JP2833543B2 - Line switching method for data communication - Google Patents
Line switching method for data communicationInfo
- Publication number
- JP2833543B2 JP2833543B2 JP7281310A JP28131095A JP2833543B2 JP 2833543 B2 JP2833543 B2 JP 2833543B2 JP 7281310 A JP7281310 A JP 7281310A JP 28131095 A JP28131095 A JP 28131095A JP 2833543 B2 JP2833543 B2 JP 2833543B2
- Authority
- JP
- Japan
- Prior art keywords
- signal
- line
- working
- data signal
- line switching
- 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 - Fee Related
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Landscapes
- Detection And Prevention Of Errors In Transmission (AREA)
- Maintenance And Management Of Digital Transmission (AREA)
- Monitoring And Testing Of Transmission In General (AREA)
Description
【0001】[0001]
【発明の属する技術分野】本発明は、データ回線障害を
救済するため現用回線と予備回線とを回線切替するデー
タ通信の回線切替方式に関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a data communication line switching system for switching between a working line and a protection line to remedy a data line failure.
【0002】[0002]
【従来の技術】従来のデータ信号の回線切替方式では、
伝送しているデータ信号の内容に関わらず回線切替を行
っていた。2. Description of the Related Art In a conventional data signal line switching system,
Line switching was performed regardless of the content of the data signal being transmitted.
【0003】従来のデータ信号の回線切替方式の一例と
して、特開平2−90773号公報に記載されている。An example of a conventional data signal line switching system is disclosed in Japanese Patent Application Laid-Open No. 2-90773.
【0004】上記公報において、図6のブロック図に示
してあるようにデータ通信の専用回線11が障害発生
時、発呼局側13から着呼局側14に電文を送信し、着
呼局側14が応答を返すと識別電文保持部15に登録し
てある識別用電文を、電文送信部16が送信する。着呼
局側14では、この識別用電文を電文受信部17で受信
後識別電文判断部18にて識別用電文の正当性を判断し
ている。その結果により、回線切替を実施している。In the above-mentioned publication, as shown in the block diagram of FIG. 6, when a failure occurs in the dedicated line 11 for data communication, a message is transmitted from the calling station 13 to the called station 14 and transmitted to the called station 14. When the 14 returns a response, the identification message registered in the identification message holding unit 15 is transmitted by the message transmission unit 16. In the called station 14, after receiving the identification message in the message receiving unit 17, the identification message determining unit 18 determines the validity of the identification message. According to the result, the line switching is performed.
【0005】以上のように、切替を実施する際は、切替
に関わる当該回線の確認さえとれれば切替を実施する方
式がとられていた。[0005] As described above, when switching is performed, a system is used in which switching is performed as long as the line involved in switching is confirmed.
【0006】[0006]
【発明が解決しようとする課題】前述した従来の構成
は、回線に障害が発生し送信しているデータに誤りが発
生した場合、送信しているデータの内容が電文の途中で
も回線切替を行ってしまう可能性があり、例えば、制御
信号や情報信号を送信中の場合でも切替が発生して正常
なデータを送信している予備回線のデータを受信しても
電文の途中で正常な予備回線のデータも最低1電文は無
駄になってしまう問題を有していた。In the above-mentioned conventional configuration, when a failure occurs in a line and an error occurs in transmitted data, the line is switched even if the content of the transmitted data is in the middle of a message. For example, even when a control signal or an information signal is being transmitted, switching may occur even if data of a protection line transmitting normal data is received. Also, there was a problem that at least one electronic message was wasted.
