JPH0644754B2 - Time synchronization monitoring method - Google Patents
Time synchronization monitoring methodInfo
- Publication number
- JPH0644754B2 JPH0644754B2 JP26046786A JP26046786A JPH0644754B2 JP H0644754 B2 JPH0644754 B2 JP H0644754B2 JP 26046786 A JP26046786 A JP 26046786A JP 26046786 A JP26046786 A JP 26046786A JP H0644754 B2 JPH0644754 B2 JP H0644754B2
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- Japan
- Prior art keywords
- station
- flag
- line
- time synchronization
- maintained
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Lifetime
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- Emergency Protection Circuit Devices (AREA)
- Small-Scale Networks (AREA)
- Monitoring And Testing Of Transmission In General (AREA)
- Synchronisation In Digital Transmission Systems (AREA)
Description
【発明の詳細な説明】 〔産業上の利用分野〕 本発明は、時刻同期方式を採用している装置に利用され
る時刻同期監視方法に関する。特に、回線障害時の同期
系の監視に関するものである。TECHNICAL FIELD The present invention relates to a time synchronization monitoring method used in a device adopting a time synchronization method. In particular, it relates to the monitoring of the synchronous system at the time of line failure.
本発明は、時刻同期方式を採用している装置の時刻同期
監視方法において、 時刻同期制御に利用される局間の回線障害に基づく同期
系の維持不能状態を時刻同期制御に利用されている回線
を使用して監視することにより、 時刻同期制御に利用されない他の回線が不必要でその回
線の障害に影響されずに確実に同期系の監視ができるよ
うにしたものである。The present invention relates to a time synchronization monitoring method for a device adopting a time synchronization system, wherein a line used for time synchronization control is an unmaintainable state of a synchronization system based on a line failure between stations used for time synchronization control. By using this to monitor other lines that are not used for time synchronization control, it is possible to reliably monitor the synchronous system without being affected by the line failure.
第３図は２局間の時刻同期方式を示すタイムチャートで
ある。第４図は４端子構成の装置の時刻同期方式を示す
図である。第５図は従来例の時刻同期監視方法を示す図
である。FIG. 3 is a time chart showing a time synchronization system between two stations. FIG. 4 is a diagram showing a time synchronization method of a device having a four-terminal configuration. FIG. 5 is a diagram showing a conventional time synchronization monitoring method.
従来の時刻同期方式は、２個所に回線障害に対して第５
図に示すように、同期系が維持できなくなったことを監
視している。第３図、第４図および第５図を参照して説
明する。The conventional time synchronization method has five points for line failure in two places.
As shown in the figure, the fact that the synchronous system cannot be maintained is monitored. Description will be made with reference to FIGS. 3, 4, and 5.
２局間における時刻同期方式は、第３図に示すように、
上位局にて自局のフレームの送信タイミングｅと下位局
Ｙからのフレームの受信タイミングｆとの時間差ＴＭを
計測し、この計測値を下位局Ｙへ送信する。下位局では
自局のフレームの送信タイミングｇと上位局からのフレ
ームの受信タイミングｈとの時間差ＴＳを計測し、この
時間差ＴＳと上位局Ｘから受信した時間差ＴＭとを比較
し、差が小さくなるように自局のフレームの送信タイミ
ングｇを制御する。以上の制御フレームを一定周期で送
信することにより繰り返し実行され、時間差ＴＭと時間
差ＴＳとが等しくなる状態、すなわち、２局間のフレー
ム送信時刻同期がとれた状態で安定する。The time synchronization method between the two stations is, as shown in FIG.
The upper station measures the time difference TM between the transmission timing e of the frame of its own station and the reception timing f of the frame from the lower station Y, and transmits this measured value to the lower station Y. The lower station measures the time difference TS between the frame transmission timing g of its own station and the frame reception timing h of the higher station, compares this time difference TS with the time difference TM received from the higher station X, and the difference becomes smaller. Thus, the transmission timing g of the frame of its own station is controlled. The control frame is repeatedly executed by transmitting the control frame at a constant cycle, and is stabilized in a state where the time difference TM and the time difference TS are equal to each other, that is, in a state where the frame transmission time between two stations is synchronized.
第４図に示すような局Ａ、Ｂ、Ｃ、Ｄからなる４端子構
成の場合には、従属同期系を構成し常時居Ａに局Ｂ、局
Ｂに局Ｃ、局Ｃに局Ｄおよび局Ｄに局Ａが追従するとも
に、各装置で上位局への送信タイミングｇと下位局への
送信タイミングｅを一致させることにより、４端子のフ
レーム送信時刻は一致する。In the case of a four-terminal configuration including stations A, B, C, and D as shown in FIG. 4, a subordinate synchronous system is configured so that station A is station A in station A, station C in station B, station D in station C, and so on. The station A follows the station D, and the transmission timing g to the upper station and the transmission timing e to the lower station are matched in each device, so that the frame transmission times of the four terminals are matched.
