EP2622798A2 - Procédé et système d'enregistrement, de synchronisation et d'analyse de données au moyen d'appareils d'analyse répartis spatialement dans un réseau de communication - Google Patents

Procédé et système d'enregistrement, de synchronisation et d'analyse de données au moyen d'appareils d'analyse répartis spatialement dans un réseau de communication

Info

Publication number
EP2622798A2
EP2622798A2 EP11766970.5A EP11766970A EP2622798A2 EP 2622798 A2 EP2622798 A2 EP 2622798A2 EP 11766970 A EP11766970 A EP 11766970A EP 2622798 A2 EP2622798 A2 EP 2622798A2
Authority
EP
European Patent Office
Prior art keywords
data
analysis
analysis devices
received
time
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.)
Withdrawn
Application number
EP11766970.5A
Other languages
German (de)
English (en)
Inventor
Ulrich Kaemmerer
Michael Hortig
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Schneider Electric Automation GmbH
Original Assignee
Schneider Electric Automation GmbH
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Schneider Electric Automation GmbH filed Critical Schneider Electric Automation GmbH
Publication of EP2622798A2 publication Critical patent/EP2622798A2/fr
Withdrawn legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L7/00—Arrangements for synchronising receiver with transmitter
    • H04L7/0079—Receiver details
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L12/00—Data switching networks
    • H04L12/28—Data switching networks characterised by path configuration, e.g. LAN [Local Area Networks] or WAN [Wide Area Networks]
    • H04L12/40—Bus networks
    • H04L12/407—Bus networks with decentralised control
    • H04L12/417—Bus networks with decentralised control with deterministic access, e.g. token passing
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L43/00—Arrangements for monitoring or testing data switching networks
    • H04L43/10—Active monitoring, e.g. heartbeat, ping or trace-route
    • H04L43/106—Active monitoring, e.g. heartbeat, ping or trace-route using time related information in packets, e.g. by adding timestamps
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L43/00—Arrangements for monitoring or testing data switching networks
    • H04L43/18—Protocol analysers
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L67/00—Network arrangements or protocols for supporting network services or applications
    • H04L67/01—Protocols
    • H04L67/10—Protocols in which an application is distributed across nodes in the network
    • H04L67/1095—Replication or mirroring of data, e.g. scheduling or transport for data synchronisation between network nodes
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04J—MULTIPLEX COMMUNICATION
    • H04J3/00—Time-division multiplex systems
    • H04J3/02—Details
    • H04J3/06—Synchronising arrangements
    • H04J3/0635—Clock or time synchronisation in a network
    • H04J3/0638—Clock or time synchronisation among nodes; Internode synchronisation
    • H04J3/0644—External master-clock