【0007】本発明は上記問題を解決するために、例え
ば子装置にて現用回線に誤りを検出し誤り数を計数して
回線切替を必要と判断した場合は即座に回線切替を行う
のではなく、親装置に対して回線切替の意志を知らせア
イドル状態を長くさせて、送信しているデータ信号の内
容を無駄にしないように制御信号や情報信号を送信中で
なくアイドル状態中に回線切替を行うことで、より無駄
のない、また信頼度の高い回路切替の構成を提供するこ
とを目的とする。In order to solve the above problem, the present invention does not perform line switching immediately when it is determined that line switching is necessary, for example, when an error is detected in the working line in the slave device and the number of errors is counted and it is determined that line switching is necessary. In this case, the parent device is informed of the intention of line switching and the idle state is lengthened, so that the contents of the data signal being transmitted are not wasted, and the line switching is performed during the idle state without transmitting the control signal or the information signal. By doing so, it is an object to provide a circuit switching configuration with less waste and high reliability.
【0008】[0008]
【課題を解決するための手段】本発明のデータ通信の回
線切替方式は、データ信号を送受信する対向した2装置
のそれぞれが、送信側で現用回線と予備回線で送信し、
受信側で前記現用回線と予備回線の受信データの誤りを
検出して正常な回線側へ切替えるデータ通信の回線切替
方式において、前記2装置の一方の装置で所定の数以上
の前記誤りを検出し、回線切替が必要と判断した場合
は、当該装置は他方の装置へ回線切替要求を送出し、受
信データ受信後所定の時間Mより長くアイドル状態が継
続していることを確認後回線切替する手段と、前記他方
の装置は正常時には送信データ間のアイドル状態を所定
の時間Nとし、前記一方の装置の回線切替要求を受けて
さらに前記送信データ間のアイドル状態の時間を前記所
定の時間Nより長くする手段を有している。According to the line switching method of the data communication of the present invention, two opposing devices for transmitting and receiving a data signal each transmit on a transmitting line through a working line and a protection line,
In a line switching method of data communication in which a receiving side detects an error in the received data of the working line and the protection line and switches to a normal line side, one of the two devices detects the predetermined number or more of the errors. If it is determined that line switching is necessary, the device sends a line switching request to the other device, and after confirming that the idle state has continued for a predetermined time M after receiving the received data, means for switching the line. And the other device sets the idle state between transmission data to a predetermined time N during normal operation, and further receives the line switching request of the one device and further sets the idle state time between the transmission data to the predetermined time N. There is a means to lengthen.
【0009】本発明によれば、回線に障害が発生し受信
データ信号に誤りが発生した場合、回線切替要求を送信
側に伝え、アイドル状態を一定時間継続させ、あらかじ
め決められた時間アイドル状態が続いたことを確認後ア
イドル状態中に回線切替を行うので、すなわち制御信号
や情報信号等を送信中に回線切替することがなくなるの
で回線切替を実施してもデータの無駄を最低限に押さ
え、しかもヒットレスで回線切替ができる。According to the present invention, when a fault occurs in a line and an error occurs in a received data signal, a line switching request is transmitted to the transmitting side, the idle state is continued for a fixed time, and the idle state is set for a predetermined time. Since line switching is performed during the idle state after confirming that the line switching is performed, that is, line switching is not performed during transmission of a control signal or an information signal, etc. Moreover, line switching can be performed without hits.
【0010】[0010]
【発明の実施の形態】以下本発明について、図面を参照
して説明する。図1は、本発明の一実施例に係る回線切
替方式構成を示すブロック図である。DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below with reference to the drawings. FIG. 1 is a block diagram showing a configuration of a line switching system according to one embodiment of the present invention.
【0011】本図において、上り回線と下り回線の双方
向となっており、この上り回線と下り回線の構成は共に
同一である。ここで、1と2は共に同一の構成をした通
信装置であり、装置1からの制御又は情報信号に対して
装置2が応答信号を返すというデータ信号のやりとりが
行われる。[0011] In the figure, there is a bidirectional connection between the uplink and the downlink, and the configurations of the uplink and the downlink are the same. Here, the communication devices 1 and 2 have the same configuration, and exchange data signals such that the device 2 returns a response signal to control or information signals from the device 1.