第５図に示すように、局Ａと局Ｂとの間の回線の障害
（障害部ｃ）および局Ｃと局Ｄとの間の回線の障害（障
害部ｄ）が同時に発生した場合は、局Ｂでは局Ａからの
フレームが受信できないために局Ａに追従不能となり、
局Ａと局Ｂとの間で同期系が切断され、局Ｄでは局Ｃか
らのフレームが受信できないために局Ｃに追従不能とな
り局Ｃと局Ｄとの間で同期系が切断されることになり、
同期系が維持ができなくなる。この場合に、上位局に追
従不能となった局Ｂおよび局Ｄでは、その旨を他局に通
知する。このとき局Ｂでは、局Ｄよりの通知を受信する
ことにより、また、局Ｄでは局Ｂよりの通知の受信する
ことにより同期系が維持されていないことを監視してい
る。As shown in FIG. 5, when the line failure between the stations A and B (failure part c) and the line failure between the stations C and D (failure part d) occur at the same time, Since station B cannot receive the frame from station A, it cannot follow station A,
The synchronization system is cut off between the stations A and B, and the station D cannot receive the frame from the station C and cannot follow the station C, and the synchronization system is cut off between the stations C and D. become,
The synchronous system cannot be maintained. In this case, the stations B and D, which cannot follow the upper station, notify the other stations to that effect. At this time, the station B monitors the fact that the synchronous system is not maintained by receiving the notification from the station D and by receiving the notification from the station B at the station D.
しかし、このような従来例の時刻同期監視方法では、時
刻同期制御に利用されていない回線すなわち第５図に示
す局Ｂと局Ｄとの間および局Ａと局Ｃとの間の回線が必
要であり、この回線の異常時には監視できない欠点があ
った。However, such a conventional time synchronization monitoring method requires a line that is not used for time synchronization control, that is, a line between the stations B and D and a line between the stations A and C shown in FIG. However, there was a drawback that this line could not be monitored when something went wrong.
本発明は上記の欠点を解決するもので、時刻同期制御に
利用されていない他の回線が不必要で、その回線の障害
に影響されない時刻同期監視方法を提供することを目的
とする。The present invention solves the above-mentioned drawbacks, and an object of the present invention is to provide a time synchronization monitoring method that does not require another line that is not used for time synchronization control and is not affected by the failure of the line.
第一の発明は、複数の局間の時刻同期監視方法の発明で
あり、全二重回線を介して接続され、この全二重回線を
使用して時刻同期制御を行う複数の局間の回線障害に対
して同期系が維持されていないことを検出する時刻同期
監視方法において、局間の回線障害が発生し、同期系が
維持されないことを時刻同期制御を行うことで検出した
障害回線の一方の局は第１フラグをこの障害回線に送信
し、この第１フラグを受信したこの障害回線の地方の局
は同期系が維持されていないことを検出することを特徴
とする。A first invention is an invention of a time synchronization monitoring method between a plurality of stations, which is a line between a plurality of stations connected via a full-duplex line and performing time synchronization control using the full-duplex line. In the time synchronization monitoring method that detects that the synchronization system is not maintained due to a failure, one of the failed lines detected by performing time synchronization control that a line failure between stations has occurred and the synchronization system is not maintained Station transmits the first flag to the faulty line, and the local station of the faulty line which receives the first flag detects that the synchronous system is not maintained.
第二の発明は、３局間以上の時刻同期監視方法の発明で
あり、全二重回線を介してループ状に接続され、この全
二重回線を使用して従属同期系を構成し時刻同期制御を
行う３個以上の局間の回線障害に対して同期系が維持さ
れていないことを検出する時刻同期監視方法において、
局間の回線障害が発生し、同期系が維持されていないこ
とを時刻同期制御を行うことで検出した障害回線の一方
の局は第１フラグをこの障害回線に送信し、この第１フ
ラグを受信したこの障害回線の地方の局は同期系が維持
されていないことを検出し、この障害回線の上位局は第
２フラグをその上位局に上記全二重回線を介して送信
し、上記障害回線の下位局は第３フラグをその下位局に
上記全二重回線を介して送信し、第２フラグおよび第３
フラグを同時に送信する場合、第２フラグを送信中に第
３フラグを受信する場合、または第３フラグを送信中に
第２フラグを受信する場合にはその局は同期系が維持さ
れていないことを検出することを特徴とする。A second invention is an invention of a time synchronization monitoring method for three or more stations, which is connected in a loop through a full-duplex line, and a subordinate synchronous system is configured using this full-duplex line to perform time synchronization. In a time synchronization monitoring method for detecting that a synchronous system is not maintained for a line failure between three or more stations that perform control,
One station of the faulty line that has detected that the line fault between the stations has occurred and the synchronous system is not maintained by performing the time synchronization control transmits the first flag to this faulty line, and the first flag is transmitted. The local station of the faulty line that has received detects that the synchronous system is not maintained, and the upper station of this faulty line transmits a second flag to the higher station of the faulty line via the full-duplex line. The lower station of the line sends the third flag to the lower station via the full-duplex line, and the second flag and the third flag are transmitted.
