JPS6352089A - Time synchronizing system for network - Google Patents
Time synchronizing system for networkInfo
- Publication number
- JPS6352089A JPS6352089A JP61195443A JP19544386A JPS6352089A JP S6352089 A JPS6352089 A JP S6352089A JP 61195443 A JP61195443 A JP 61195443A JP 19544386 A JP19544386 A JP 19544386A JP S6352089 A JPS6352089 A JP S6352089A
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- master station
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- 238000004891 communication Methods 0.000 claims abstract description 30
- 230000005540 biological transmission Effects 0.000 claims abstract description 28
- 238000000034 method Methods 0.000 claims description 5
- 230000007246 mechanism Effects 0.000 abstract description 66
- 238000012545 processing Methods 0.000 abstract description 35
- 238000001514 detection method Methods 0.000 abstract description 16
- 238000012937 correction Methods 0.000 abstract description 14
- 230000015572 biosynthetic process Effects 0.000 abstract 1
- 238000004088 simulation Methods 0.000 description 6
- 238000010586 diagram Methods 0.000 description 3
- 230000000694 effects Effects 0.000 description 3
- 238000005516 engineering process Methods 0.000 description 2
- 238000012544 monitoring process Methods 0.000 description 2
- 210000003127 knee Anatomy 0.000 description 1
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Abstract
Description
【発明の詳細な説明】
〔産業上の利用分野〕
本発明は、ネットワークの時刻同期に係り特にネットワ
ーク内の各局にて発生した事象を時系列に処理するに好
適なネットワークの時刻同期方式〔従来の技術〕
従来、ネットワークの時刻を同期する方法として、例え
ば特開昭５８−１４７６７４号公報に示されるように、
主局が従局の時刻情報を読み取り、主局の現時刻とチェ
ックすることにより、その時間差分値により従局の時刻
を整時することが仰られている。この方法は、主局と従
局間の通信回線における伝送時間については配慮されて
いない。[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to network time synchronization, and particularly relates to a network time synchronization method [conventional] suitable for processing events occurring at each station in the network in chronological order. [Technology] Conventionally, as a method for synchronizing network time, for example, as shown in Japanese Patent Application Laid-open No. 147674/1983,
It is said that the master station reads the time information of the slave station, checks it with the current time of the master station, and adjusts the time of the slave station based on the time difference value. This method does not take into account the transmission time in the communication line between the master station and the slave station.
上記従来技術は、主局と従局間の通信回線における伝送
時間が配慮されておらず、整時時間は通信回線の伝送時
間による設定誤差以上の粗いものネットワーク各局間の
通信回線の伝送時間にとられれることなく、各局間の同
期をとるための整時情報を作成するネットワークの時刻
同期方式を提供することにある。The above conventional technology does not take into account the transmission time on the communication line between the master station and the slave station, and the timing time is rougher than the setting error due to the transmission time of the communication line. The purpose of the present invention is to provide a network time synchronization method that creates timing information for synchronizing each station without being overwritten.
上記目的は、主局が従局の時刻読取り時の通信回線の伝
送時間を検出し、該検出時間で従局から読取った時刻を
補正することにより、主局の設定時刻と従局の検出時刻
の通信回線の伝送時間による遅れを無（することにより
、連取される。The above purpose is to detect the transmission time of the communication line when the master station reads the time of the slave station, and to correct the time read from the slave station using the detected time. By eliminating the delay due to the transmission time of
通信回線の伝送時間の検出は、主局が従局に対する時刻
読取りコマンド発信から、応答受信までの時間を監視し
、時間の半分を補正データとして使用する。この時、送
信データと受信データ長を同じくするため、監視時間の
半分が片道伝送時間と等しくなる。このため、検出した
伝送時間を従局から読取った時刻に加えることにより、
主局が時刻読取コマンド発信時の従局の時刻を擬似化す
ることができる。To detect transmission time on a communication line, the master station monitors the time from when it issues a time reading command to the slave station until it receives a response, and uses half of the time as correction data. At this time, since the length of the transmitted data and the received data are the same, half of the monitoring time is equal to the one-way transmission time. Therefore, by adding the detected transmission time to the time read from the slave station,
It is possible to simulate the time of the slave station when the master station issues the time reading command.
以下、本発明の一実施例を図面により詳細に説明する。 Hereinafter, one embodiment of the present invention will be described in detail with reference to the drawings.