【0012】まず、装置1の情報処理部101からは制
御信号や情報信号等(以下制御信号等と称す)が送信デ
ータ信号S1として出力される。送信データ信号S1に
は、連続して異なる内容の制御信号等が出力されるので
はなく、1つの制御信号が出力された後は一定時間Nだ
けデータが何も出力されないアイドル状態となる。First, a control signal, an information signal, and the like (hereinafter, referred to as a control signal) are output from the information processing section 101 of the device 1 as a transmission data signal S1. The transmission data signal S1 is not an output of a control signal or the like having different contents continuously, but is in an idle state in which no data is output for a predetermined time N after one control signal is output.
【0013】誤り検出信号付与部102では、送信デー
タ信号S1を入力し誤り検出のために計数し計数した値
を送信データ信号に付与してデータ信号S2として出力
する。The error detection signal adding section 102 receives the transmission data signal S1, counts the error for error detection, adds the counted value to the transmission data signal, and outputs it as a data signal S2.
【0014】現用送信部103では、データ信号S2を
入力し下り現用回線S5にて出力する。The working transmitter 103 receives the data signal S2 and outputs it on the downstream working line S5.
【0015】予備送信部113ではデータ信号S2を入
力し下り予備回線S4にて送出する。[0015] The spare transmission section 113 receives the data signal S2 and sends it out on the downlink spare line S4.
【0016】装置2の現用受信部221では、下り現用
回線S5にてデータ信号S2を受信し現用受信信号S2
1を送出する。The working receiver 221 of the device 2 receives the data signal S2 on the downlink working line S5 and receives the working reception signal S2.
Send 1
【0017】現用誤り検出部222では、現用受信信号
S21を入力し誤り検出を行い、誤り数を計数しあらか
じめ設定された閾値を計数した誤り数が越えた場合は、
現用回線に誤りがあることを知らせる現用誤り有無信号
S23と、さらに、現用データ信号S27とを出力す
る。The working error detection section 222 receives the working reception signal S21, performs error detection, counts the number of errors, and if the number of errors exceeds a preset threshold, exceeds the number of errors.
It outputs a working error presence / absence signal S23 for notifying that there is an error in the working line and further a working data signal S27.
【0018】装置2の下りの予備回線も現用回線と同様
に、予備受信部231では、下り予備回線S4の信号を
受信し予備受信信号S22を出力する。As with the working line, the protection line 231 of the device 2 receives the signal of the downlink protection line S4 and outputs a protection reception signal S22 in the same manner as the working line.
【0019】予備誤り検出部232では、現用誤り検出
部222と同様の機能を有し予備受信信号S22を入力
し誤り検出を行い予備データ信号S26と誤り検出計数
結果として予備誤り有無信号S24を出力する。The spare error detector 232 has the same function as the working error detector 222, receives the spare received signal S22, detects an error, and outputs a spare data signal S26 and a spare error presence / absence signal S24 as an error detection count result. I do.
【0020】切替部223では、現用データ信号S27
と予備データ信号S26と切替制御信号S27とを入力
し、切替制御信号S25に基づいて回線切替を行い受信
データ信号S28を出力する。In the switching section 223, the working data signal S27
, A spare data signal S26 and a switching control signal S27, and performs line switching based on the switching control signal S25 to output a reception data signal S28.
