JPH0818594A - Active standby changeover system - Google Patents
Active standby changeover systemInfo
- Publication number
- JPH0818594A JPH0818594A JP6144815A JP14481594A JPH0818594A JP H0818594 A JPH0818594 A JP H0818594A JP 6144815 A JP6144815 A JP 6144815A JP 14481594 A JP14481594 A JP 14481594A JP H0818594 A JPH0818594 A JP H0818594A
- Authority
- JP
- Japan
- Prior art keywords
- switching
- unit
- active
- failure
- standby
- 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
- Data Exchanges In Wide-Area Networks (AREA)
- Small-Scale Networks (AREA)
- Maintenance And Management Of Digital Transmission (AREA)
- Detection And Prevention Of Errors In Transmission (AREA)
Abstract
Description
【0001】[0001]
【産業上の利用分野】本発明は通信網に利用する。本発
明はスター状に構成されたネットワークに利用するに適
する。本発明は、障害による影響を最小限に抑える技術
に関する。The present invention is used in communication networks. The present invention is suitable for use in a star-shaped network. The present invention relates to a technique for minimizing the influence of a failure.
【0002】[0002]
【従来の技術】通信網における障害発生時の通信を確保
するために、冗長系の伝送路を備えた現用予備切替方式
が広く用いられている。この従来例を図4を参照して説
明する。図4は従来例の構成を示す図である。装置a、
装置bはそれぞれ現用系および予備系のそれぞれ二組の
送受信部411 、412 、511 、512 を有する。伝
送路301 、302 は装置aと装置bとの通信を伝達す
る。選択部42、52はそれぞれ現用系および予備系を
切替える。故障検出部43は、現用系の伝送路301 の
故障情報を検出する。切替要求発生部44は、故障検出
部43の故障あり信号により装置bの選択部52の切替
要求を発生する。切替制御要求検出部53は装置aから
の装置bの選択部52の切替要求または切替なし通知を
検出する。切替命令発生部54は切替制御要求検出部5
3の切替要求信号により装置bの選択部52の切替命令
を発生する。切替応答発生部55は、選択部52が切替
わったことを装置aに転送する。切替制御応答検出部4
5は装置bの選択部52の切替応答信号を検出する。切
替命令発生部46は切替制御応答検出部45からの信号
を受信し装置bが切替わったことを確認した後に装置a
の切替命令を発生する。切替なし通知発生部47は故障
検出部43の故障なし信号により装置bに切替がないこ
とを通知する。切替なし通知発生部56は切替制御要求
検出部53の切替なし通知信号より装置aに伝送路30
1 、302 の名称を変更したことを通知する。通知は装
置aと装置bとの間で行われる。2. Description of the Related Art In order to ensure communication when a failure occurs in a communication network, an active backup switching system having a redundant transmission line is widely used. This conventional example will be described with reference to FIG. FIG. 4 is a diagram showing a configuration of a conventional example. Device a,
The device b has two sets of transmission / reception units 41 1 , 41 2 , 51 1 and 51 2 for the active system and the standby system, respectively. The transmission lines 30 1 and 30 2 convey communication between the device a and the device b. The selection units 42 and 52 switch the active system and the standby system, respectively. The failure detection unit 43 detects failure information of the active transmission line 30 1 . The switching request generation unit 44 generates a switching request for the selection unit 52 of the device b in response to the failure signal of the failure detection unit 43. The switching control request detection unit 53 detects the switching request or the non-switching notification of the selection unit 52 of the device b from the device a. The switching command generation unit 54 includes the switching control request detection unit 5
A switching command of the selector 52 of the device b is generated by the switching request signal of No. 3. The switching response generation unit 55 transfers the fact that the selection unit 52 has switched to the device a. Switching control response detector 4
Reference numeral 5 detects the switching response signal of the selection unit 52 of the device b. The switching command generation unit 46 receives the signal from the switching control response detection unit 45 and confirms that the device b is switched, and then the device a
Generates a switching instruction. The non-switching notification generating unit 47 notifies the device b that there is no switching by the no-failure signal of the failure detecting unit 43. The non-switching notification generating unit 56 sends the transmission line 30 to the device a based on the non-switching notification signal of the switching control request detecting unit 53.
Notify that the names of 1 and 30 2 have been changed. The notification is performed between the device a and the device b.
【0003】装置aの送受信部411 および下りの伝送
路301 の故障状況は上りの現用系の伝送路301 によ
り装置aに伝えられ、装置bの現用系の送受信部5
11 、および上り現用系の伝送路301 の故障状況は下
り現用系の伝送路301 で装置bに伝えられる。伝送路
301 で通信が行われていると、何らかの原因で送受信
部411 、511 、伝送路301 に故障が発生した場合
の従来技術によるシーケンスを図5および図6を参照し
て説明する。図5は従来例のシーケンスを示す図であ
る。図6は従来例の現用系の送受信部411 、511 ま
たは伝送路301 に故障が発生した後に、装置bで切替
が行われなかった場合のシーケンスを示す図である。図
5に示すように、装置aで現用系の故障を検出すると
(S1)、故障検出より故障と判断する切替要求保護時
間(Ta)後に(S2)、切替要求を装置bに転送する
(S3)。装置bでは切替要求を受信後、送受信部51
1 を選択部52により予備系の送受信部512 に切替え
(S4)、切替応答を装置aに転送する(S5)。装置
aでは切替応答を受信後に、送受信部411 を選択部4
2により予備系の送受信部412 に切替える(S6)。
装置aで現用系の故障回復を検出すると(S7)、故障
回復検出より回復と判断する回復確認保護時間(Tb)
をカウントする(S8)。Tb終了後、切替なし通知を
装置bに転送する(S9)。装置bでは切替なし通知を
受信後、伝送路301 、302 の名称を変更する(S1
0)。すなわち、現用系を予備系に変更し、予備系を現
用系に変更する。装置aに切替なし通知を転送する(S
11)。装置aでは、切替なし通知を受信後に、伝送路
301 、302 の名称を変更する(S12)。すなわ
ち、現用系を予備系に変更し、予備系を現用系に変更す
る。The failure status of the transmission / reception unit 41 1 of the device a and the downstream transmission line 30 1 is transmitted to the device a by the upstream active transmission line 30 1 , and the active transmission / reception unit 5 of the device b.