第１図は本発明の一実施例の構成を示すネットワークシ
ステムのブロック図である。第１図において主局Ｍ、従
局Ｓは中央処理装置１＃１１を各々備え、中央処理装置
１．１１には時計機構２．１２があり各々時刻を作成す
る。検出機構５は、従局への時刻読取り要求発信から応
答受信までの時間を検出する。FIG. 1 is a block diagram of a network system showing the configuration of an embodiment of the present invention. In FIG. 1, the master station M and the slave station S are each equipped with a central processing unit 1.11, and the central processing unit 1.11 has a clock mechanism 2.12 to prepare the time. The detection mechanism 5 detects the time from sending a time reading request to the slave station to receiving a response.
また、擬似化機構５は、検出機構３の検出時間をもとに
主局から従局への通信回線１０の伝送時間を疑似作成し
、補正機構５は、従局から読取った時刻を疑似化機構４
の疑似伝送時間をもとに主局の整時設定時刻に対する従
局の検出すべき実時刻に補正し、比較機構７は、補正機
構５で作成された従局の疑似時刻と主局の整時設定時刻
とを比較し、その時間差を検出する。そして、整時＠構
１８は、主局からの整時清報により時計機構１２の時刻
を整時する。Further, the simulating mechanism 5 creates a pseudo transmission time of the communication line 10 from the master station to the slave station based on the detection time of the detection mechanism 3, and the correction mechanism 5 uses the time read from the slave station to create a pseudo
Comparison mechanism 7 corrects the master station's timing setting time to the actual time to be detected by the slave station based on the pseudo transmission time of Compare the time and detect the time difference. The timing mechanism 18 then adjusts the time of the clock mechanism 12 based on the timing notification from the main station.
さらに、送受信機構６．１６は、主局の中央処理装置１
と従局の中央処理袋ｒＩＬ１１との間の情報交換のだめ
のデータを通信回ａ１０に送信又は受信するものであり
、また、制御機構８．１８は、本時刻制御のためにオペ
レータコンソール９やソフトウェアとのインタフェース
をとるものである。Furthermore, the transmitting/receiving mechanism 6.16 includes the central processing unit 1 of the main station.
The control mechanism 8.18 transmits or receives data for information exchange between the central processing bag rIL11 of the slave station and the communication line a10, and the control mechanism 8.18 also communicates with the operator console 9 and software for this time control. interface.
第２図は本発明の一実施例の動作を示すフローチャート
である。FIG. 2 is a flowchart showing the operation of one embodiment of the present invention.
以下第１図と第２図により、本発明の詳細な説明する。The present invention will be explained in detail below with reference to FIGS. 1 and 2.
まず、主局の中央処理装置１０制御機構８がオペレータ
コンソール９またはソフトウェアの指令により整時開始
動作に入る（ステップ２０）。主局中央処理装置１から
の整時割込みコマンド（２０α）が送受信機構６、通信
回線１０を介して従局中央処理装置１１に送信される。First, the control mechanism 8 of the central processing unit 10 of the main station enters a timing start operation in response to a command from the operator console 9 or software (step 20). A timing interrupt command (20α) from the master station central processing unit 1 is transmitted to the slave station central processing unit 11 via the transmitting/receiving mechanism 6 and the communication line 10.
従局中央処理装置１１の送受信機構１６は整時割込コマ
ンド（２Ｏａ ）を受けると制御機構１８に渡す。When the transmitting/receiving mechanism 16 of the slave central processing unit 11 receives the timed interrupt command (2Oa), it passes it to the control mechanism 18.
制御機構１８は、中央処理装置１１の状態が整時動作の
割込み可かチェックする（ステップ２１）。これは中央
処理装置ｔ１１が業務実行中であると、主局からの時刻
情報読取要求に対し、動作量の状態となりタイムリーな
情報が送信できな（なるため状態をチェックするもので
ある。なお、従局の中央処理装置１１では、実行業務動
作と整時割込み動作量で必要に応じた優先度をつけてお
き、相互動作に支障がないよう制御するものである。The control mechanism 18 checks whether the state of the central processing unit 11 allows interrupts for timing operations (step 21). This is to check the status because if the central processing unit t11 is executing a task, it will be in a state of operation volume and will not be able to send timely information in response to a time information reading request from the main station. In the central processing unit 11 of the slave station, priority is assigned as necessary based on the amount of execution work operations and timed interrupt operations, and control is performed so that mutual operations are not hindered.