If the flag is transmitted at the same time, if the third flag is received during the transmission of the second flag, or if the second flag is received during the transmission of the third flag, the station is not in a synchronous system. Is detected.
第一の発明は、局間の回線障害が発生し、同期系が維持
されないことを時刻同期制御を行うことで検出した障害
回線の一方の局は第１フラグをこの障害回線に送信し、
この第１フラグを受信したこの障害回線の他方の局は同
期系が維持されていないことを検出することにより、時
刻同期制御に利用されない他の回線が不必要で、その回
線の障害に影響されずに確実に同期系の監視を行うこと
ができる。According to a first aspect of the invention, one station of a faulty line detected by performing time synchronization control that a line fault has occurred between stations and the synchronous system is not maintained, transmits a first flag to this faulty line,
By detecting that the synchronous system is not maintained, the other station of the faulty line that has received the first flag detects that the other line not used for time synchronization control is unnecessary and is affected by the fault of the line. Without fail, the synchronous system can be reliably monitored.
第二の発明は、第一の発明に加えて障害回線の上位局で
は第２フラグをその上位局に送信し、障害線の下位局で
は第３フラグをその下位局に送信し、第２フラグおよび
第３フラグを同時に送信する場合、第２フラグを送信中
に第３フラグを受信する場合または第３フラグ送信中に
第２フラグを受信する場合にはその局は同期系が維持さ
れていないことを検出することにより、時刻同期制御に
利用されない局間の回線のうちの２組以上の局間の回線
の障害に基づく同期系の維持不能状態でも、同期制御に
利用されない他の回線が不要でその回線の障害に影響さ
れずに確実に同期系の監視を行うことができる。The second invention is, in addition to the first invention, that the upper station of the faulty line transmits the second flag to the upper station, and the lower station of the faulty line transmits the third flag to the lower station and the second flag. And the third flag are simultaneously transmitted, the third flag is received while the second flag is being transmitted, or the second flag is received while the third flag is being transmitted, the station does not maintain the synchronization system. By detecting this, even if the synchronous system cannot be maintained due to the failure of the line between two or more stations among the lines not used for time synchronization control, another line not used for synchronization control is unnecessary. Thus, it is possible to reliably monitor the synchronous system without being affected by the line failure.
次に本発明の実施例について図面を参照して説明する。 Next, embodiments of the present invention will be described with reference to the drawings.
第１図は本発明一実施例時刻同期監視方法を示す図であ
り、４端子構成の装置である。常時同期系は局Ａに局
Ｂ、局Ｂに局Ｃ、局Ｃに局Ｄおよび局Ｄに局Ａが従属し
ている。FIG. 1 is a diagram showing a time synchronization monitoring method according to an embodiment of the present invention, which is an apparatus having a four-terminal configuration. In the constant synchronization system, station A is subordinate to station A, station B is station C, station C is station D, and station D is station A.
局Ａから局Ｂの回線に障害（障害部ａ）が発生した場合
に、局Ｂは局Ａに従属できなくなったことを検出すると
ともに、局ＡにフラグＦ１を送信してこのことを通知す
る。局ＡはフラグＦ１を局Ｂより受信することにより局
Ａ−局Ｂ間にて同期系か切断されたことを知るととも
に、局Ｄに対しフラグＦ２を送信して通知する。一方、
局Ｂは局ＣへフラグＦ３を送信することにより同期系が
切断されたことを通知する。When a failure (failure part a) occurs in the line from the station A to the station B, the station B detects that the station A cannot be subordinated to the station A and sends a flag F1 to the station A to notify it. . By receiving the flag F1 from the station B, the station A knows that the synchronous system has been disconnected between the station A and the station B, and notifies the station D by transmitting the flag F2. on the other hand,
The station B notifies the station C that the synchronous system has been disconnected by transmitting the flag F3.