The failure statuses of 1 1 and the upstream active transmission line 30 1 are transmitted to the device b through the downstream active transmission line 30 1 . When the communication with the transmission line 30 1 is being performed, with reference to FIGS. 5 and 6 the sequence according to the prior art when the transmission and reception unit 41 1, 51 1, is a fault in the transmission line 30 1 has occurred for some reason described To do. FIG. 5 is a diagram showing a sequence of a conventional example. FIG. 6 is a diagram showing a sequence in the case where the switching is not performed in the device b after a failure occurs in the transmission / reception units 41 1 , 51 1 of the active system or the transmission line 30 1 of the conventional example. As shown in FIG. 5, when the device a detects a failure in the active system (S1), the switching request is transferred to the device b (S3) after the switching request protection time (Ta), which is determined to be a failure based on the failure detection (S2), (S3). ). The device b receives the switching request,
The selection unit 52 switches 1 to the standby transmission / reception unit 51 2 (S4), and transfers the switching response to the device a (S5). In the device a, after receiving the switching response, the transmitting / receiving unit 41 1 is selected
2 switches to the standby transmission / reception unit 41 2 (S6).
When the device a detects a failure recovery of the active system (S7), the recovery confirmation protection time (Tb) for judging the recovery from the failure recovery detection
Is counted (S8). After the end of Tb, the notification of no switching is transferred to the device b (S9). After receiving the notification of no switching, the device b changes the names of the transmission lines 30 1 and 30 2 (S1).
0). That is, the active system is changed to the standby system, and the standby system is changed to the active system. Transfer the non-switching notification to the device a (S
11). In the device a, after receiving the notification of no switching, the names of the transmission lines 30 1 and 30 2 are changed (S12). That is, the active system is changed to the standby system, and the standby system is changed to the active system.
【0004】図6は、装置bで切替が行われなかった場
合であり、装置aに切替応答が戻ってこなかったとき
は、遷移状態を変えず現用系の回復を待つ。装置aで現
用系の故障回復を検出すると回復確認保護時間(Tb)
をカウント後、装置bに切替なし通知を転送し切替制御
を終了する。FIG. 6 shows a case in which the switching is not performed in the device b, and when the switching response is not returned to the device a, the transition state is not changed and the recovery of the active system is waited. When device a detects a failure recovery of the active system, recovery confirmation protection time (Tb)
After counting, the notification of no switching is transferred to the device b, and the switching control ends.
【0005】[0005]
【発明が解決しようとする課題】このような現用予備切
替方式では、ポイント−ポイントの切替方式であるため
切替応答未受信後、現用系回復で切替なし通知を送出し
ても正常動作したが、ポイント−マルチポイント(主装
置−従装置)の場合には各従装置が同じ動作をするとは
限らないため、主装置で従装置の管理ができなくなって
しまう。In such an active backup switching method, since it is a point-to-point switching method, it operates normally even if a switching-notification is sent by the recovery of the active system after the switching response is not received. In the case of point-multipoint (main device-slave device), each slave device does not always perform the same operation, and thus the master device cannot manage the slave device.
【0006】この場合の問題点を図7を参照して説明す
る。図7は従来例の問題点を説明するための図である。
図7(a)に示すように、現用系(0系)の分岐結合器
と装置biの間(個別部)に故障が発生した場合、1系
の伝送路で全装置bi(装置b1〜装置bn)に切替要
求を送出する。図7(b)は何らかの原因で装置b2の
切替が行われなかった場合であり、装置aは全ての装置
biより切替応答待ちの状態を続けている。この状態の
続行中に現用系故障回復を装置aが検出すると、全装置
biに切替なし通知を送出する。この切替なし通知を受
信した各装置biは選択部52の状態が異なるため、異
なる動作をしてしまう。この状態を示しているのが図7
(c)である。装置b1、bnは選択部52を予備系に
切り替えているので切替なし通知で伝送路301 、30
2 の名称変更をしてしまう。装置b2は選択部52を切
替えていないため切替動作を終了してしまう。このよう
に一つの系(0系、1系)の中に現用系と予備系とが混
在してしまう。The problem in this case will be described with reference to FIG. FIG. 7 is a diagram for explaining the problems of the conventional example.
As shown in FIG. 7A, when a failure occurs between the branch coupler of the active system (0 system) and the device bi (individual part), all the devices bi (devices b1 to devices b1 to b1) The switching request is sent to bn). FIG. 7B shows a case in which the device b2 is not switched for some reason, and the device a continues to wait for a switching response from all the devices bi. When the device a detects recovery of the active system failure while continuing this state, it sends a notification of no switching to all devices bi. The devices bi that have received the notification of no switching have different states of the selection unit 52, and thus perform different operations. This state is shown in FIG.