この時、割込み可（ステップ２１）がＮｏであれば、従
局中央処理装置１１は送受信機構１６９通信回線１０を
介して否定応答（２１ａ ）を主局中央処理装置１に送
信する。主局中央処理装置１は、否定応答（２１＆ ’
） ’４ｒ：受けると動作を終了させる（ステップ２２
）。また、割込み可（ステップ２１）がＹＥＳであれば
、従局中央処理装置１１は、実行中の業務で時刻整時動
作に影響する業務を保留する（ステップ２３）とともに
、送受信機構１６、通信回線１０を介し【肯定応答（２
３ａ ）を主局中央処理装置１に送信する。At this time, if the interrupt enable (step 21) is No, the slave central processing unit 11 transmits a negative response (21a) to the master central processing unit 1 via the transmitting/receiving mechanism 169 communication line 10. The main station central processing unit 1 receives a negative response (21&'
) '4r: Ends the action when received (step 22
). Further, if the interrupt enable (step 21) is YES, the slave central processing unit 11 suspends the currently executing work that affects the time setting operation (step 23), and also interrupts the transmitting/receiving mechanism 16, the communication line 10, [Acknowledgement (2)
3a) is transmitted to the main station central processing unit 1.
主局中央処理装置１では、肯定応答（２３ａ ）を受け
ると、制御機構８は、時計機構２からその時の時刻読取
しくステップ２４）、該時刻を比較機構７ｖｃ時刻記憶
する（ステップ２６）と同時に、検出機構３０時間監視
タイマをカウント開始する（ステップ２７）。また、こ
の時、送受信機構６、通信回線１０を介して従局の時刻
読取要求（２４ａ ）を従局中央処理装置１１に送信す
る。In the main station central processing unit 1, upon receiving an affirmative response (23a), the control mechanism 8 reads the current time from the clock mechanism 2 (step 24), and simultaneously stores the time in the comparison mechanism 7vc (step 26). , the detection mechanism 30-hour monitoring timer starts counting (step 27). Also, at this time, a slave station time reading request (24a) is transmitted to the slave station central processing unit 11 via the transmitting/receiving mechanism 6 and the communication line 10.
従局中央処理装置１１では、読取要求コマンド（２４ａ
）を受けると、時計機構１２よりその時の時刻馨読取２
５、送受信機構１へ通信回線１０を介して時刻応答（２
５ａ ）を主局中央処理装［１に送信する。The slave central processing unit 11 issues a read request command (24a
), the clock mechanism 12 reads the current time 2.
5. Time response (2
5a) to the main station central processing unit [1.
主局中央処理装置１は、時刻応答（２５４＆ ） ｗ受
けると、検出機構３０時間カウントＹ終了（２７ａ ）
させる。検出機構３の時間カウントが終了すると、擬似
化機構４では、該カウント結果より従局読取時刻の通信
回線の伝送時間による補正データ（２８）！作成する。When the main station central processing unit 1 receives the time response (254&), the detection mechanism ends the 30-hour count (27a).
let When the time count of the detection mechanism 3 is completed, the simulation mechanism 4 uses the count result to generate correction data (28) based on the transmission time of the communication line at the slave station reading time! create.
、検出機構４でのカウント時間は、従局の時刻読取要求
（２１Ｋ ）を送信してから時刻応答（２５ａ ）が到
ｆｆ１ｆるｆでの通信回線１０の往復伝送時間をカウン
トしたもので、擬似化機構４での補正データ（２８）は
該検出時間を半分にしたもので、片道の通信回線１０の
伝送時間？擬似化したものである。, the count time in the detection mechanism 4 is calculated by counting the round-trip transmission time of the communication line 10 from when the time response (25a) arrives after sending the time reading request (21K) of the slave station to f, and is simulated. The correction data (28) in the mechanism 4 is the detection time halved, which is the transmission time of the one-way communication line 10? It is a simulation.
なお、この時の、時刻読取要求（２４ａ ）と時刻応答
（２Ｓａ ）のデータ長を等しくして送信するものとす
る。また、擬似化機構４では、必要に応じて中央処理装
置１．１１の処理時間を加味してもよく、これらはパラ
メータ等で容易に変更できるようにしておく。At this time, it is assumed that the time reading request (24a) and the time response (2Sa) are transmitted with the same data length. Furthermore, in the simulation mechanism 4, the processing time of the central processing unit 1.11 may be taken into consideration as needed, and these can be easily changed using parameters or the like.