【0021】装置2の情報処理部201では、受信デー
タ信号S28を入力し各種処理を行う。情報処理部20
1から出力される送信データ信号S29の内容として
は、装置1の情報処理部101からの制御内容に対する
応答の他、特に、現用誤り有無信号S23と予備誤り有
無信号S24とを入力し、回線の誤りの有無を監視し
て、監視の結果、例えば、下り現用回線に誤りが発生し
下り予備回線は誤りがない場合は、回線切替要求信号を
送信データ信号S29として出力する。またさらに、回
線切替要求を行った場合は、前記誤りのあった受信デー
タ信号S28を受信してからあらかじめ決められた時間
M(Mは後述するLより短い時間)だけ連続してアイド
ル状態が続いていることを確認したら切替制御信号S2
5を出力する。The information processing unit 201 of the device 2 receives the received data signal S28 and performs various processes. Information processing unit 20
As the contents of the transmission data signal S29 output from the communication device 1, in addition to the response to the control contents from the information processing unit 101 of the device 1, in particular, the working error existence signal S23 and the spare error existence signal S24 are inputted, The presence or absence of an error is monitored, and as a result of the monitoring, for example, if an error occurs in the downlink working line and the downlink protection line has no error, a line switching request signal is output as the transmission data signal S29. Further, when a line switching request is made, the idle state continues for a predetermined time M (M is a time shorter than L, which will be described later) after receiving the erroneous reception data signal S28. Switch control signal S2
5 is output.
【0022】誤り検出信号付与部202では、送信デー
タ信号S29を入力し誤り検出のために計数し計数した
値を送信データ信号S29に付与してデータ信号S30
として出力する。The error detection signal adding section 202 receives the transmission data signal S29, counts it for error detection, and adds the counted value to the transmission data signal S29 to add the data signal S30.
Output as
【0023】現用送信部203では、データ信号S30
を入力し上り現用回線S31にて送出する。In the active transmission unit 203, the data signal S30
And sends it out on the upstream working line S31.
【0024】予備送信部213では、データ信号S30
を入力し上り予備回線S32にて送出する。In the preliminary transmission section 213, the data signal S30
And sends it out on the upstream protection line S32.
【0025】装置1の上り回線側の回路構成としては、
装置2の下り回線側と同一構成である。The circuit configuration on the upstream side of the device 1 is as follows.
It has the same configuration as the downstream side of the device 2.
【0026】装置1の情報処理部101では、入力した
受信データ信号S35を各種処理し、特に、その内容が
回線切替要求であった場合は、あらかじめ決められた時
間L(LはNより長い時間)だけ連続してアイドル状態
にする。その後、次に送出予定の情報信号を送出する。
装置1の情報処理部101でも、装置2の情報処理部2
01と同様に現用誤り有無信号S34及び予備誤り有無
信号S33を入力し、回線の誤りの有無を監視して、監
視の結果、例えば、上り現用回線に誤りが発生し上り予
備回線は誤りがない場合は、次に送出すべき送信データ
信号S1を出力するまでのアイドル状態の時間を延長し
切替制御信号S36を出力する。The information processing unit 101 of the apparatus 1 performs various processes on the input received data signal S35. In particular, when the content is a line switching request, a predetermined time L (L is longer than N) ) Only idle continuously. Thereafter, the information signal to be transmitted next is transmitted.
The information processing unit 101 of the device 1
As in the case of 01, the working error presence / absence signal S34 and the protection error presence / absence signal S33 are input, and the presence or absence of a line error is monitored. In this case, the idle control time until the next transmission data signal S1 to be transmitted is output is extended, and the switching control signal S36 is output.
【0027】従って、下り回線では、回線切替要求を出
力後アイドル状態があらかじめ決められた時間Mが連続
した時(アイドル状態)に回線切替を行い、また、上り
回線でもアイドル状態中に回線切替を行い、制御信号等
の電文を送信中に回線切替を行わないので電文を無駄に
することなく、回線品質を保ちながら、ヒットレスで回
線切替を行うことができる。Therefore, in the downlink, after the line switching request is output, the line is switched when the idle state continues for a predetermined time M (idle state), and the line is switched during the idle state in the uplink. Since line switching is not performed during transmission of a message such as a control signal, line switching can be performed without hitting while maintaining the line quality without wasting the message.
【0028】図2は、装置1と装置2間における送受信
信号の送受シーケンスの一例である。FIG. 2 is an example of a transmission / reception sequence of a transmission / reception signal between the device 1 and the device 2.