It is (c). Since the devices b1 and bn switch the selecting unit 52 to the standby system, the transmission lines 30 1 and 30
The name of 2 is changed. Since the device b2 has not switched the selection unit 52, the switching operation ends. In this way, the active system and the standby system coexist in one system (0 system, 1 system).
【0007】一つの系(0系、1系)の中に現用系と予
備系とが混在してしまう場合のシーケンスを図8を参照
して説明する。図8は一つの系(0系、1系)の中に現
用系と予備系とが混在してしまう場合のシーケンスを示
す図である。図8に示すように、装置aで現用系の故障
を検出すると(S11)、故障検出より故障と判断する
切替要求保護時間(Ta)後に(S12)、切替要求を
装置bに転送する(S13)。このとき装置b1は何ら
かの原因により、切替要求が到来したにも係わらず切替
動作を行わない(S14)。他の装置b2〜bnでは切
替要求を受信後、送受信部511 を選択部52により予
備系の送受信部512 に切替え(S15)、切替応答を
装置aに転送する(S16)。装置aでは切替応答を受
信後に、送受信部411 を選択部42により予備系の送
受信部412 に切替える(S17)。装置aで現用系の
故障回復を検出すると(S18)、故障回復検出より回
復と判断する回復確認保護時間(Tb)をカウントする
(S19)。Tb終了後、切替なし通知を装置bに転送
する(S20)。この切替なし通知も装置b1は受理し
ない(S21)。装置b2〜bnでは切替なし通知を受
信後、伝送路301、302 の名称を変更する(S2
2)。すなわち、現用系を予備系に変更し、予備系を現
用系に変更する。装置aに切替なし通知を転送する(S
23)。装置aでは、切替なし通知を受信後に、伝送路
301 、302 の名称を変更する(S24)。すなわ
ち、現用系を予備系に変更し、予備系を現用系に変更す
る。このようにして一つの系(0系、1系)の中に現用
系と予備系とが混在してしまう。このような状況では、
主装置である装置aは、従装置である装置b1〜bnの
現用予備切替状態を全て把握することができないため、
現用予備切替方式の有効な運用は不可能である。A sequence in the case where the active system and the standby system are mixed in one system (0 system, 1 system) will be described with reference to FIG. FIG. 8 is a diagram showing a sequence when the active system and the standby system are mixed in one system (0 system, 1 system). As shown in FIG. 8, when the device a detects a failure in the active system (S11), the switching request is transferred to the device b (S13) after the switching request protection time (Ta) in which the failure is determined from the failure detection (Ta) (S12). ). At this time, the device b1 does not perform the switching operation for some reason despite the arrival of the switching request (S14). After receiving the switching request, the other devices b2 to bn switch the transmission / reception unit 51 1 to the standby transmission / reception unit 51 2 by the selection unit 52 (S15), and transfer the switching response to the device a (S16). After receiving the switching response, the device a switches the transmission / reception unit 41 1 to the standby transmission / reception unit 41 2 by the selection unit 42 (S17). When the device a detects the failure recovery of the active system (S18), the recovery confirmation protection time (Tb) which is judged as the recovery from the failure recovery detection is counted (S19). After the end of Tb, the notification of no switching is transferred to the device b (S20). The device b1 also does not accept this notification of no switching (S21). After receiving the notification of no switching, the devices b2 to bn change the names of the transmission lines 30 1 and 30 2 (S2).
2). That is, the active system is changed to the standby system, and the standby system is changed to the active system. Transfer the non-switching notification to the device a (S
23). The device a changes the names of the transmission lines 30 1 and 30 2 after receiving the notification of no switching (S24). That is, the active system is changed to the standby system, and the standby system is changed to the active system. In this way, the active system and the standby system are mixed in one system (0 system, 1 system). In this situation,
Since the device a, which is the main device, cannot grasp all the active standby switching states of the devices b1 to bn, which are the slave devices,
The effective operation of the active standby switching method is impossible.
【0008】例えば、装置bnの現用系に故障が発生す
ると、装置aは現用予備切替要求を装置b1〜bnに送
出する。これにより、装置bnの通信は復旧する。しか
し、このとき装置biが何らかの原因により切替動作を
行わない場合に、装置aはこれを把握することができな
い。続いて、装置biに故障が発生したとき、装置bi
は現在の予備系(切替前の現用系)により通信を行って
いるため、その故障は予備系の故障を示しているのだが
装置aはこれを認識することができずに、切替要求を送
出する。装置biは切替機能に障害が存在しているの
で、切替を実行できずに引き続き通信が不通になる。し
かし、切替要求により装置bnも切替を行う。このと
き、装置bnの前回の現用系は未だに復旧しておらず、
装置bnは故障側に切替られてしまい通信が不通にな
る。すなわち、現用予備切替を行ったために、二つの装
置biおよびbnの通信が不通になる。このように現用
予備切替を行うことが逆に障害状況を拡大させることも
ありうる。For example, when a failure occurs in the active system of the device bn, the device a sends an active backup switching request to the devices b1 to bn. As a result, the communication of the device bn is restored. However, at this time, if the device bi does not perform the switching operation for some reason, the device a cannot grasp this. Then, when a failure occurs in the device bi, the device bi
Is communicating with the current standby system (active system before switching), the failure indicates a failure of the standby system, but device a cannot recognize this and sends a switching request. To do. Since the device bi has a failure in the switching function, the switching cannot be executed and the communication continues to be interrupted. However, the device bn also switches according to the switching request. At this time, the previous working system of the device bn has not been restored yet,
The device bn is switched to the failure side and communication is cut off. That is, the communication between the two devices bi and bn is cut off because the active standby switching is performed. In this way, performing the active spare switching may conversely expand the failure situation.