補正機構５では補正データ（２８）と従局中央処理装置
１１の時刻応答（２Ｓａ ）の時刻から通信回線１０の
伝送時間を加味した補正時刻（２９）を作成する。The correction mechanism 5 creates a correction time (29) based on the correction data (28) and the time of the time response (2Sa) of the slave central processing unit 11, taking into account the transmission time of the communication line 10.
比較機構７では、従局中央処理装置１１への時刻読取要
求（２ａａ ）発信時の時刻記ｔ１２６と該補正時刻（
２９）Ｙ時刻比較しくステップ３０）、その時間差分値
を検出する。該時間差分値検出で時間差有（ステップ３
１）がＮｏの場合くは、整時不安のため送受信機構６１
通信回ａ１０を介して終了指令コマンド（３５）を従局
中央処理装置１１へ送信する。The comparison mechanism 7 compares the time record t126 at the time of issuing the time reading request (2aa) to the slave central processing unit 11 and the corrected time (
29) Compare Y time and detect the time difference value in step 30). There is a time difference by detecting the time difference value (step 3)
If 1) is No, the transmitter/receiver mechanism 61
A termination command (35) is sent to the slave central processing unit 11 via the communication line a10.
従局中央処理装置１１では、終了老令コマ／ド（３５）
ヲ受けると、整時動作のために保留してあった業務を保
留解除３６シて動作を終了する。In the slave central processing unit 11, the end old command (35)
When the request is received, the work that has been put on hold for the timely operation is released from hold (36) and the operation is completed.
また、時間差有（ステップ３１）がＹＥＳの場合、整時
動作のりトライ回数３１４が規定Ｎ回数ＹＥＳであれば
、オペレータコンソール９またはソフトウェアに障害報
告（３２）をし必要な処置をゆだねる。ＮＯの場合には
、時刻比較（ステップ３０）結果より従局の時刻の整時
時間（３３）を作成し、送受信機構６００通信線１０を
介して整時データ（５３ｔｔ）を従局中央処理装置１１
に送信する。Further, if the presence of a time difference (step 31) is YES, and if the number of times the timing operation is tried 314 is YES the predetermined N times, a failure report is made to the operator console 9 or software (32) and necessary measures are entrusted to the operator console 9 or software. In the case of NO, the slave station's time setting time (33) is created from the time comparison (step 30) result, and the timing data (53tt) is sent to the slave station central processing unit 11 via the transmitting/receiving mechanism 600 communication line 10.
Send to.
従局中央処理装置１１では、整時データ（３３，＆ ）
を受信すると整時機構１７により時計機構１２の時刻を
整時する（ステップ３４）と同時圧、整時応答（３４ａ
）を送受信機構１６、通信口＠１０を介して主局中央処
理装置！Ｉｔ１に送信する。主局中央処理装置１では、
整時応答（３４α）を受けると、再度時刻読取（ステッ
プ２４）の状態に入り、整時結果の確認を行う。以降の
動作は、いままでに述べてきたものと同じとなる。In the slave central processing unit 11, the timing data (33, &)
When receiving the clock, the timing mechanism 17 sets the time of the clock mechanism 12 (step 34), and a simultaneous pressure and timing response (34a) are received.
) to the main station central processing unit via the transmitting/receiving mechanism 16 and the communication port @10! Send to It1. In the main station central processing unit 1,
Upon receiving the timing response (34α), the device enters the state of time reading (step 24) again and confirms the timing result. The subsequent operations are the same as those described above.
次に、第６図により従局補正時刻作成の具体例を説明す
る。Next, a specific example of creating slave station correction time will be explained with reference to FIG.
いま、主局Ｍの時計機構２の時刻は「１２時５４分５６
秒」５０、従局Ｓの時計機構１２の時刻は「１２時５４
分５４秒」６０と２秒の時間差がある状態の時に整時動
作を行５ｍ合を考えろ。Now, the time on clock mechanism 2 of main station M is 12:54:56.
"second" 50, and the time of the clock mechanism 12 of slave station S is "12:54.
Consider a case where the timing operation is performed in a row of 5 m when there is a time difference of 2 seconds between ``minutes 54 seconds'' and 60 seconds.
まず、主局間より時刻読取要求２４６１コマンドを従局
Ｓに送信する。この時、該時刻「１２時３４分５６秒Ｊ
５０ａＹ比較機構７に記憶すると同時に、検出機構３０
時間カウントを開始７０する。なお、主局Ｍと従局Ｓ間
の通信回線の伝送時間は１秒かかるものと仮定する。First, a time reading request 2461 command is sent from the master station to the slave station S. At this time, the time "12:34:56 J
50aY is stored in the comparison mechanism 7, and at the same time the detection mechanism 30
Start time count to 70. It is assumed that the transmission time of the communication line between the master station M and the slave station S is 1 second.
