322 sends a switching command for switching the selection unit 302 from the active system to the standby system. As a result, the center device 3 and the user device 4 are switched.
【０００８】この切替え状態中に、センタ装置３の故障
検出部３２１が現用系の故障回復を検出すると、回復確
認保護時間Ｔb の経過後に故障回復と判断して切替え制
御部３２２に通知する。切替え制御部３２２は、これに
応じてユーザ装置４に切替え完了通知を送出する。During the switching state, when the failure detecting section 321 of the center apparatus 3 detects the failure recovery of the active system, it judges that the failure is recovered after the recovery confirmation protection time Tb elapses and notifies the switching control section 322. In response to this, the switching control unit 322 sends a switching completion notification to the user device 4.
【０００９】ユーザ装置４の制御要求検出部４２１は、
センタ装置３から送られた切替え完了通知を検出して切
替え制御部４２２に通知する。切替え制御部４２２はこ
の切替え完了通知に応じて伝送路名の変更（現用系→予
備系，予備系→現用系）を行い、センタ装置３に切替え
完了通知を送出する。センタ装置３の応答検出部３２３
がこの切替え完了通知を検出すると、センタ装置３にお
いて伝送路名の変更を行う。これにより切替えシーケン
スが終了し、センタ装置３およびユーザ装置４は定常状
態となる。The control request detector 421 of the user device 4 is
The switching completion notification sent from the center device 3 is detected and notified to the switching control unit 422. The switching control unit 422 changes the transmission path name (active system → spare system, standby system → active system) according to the switching completion notification, and sends the switching completion notification to the center device 3. Response detection unit 323 of the center device 3
When the switch complete notice is detected, the center device 3 changes the transmission path name. As a result, the switching sequence ends, and the center device 3 and the user device 4 enter the steady state.
【００１０】一方、切替え状態中に、センタ装置３の故
障検出部３２４が予備系の故障発生を検出すると、図７
に示すように故障検出保護時間Ｔa の経過後に故障と判
断して故障情報を切戻し制御部３２５に通知する。切戻
し制御部３２５はこの故障情報に応じて、対向するユー
ザ装置４に切戻し要求を送出するとともに、選択部３０
２を予備系から現用系へ復帰させる切戻し命令を送出す
る。ユーザ装置４への切戻し要求は、挿入部３０３で下
り信号に重畳してユーザ装置４へ送られる。On the other hand, when the failure detecting unit 324 of the center device 3 detects the occurrence of a failure in the standby system during the switching state, the failure in FIG.
As shown in, the failure detection protection time Ta is determined to be a failure, and failure information is notified to the switchback control unit 325. The switchback control unit 325 sends a switchback request to the opposite user apparatus 4 in accordance with the failure information, and also the selection unit 30.
A failback command for returning 2 from the standby system to the active system is sent. The switchback request to the user apparatus 4 is superimposed on the downlink signal by the inserting unit 303 and sent to the user apparatus 4.
【００１１】ユーザ装置４の制御要求検出部４２１は、
センタ装置３から送られた切戻し要求を検出して切戻し
制御部４２３に通知する。切戻し制御部４２３はこの切
戻し要求に応じて、選択部４０２を予備系から現用系へ
復帰させる切戻し命令を送出し、さらにセンタ装置３に
切戻し完了通知を送出する。これにより切戻しシーケン
スを終了し、センタ装置３およびユーザ装置４は予備系
の故障定常状態となる。The control request detector 421 of the user device 4 is
The switchback request sent from the center device 3 is detected and notified to the switchback control unit 423. In response to this switchback request, the switchback control unit 423 sends out a switchback command for returning the selection unit 402 from the backup system to the active system, and further sends a switchback completion notification to the center device 3. As a result, the switchback sequence is completed, and the center apparatus 3 and the user apparatus 4 are in a failure steady state of the standby system.
【００１２】[0012]
【発明が解決しようとする課題】ところで、図５に示す
切替え切戻し装置の構成、図６，図７に示す切替え切戻
しシーケンスは、１対１の伝送システムに用いられてい
るものであり、そのまま図４に示すような１対多の二重
化パッシブスター光伝送システムに適用すると不都合が
生じる。By the way, the configuration of the switching cutback device shown in FIG. 5 and the switching cutback sequence shown in FIGS. 6 and 7 are used in a one-to-one transmission system. If it is directly applied to the one-to-many duplex passive star optical transmission system as shown in FIG.