【0009】本発明は、このような背景に行われたもの
であり、一つの系(0系、1系)の中に現用系と予備系
とが混在することを回避することができる現用予備切替
方式を提供することを目的とする。本発明は、障害によ
る影響を最小限に抑えることができる現用予備切替方式
を提供することを目的とする。The present invention has been made against such a background, and it is possible to avoid a mixture of an active system and a standby system in one system (0 system, 1 system). The purpose is to provide a switching method. It is an object of the present invention to provide an active backup switching system that can minimize the influence of a failure.
【0010】[0010]
【課題を解決するための手段】本発明は、現用予備切替
に先だって従装置の切替機能の検査を行うことにより、
一つの系(0系、1系)の中に現用系と予備系とが混在
することを回避することを特徴とする。すなわち、本発
明は、現用系および予備系の通信系統をそれぞれ備えた
一つの主装置と複数の従装置とを備え、この主装置には
前記従装置の障害を検出する手段と、この検出する手段
が障害を検出したときに前記現用系を前記予備系に切替
える手段とを備えた現用予備切替方式である。According to the present invention, the inspection of the switching function of the slave device is performed prior to the active standby switching.
It is characterized in that the active system and the standby system are prevented from being mixed in one system (0 system, 1 system). That is, the present invention is provided with one master device and a plurality of slave devices each having an active communication system and a standby communication system, and this master device has means for detecting a failure of the slave device and this And a means for switching the active system to the standby system when the means detects a failure.
【0011】ここで、本発明の特徴とするところは、障
害が検出されたときに前記切替える手段の前記従装置側
のすべてについて正常性を検査する手段と、少なくとも
一つの前記従装置についてこの検査する手段の検査結果
が異常を示すときすべての前記従装置について切替えを
禁止する手段とを備えることにある。Here, a feature of the present invention resides in a means for inspecting the normality of all of the slaves of the switching means when a failure is detected, and this inspection for at least one slave. And a means for prohibiting switching of all the slave devices when the inspection result of the means indicates an abnormality.
【0012】これにより、従装置の切替不能を現用予備
切替に先だって察知し、一つの系に現用系と予備系とが
混在する状況を回避することができる。With this, it is possible to detect the switching failure of the slave device prior to the active standby switching, and avoid a situation in which the active system and the standby system coexist in one system.
【0013】前記検査する手段は、前記主装置から通信
系統の下り回線を介して前記従装置のそれぞれに対し質
問信号を送信する手段と、この質問信号に対して前記各
従装置からその通信系統の上り回線を介して応答信号を
送信する手段と、この応答信号を受信し分析する手段と
を含むことが望ましい。The inspecting means includes means for transmitting an inquiry signal from the main device to each of the slave devices via a downlink of the communication system, and the communication system from each of the slave devices for the inquiry signal. It is desirable to include means for transmitting a response signal through the uplink and the means for receiving and analyzing the response signal.
【0014】これにより、検査のための専用回線を設け
る必要がなく、設置工数を低減することができる。ま
た、ハードウェア構成を簡単化することができる。As a result, it is not necessary to provide a dedicated line for inspection, and the number of installation steps can be reduced. Also, the hardware configuration can be simplified.
【0015】下り回線の質問信号は前記従装置の各切替
制御部に取り込まれ、応答信号はこの切替制御部から上
り回線に送信されることが望ましい。さらに、前記切替
制御部には検査部を備え、この検査部にはその切替制御
部に取り込まれた信号が検査信号であるとき切替選択部
の正常性を検査する手段を含むことが望ましい。これに
より、検査を効率よく高速に行うことができる。It is preferable that the inquiry signal of the downlink is taken in by each switching control unit of the slave device, and the response signal is transmitted from the switching control unit to the uplink. Further, it is preferable that the switching control unit includes an inspection unit, and the inspection unit includes means for inspecting the normality of the switching selection unit when the signal fetched by the switching control unit is an inspection signal. Thereby, the inspection can be performed efficiently and at high speed.
【0016】[0016]
【作用】現用系および予備系の通信系をそれぞれ備えた
一つの主装置と複数の従装置とを備え、この主装置は従
装置の障害を検出すると、現用系を予備系に切替える。
このとき、障害が検出されたときに切替える手段の従装
置側のすべてについて正常性を検査し、少なくとも一つ
の従装置についてこの検査結果が異常を示すときすべて
の従装置について切替えを禁止する。The present invention is provided with one master unit and a plurality of slave units each having a working communication system and a standby communication system, and this master unit switches the working system to the standby system when a failure of the slave unit is detected.
At this time, the normality is inspected for all of the slaves of the switching means when a failure is detected, and switching is prohibited for all slaves when the inspection result shows an abnormality for at least one slave.
【0017】これにより、従装置の切替不能を現用予備
切替に先だって察知し、一つの系に現用系と予備系とが
混在する状況を回避することができる。As a result, it is possible to detect that the slave device cannot be switched prior to the active standby switching, and avoid a situation in which the active system and the standby system coexist in one system.