従局Ｓでは、時刻読取要求（２４１）コマンドン受ける
と通信回線の伝送時間１秒経過後の「１２時３４分５５
秒」６１を時計機構１２から読取り、該時刻応答（２５
ａｌ ）を主局Ｎ１に送信する。主局Ｍでは、該時刻応
答（２５ａｌ ）を受信すると、検出機構３の時間カウ
ントを終了７１させろ。この時のカウント時間は、通信
回線往復伝送時間の「２秒」７１となる。擬似化機構４
では検出機構３の該検出時間をもとに補正データ「１秒
」７２を作成する。When the slave station S receives the time reading request (241) command, it reads "12:34:55" after 1 second of communication line transmission time has elapsed.
"second" 61 is read from the clock mechanism 12, and the time response (25
al ) to the main station N1. When the main station M receives the time response (25al), it causes the detection mechanism 3 to end the time count (71). The count time at this time is "2 seconds" 71, which is the communication line round trip transmission time. Simulation mechanism 4
Then, based on the detection time of the detection mechanism 3, correction data "1 second" 72 is created.
該補正データ「１秒」７２は、通信口、線の往復伝送時
間の半分と仮定し、検出機構３のカウント時間「２秒」
７１を半分としたものである。The correction data "1 second" 72 is assumed to be half the round-trip transmission time of the communication port and line, and the count time of the detection mechanism 3 is "2 seconds".
71 is halved.
補正機構５では、従局Ｓからの時刻応答「１２時３４分
５５秒Ｊ ｄｌａから補正データ「１秒」７２暴を通信
回線の伝送時間値れとして差引（ことで従局Ｓの整時設
定時刻「１２時３４分５４秒」７５を擬似化する。The correction mechanism 5 subtracts the correction data "1 second" 72 from the time response "12:34:55 J dla" from the slave station S as the transmission time value of the communication line (thereby, the time setting time of the slave station S is 12:34:54” 75 is simulated.
擬似化機構７では、主局へ１の該整時設定時刻「１２時
３４分５６秒Ｊ （ｓｏａ ）と従局Ｓの該擬似化時刻
「１２時５４分５４秒Ｊ （７５ａ ）を比較し従局Ｓ
の連れ時間「２秒」７４を検出する。The simulation mechanism 7 compares the timing setting time "12:34:56 J (soa)" of the master station 1 with the simulated time "12:54:54 J (75a)" of the slave station S and sends it to the slave station. S
The delay time "2 seconds" 74 is detected.
主局Ｍは、該整時時間「２秒」７４１に整時データ３２
ａ１として従局Ｓに送信する。従局Ｓの整時機構１７は
、その時の時刻を「１２時３４分５８秒」６２とすると
、該時刻に整時データ「２秒Ｊ （７４ａ ）を加える
ことにより、整時時刻「１２時３５分００秒」６５を得
る。The main station M receives the timing data 32 at the timing time “2 seconds” 741.
It is sent to slave station S as a1. If the time at that time is "12:34:58" 62, the timing mechanism 17 of the slave station S adds the timing data "2 seconds J (74a)" to the time, so that the timing mechanism 17 sets the timing "12:35". Minutes 00 seconds”65.
以上の説明から明らかなように本発明によればネットワ
ーク内の各局間の時刻同期のデータを、通信口ａを使用
して送受信する際に通信回線の伝送時間による連れの時
間を気にせずに簡単に同期ができるという効果が得られ
る。As is clear from the above description, according to the present invention, time synchronization data between each station in the network can be sent and received using communication port a without worrying about the time lag caused by the transmission time of the communication line. This provides the effect of easy synchronization.