【００１３】たとえば、図８に示すように、(a) センタ
装置３と現用系の光スターカプラ２−１との間で故障が
発生し、(b) 現用系から予備系に切替え、(c) 切替え状
態中に、予備系の光スターカプラ２−２とユーザ装置４
−３との間に故障が発生したとする。このとき、上述し
た切戻しシーケンスに従って現用系に切戻すと (a)の状
態となる。すなわち、(c) の状態では１つのユーザ装置
との間が不通であったが、(a) の状態に切戻すことによ
りすべてのユーザ装置との間が不通になる。For example, as shown in FIG. 8, (a) a failure occurs between the center device 3 and the optical star coupler 2-1 of the active system, (b) the active system is switched to the standby system, and (c) ) During the switching state, the standby optical star coupler 2-2 and the user equipment 4
It is assumed that a failure has occurred between -3 and -3. At this time, when switching back to the active system according to the switching back sequence described above, the state of (a) is obtained. That is, in the state of (c), the communication with one user device is cut off, but by switching back to the state of (a), all the user devices are cut off.
【００１４】また、図９に示すように、(a) 現用系の光
スターカプラ２−１とユーザ装置４−１，４−２，４−
３との間で故障が発生し、(b) 現用系から予備系に切替
え、(c) 切替え状態中に、予備系の光スターカプラ２−
２とユーザ装置４−３との間に故障が発生したとする。
このとき、上述した切戻しシーケンスに従って現用系に
切戻すと (a)の状態となる。すなわち、(c) の状態では
１つのユーザ装置との間が不通であったが、(a) の状態
に切戻すことにより３つのユーザ装置との間が不通にな
る。Further, as shown in FIG. 9, (a) the optical star coupler 2-1 of the working system and the user devices 4-1, 4-2, 4-.
3) a failure occurs, and (b) the active system is switched to the standby system, (c) the standby optical star coupler 2-
It is assumed that a failure has occurred between the device 2 and the user device 4-3.
At this time, when switching back to the active system according to the switching back sequence described above, the state of (a) is obtained. That is, in the state of (c), the communication with one user device is cut off, but by switching back to the state of (a), the connection with three user devices is cut off.
【００１５】このように、二重化パッシブスター光伝送
システムにおいては、現用系から予備系に切替えたもの
を単純に切戻すと、却ってサービスの悪化を招くことが
あった。As described above, in the duplex passive star optical transmission system, if the system switched from the active system to the standby system is simply switched back, the service may be deteriorated.
【００１６】本発明は、切戻しにあたってサービスの悪
化を防ぐことができる切替え切戻し装置を提供すること
を目的とする。It is an object of the present invention to provide a switching failback device capable of preventing deterioration of service in failback.
【００１７】[0017]
【課題を解決するための手段】本発明の切替え切戻し装
置は、切替え状態中に予備系の故障が検出されたとき
に、予備系の故障数に応じて切戻しを行うか否かを判断
する判断手段を備える。SUMMARY OF THE INVENTION The switching failback device of the present invention, when a failure of the standby system is detected during the switching state, determines whether to perform the switching back according to the number of failures of the standby system. It is equipped with a judgment means.
【００１８】判断手段は、予備系の故障数と現用系の故
障数とを比較し、予備系の故障数が現用系の故障数を上
回った場合に切戻しを行い、予備系の故障数が現用系の
故障数を下回った場合に切替え状態を維持する構成であ
る。The judgment means compares the number of failures in the standby system with the number of failures in the active system, and performs failback if the number of failures in the standby system exceeds the number of failures in the active system, and This is a configuration in which the switching state is maintained when the number of failures in the active system falls below.