Definitions

  • the invention relates to a method for recording, synchronization and analysis of data by means of a communication network such as real-time Ethernet network spatially distributed analysis devices according to the preamble of claim 1 and to a system for performing the method according to the preamble of Claim 5.
  • the article describes a NetFTGA-based network interface card that provides transparent GPS time synchronization.
  • the card allows accurate timestamping of received packets and the transmission of bursts of packets at a precise distance.
  • the known method is characterized in that received data frames are stored in a memory. Once a data frame is to be stored in the memory, this is first marked by means of a timing module with a time stamp of the absolute time of the received GPS signal and then stored.
  • TCP Transmission Control Protocol
  • DE-A-10 2008 010 536 relates to a circuit arrangement and a method for the synchronization of clocks in a network having a plurality of at least two nodes, wherein at least two of these nodes can communicate with each other and each have a local clock.
  • At least one transmitting other such node receives a global time of the transmitting node originating from this transmitting node. Depending on both the receiving global node's receiving time and the receiving node's own local time, a global time of this receiving node is determined or estimated.
  • DE-T-602 11 157 relates to a synchronous playback of media packets. This includes sending time-tagged media data packets to one or more receiving media sinks, wherein the time tagging indicates the time for generating the corresponding media data packet, determining a playtime offset once for all media data packets of a period, and broadcasting the playtime offset to the one or more media data sinks (M). once for all media data packages of a period.
  • a data capture mode the data is written to the hard disk of an analysis PC.
  • Data recording can take place in the "Ethernet mode” operating mode in which standard Ethernet telegrams are recorded or in the "Transparent mode” operating mode in which Ethernet telegrams including the preamble and the SFD (Start of Frame Delimiter) are recorded become.
  • the data recording can take place in a "timing analysis mode” (time analysis) in which no frame data are stored, but only time stamps of individual frames are analyzed, with data recording not taking place.
  • a prior art system 10 is shown purely schematically in FIG.
  • the system includes a communication network 12 such as a real-time Ethernet network.
  • a transmitter device 14 is connected via a data line 16 to a port 18 of a first channel 20 of an analysis device 22.
  • a second connection 24 of the first channel 20 is connected via a data line 26 to an Ethernet switch 28, which is connected on the output side via a data line 30 to a connection 32 of a second channel 34 of the analysis device 22.
  • An output 36 of the second channel 34 is connected via a data line 38 with a target device 40, at the output 42, an actuator 44 is connected.
  • the output 42 is fed back via a signal line 46 to a signal input 48 of the analysis device 22.
  • the analysis device 22 comprises an analysis PC 52 with an analysis card 50.
  • the analyzer For analyzers with two recording channels, the analyzer records the Ethernet frames and adds this timestamp.
  • the analysis device or the analysis card is connected via two patch cables from one of the test connection points to an Ethernet connection of the field devices.
  • the data recording is configured or started via software.
  • the analysis device and the analysis software capture the data packets of the communication link, transmit the data packets and store them preferably by DMA (Direct Memory Access) on the hard disk.
  • the stored files such as binary files by software in z. B. converts the open Win Pcap, which with z. B. Wireshark can be analyzed.
  • the analysis device or the analysis card offers the possibility of additionally recording events at up to four digital inputs.
  • the input signals generate a special Ethernet frame in the analyzer or analysis card, which is generated by the analysis card and stored on the hard disk.
  • the time resolution is in the nsec range.
  • Such analysis devices are used, for example, to measure the latency of multiport devices with high accuracy (delay between network input and a network output of a different port) or to measure a time between a process electrical input and an Ethernet Frame, which transmits information or vice versa.
  • analysis cards 50 may be received by a plurality of analysis PCs 52 distributed over the network 12 to be analyzed, in each individual analysis PC 52 the analysis card 50 would assume the absolute time of the analysis PC 52 at program start , Also, the data files must be provided with a time stamp by the analysis card 50 and by its internal clock with high resolution and transmitted to the analysis PC for evaluation.
  • the object of the present invention is to refine a method and a system of the type mentioned at the outset in such a way that recording, synchronization and analysis of data by means of spatially distributed analysis devices is simplified.
  • a method with the features of claim 1 and a system with the features of claim 5 is proposed.
  • the invention is based on the idea to ignore the different absolute times of the analysis devices and to transfer the synchronization to the resulting data files. To accomplish this, all analysis devices receive simultaneously a synchronization signal for triggering time synchronization events which the analysis devices respectively insert during the recording of data frames of a data file as a "pseudo-frame" between the data frames.