′ｙ４１図は本発明の一実施例の構成を示すブロック図
、第２図は本発明の一実施例の動作を示すフローチャー
ト、第３図は本発明の詳細な説明するための図である。
１・１１・・・中央処理装置、２，１２・−時計機構、
３・・・検出機構、４・・・擬似化機構、５・・・補正
機構、へ１６ ・・・送受信機構、７・・・比較機構、
８．１８・・・制御機ａ、９−・・オペレータコンソー
ル、１０・・・通信回線。
、・−５＼
、ニー41 is a block diagram showing the configuration of one embodiment of the present invention, FIG. 2 is a flowchart showing the operation of one embodiment of the present invention, and FIG. 3 is a diagram for explaining the present invention in detail. 1.11...Central processing unit, 2,12.-Clock mechanism,
3... Detection mechanism, 4... Simulation mechanism, 5... Correction mechanism, 16... Transmission/reception mechanism, 7... Comparison mechanism,
8.18...controller a, 9-...operator console, 10...communication line. ,・−5＼ , Knee
Claims (1)
生時刻をもとに情報交換を行うネットワークで、該ネッ
トワーク内のある１つの局を主局、他の局を従局とし、
主局の発生時刻をもとに従局の時刻を整時し同期させる
方式において、該主局が該従局への時刻読取り要求送信
から応答受信までの時間を検出するステップと、該検出
された時間から通信回線の伝送時間を擬似的に作成する
ステップと、該擬似の伝送時間より該従局から読取った
時刻を補正するステップと、該従局の補正時刻と該主局
の設定時刻とを比較するステップと、該比較結果より従
局の時刻を整時するステップを有することを特徴とする
ネットワークの時刻同期方式。1. A network consisting of multiple stations with a time generation function, in which each station exchanges information based on the time of occurrence, with one station in the network as the master station and the other stations as slave stations,
In a method of timing and synchronizing the time of a slave station based on the time of occurrence of the master station, the master station detects the time from sending a time reading request to the slave station until receiving a response, and the detected time. a step of creating a pseudo transmission time of the communication line from the above, a step of correcting the time read from the slave station based on the pseudo transmission time, and a step of comparing the corrected time of the slave station with the set time of the master station. and a step of adjusting the time of the slave station based on the comparison result.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP61195443A JPS6352089A (en) | 1986-08-22 | 1986-08-22 | Time synchronizing system for network |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP61195443A JPS6352089A (en) | 1986-08-22 | 1986-08-22 | Time synchronizing system for network |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPS6352089A true JPS6352089A (en) | 1988-03-05 |
Family
ID=16341150
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP61195443A Pending JPS6352089A (en) | 1986-08-22 | 1986-08-22 | Time synchronizing system for network |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS6352089A (en) |
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH02131647A (en) * | 1988-11-11 | 1990-05-21 | Matsushita Electric Ind Co Ltd | Home bus system and its terminal equipment |
| JPH0312585A (en) * | 1989-06-09 | 1991-01-21 | Fujitsu Ltd | Network time setting system |
| KR100433881B1 (en) * | 1997-01-29 | 2004-09-18 | 삼성전자주식회사 | Method for managing system time in a master-slave relation multi-processor environment and an apparatus thereof, especially regarding to deciding system time without intervention of a system operator |
| JP2005260966A (en) * | 2004-03-10 | 2005-09-22 | Lucent Technol Inc | Method and system for clock synchronization of network terminal |
| JP2009290626A (en) * | 2008-05-30 | 2009-12-10 | Kddi Corp | Optical transmission system and time reference pulse synchronizing method |
| JP2011008474A (en) * | 2009-06-25 | 2011-01-13 | Yokogawa Electric Corp | Measurement system |
| JP2017202034A (en) * | 2016-05-09 | 2017-11-16 | キヤノン株式会社 | Radiation imaging apparatus, radiation imaging system, radiation imaging method, and program |
-
1986
- 1986-08-22 JP JP61195443A patent/JPS6352089A/en active Pending
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH02131647A (en) * | 1988-11-11 | 1990-05-21 | Matsushita Electric Ind Co Ltd | Home bus system and its terminal equipment |
| JPH0312585A (en) * | 1989-06-09 | 1991-01-21 | Fujitsu Ltd | Network time setting system |
| KR100433881B1 (en) * | 1997-01-29 | 2004-09-18 | 삼성전자주식회사 | Method for managing system time in a master-slave relation multi-processor environment and an apparatus thereof, especially regarding to deciding system time without intervention of a system operator |
| JP2005260966A (en) * | 2004-03-10 | 2005-09-22 | Lucent Technol Inc | Method and system for clock synchronization of network terminal |
| JP2009290626A (en) * | 2008-05-30 | 2009-12-10 | Kddi Corp | Optical transmission system and time reference pulse synchronizing method |
| JP2011008474A (en) * | 2009-06-25 | 2011-01-13 | Yokogawa Electric Corp | Measurement system |
| JP2017202034A (en) * | 2016-05-09 | 2017-11-16 | キヤノン株式会社 | Radiation imaging apparatus, radiation imaging system, radiation imaging method, and program |
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