【0018】検査は、主装置から通信系統の下り回線を
介して従装置のそれぞれに対し質問信号を送信し、この
質問信号に対して各従装置からその通信系統の上り回線
を介して応答信号を送信する。主装置ではこの応答信号
を受信し分析することがよい。In the inspection, an inquiry signal is transmitted from the main device to each of the slave devices via the downlink of the communication system, and in response to this inquiry signal, a response signal is sent from each slave device via the uplink of the communication system. To send. The main unit preferably receives and analyzes this response signal.
【0019】これにより、検査のための専用回線を設け
る必要がなく、設置工数を低減することができる。ま
た、ハードウェア構成を簡単化することができる。As a result, it is not necessary to provide a dedicated line for inspection, and the number of installation steps can be reduced. Also, the hardware configuration can be simplified.
【0020】下り回線の質問信号は従装置の各切替制御
部に取り込まれ、応答信号はこの切替制御部から上り回
線に送信されることがよい。さらに、この切替制御部に
は検査部を備え、この検査部にはその切替制御部に取り
込まれた信号が検査信号であるとき切替選択部の正常性
を検査することがよい。It is preferable that the inquiry signal of the downlink is taken in by each switching control unit of the slave device and the response signal is transmitted from the switching control unit to the uplink. Further, it is preferable that the switching control unit includes an inspection unit, and the inspection unit inspects the normality of the switching selection unit when the signal taken in by the switching control unit is an inspection signal.
【0021】[0021]
【実施例】本発明実施例の構成を図1を参照して説明す
る。図1は本発明実施例の全体構成図である。DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The configuration of an embodiment of the present invention will be described with reference to FIG. FIG. 1 is an overall configuration diagram of an embodiment of the present invention.
【0022】本発明は、現用系および予備系の通信系を
それぞれ備えた一つの主装置としての装置aと複数の従
装置としての装置b1〜bnとを備え、この装置aには
装置b1〜bnの障害を検出する手段としての故障検出
部13と、この故障検出部13が障害を検出したときに
前記現用系を前記予備系に切替える手段としての切替制
御部10、20および選択部12、22とを備えた現用
予備切替方式である。The present invention comprises a device a as one main device and a plurality of devices b1 to bn as slave devices, each of which has an active communication system and a standby communication system, and the devices b1 to bn are included in this device a. a failure detection unit 13 as a means for detecting a failure of bn, and switching control sections 10 and 20 and a selection unit 12 as means for switching the active system to the standby system when the failure detection unit 13 detects a failure. 22 is a working standby switching system.
【0023】ここで、本発明の特徴とするところは、障
害が検出されたときに切替制御部10、20および選択
部12、22の従装置側のすべてについて正常性を検査
する手段としての装置aに設けられた切替部検査信号発
生部15および装置b1〜bnに設けられた検査部24
および切替部検査応答発生部25と、少なくとも一つの
装置b1、b2、…、bnについてこの検査結果が異常
を示すときすべての装置b1〜bnについて切替えを禁
止する手段を含む切替要求発生部17とを備えるところ
にある。Here, a feature of the present invention is that a device as a means for inspecting the normality of all of the switching control units 10 and 20 and the selection units 12 and 22 on the slave side when a failure is detected. a switching section inspection signal generator 15 provided in a and an inspection section 24 provided in the devices b1 to bn
And a switching request generation unit 17 including a switching unit inspection response generation unit 25, and a unit that prohibits switching of all the devices b1 to bn when the inspection result shows an abnormality for at least one of the devices b1, b2, ..., Bn. Is in place.
【0024】装置aは、下り信号を送出する主装置であ
る。送受信部111 、112 は伝送路301 、302 に
信号を送信、あるいは伝送路301 、302 から受信し
た信号からタイミング抽出を行って装置内部処理に対応
した符号列を形成する。故障検出部13は、送受信部1
11 、112 からの制御信号により装置b1〜bnの現
用系の故障を検出する。切替なし通知発生部14は、故
障検出部13で故障検出をしなかったときに切替なし通
知を発生する。切替部検査信号発生部15は、故障検出
部13で故障検出をしたときに装置b1〜bnに切替部
検査信号を発生する。切替制御応答受信部16は、送受
信部111 、112 からの制御信号を受信し切替部検査
応答、切替応答、切替なし通知を振り分ける。切替要求
発生部17は、切替制御応答受信部16から検査応答を
受け装置b1〜bnの検査応答受信時に切替要求を送出
する。切替命令発生部18は、切替制御応答受信部16
から切替応答を受け装置b1〜bnの切替応答受信時に
装置aの選択部12の切替命令を発生する。選択部12
は切替命令発生部18の制御信号により送受信部1
11 、112 のいずれかの信号を選択する。The device a is a main device for transmitting a downlink signal. Transceiver 11 1, 11 2 forms a code sequence corresponding to the transmission path 30 1, 30 2 sends a signal to, or the transmission line 30 1, 30 device internal processing performed timing extracted from the received signals from two. The failure detection unit 13 is the transmission / reception unit 1
The failure of the active system of the devices b1 to bn is detected by the control signals from 1 1 and 11 2 . The non-switching notification generating unit 14 generates a non-switching notification when the failure detecting unit 13 does not detect a failure. The switching unit inspection signal generation unit 15 generates a switching unit inspection signal to the devices b1 to bn when the failure detection unit 13 detects a failure. The switching control response reception unit 16 receives the control signals from the transmission / reception units 11 1 and 11 2 and distributes the switching unit inspection response, the switching response, and the non-switching notification. The switching request generator 17 receives the inspection response from the switching control response receiver 16 and sends out the switching request when the inspection responses of the devices b1 to bn are received. The switching command generating unit 18 includes the switching control response receiving unit 16
When the switching response is received from the devices b1 to bn, a switching command for the selection unit 12 of the device a is generated. Selector 12
Is the transmission / reception unit 1 according to the control signal of the switching instruction generation unit 18.
