DE212016000195U1 - On-board media device for rail vehicles - Google Patents

Abstract

On-board media device of the rail vehicle, characterized in that said device is equipped with a media server, a client application software and a client for dynamic matching, provided that the media server with the client application software and with the client for the dynamic Matching, which can periodically check the network connection parameters and initiate the start of downloading data from the central server according to the list corresponding to its identity assigned by the media server, and the dynamic reconciliation client sends statistics data to the central server while the client application software can provide information to users.

Description

The present utility model relates to the field of rail transport, especially the multimedia vehicles, and may be used to solve the problem of transmitting entertainment content to passengers while the train is moving. This utility model can also be used for other types of traffic and in other areas.

There is known a multi-function on-board media system of a railway passenger car which includes a plurality of line communication lines and a multi-service network controller (MNC) designed as an unattended computer which, together with the units for connection to the external telecommunications network in a protective housing is used, and characterized in that the multi-service network controller is a multi-functional on-board media device for providing media services; wherein said unattended computer is implemented as a Field Replaceable Unit (FRU) inserted as a mobile / portable box in a protective housing ( RU Patent No. 139510 , MΠK B60R 11/02, 03.06.2013).

There is known a multi-function on-board media system for passenger railcars, said system comprising a base station housed in a company car and connected by a digital wireless link, such as a satellite radio channel, to the external telecommunications systems, video monitors located in each car, and the base station connected communication terminals comprises ( RU Patent No. 53988 U1 , MΠK B60R 11/02, G08B 13/196, H04N 7/18, 01.02.2006). The base station includes a train information server, a mail and Internet server, a video control system server, information server and video control system server monitors, a control panel, and power supply units. The train server is connected to a GPS transmitter. In each coaches of the train at least one multiplexer connected to a segment of a local area network (LAN) providing the transmission of digital audio and video signals to each passenger terminal located in the car, a wireless access device to the train network for connection is more portable Computer and a video controller, which is connected to the video control system server of the base station and video cameras, car recorders and power supply units accommodated housed. In at least one passenger coach, a car LAN server is installed, which ensures the broadcast of "video-on-demand".

There is known a multi-function on-board media system for passenger railcars, characterized in that the multi-function onboard media system in railway passenger cars has a security system, car-mounted units for connection to external communication networks, passenger seat communication terminals in the car and a power supply unit. This system includes a multi-service network controller in the form of an unattended computer inserted in a protective housing connected to a security system, units for connection to external communication networks, passenger seat communication terminals in the car and a power supply unit. In addition, the following may be additionally installed: a system for the protection of objects from theft from the wagon, RFID sensors connected to the multi-service network controller, a system for measuring human body temperature, the thermal imaging camera of this system being equipped with the multi-service network controller. Service network controller is connected ( RU Patent No. 90390 U1 , MΠK B60R 11/02, 01.10.2009). The passenger seat communication terminals in the car may be implemented as a distribution box with connectors for connecting Internet, headsets, video, power supply and train attendant call button. The security system may include a video surveillance camera and smoke, motion and vibration detectors and "electronic nose" type sensors for the detection of substances that are prohibited from being transported. The units for connection to the external communication networks may be implemented as GPS receivers, GSM modem multi-SIM for communication with the mobile telephone networks and an adapter for wireless communication between cars, in addition there may additionally be an IP payment system. Card phone, which is connected to the multi-service network controller and a terminal for payment of services by means of credit cards, with respective controllers.

The disadvantage of the above-mentioned systems is their multi-functionality and the use of a single device to immediately solve the entire range of problems that arise in the course of providing services to passengers. Due to the overloading of this device with various interfaces and various software (SW) it becomes very complicated, difficult to control and potentially unreliable.

The technical problem resides in the development of an on-board media device that provides passengers with infotainment services along with a capability to periodically inventory the content (data) and software corresponding to the identity of the on-board device, and one Ability to transfer statistics to the central server.