【0029】装置1は制御信号等1を出力する。装置2
は制御信号等1を受信後、応答信号1を出力する。The device 1 outputs a control signal 1 and the like. Device 2
Outputs the response signal 1 after receiving the control signal 1 and the like.
【0030】装置1は応答信号1を受信後、一定時間ア
イドル状態となる。After receiving the response signal 1, the device 1 enters an idle state for a certain period of time.
【0031】装置1はアイドル状態を一定時間継続後、
制御信号等2を出力する。After the device 1 has been idle for a certain period of time,
It outputs a control signal 2 and the like.
【0032】装置2は制御信号等2を受信後、応答信号
2を出力する。The device 2 outputs a response signal 2 after receiving the control signal 2 and the like.
【0033】すなわち、装置1から装置2へは制御信号
等が継続して送信されることはなく、制御信号等と次の
制御信号等との間にはアイドル状態が存在する。That is, a control signal or the like is not continuously transmitted from the device 1 to the device 2, and an idle state exists between the control signal and the next control signal.
【0034】以上の説明では、下り現用回線に障害が発
生した場合について述べたが、上り回線でも同じ動作を
する。In the above description, the case where a failure has occurred in the downstream working line has been described, but the same operation is performed in the upstream line.
【0035】図3は、装置1と装置2間での送受信デー
タフォーマットの一例である。FIG. 3 shows an example of the format of data transmitted and received between the device 1 and the device 2.
【0036】制御信号等/応答信号は、開始フラグと終
了フラグとの間にアドレス、データと誤り検出用符号が
入っている。そして、各制御信号等/応答信号間は時間
Nだけアイドル状態となっている。The control signal / response signal includes an address, data and an error detection code between a start flag and an end flag. The control signal and the response signal are idle for a time N.
【0037】図4は、装置1と装置2間における送受信
信号の送受シーケンスの一例で現用回線に障害が発生し
た場合である。FIG. 4 shows an example of a transmission / reception sequence of a transmission / reception signal between the device 1 and the device 2 when a failure occurs in the working line.
【0038】装置1から出力された現用回線の制御信号
等1に誤りが検出された場合、装置2からは回線切替を
要求する内容の応答信号1を出力する。When an error is detected in the control signal 1 of the working line output from the device 1, a response signal 1 requesting line switching is output from the device 2.
【0039】装置1は、装置2からの応答信号1の内容
を見て回線切替の要求であるので通常のアイドル状態を
あらかじめ決められた時間継続する。The device 1 sees the contents of the response signal 1 from the device 2 and, because of the request for line switching, continues the normal idle state for a predetermined time.
【0040】装置2では、アイドル状態の時間を計数
し、あらかじめ決められた時間アイドル状態が継続して
いることを確認後、回線切替指示を切替制御信号S2
5,S36に出力する。The device 2 counts the idle state time, confirms that the idle state has continued for a predetermined time, and issues a line switching instruction to the switching control signal S2.
5, output to S36.
【0041】装置1は、あらかじめ決められた時間アイ
ドル状態を継続した後、制御信号等2を出力する。装置
2は、予備回線で受信した制御信号等2を使用する。The device 1 outputs a control signal or the like 2 after continuing the idle state for a predetermined time. The device 2 uses a control signal or the like 2 received on the protection line.
【0042】図5は、装置1と装置2間における送受信
信号の現用回線に障害が発生した場合の回線切替が実施
されるタイミングチャートの一例である。FIG. 5 is an example of a timing chart for performing line switching when a failure occurs on a working line for transmitting and receiving signals between the device 1 and the device 2.
【0043】下り現用回線の制御信号等1に誤りが検出
された場合、上り現用回線を利用して回線切替要求を応
答1で送信する。When an error is detected in the control signal or the like 1 of the downstream working line, a line switching request is transmitted in response 1 using the upstream working line.
【0044】装置1から出力される下り回線は、回線切
替の要求を受信したのであらかじめ決められた時間連続
してアイドル状態となる。The downlink output from the apparatus 1 is in an idle state continuously for a predetermined time since the downlink request is received.