【００１９】また、判断手段は、予備系の故障数と所定
数とを比較し、予備系の故障数が所定数を上回った場合
に切戻しを行い、予備系の故障数が所定数を下回った場
合に切替え状態を維持する構成である。Further, the judging means compares the number of failures in the backup system with a predetermined number, performs failback when the number of failures in the backup system exceeds a predetermined number, and the number of failures in the backup system falls below the predetermined number. In this case, the switching state is maintained in case of
【００２０】[0020]
【作用】本発明は、現用系の故障によって予備系への切
替えを行い、その切替え状態中に予備系の故障が検出さ
れたときに、予備系の故障数に応じて切戻しを行うか否
かを判断する。すなわち、予備系の故障数と現用系の故
障数とを比較し、あるいは予備系の故障数と所定数とを
比較し、切戻しを行うか切替え状態を維持するかを判断
する。これにより、現用系と予備系の各運用状態に応じ
た最善の系を選択することができる。According to the present invention, switching to the standby system is performed due to a failure in the active system, and when a failure in the standby system is detected during the switching state, whether to perform failback according to the number of failures in the standby system. To judge. That is, the number of failures in the standby system is compared with the number of failures in the active system, or the number of failures in the standby system is compared with a predetermined number to determine whether to perform failback or maintain the switching state. As a result, it is possible to select the best system according to each operating state of the active system and the standby system.
【００２１】[0021]
【実施例】図１は、本発明の切替え切戻し装置の実施例
構成を示す。本実施例は、図４に示す二重化パッシブス
ター光伝送システムに適用したものであるが、基本構成
は図５に示す１対１伝送システムにおける切替え切戻し
装置と同様である。ただし、故障検出部（現用系）３１
１、切替え制御部３１２、応答検出部３１３、故障検出
部（予備系）３１４、切戻し制御部３１７、制御要求検
出部４１１、切替え制御部４１２、切戻し制御部４１３
は、１対ｎに対応した構成となる。DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS FIG. 1 shows the configuration of an embodiment of a switching cutback device according to the present invention. Although this embodiment is applied to the duplex passive star optical transmission system shown in FIG. 4, the basic configuration is the same as the switching back-and-back device in the one-to-one transmission system shown in FIG. However, the failure detection unit (active system) 31
1, switching control unit 312, response detection unit 313, failure detection unit (standby system) 314, switchback control unit 317, control request detection unit 411, switching control unit 412, switchback control unit 413
Has a configuration corresponding to 1 to n.
【００２２】本発明の切替え切戻し装置の特徴とすると
ころは、現用系に故障が発生して予備系に切り替えた後
に予備系に故障が発生したときに、切戻しの可否を判断
するためのタイマ３１５と比較部３１６を備えたところ
にある。A feature of the switching fail-back device of the present invention is that it determines whether or not fail-back is possible when a failure occurs in the active system and a failure occurs in the standby system after switching to the standby system. It is provided with a timer 315 and a comparison unit 316.
【００２３】以下、図２，図３を参照して本発明装置に
よる切替え切戻しシーケンスについて説明する。センタ
装置３の故障検出部３１１は０系および１系の各受信信
号をモニタし、現用系の故障発生を検出すると、故障検
出保護時間Ｔa の経過後に故障と判断して故障情報を切
替え制御部３１２に通知する。切替え制御部３１２はこ
の故障情報に応じて、対向するユーザ装置４−１〜４−
ｎを検査する検査要求を各ユーザ装置に送出する。この
検査要求は、挿入部３０３で下り信号に重畳してユーザ
装置４へ送られる。The switching cutback sequence by the device of the present invention will be described below with reference to FIGS. The failure detection unit 311 of the center device 3 monitors each received signal of the 0-system and the 1-system, and when a failure occurrence in the active system is detected, the failure detection unit 311 determines that the failure occurs after the failure detection protection time Ta and switches the failure information. Notify 312. The switching control unit 312 responds to this failure information by opposing user devices 4-1 to 4-.
An inspection request for inspecting n is sent to each user device. This inspection request is superposed on the downlink signal by the inserting section 303 and sent to the user apparatus 4.
【００２４】ユーザ装置４の制御要求検出部４１１は、
センタ装置３から送られた検査要求を検出して切替え制
御部４１２に通知する。切替え制御部４１２はこの検査
要求に応じて所定の検査を行い、センタ装置３に検査応
答を送出する。この検査応答は、挿入部４０３で上り信
号に重畳してセンタ装置３へ送られる。The control request detector 411 of the user device 4 is
The inspection request sent from the center device 3 is detected and notified to the switching control unit 412. The switching control unit 412 performs a predetermined inspection in response to the inspection request and sends an inspection response to the center device 3. This inspection response is superimposed on the upstream signal by the inserting unit 403 and sent to the center device 3.