局Ｄから局Ｃの回線に障害（障害部ｂ）が発生した場合
に、局Ｃにて時間差ＴＭの値の計測ができなくなるため
に時間差ＴＭの値を局Ｄへ送れなくなり局Ｄは局Ｃに従
属できなくなる。このため局Ｃは、局Ｃ−局Ｄ間で同期
系が切断されたことを検出するとともに、局Ｄにフラグ
Ｆ１を送信して通知する。局ＤはフラグＦ１を受信する
と、局Ｃに従属することを禁止するとともに局Ｃ−局Ｄ
間にて同期系が切断されていることを局ＡへフラグＦ３
を送信して通知する。一方、局Ｃは局Ｂへフラグ２を送
信することにより局Ｃ−局Ｄ間で同期系が切断されたこ
とを通知する。When a failure (failure part b) occurs in the line from the station D to the station C, the value of the time difference TM cannot be sent to the station D because the station C cannot measure the value of the time difference TM. Can no longer be subordinate to. Therefore, the station C detects that the synchronous system has been disconnected between the station C and the station D, and also notifies the station D by transmitting the flag F1. When the station D receives the flag F1, the station D is prohibited from subordinate to the station C and the station C-station D
Flag F3 to station A that the synchronous system has been disconnected during
To notify you. On the other hand, the station C sends a flag 2 to the station B to notify that the synchronous system has been disconnected between the station C and the station D.
障害部ａと障害部ｂとの障害が同時に発生した場合に、
局ＡではフラグＦ２を送信中にフラグＦ３を送信、局Ｂ
ではフラグＦ３を送信中にフラグＦ２を受信、局Ｃでは
フラグＦ２を送信中にフラグＦ３を受信および局Ｄでは
フラグＦ３を送信中にフラグＦ２を受信することによ
り、同期系が維持不可能であることを検出する。When the obstacles a and b occur at the same time,
Station A transmits flag F3 while transmitting flag F2, station B transmits
Since the flag F2 is received during transmission of the flag F3, the flag F3 is received during transmission of the flag F2 at the station C, and the flag F2 is received during transmission of the flag F3 at the station D, the synchronous system cannot be maintained. Detect that there is.
以上は４端子構成を例にとって説明を行ったが３端子構
成においても全く同様である。Although the above description has been made by taking the 4-terminal configuration as an example, the same applies to the 3-terminal configuration.
第２図は本発明の他の実施例時刻同期監視方法を示す図
であり、６端子構成の装置である。５端子以上に対して
は、第２図に示すようにフラグＦ２およびフラグＦ３を
それぞれ上位局および下位局に中継送信することにより
同一の原理で監視可能である。FIG. 2 is a diagram showing a time synchronization monitoring method according to another embodiment of the present invention, which is an apparatus having a 6-terminal configuration. For 5 terminals or more, as shown in FIG. 2, the flag F2 and the flag F3 can be monitored by the same principle by relay-transmitting them to the upper station and the lower station, respectively.
以上説明したように、第一の発明は、同期制御に利用さ
れない他の回線が不必要でその回線の障害に影響されず
に確実に同期系の監視を行うことができる優れた効果が
ある。As described above, the first aspect of the invention has an excellent effect that it is possible to reliably monitor the synchronous system without being affected by the failure of the other line which is unnecessary for the other line which is not used for the synchronization control.
第二の発明は、３局以上がループ状態に全二重回線を介
して接続された場合に、時刻同期制御に利用される局間
の回線のうちの２組以上の局間の回線の障害に基づく同
期系の維持不能状態でも時刻同期制御に利用される回線
を使って監視することにより、同期制御に利用されない
他の回線が不必要でその回線の障害に影響されずに確実
に同期系の監視を行うことができる優れた効果がある。A second invention is a failure of a line between two or more stations among the lines used for time synchronization control when three or more stations are connected in a loop state via a full-duplex line. Even if it is not possible to maintain the synchronization system based on the above, by monitoring using the line used for time synchronization control, it is possible to ensure that the synchronization system is not affected by other lines not used for synchronization control and is not affected by the line failure. There is an excellent effect that can be monitored.