• 1 ist eine Abbildung der Zusammensetzung der grundlegenden Komponenten des Systems des Multimedia-Infotainment-Portals.
• 2 zeigt die Komponenten der Onboard-Medienvorrichtung (Onboard-Server).
• 3 veranschaulicht die Komponenten des Steuersystems.

The technical result consists of the expansion of the technical means and functional possibilities of the on-board media device with the above-mentioned functions.

• 1 is an illustration of the composition of the basic components of the multimedia infotainment portal system.
• 2 shows the components of the onboard media device (onboard server).
• 3 illustrates the components of the control system.

The Multimedia Infotainment Portal includes the Dynamic Matching Service ( 1 ) and the tax system ( 2 ), which is a content control unit ( 3 ) and a server for dynamic synchronization ( 4 ) with the content control system ( 3 ).

The technical result is achieved by the fact that the on-board media device ( 5 ) of the rail vehicle with a media server ( 6 ), an on-board application software ( 7 ) and a dynamic onboard synchronization ( 8th ), provided that the media server ( 6 ) with the client application software ( 7 ) and with the client for dynamic reconciliation ( 8th ), which is capable of periodically checking the network connection parameters, and has the ability to start the download of data from the central server according to the list corresponding to its identity from the media server ( 6 In addition, the client is designed for dynamic matching with the ability to transmit statistics to the central server, provided that the client application software can communicate information to the users.

In addition, the dynamic reconciliation client can load the data according to the protocol, which only transfers new files and only those parts of old files that have been replaced.

The on-board media device ( 5 ) is installed directly in the rail vehicle and performs a direct interaction with customer devices. Said device is an unattended computer which is inserted in a protective housing. On the client side, the software (SW) of the onboard media device is intended to be used both in browsers in customer devices and in a special application specially developed for display in the portal.

The tax system ( 2 ) is installed in a data processing center (DPC) on the floor and can be realized in a cloud infrastructure for better accessibility. The above system solves the problem of controlling content, updating the SW of on-board devices, statistics collection, and reporting based on the aforementioned statistical data. The system has a web interface that enables the creation and loading of content, the introduction of accompanying metadata, the merging of content into sentences, its publication for sub-sets of on-board media devices, revision, and viewing reports.

The service for dynamic reconciliation ( 1 ) is a distributed service, has bottom-side and on-board components ( 4 . 8th ) and solves a problem of data exchange between the on-board media devices ( 5 ) and the tax system ( 2 ). It is designed for use under conditions of intermittent, long-term interrupted communication between the ground and onboard components. In order to improve its efficiency, the bottom-side components of the service ( 4 ) outside the tax system ( 2 ) are installed. For example, in an operating station where a high-speed wireless local area network can be organized to balance large sets of contents during maintenance of the rail vehicle. If required, the content may also be transferred to the onboard media devices via removable storage devices ( 5 ) to be delivered. For this purpose, the tax system ( 2 ) for content uploading possible on a removable storage device. The client for dynamic reconciliation ( 8th ) cyclically retrieves external storage devices connected to the on-board media device ( 5 ) and starts the update process if a synchronization job is available in the storage device.

• - Abgabe des Portal-Inhalts, nämlich Menü/Navigation (22), Video (23), Audio (24) und E-Bücher (25), an Kundenvorrichtungen (9);
• - in der Abgleicheinheit (11) Synchronisierung der Portal-Inhalts-Daten, nämlich E-Buch- (17), Audio- (18) und Video- (19) -dateien, mit dem Steuersystem;
• - Aktualisierung der SW-Komponenten (6, 7 und 8) der Onboard-Medienvorrichtung (5) in den SW-Aktualisierungseinheiten (12, 15);
• - Übergabe von Statistiken der Ressourcennutzung in der Einheit (10) an das Steuersystem.