【００２５】センタ装置３の応答検出部３１３は、すべ
てのユーザ装置４−１〜４−ｎから送られた検査応答を
受信すると、切替え制御部３１２に通知する。切替え制
御部３１２は、これに応じて切替え要求を各ユーザ装置
４−１〜４−ｎ宛の下り信号に重畳して送る。When the response detection unit 313 of the center device 3 receives the inspection response sent from all the user devices 4-1 to 4-n, it notifies the switching control unit 312. In response to this, the switching control unit 312 superimposes the switching request on the downlink signals addressed to each of the user devices 4-1 to 4-n and sends them.
【００２６】各ユーザ装置４−１〜４−ｎの制御要求検
出部４１１は、センタ装置３から送られた切替え要求を
検出して切替え制御部４１２に通知する。切替え制御部
４１２はこの切替え要求に応じて、選択部４０２を現用
系から予備系へ切り替える切替え命令を送出し、さらに
切替え応答をセンタ装置３宛の上り信号に重畳して送
る。The control request detection unit 411 of each of the user devices 4-1 to 4-n detects the switching request sent from the center device 3 and notifies the switching control unit 412 of it. In response to this switching request, the switching control unit 412 sends a switching command for switching the selection unit 402 from the active system to the standby system, and further sends a switching response by superimposing it on the upstream signal addressed to the center device 3.
【００２７】センタ装置３の応答検出部３１３は、すべ
てのユーザ装置４−１〜４−ｎから送られた切替え応答
を検出して切替え制御部３１２に通知する。切替え制御
部３１２は、これに応じて選択部３０２を現用系から予
備系へ切り替える切替え命令を送出する。これにより、
センタ装置３および各ユーザ装置４−１〜４−ｎは切替
え状態となる。The response detection unit 313 of the center device 3 detects the switching response sent from all the user devices 4-1 to 4-n and notifies the switching control unit 312 of it. In response to this, the switching control unit 312 sends a switching command for switching the selection unit 302 from the active system to the standby system. This allows
The center device 3 and each of the user devices 4-1 to 4-n are switched.
【００２８】この切替え状態中に、センタ装置３の故障
検出部３１１が現用系の故障回復を検出すると、図６に
示したシーケンスと同様にセンタ装置３および各ユーザ
装置４−１〜４−ｎで伝送路名の変更を行い、切替えシ
ーケンスを終了して定常状態となる（図２，図３では省
略）。During this switching state, when the failure detecting unit 311 of the center apparatus 3 detects the failure recovery of the active system, the center apparatus 3 and each of the user apparatuses 4-1 to 4-n are processed similarly to the sequence shown in FIG. The transmission line name is changed in step S3, and the switching sequence is terminated to enter the steady state (not shown in FIGS. 2 and 3).
【００２９】一方、切替え状態中に、センタ装置３の故
障検出部３１４が予備系の故障発生を検出すると、タイ
マ３１５を起動する。タイマ３１５が故障検出保護時間
Ｔcをカウントした後に、比較部３１６が故障検出部３
１１で検出されている現用系の故障数と、故障検出部３
１４で検出されている予備系の故障数とを比較する。そ
の比較の結果、予備系の故障数が現用系の故障数を上回
った場合に、切戻し制御部３１７に故障情報を通知す
る。切戻し制御部３１５はこの故障情報に応じて、各ユ
ーザ装置４−１〜４−ｎに切戻し要求を送出するととも
に、選択部３０２を予備系から現用系へ復帰させる切戻
し命令を送出する。On the other hand, when the failure detecting unit 314 of the center device 3 detects the failure occurrence of the standby system during the switching state, the timer 315 is started. After the timer 315 counts the failure detection protection time Tc, the comparison unit 316 sets the failure detection unit 3
The number of active system failures detected in 11 and the failure detection unit 3
The number of failures of the standby system detected in 14 is compared. As a result of the comparison, when the number of failures in the standby system exceeds the number of failures in the active system, the failback control unit 317 is notified of the failure information. The failback control unit 315 sends a failback request to each of the user devices 4-1 to 4-n according to the failure information, and also sends a failback command for returning the selection unit 302 from the standby system to the active system. .