  • the time synchronization event is preferably a "pseudo-frame" which is inserted between the received data frames simultaneously, ie independently of the local time of the analyzer, upon receipt of data frames by the individual analysis devices "can be used in the analysis of the recorded data files by means of z.
  • the invention preferably uses as an analysis device an analysis PC such as personal computer with plug-in analysis card, which has at least one digital input to which the synchronization signal is fed, by means of the additional events in the form of "pseudo-frames" in the data -File, ie between data frames of the data file.
  • the time resolution is in the nsec range.
  • a radio receiver is connected to the digital signal input of each analysis card.
  • the radio receiver receives the synchronization signal which is transmitted either by a specific radio transmitter of its own or by a publicly available signal transmitter such as a time signal transmitter (DCF) or a position signal transmitter such as GPS (Global Position System) transmitter.
  • DCF time signal transmitter
  • GPS Global Position System
  • the choice of transmitter affects the achievable accuracy.
  • the DCF signal is used because this is the simplest implementation.
  • a synchronization signal is sent every second which triggers a time synchronization event to insert a "pseudo-frame" into the data file, ie between the data frames, since the DCF signal fades out the second 59 of every minute, this can be used for coarse synchronization, which means that the requirement for a common time synchronization needs to be better than 1 minute in all involved analysis PCs.
  • the method described allows the detection of Ethernet frames in a spatially distributed network, which is more widely distributed than a circuit-based measuring system would allow.
  • a publicly available time base high accuracy can be achieved with little effort.
  • Fig. 1 shows a system for recording and analyzing data traffic between
  • Fig. 3 data files of individual analysis PCs with event synchronization.
  • Fig. 2 shows a system 54 for recording, synchronization and analysis of data traffic between devices 56, 58 spatially distributed networks 60, 62 which are coupled to each other over a runtime of the data to be transmitted communication link 64.
  • the communication path 64 is formed as a radio link.
  • the communication path 64 may also be a wired communication network or a communication, which has a length in the range »100 m, which causes propagation delays.
  • the subnetwork 60 comprises the device 56, for example as a transmitting device, which is connected via a data line 66 to an input 68 of a channel 70 of an analysis device 72.
  • An output 74 of the channel 70 is connected to a wireless communication unit 78 via a data line 76.
  • This is coupled via the wireless communication link 64 to a wireless communication unit 80, which is connected via a data line 82 to an input 84 of a channel 86 of an analyzer 88 of the sub-network 62.
  • An output 90 of the channel 86 is connected via a data line 92 to the device 58 as a target device.
  • the subnetworks 60, 62 are spatially distributed, for example, with a range R »100 m.
  • the analysis device 72, 88 preferably comprises an analysis PC 94, 96 and in each case an analysis card 98, 100 which is designed as a PC plug-in card and is inserted into the analysis PC 94, 96. Furthermore, the analysis cards 98, 100 each comprise a signal input 102, 104, which is connected to a radio receiver 106, 108 for detecting a publicly available synchronization signal in the form of a DCF time signal.
  • a delay time of the wireless transmission between the wireless communication units 78, 80 can be determined as the delay time T 2 -Ti.
  • the different absolute times of the analyzers 72, 88 are ignored and the synchronization is transferred to the resulting data files 128, 130, 132.
  • the analysis cards 98, 100 distributed in the system 54 simultaneously receive the synchronization signal via their radio receivers 106, 108 and respectively generate time synchronization events 110, 112, 114, which in the case of data recording are each referred to as "pseudo frame" 110, 112, 114 are inserted between received data frames 116, 118, 120, 122, 124, 126 of a data file 128, 130, 132, as shown in Fig. 3 (event synchronization).
  • the time synchronization event is inserted into the data files 128, 130, 132 every second. Since the DCF signal fades out the 59th second of each minute, this can be used for coarse synchronization. Thus, it follows that the requirement for a common time synchronization of all involved analyzers 72, 88 need only be better than 1 min. 3 shows the principle of event synchronization, whereby a time synchronization event 110, 112, 114 is inserted synchronously in the data file in the form of the "pseudo frame.” A synchronization of the data files takes place in the analysis of the Dates.
  • the data files acquired by the analysis cards 98, 100 are stored on a storage medium of the analysis PC 94, 96, for example in a PC AP format.
  • the time stamps of the data frames within the data files generated by the respective analysis cards are compared with respect to the inserted time synchronization events.
  • the information of the respective analysis card is encoded as additional information in each data frame. This is necessary to identify the source of the data frame when merging the individual data files. This summary is the final step in program execution.
  • the resulting data file now contains all data frames from all the analysis cards 98, 100 in the correct order.