【0045】装置2では、下り回線があらかじめ設定さ
れた時間連続してアイドル状態が続いていることを確認
後、切替制御信号で回線切替の指示を出力して、現用回
線から予備回線に切替る。The device 2 confirms that the idle state of the downlink has continued for a preset time and outputs a line switching instruction with a switching control signal to switch from the working line to the protection line. .
【0046】[0046]
【発明の効果】以上説明したように、本発明によれば、
下り回線の場合選択している回線に誤りが発生し回線切
替を行う際に送端局に対して回線切替の必要性を伝えア
イドル状態の時間を長くし、長くしたアイドル状態中に
回線切替を実施することにより、また、上り回線の場合
アイドル状態の時間を延長しアイドル状態中に回線切替
を行うので、つまり、有効な制御信号や譲歩信号または
応答信号等の送受信中に回線切替を実施することがなく
なるので、送受信信号の無駄を最小限しヒットレスで回
線切替を行うことができるという効果を有する。As described above, according to the present invention,
In the case of a downlink, an error occurs in the selected line, and when performing line switching, the necessity of line switching is communicated to the sending end station, and the idle state time is extended, and line switching is performed during the extended idle state. By carrying out, in the case of the uplink, the idle switching time is extended and the line switching is performed during the idle state, that is, the line switching is performed during transmission / reception of a valid control signal, concession signal, response signal, or the like. Therefore, there is an effect that line switching can be performed in a hitless manner by minimizing waste of transmission / reception signals.
【図1】本発明の一実施例に係るデータ通信の回線切替
方式の構成ブロック図である。FIG. 1 is a configuration block diagram of a line switching system for data communication according to an embodiment of the present invention.
【図2】本発明の一実施例に係るデータ通信の回線切替
方式のシーケンス図である。FIG. 2 is a sequence diagram of a line switching method for data communication according to an embodiment of the present invention.
【図3】本発明の一実施例に係るデータ通信の回線切替
方式のデータフォーマット図である。FIG. 3 is a data format diagram of a line switching system for data communication according to an embodiment of the present invention.
【図4】本発明の一実施例に係るデータ通信の回線切替
方式のシーケンス図である。FIG. 4 is a sequence diagram of a line switching method for data communication according to an embodiment of the present invention.
【図5】本発明の一実施例に係るデータ通信の回線切替
方式のタイミング図である。FIG. 5 is a timing chart of a line switching method for data communication according to an embodiment of the present invention.
【図6】従来のデータ通信の回線切替方式を示すブロッ
ク図である。FIG. 6 is a block diagram showing a conventional data communication line switching method.
1 装置 2 装置 11 専用回線 12 予備回線 13 発呼局側 14 着呼局側 15 識別電文保持部 16 電文送信部 17 電文受信部 18 電文判断部 19 回線切替部 101 情報処理部 102 誤り検出信号付与部 103 現用送信部 104 予備送信部 121 現用受信部 122 現用誤り検出部 124 切替部 131 予備受信部 132 予備誤り検出部 221 現用受信部 222 現用誤り検出部 223 切替部 231 予備受信部 232 予備誤り検出部 201 情報処理部 202 誤り検出信号付与部 203 現用送信部 204 予備送信部 Reference Signs List 1 device 2 device 11 dedicated line 12 protection line 13 calling station side 14 called station side 15 identification message holding unit 16 message transmission unit 17 message reception unit 18 message judgment unit 19 line switching unit 101 information processing unit 102 error detection signal addition Unit 103 Working transmitting unit 104 Reserve transmitting unit 121 Working receiving unit 122 Working error detecting unit 124 Switching unit 131 Reserve receiving unit 132 Reserve error detecting unit 221 Working receiving unit 222 Working error detecting unit 223 Switching unit 231 Reserve receiving unit 232 Reserve error detecting Unit 201 information processing unit 202 error detection signal assigning unit 203 working transmission unit 204 preliminary transmission unit
───────────────────────────────────────────────────── フロントページの続き (58)調査した分野(Int.Cl.6,DB名) H04B 1/74 H04B 17/00 H04L 1/22 H04L 29/14──────────────────────────────────────────────────続 き Continued on the front page (58) Field surveyed (Int.Cl. 6 , DB name) H04B 1/74 H04B 17/00 H04L 1/22 H04L 29/14