【００３０】各ユーザ装置４−１〜４−ｎの制御要求検
出部４１１は、センタ装置３から送られた切戻し要求を
検出して切戻し制御部４１３に通知する。切戻し制御部
４１３はこの切戻し要求に応じて、選択部４０２を予備
系から現用系へ復帰させる切戻し命令を送出し、さらに
センタ装置３に切戻し完了通知を送出する。これにより
切戻しシーケンスを終了し、センタ装置３および各ユー
ザ装置４−１〜４−ｎは予備系の故障定常状態となる。The control request detection unit 411 of each of the user devices 4-1 to 4-n detects the switchback request sent from the center device 3 and notifies the switchback control unit 413 of it. In response to the switchback request, the switchback control unit 413 sends a switchback command for returning the selection unit 402 from the backup system to the active system, and further sends a switchback completion notification to the center apparatus 3. As a result, the switchback sequence is completed, and the center device 3 and each of the user devices 4-1 to 4-n are in a failure steady state of the standby system.
【００３１】一方、比較部３１６における比較の結果、
予備系の故障数が現用系の故障数を下回るものであれ
ば、図３に示すように切戻しを行わず、切替え状態を継
続する。On the other hand, as a result of the comparison in the comparison unit 316,
If the number of failures in the backup system is less than the number of failures in the working system, the switching back state is continued without performing the switchback as shown in FIG.
【００３２】また、切替え状態中に予備系の故障を検出
したときに、比較部３１６が予備系の故障数と所定数Ｍ
とを比較し、切戻しの可否を判断するようにしてもよ
い。すなわち、予備系の故障数が所定数Ｍを上回った場
合に切戻しを行い、下回った場合には切戻しを行わず、
切替え状態を継続する。Further, when a failure of the standby system is detected during the switching state, the comparison unit 316 determines the number of failures of the standby system and the predetermined number M.
It may be possible to determine whether to perform the failback by comparing with. That is, the failback is performed when the number of failures in the backup system exceeds a predetermined number M, and is not performed when the number of failures is less than the predetermined number M.
Continue switching state.
【００３３】[0033]
【発明の効果】以上説明したように、本発明は、切替え
状態中に予備系の故障が検出されたときに、予備系の故
障数に応じて切戻しを行うか否かを判断することによ
り、現用系と予備系の各運用状態に応じた最善の系を選
択することができる。すなわち、切戻しによるサービス
悪化を防止することができる。As described above, according to the present invention, when the failure of the standby system is detected during the switching state, it is determined whether or not the switchback is performed according to the number of failures of the standby system. , The best system can be selected according to each operating state of the active system and the standby system. That is, it is possible to prevent the service deterioration due to the switchback.
【図１】本発明の切替え切戻し装置の実施例構成を示す
ブロック図。FIG. 1 is a block diagram showing a configuration of an embodiment of a switching cutback device of the present invention.
【図２】実施例の切替え切戻しシーケンス（切戻しを行
う場合）を示す図。FIG. 2 is a diagram showing a switching back-back sequence (when performing back-back) according to the embodiment.
【図３】実施例の切替え切戻しシーケンス（切戻しを行
わない場合）を示す図。FIG. 3 is a diagram showing a switchover failback sequence of the embodiment (when no failback is performed).
【図４】二重化パッシブスター光伝送システムの基本構
成を示すブロック図。FIG. 4 is a block diagram showing a basic configuration of a duplex passive star optical transmission system.
【図５】１対１伝送システムにおける切替え切戻し装置
の構成を示すブロック図。FIG. 5 is a block diagram showing the configuration of a switching back / back device in a one-to-one transmission system.
【図６】１対１伝送システムにおける切替えシーケンス
を示す図。FIG. 6 is a diagram showing a switching sequence in a one-to-one transmission system.
【図７】１対１伝送システムにおける切替え切戻しシー
ケンスを示す図。FIG. 7 is a diagram showing a switching back and forth sequence in the one-to-one transmission system.
【図８】二重化パッシブスター光伝送システムにおける
切戻しの問題点を示す図。FIG. 8 is a diagram showing a problem of switching back in the duplex passive star optical transmission system.
【図９】二重化パッシブスター光伝送システムにおける
切戻しの問題点を示す図。FIG. 9 is a diagram showing a problem of switchback in a duplex passive star optical transmission system.