The onboard media device (onboard server) ( 5 ) is installed in the rail vehicle ( 2 ). Its task is to perform the following functions:

• - Submission of portal content, namely menu / navigation ( 22 ), Video ( 23 ), Audio ( 24 ) and e-books ( 25 ), to customer devices ( 9 );
• - in the matching unit ( 11 ) Synchronization of portal content data, namely e-book ( 17 ), Audio ( 18 ) and video ( 19 ) files, with the control system;
• - Updating the SW components ( 6 . 7 and 8th ) of the on-board media device ( 5 ) in the SW update units ( 12 . 15 );
• - Transfer of statistics of resource use in the unit ( 10 ) to the tax system.

• - einen Medienserver (6);
• - eine Client-Anwendungssoftware (7) auf Basis von HTML5;
• - einen Client für den dynamischen Abgleich (8).

The architecture of the onboard media device ( 5 ) comprises the following main components ( 2 );

• - a media server ( 6 );
• a client application software ( 7 ) based on HTML5;
• - a client for dynamic reconciliation ( 8th ).

• - die Lieferung von Portal-Inhalt an Endkunden wird mittels einer Client-Anwendungssoftware (7) auf Basis von HTML5 durchgeführt;
• - den Abgleich des Portals mit dem Steuersystem, die SW-Aktualisierung und die Lieferung von Statistiken werden vom Client für den dynamischen Abgleich (8) durchgeführt.

Onboard Media Device Features ( 5 ) are distributed among these components as follows:

• - the delivery of portal content to end customers is performed by means of client application software ( 7 ) based on HTML5;
• - the adjustment of the portal with the control system, the SW update and the delivery of statistics are performed by the client for dynamic reconciliation ( 8th ) carried out.

The media server ( 6 ) is designed to perform low-level storage, control, content rights distribution, statistics collection, authentication, and user authorization. He presents REST API for collaboration with onboard applications ( 7 ) and performs the streaming of audio (18) and video ( 19 ) files. He also has a mechanism to send a message about the work status of the onboard media device ( 5 ) to the tax system ( 2 ), User authorization mechanisms ( 16 ) and a payment gateway.

When the dynamic reconciliation client ( 8th ) in online operation of the server for dynamic synchronization ( 4 ) and in offline operation of the removable storage device in the SW block ( 12 ) an update job or in the content block ( 11 ) detects a match, said client automatically begins downloading the required files to the storage device of the on-board media device ( 5 ).

In the course of the SW update, the update of the SW components is terminated, new versions are installed, and in the case of a successful completion of the installation, the SW is changed to the new version. The number of current versions of the SW components in the respective unit ( 15 ) of the media server ( 6 ) saved. Each SW component ( 6 . 7 and 8th ) of the onboard media device can be updated separately.

The comparison in the content block ( 11 ) can be performed without the portal interruption, ie user-transparent. During content reconciliation, new files are placed in a separate folder in the storage device of the on-board media device ( 5 ). The availability of each file ( 17 . 18 and 19 ) in the current version of the content and their checksum compared with the file of the new content version to match. If there is a match, the file of the new content set will not be transferred. If the file is still transferred to the on-board media device, the checksum of the downloaded file will be checked after the download completes. This allows the update time to be minimized during minor content changes and protects the information from corruption in the event of a memory device error in the on-board media device or a transmission error. Upon successful completion of loading the new content, the information about it is transferred to the database (DB) ( 14 ) of the media server ( 6 ) and the onboard media device is switched to the new content version. In the case of a reconciliation process error, the migration does not occur and the content remains accessible to users in the old version. If necessary, for. For example, if false content is found, it will be able to roll back to the previous version of the content after successful synchronization.