Either the signal 1 1 or 11 2 is selected.
【0025】装置b1〜bnは、上り信号を送出する従
装置である。送受信部211 、212 は伝送路321 、
322 に信号を送信、あるいは伝送路321 、322 か
ら受信した信号からタイミング抽出を行って装置内部処
理に対応した符号列を形成する。切替制御要求受信部2
3は、送受信部211 、212 からの制御信号を受け切
替部検査信号、切替要求、切替なし通知に振り分ける。
検査部24は、切替制御要求受信部23から切替部検査
信号を受信したときに切替制御部20および選択部22
を検査する。切替部検査応答発生部25は検査部24で
の結果が良好のときに検査応答を送出する。切替命令発
生部26は切替制御要求受信部23から切替要求を受信
したときに装置b1〜bnの選択部22の切替命令を発
生する。切替応答発生部27は選択部22が切り替わっ
たことを装置aに転送する。切替なし通知発生部28は
切替状態時(切替応答発出時)に切替制御要求受信部2
3から切替なし通知を受信したときに装置aに切替なし
通知を送出し、伝送路名称変更を行う。選択部22は、
切替命令発生部26の制御信号により送受信部211 、
212 のいずれかの信号を選択する。伝送路301 、3
02 は装置aに接続される。伝送路321 、322 は装
置b1〜bnに接続される。分岐結合器311 、312
は、伝送路301 、302 からの信号をそのままn本の
伝送路321、322 に分岐するかあるいはn本の伝送
路321 、322 からの信号をそのまま結合し1本の伝
送路301 、302 に出力する。このような構成により
装置aは切替部検査信号発生部15の検査信号で装置b
1〜bnの切替制御部20の検査を実行させ、その結果
すべての装置b1〜bnの応答を確認後、装置b1〜b
nの選択部22の切替動作に移る。The devices b1 to bn are slave devices for transmitting upstream signals. The transmission / reception units 21 1 and 21 2 have transmission lines 32 1 and
A signal is transmitted to 32 2 or timing is extracted from the signals received from the transmission paths 32 1 and 32 2 to form a code string corresponding to the internal processing of the apparatus. Switching control request receiver 2
3 receives the control signals from the transmission / reception units 21 1 and 21 2 and distributes the control signals to the switching unit inspection signal, the switching request, and the notification of no switching.
When the inspection unit 24 receives the switching unit inspection signal from the switching control request reception unit 23, the switching control unit 20 and the selection unit 22.
To inspect. The switching unit inspection response generation unit 25 sends out an inspection response when the result of the inspection unit 24 is good. The switching command generating unit 26 generates a switching command for the selecting unit 22 of the devices b1 to bn when receiving the switching request from the switching control request receiving unit 23. The switching response generation unit 27 transfers the fact that the selection unit 22 has switched to the device a. The no-switch notification generation unit 28 switches the switching control request reception unit 2 in the switching state (when a switching response is issued).
When the notification of no switching is received from 3, the notification of no switching is sent to the device a, and the transmission path name is changed. The selection unit 22
The transmission / reception unit 21 1 , according to the control signal of the switching command generation unit 26,
Select one of the signals of 21 2 . Transmission lines 30 1 , 3
0 2 is connected to the device a. The transmission lines 32 1 and 32 2 are connected to the devices b1 to bn. Branch couplers 31 1 and 31 2
Is to branch the signals from the transmission lines 30 1 and 30 2 to the n transmission lines 32 1 and 32 2 as they are, or to combine the signals from the n transmission lines 32 1 and 32 2 as they are to form one transmission line. Output to the paths 30 1 and 30 2 . With this configuration, the device a receives the inspection signal from the switching unit inspection signal generator 15 and outputs the device b.
1 to bn, the inspection of the switching control unit 20 is executed, and after confirming the responses of all the devices b1 to bn, the devices b1 to bn are checked.
Then, the switching operation of the n selection unit 22 is performed.
【0026】次に、本発明実施例の動作を図2および図
3を参照して説明する。図2は装置b1〜bnの切替制
御部20および選択部22が正常である場合の動作を示
すシーケンスを示す図である。図3は装置b1の切替制
御部20および選択部22が異常の場合のシーケンスを
示す図である。図2に示すように、装置aで現用系の故
障を検出すると(S31)、切替要求保護時間(Ta)
後に(S32)、装置b1〜bnに切替部検査信号発生
部15より切替検査信号を転送する(S33)。装置b
1〜bnでは検査部24により切替制御部20および選
択部22を検査し(S34、S35)、装置aに、切替
部検査応答発生部25より検査応答を転送する(S3
6)。装置aでは装置b1〜bnの検査応答を受信する
と(S37)、装置b1〜bnに切替要求を転送する
(S38)。装置b1〜bnでは切替要求を受信すると
選択部22の切替を行い(S39、S40)、装置a
に、切替応答発生部27から切替応答を転送する(S4
1)。装置aはすべての装置b1〜bnからの切替応答
を受信すると装置aの選択部12を切替える(S4
2)。その後、装置aで現用系故障回復を検出すると
(S43)、回復確認保護時間(Tb)をカウントし
(S44)、装置b1〜bnに切替なし通知を転送する
(S45)。装置b1〜bnでは伝送路名称を変更し
(S46、S47)、装置aに切替なし通知を転送する
(S48)。装置aでは伝送路名称を変更し切替動作を
終了する(S49)。Next, the operation of the embodiment of the present invention will be described with reference to FIGS. FIG. 2 is a diagram showing a sequence showing an operation when the switching control unit 20 and the selection unit 22 of the devices b1 to bn are normal. FIG. 3 is a diagram showing a sequence when the switching control unit 20 and the selection unit 22 of the device b1 are abnormal. As shown in FIG. 2, when the failure of the active system is detected by the device a (S31), the switching request protection time (Ta)
Later (S32), the switching inspection signal is transferred from the switching inspection signal generator 15 to the devices b1 to bn (S33). Device b
In 1 to bn, the inspection unit 24 inspects the switching control unit 20 and the selection unit 22 (S34, S35), and transfers the inspection response from the switching unit inspection response generation unit 25 to the device a (S3).