１ 光伝送路 ２ 光スターカプラ ３ センタ装置 ４ ユーザ装置 ３０１，４０１ 送受信部 ３０２，４０２ 選択部 ３０３，４０３ 挿入部 ３１１，３２１ 故障検出部（現用系） ３１２，３２２ 切替え制御部 ３１３，３２３ 応答検出部 ３１４，３２４ 故障検出部（予備系） ３１５ タイマ ３１６ 比較部 ３１７，３２５ 切戻し制御部 ４１１，４２１ 制御要求検出部 ４１２，４２２ 切替え制御部 ４１３，４２３ 切戻し制御部 1 Optical Transmission Line 2 Optical Star Coupler 3 Center Device 4 User Equipment 301,401 Transmitter / Receiver Unit 302,402 Selector Unit 303,403 Insertion Unit 311,321 Failure Detection Unit (Active System) 312,322 Switching Control Unit 313,323 Response Detection Section 314, 324 failure detection section (standby system) 315 timer 316 comparison section 317, 325 switchback control section 411, 421 control request detection section 412, 422 switching control section 413, 423 switchback control section
Claims (3)
ッシブスター構成に接続されたセンタ装置と複数のユー
ザ装置とに備えられ、 現用系の故障によって予備系への切替えを行い、その切
替え状態中に予備系の故障が検出されたときに、現用系
へ復帰させる切戻しを行う切替え切戻し装置において、 前記切替え状態中に予備系の故障が検出されたときに、
予備系の故障数に応じて前記切戻しを行うか否かを判断
する判断手段を備えたことを特徴とする切替え切戻し装
置。1. A center device and a plurality of user devices connected to a dual passive star configuration via a dual optical transmission line, and are provided with a standby system due to a failure of an active system, and a switching state thereof. When a failure of the standby system is detected in the switching fail-back device for performing a fail back to restore the working system, when a failure of the standby system is detected during the switching state,
2. A switching fail-back device, comprising a judging means for judging whether or not to carry out the fail-back according to the number of failures in a backup system.
いて、 判断手段は、予備系の故障数と現用系の故障数とを比較
し、予備系の故障数が現用系の故障数を上回った場合に
切戻しを行い、予備系の故障数が現用系の故障数を下回
った場合に切替え状態を維持する構成であることを特徴
とする切替え切戻し装置。2. The switching back-back device according to claim 1, wherein the determination means compares the number of failures of the standby system with the number of failures of the active system, and the number of failures of the standby system exceeds the number of failures of the active system. A switching back-back device characterized in that the switching back is carried out when the number of failures in the standby system falls below the number of failures in the active system, and the switching state is maintained.
いて、 判断手段は、予備系の故障数と所定数とを比較し、予備
系の故障数が所定数を上回った場合に切戻しを行い、予
備系の故障数が所定数を下回った場合に切替え状態を維
持する構成であることを特徴とする切替え切戻し装置。3. The switching back-back device according to claim 1, wherein the judging means compares the number of failures of the backup system with a predetermined number, and performs a switching back when the number of failures of the backup system exceeds a predetermined number. A switching back-and-turning device, which is configured to maintain a switching state when the number of failures in the backup system falls below a predetermined number.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP15493294A JP3322482B2 (en) | 1994-07-06 | 1994-07-06 | Switching and switching back device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP15493294A JP3322482B2 (en) | 1994-07-06 | 1994-07-06 | Switching and switching back device |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH0823304A true JPH0823304A (en) | 1996-01-23 |
| JP3322482B2 JP3322482B2 (en) | 2002-09-09 |
Family
ID=15595099
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP15493294A Expired - Fee Related JP3322482B2 (en) | 1994-07-06 | 1994-07-06 | Switching and switching back device |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP3322482B2 (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPWO2002049290A1 (en) * | 2000-12-15 | 2004-04-15 | 三菱電機株式会社 | Optical multi-branch communication system |
| JP2005198286A (en) * | 2004-01-02 | 2005-07-21 | Samsung Electronics Co Ltd | Bi-directional wavelength division multiplexing self-healing passive optical subscriber network |
-
1994
- 1994-07-06 JP JP15493294A patent/JP3322482B2/en not_active Expired - Fee Related
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPWO2002049290A1 (en) * | 2000-12-15 | 2004-04-15 | 三菱電機株式会社 | Optical multi-branch communication system |
| JP2005198286A (en) * | 2004-01-02 | 2005-07-21 | Samsung Electronics Co Ltd | Bi-directional wavelength division multiplexing self-healing passive optical subscriber network |
Also Published As
| Publication number | Publication date |
|---|---|
| JP3322482B2 (en) | 2002-09-09 |
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