Claims (4)
のそれぞれが、送信側で現用回線と予備回線で送信し、
受信側で前記現用回線と前記予備回線の受信データの誤
りを検出して正常な回線側へ切替えるデータ通信の回線
切替方式において、 前記2装置の一方の装置で所定の数以上の前記誤りを検
出し、回線切替が必要と判断した場合に、当該装置は他
方の装置へ回線切替要求を送出し、受信データ受信後所
定の時間Mよりも長くアイドル状態が継続していること
を確認後回線切替する手段と、 前記他方の装置は、正常時には送信データ間のアイドル
状態を所定の時間Nとし、前記一方の装置の回線切替要
求を受けてさらに前記送信データ間のアイドル状態の時
間を前記所定の時間Nより長くする手段とを有すること
を特徴とするデータ通信の回線切替方式。An apparatus for transmitting and receiving a data signal transmits and receives data on a working line and a protection line on a transmitting side, respectively.
In a line switching method of data communication in which a receiving side detects an error in received data of the working line and the protection line and switches to a normal line side, one of the two devices detects the error of a predetermined number or more. However, if it is determined that line switching is necessary, the device sends a line switching request to the other device, and after confirming that the idle state has continued for a predetermined time M after receiving the received data, the line switching is performed. The other device, when normal, the idle state between the transmission data is a predetermined time N, in response to a line switching request of the one device, further idle time between the transmission data is the predetermined time N Circuit switching system for data communication, comprising means for making the time longer than the time N.
りも長いことを特徴とする請求項1記載のデータ通信の
回線切替方式。2. The line switching method for data communication according to claim 1, wherein said predetermined time M is longer than said predetermined time N.
は、前記一方の装置の回線切替要求を受けて送信データ
間のアイドル状態を所定の時間Mより長い時間Lとし、
さらに回線切替が必要な場合には回線切替に必要な時間
だけ増加することを特徴とする請求項1記載のデータ通
信の回線切替方式。3. The means for making the length of time longer than the predetermined time N, wherein the idle state between transmission data is set to a time L longer than a predetermined time M in response to a line switching request of the one device,
2. The data communication line switching method according to claim 1, wherein when the line switching is necessary, the time is increased by a time required for the line switching.
置と第2の装置の間で現用回線と予備回線とを回線切替
するデータ通信の回線切替方式において、 前記第1の装置及び前記第2の装置の送端側は送信デー
タ信号を計数し、その計数値を前記送信データ信号に付
与してデータ信号を出力する誤り検出符号付与部と、前
記データ信号を入力し現用回線として出力する現用送信
部と、前記データ信号を入力し予備回線として出力する
予備送信部と、 前記第1の装置及び前記第2の装置の受信側は、前記現
用回線を受信し現用受信信号を出力する現用受信部と、
前記現用受信信号を入力し誤り検出を行い受信データ信
号の誤り件数を計数し、誤り件数が所定の第1の閾値を
越えた場合は、現用誤り有無信号と受信データ信号とを
出力する現用誤り検出部と、前記予備回線を受信し予備
受信信号を出力する予備受信部と、前記予備受信信号を
入力し誤り検出を行い受信データ信号の誤り件数を計数
し、誤り件数が所定の第2の閾値を越えた場合は、予備
誤り有無信号と予備受信データ信号とを出力する予備誤
り検出部と、前記現用データ信号と前記予備データ信号
と切替制御信号とを入力し切替制御信号に基づき回線を
切替えて現用データ信号または予備データ信号の内どち
らか一方を受信データ信号として出力する切替部とを有
し、 前記第1の装置と前記第2の装置は、前記入力した現用
誤り有無信号と前記予備誤り有無信号とに基づき、回線
切替が必要と判断された場合は回線切替の要求を前記送
信データ信号として出力し、回線切替要求をした場合
は、前記誤りがあった受信データ信号を入力後所定の時
間Mアイドル状態が連続していることを確認してから切
替制御信号を出力し、 送信データ信号を出力後所定の時間Nだけアイドル状態
にし次の送信データ信号を出力し、前記回線切替要求に
基づき前記Mより長い所定の時間Lだけ連続してアイド
ル状態にし、さらに、前記入力した現用誤り有無信号と
前記予備誤り有無信号とに基づき、回線切替が必要と判
断された場合はアイドル状態の時間を回線切替に係る時
間分延長した回線切替制御信号を出力するよう制御する
情報処理部を有することを特徴とするデータ通信の回線
切替方式。4. A data communication line switching system for switching between a working line and a protection line between a first device and a second device to remedy a data line failure, wherein the first device and the second device The transmitting end of the second device counts the transmission data signal, adds the count value to the transmission data signal and outputs a data signal, and receives the data signal and outputs the data signal as a working line. A working transmission unit, a protection transmission unit that inputs the data signal and outputs the protection signal as a protection line, and a reception side of the first device and the second device that receives the working line and outputs a working reception signal A receiving unit,