Landscapes

  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Health & Medical Sciences (AREA)
  • Cardiology (AREA)
  • General Health & Medical Sciences (AREA)
  • Synchronisation In Digital Transmission Systems (AREA)
  • Data Exchanges In Wide-Area Networks (AREA)

Abstract

L'invention se rapporte à un procédé et un système d'écriture, de synchronisation et d'analyse de données transmises entre des appareils spatialement répartis (56, 78, 80, 58) d'un réseau de communication (60, 62) tel qu'un réseau Ethernet en temps réel, au moyen d'appareils d'analyse (72, 88) répartis spatialement, comprenant la réception des données par au moins deux dispositifs d'analyse (72, 88) raccordés au réseau de communication (60, 62), et le marquage des données reçues au moyen d'un signal de synchronisation reçu simultanément par les appareils d'analyse (72, 88). Afin de simplifier l'enregistrement, la synchronisation et l'analyse de données par des appareils d'analyse répartis spatialement, il est prévu que les appareils d'analyse (72, 88) stockent des trames des données reçues dans des fichiers de données, chaque trame de données reçues étant marquée d'une estampille temporelle du temps local de l'appareil d'analyse récepteur (72, 88), et des événements de synchronisation temporelle étant générés dans chaque appareil d'analyse (72, 88) au moyen du signal de synchronisation reçu, lesdits événements de synchronisation étant insérés simultanément entre les trames de données reçues lors du marquage des fichiers de données, sous forme de pseudo-trames (110, 112, 114), dans chaque appareil d'analyse (71, 88), en vue d'une synchronisation ultérieure, qu'une comparaison de l'estampille temporelle locale contenue dans les trames de données avec les événements de synchronisation temporelle insérés soit effectuée, qu'une information spécifique de l'appareil d'analyse correspondant soit codée dans chaque trame de données, et que lors de la mesure des fichiers de données individuels reçus par les appareils d'analyse particuliers soient associés aux événements de synchronisation temporelle de telle manière que les trames de données enregistrées par l'appareil d'analyse se présentent dans un ordre temporel correct.
EP11766970.5A 2010-09-30 2011-09-30 Procédé et système d'enregistrement, de synchronisation et d'analyse de données au moyen d'appareils d'analyse répartis spatialement dans un réseau de communication Withdrawn EP2622798A2 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102010037906.9A DE102010037906B4 (de) 2010-09-30 2010-09-30 Verfahren und System zur Aufzeichnung, Synchronisation und Analyse von Daten mittels in einem Kommunikationsnetzwerk räumlich verteilter Analyse-Geräte
PCT/EP2011/067103 WO2012042017A2 (fr) 2010-09-30 2011-09-30 Procédé et système d'enregistrement, de synchronisation et d'analyse de données au moyen d'appareils d'analyse répartis spatialement dans un réseau de communication

Publications (1)

Publication Number Publication Date
EP2622798A2 true EP2622798A2 (fr) 2013-08-07

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ID=44764139

Family Applications (1)

Application Number Title Priority Date Filing Date
EP11766970.5A Withdrawn EP2622798A2 (fr) 2010-09-30 2011-09-30 Procédé et système d'enregistrement, de synchronisation et d'analyse de données au moyen d'appareils d'analyse répartis spatialement dans un réseau de communication

Country Status (4)

Country Link
US (1) US9031055B2 (fr)
EP (1) EP2622798A2 (fr)
DE (1) DE102010037906B4 (fr)
WO (1) WO2012042017A2 (fr)

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EP3337099A1 (fr) 2016-12-13 2018-06-20 Napatech A/S Système et procédé de gestion de données
CN115023180A (zh) 2019-10-01 2022-09-06 丽娃健康公司 用于确定心血管参数的方法和系统
CN111257026B (zh) * 2020-02-21 2021-09-21 清华大学 空调器的在线性能测量方法、系统、设备及存储介质
WO2022187746A1 (fr) 2021-03-05 2022-09-09 Riva Health, Inc. Système et procédé de validation de moniteurs de paramètres cardiovasculaires
US11830624B2 (en) 2021-09-07 2023-11-28 Riva Health, Inc. System and method for determining data quality for cardiovascular parameter determination

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Also Published As

Publication number Publication date
US20140003454A1 (en) 2014-01-02
WO2012042017A2 (fr) 2012-04-05
DE102010037906A1 (de) 2012-04-05
WO2012042017A3 (fr) 2013-07-04
DE102010037906B4 (de) 2014-02-27
US9031055B2 (en) 2015-05-12

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