第１図は本発明一実施例時刻同期監視方法を示す図。 第２図は本発明の他の実施例時刻同期監視方法を示す
図。 第３図は２局間の時刻同期方式を示す図。 第４図は４端子構成の装置の時刻同期方式を示す図。 第５図は従来例の時刻同期監視方法を示す図。 Ａ〜Ｆ……局、Ｆ１〜Ｆ３……フラグ、ａ〜ｄ……障害
部、ｅ、ｇ……送信タイミング、ｆ、ｈ……受信タイミ
ング、ＴＭ、ＴＳ……時間差。FIG. 1 is a diagram showing a time synchronization monitoring method according to an embodiment of the present invention. FIG. 2 is a diagram showing a time synchronization monitoring method according to another embodiment of the present invention. FIG. 3 is a diagram showing a time synchronization method between two stations. FIG. 4 is a diagram showing a time synchronization method of an apparatus having a four-terminal configuration. FIG. 5 is a diagram showing a conventional time synchronization monitoring method. A to F ... Stations, F1 to F3 ... Flags, a to d ... Obstacles, e, g ... Transmission timing, f, h ... Reception timing, TM, TS ... Time difference.
Claims (2)
回線を使用して時刻同期制御を行う複数の局間の回線障
害に対して同期系が維持されていないことを検出する 時刻同期監視方法において、 局間の回線障害が発生し、同期系が維持されないことを
時刻同期制御を行うことで検出した障害回線の一方の局
は第１フラグをこの障害回線に送信し、 この第１フラグを受信したこの障害回線の他方の局は同
期系が維持されていないことを検出することを特徴とす
る時刻同期監視方法。1. It is detected that a synchronous system is not maintained against a line failure between a plurality of stations connected via a full-duplex line and performing time synchronization control using this full-duplex line. In the time synchronization monitoring method, one station of the faulty line detected by performing the time synchronization control that a line fault has occurred between the stations and the synchronous system is not maintained transmits the first flag to this faulty line, A time synchronization monitoring method characterized in that the other station of the faulty line that has received the first flag detects that the synchronization system is not maintained.
この全二重回線を使用して従属同期系を構成し時刻同期
制御を行う３個以上の局間の回線障害に対して同期系が
維持されていないことを検出する 時刻同期監視方法において、 局間の回線障害が発生し、同期系が維持されていないこ
とを時刻同期制御を行うことで検出した障害回線の一方
の局は第１フラグをこの障害回線に送信し、 この第１フラグを受信したこの障害回線の他方の局は同
期系が維持されていないことを検出し、 上記障害回線の上位局は第２フラグをその上位局に上記
全二重回線を介して送信し、 上記障害回線の下位局は第３フラグをその下位局に上記
全二重回線を介して送信し、 第２フラグおよび第３フラグを同時に送信する場合、第
２フラグを送信中に第３フラグを受信する場合、または
第３フラグを送信中に第２フラグを受信する場合にはそ
の局は同期系が維持されていないことを検出する ことを特徴とする時刻同期監視方法。2. Connected in a loop through a full-duplex line,
This full-duplex line is used to configure a subordinate synchronization system to perform time synchronization control. Detecting that the synchronization system is not maintained against a line failure between three or more stations. One station of the faulty line detected by performing time synchronization control that a line fault has occurred and the synchronous system is not maintained, transmits the first flag to this faulty line, and receives this first flag. The other station of the faulty line detects that the synchronous system is not maintained, and the upper station of the faulty line sends a second flag to the higher station via the full-duplex line, Lower station transmits the third flag to the lower station via the full-duplex line, simultaneously transmits the second flag and the third flag, and receives the third flag while transmitting the second flag. , Or the second flag while transmitting the third flag. Time synchronization monitoring method characterized by detecting that the station has not been synchronized system is maintained in the case of receiving.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP26046786A JPH0644754B2 (en) | 1986-10-30 | 1986-10-30 | Time synchronization monitoring method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP26046786A JPH0644754B2 (en) | 1986-10-30 | 1986-10-30 | Time synchronization monitoring method |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS63114331A JPS63114331A (en) | 1988-05-19 |
| JPH0644754B2 true JPH0644754B2 (en) | 1994-06-08 |
Family
ID=17348354
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP26046786A Expired - Lifetime JPH0644754B2 (en) | 1986-10-30 | 1986-10-30 | Time synchronization monitoring method |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0644754B2 (en) |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0644753B2 (en) * | 1986-06-10 | 1994-06-08 | 三菱電機株式会社 | Sampling synchronization monitoring method |
-
1986
- 1986-10-30 JP JP26046786A patent/JPH0644754B2/en not_active Expired - Lifetime
Non-Patent Citations (1)
| Title |
|---|
| ＮＥＣ技報、第３５巻、第１号（昭和５７−１−２５）、Ｐ．５８〜６３ |
Also Published As
| Publication number | Publication date |
|---|---|
| JPS63114331A (en) | 1988-05-19 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| EXPY | Cancellation because of completion of term |