The working reception signal is inputted, error detection is performed, the number of errors in the reception data signal is counted, and if the number of errors exceeds a predetermined first threshold, a working error signal for outputting a working error presence / absence signal and a reception data signal is output. A detection unit, a standby reception unit that receives the standby line and outputs a standby reception signal, and inputs the standby reception signal, performs error detection, counts the number of errors in the received data signal, and sets the number of errors to a predetermined second number. When the threshold value is exceeded, a spare error detection unit that outputs a spare error presence / absence signal and a spare received data signal, and inputs the working data signal, the spare data signal, and the switching control signal, and switches the line based on the switching control signal. A switching unit that switches and outputs one of a working data signal and a protection data signal as a reception data signal, wherein the first device and the second device are configured to receive the input working error signal. And, based on the preliminary error presence / absence signal, when it is determined that line switching is necessary, a line switching request is output as the transmission data signal, and when a line switching request is made, the reception data signal having the error is output. After confirming that the idle state has continued for a predetermined time after the input, the switching control signal is output. After outputting the transmission data signal, the transmission data signal is set to the idle state for a predetermined time N and the next transmission data signal is output. When it is determined that line switching is necessary based on the input working error presence / absence signal and the spare error presence / absence signal based on the input working error presence / absence signal and the spare error presence / absence signal, A line switching method for data communication, comprising: an information processing unit for controlling to output a line switching control signal in which an idle state time is extended by a time relating to line switching.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP7281310A JP2833543B2 (en) | 1995-10-30 | 1995-10-30 | Line switching method for data communication |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP7281310A JP2833543B2 (en) | 1995-10-30 | 1995-10-30 | Line switching method for data communication |
Publications (2)
Publication Number | Publication Date |
---|---|
JPH09130304A JPH09130304A (en) | 1997-05-16 |
JP2833543B2 true JP2833543B2 (en) | 1998-12-09 |
Family
ID=17637313
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP7281310A Expired - Fee Related JP2833543B2 (en) | 1995-10-30 | 1995-10-30 | Line switching method for data communication |
Country Status (1)
Country | Link |
---|---|
JP (1) | JP2833543B2 (en) |
-
1995
- 1995-10-30 JP JP7281310A patent/JP2833543B2/en not_active Expired - Fee Related
Also Published As
Publication number | Publication date |
---|---|
JPH09130304A (en) | 1997-05-16 |
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