6). When the device a receives the inspection response from the devices b1 to bn (S37), the switching request is transferred to the devices b1 to bn (S38). Upon receiving the switching request, the devices b1 to bn switch the selection unit 22 (S39, S40), and the device a
Then, the switching response is transferred from the switching response generating unit 27 (S4
1). When the device a receives the switching responses from all the devices b1 to bn, the device a switches the selection unit 12 of the device a (S4).
2). After that, when the device a detects the recovery of the active system failure (S43), the recovery confirmation protection time (Tb) is counted (S44), and the non-switching notification is transferred to the devices b1 to bn (S45). The devices b1 to bn change the transmission path name (S46, S47) and transfer the non-switching notification to the device a (S48). The device a changes the transmission path name and ends the switching operation (S49).
【0027】図3に示すように、装置aで現用系の故障
を検出すると(S51)、切替要求保護時間(Ta)後
に(S52)、切替検査信号を装置b1〜bnに転送す
る(S53)。装置b1〜bnでは切替制御部20およ
び選択部22を検査し(S54、S55)、装置aに検
査応答を転送するが(S56)、装置b1では何らかの
故障で検査応答を転送しない。装置aでは、全ての検査
応答が戻って来ないため状態を移さずに待機する(S5
7)。この待機中に装置aで現用系故障回復を検出する
と(S58)、回復確認保護時間(Tb)をカウントし
(S59)、装置b1〜bnに切替なし通知を転送し
(S60)、切替動作を終了する。このように、切替制
御部20および選択部22を検査することにより、異常
を装置b1〜bnが存在した場合には選択部22の切替
えを実行しないため、一つの系(0系、1系)の中に現
用系と予備系とが混在することを回避することができ
る。As shown in FIG. 3, when the device a detects a failure in the active system (S51), after the switching request protection time (Ta) (S52), the switching inspection signal is transferred to the devices b1 to bn (S53). . The devices b1 to bn inspect the switching control unit 20 and the selection unit 22 (S54, S55) and transfer the inspection response to the device a (S56), but the device b1 does not transfer the inspection response due to some failure. In the device a, all the inspection responses are not returned, so the device a stands by without shifting the state (S5).
7). When the active fault recovery is detected by the device a during this standby (S58), the recovery confirmation protection time (Tb) is counted (S59), and the notification of no switching is transferred to the devices b1 to bn (S60) to perform the switching operation. finish. In this way, by inspecting the switching control unit 20 and the selection unit 22, the switching of the selection unit 22 is not executed when there is an abnormality in the devices b1 to bn, so one system (0 system, 1 system) is not executed. It is possible to prevent the active system and the standby system from being mixed in.
【0028】[0028]
【発明の効果】以上説明したように、本発明によれば、
一つの系(0系、1系)の中に現用系と予備系とが混在
することを回避することができる現用予備切替方式を実
現することができる。本発明によれば、障害による影響
を最小限に抑えることができる現用予備切替方式を実現
することができる。As described above, according to the present invention,
It is possible to realize an active backup switching method that can prevent the active system and the standby system from being mixed in one system (0 system, 1 system). According to the present invention, it is possible to realize an active backup switching method that can minimize the influence of a failure.
【図1】本発明実施例の全体構成図。FIG. 1 is an overall configuration diagram of an embodiment of the present invention.
【図2】装置b1〜bnの切替制御部および選択部が正
常である場合の動作を示すシーケンスを示す図。FIG. 2 is a diagram showing a sequence showing an operation when the switching control unit and the selection unit of the devices b1 to bn are normal.
【図3】装置b1の切替制御部および選択部が異常の場
合のシーケンスを示す図。FIG. 3 is a diagram showing a sequence when the switching control unit and the selection unit of the device b1 are abnormal.
【図4】従来例の構成を示す図。FIG. 4 is a diagram showing a configuration of a conventional example.
【図5】従来例のシーケンスを示す図。FIG. 5 is a diagram showing a sequence of a conventional example.
【図6】従来例の現用系の送受信部または伝送路に故障
が発生した後に、装置bで切替が行われなかった場合の
シーケンスを示す図。FIG. 6 is a diagram showing a sequence in the case where switching is not performed in the device b after a failure has occurred in the transmitting / receiving unit or the transmission line of the working system in the conventional example.
【図7】従来例の問題点を説明するための図。FIG. 7 is a diagram for explaining a problem of the conventional example.
【図8】一つの系の中に現用系と予備系とが混在してし
まう場合のシーケンスを示す図。FIG. 8 is a diagram showing a sequence in the case where an active system and a standby system coexist in one system.
10、20、40、50 切替制御部 111 、112 、211 、212 411 、412 、5
11 、512 送受信部 12、22、42、52 選択部 13、43 故障検出部 14 切替なし通知発生部 15 切替部検査信号発生部 16 切替制御応答受信部 17、44 切替要求発生部 18、26、46、54 切替命令発生部 23 切替制御要求受信部 24 検査部 25 切替部検査応答発生部 27、55 切替応答発生部 28、47、56 切替なし通知発生部 301 、302 、321 、322 伝送路 311 、312 分岐結合器 45 切替制御応答検出部 53 切替制御要求検出部10, 20, 40, 50 Switching control section 11 1 , 11 2 , 21 1 , 21 2 41 1 , 41 2 , 5
1 1 , 51 2 Transmission / reception unit 12, 22, 42, 52 Selection unit 13, 43 Failure detection unit 14 No switching notification generation unit 15 Switching unit inspection signal generation unit 16 Switching control response reception unit 17, 44 Switching request generation unit 18, 26, 46, 54 Switching command generating unit 23 Switching control request receiving unit 24 Inspection unit 25 Switching unit Inspection response generating unit 27, 55 Switching response generating unit 28, 47, 56 Notification not generating switching unit 30 1 , 30 2 , 32 1 , 32 2 Transmission line 31 1 , 31 2 Branch coupler 45 Switching control response detection unit 53 Switching control request detection unit
───────────────────────────────────────────────────── フロントページの続き (51)Int.Cl.6 識別記号 庁内整理番号 FI 技術表示箇所 H04L 12/24 12/26 12/28 29/14 9466−5K H04L 11/20 C 9371−5K 13/00 311 ─────────────────────────────────────────────────── ─── Continuation of the front page (51) Int.Cl. 6 Identification code Internal reference number FI Technical indication location H04L 12/24 12/26 12/28 29/14 9466-5K H04L 11/20 C 9371-5K 13 / 00 311
Claims (4)
れ備えた一つの主装置と複数の従装置とを備え、この主
装置には前記従装置の障害を検出する手段と、この検出
する手段が障害を検出したときに前記現用系を前記予備
系に切替える手段とを備えた現用予備切替方式におい
て、 障害が検出されたときに前記切替える手段の前記従装置
側のすべてについて正常性を検査する手段と、少なくと
も一つの前記従装置についてこの検査する手段の検査結
果が異常を示すときすべての前記従装置について切替え
を禁止する手段とを備えたことを特徴とする現用予備切
替方式。1. A main device and a plurality of slave devices, each of which has an active communication system and a standby communication system, respectively. The main device has means for detecting a failure of the slave device, and means for detecting the failure. When a failure is detected, in the working standby switching method, which comprises means for switching the working system to the protection system, the normality is checked for all of the slave devices of the switching means when a failure is detected. And a means for prohibiting switching of all of the slaves when the inspection result of at least one of the slaves indicates an abnormality in the inspection means of at least one of the slaves.
信系統の下り回線を介して前記従装置のそれぞれに対し
質問信号を送信する手段と、この質問信号に対して前記
各従装置からその通信系統の上り回線を介して応答信号
を送信する手段と、この応答信号を受信し分析する手段
とを含む請求項1記載の現用予備切替方式。2. The means for inspecting means for transmitting an inquiry signal from the main device to each of the slave devices via a downlink of a communication system, and the slave device for the inquiry signal. 2. The active standby switching system according to claim 1, further comprising: a means for transmitting a response signal via an upstream line of a communication system, and a means for receiving and analyzing the response signal.
替制御部に取り込まれ、応答信号はこの切替制御部から
上り回線に送信される請求項2記載の現用予備切替方
式。3. The active protection switching system according to claim 2, wherein the inquiry signal of the downlink is fetched by each switching control unit of the slave device, and the response signal is transmitted from the switching control unit to the uplink.
検査部にはその切替制御部に取り込まれた信号が検査信
号であるとき切替選択部の正常性を検査する手段を含む
請求項3記載の現用予備切替方式。4. The switching control unit includes an inspection unit, and the inspection unit includes means for inspecting the normality of the switching selection unit when the signal fetched by the switching control unit is an inspection signal. The active standby switching method described in 3.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP14481594A JP3284509B2 (en) | 1994-06-27 | 1994-06-27 | Working spare switching method |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP14481594A JP3284509B2 (en) | 1994-06-27 | 1994-06-27 | Working spare switching method |
Publications (2)
Publication Number | Publication Date |
---|---|
JPH0818594A true JPH0818594A (en) | 1996-01-19 |
JP3284509B2 JP3284509B2 (en) | 2002-05-20 |
Family
ID=15371112
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP14481594A Expired - Fee Related JP3284509B2 (en) | 1994-06-27 | 1994-06-27 | Working spare switching method |
Country Status (1)
Country | Link |
---|---|
JP (1) | JP3284509B2 (en) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO2001093489A1 (en) * | 2000-05-31 | 2001-12-06 | Mitsubishi Denki Kabushiki Kaisha | Redundant optical multiple-branch communication system |
-
1994
- 1994-06-27 JP JP14481594A patent/JP3284509B2/en not_active Expired - Fee Related
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO2001093489A1 (en) * | 2000-05-31 | 2001-12-06 | Mitsubishi Denki Kabushiki Kaisha | Redundant optical multiple-branch communication system |
Also Published As
Publication number | Publication date |
---|---|
JP3284509B2 (en) | 2002-05-20 |
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