The DB ( 14 ) serves to provide the information about the content of the portal pages to the client application SW ( 7 ). The named DB contains the data about different content types ( 17 . 18 . 19 ) when a request is received from the client application software ( 7 ) a catalog format ( 20 ) that can be easily assigned to the client device (using the HTTP protocol). 9 ). In addition to the information about the location of the respective files, the DB ( 14 ) various metadata (for example, in the case of video content ( 19 ) the information about genre, director, actor, description of the plot, etc.) as well as the time within which the respective content unit is accessible to the users. This allows for an accurate follow-up of the agreements signed by the rightholders. When the on-board media device is in operation, the information from the DB ( 14 ), which are in catalog format ( 20 ) have been converted by the client application software in the form of menu / navigation ( 22 ), Video- ( 23 ), Audio (24) and e-book ( 25 ) Files to the client devices ( 9 ) delivered.

After connecting to the portal, each client device ( 9 ) a unique identifier related to both the physical parameters of the device and the method of connection. This is done by means of the authentication module ( 21 ) of the client application software ( 7 ) using the authentication and authorization module ( 16 ) of the media server ( 6 ). When the customer buys paid content, his payment status is related to his identifier. The information mentioned is encrypted in the server saved. Upon request by the content user, the client application software media server presents only the content units to which the user has access depending on the status of his class of service, payment, and current date: Menu / Navigation ( 22 ), Video ( 23 ), Audio ( 24 ) and e-books ( 25 ).

During the operation of the on-board media device, the client application software detects in the statistics delivery block ( 26 ) constantly different statistics. These include the information required for rightsholder reports, such as the number of clients attached at a specific time, the number of views of each content unit, the onboard device connection quality, etc. These statistics are sent to the statistics collection engine ( 13 ) of the media server. When the connection with the control system ( 2 ), statistics takeover using the Dynamic Matching Client ( 8th ) in the unit ( 10 ) instead of.

• - Benutzerauthentifizierung (21);
• - Anzeigen von Streaming-Video (23);
• - Wiedergabe von Audio-Dateien (24);
• - Starten von PDF im Anzeigestandardprogramm des Client-OS (25);
• - Möglichkeit der Anzeige der Bezahlseite des Dienstes mittels eines Zahlungs-Gateways des Medienservers;
• - Möglichkeit der Einbindung externer Komponenten in die Anwendungsschnittstelle mittels iframe.

The HTML5-based client application software ( 7 ) is built using the REST architecture and runs in the web browsers of mobile devices running OS, iOS and Android and in the browsers IE, Safari, Chrome, Firefox of desktop OS like MacOS, Windows, Linux. The application performs the following functions:

• - user authentication ( 21 );
• - View streaming video ( 23 );
• - playback of audio files ( 24 );
• - Starting PDF in the display standard program of the client OS ( 25 );
• Possibility of displaying the payment page of the service by means of a payment gateway of the media server;
• - Possibility of integrating external components in the application interface by means of iframe.

When the client enters the portal, the required application components are downloaded to its device in JavaScript format and then executed in the browser. During the information exchange with the on-board device ( 9 ), all interactions in the unit ( 26 ) and stored to send the statistics to the central server in the onboard media device.

The equipment for the on-board media device ( 5 ) - Software is selected independently for each installer. Design type, form factor, mounting style are determined according to the conditions prevailing on the device. For the successful functioning of the portal, said equipment must meet certain requirements from the software to the specifications of the processor, the available RAM and the storage device.

The on-board media device ( 5 ) can be operated in autonomous operation, ie without an internet connection. During normal operation, the network connection is expected to be available, but this is not necessarily the case. In the case of connection availability, the on-board media device may perform some interaction with the central server, such as: For example, the content, software update, and sending the statistics information to the control system ( 2 ).

• - Inhalts-Steuersystem (3);
• - Server für den dynamischen Abgleich (4);
• - DB (Datenbank) für Inhalte, Metadaten, SW, Statistiken (33).

The tax system ( 2 ) comprises three main modules ( 3 ):

• Content Control System ( 3 );
• - Server for dynamic synchronization ( 4 );
• - DB (database) for content, metadata, SW, statistics ( 33 ).

The content control system ( 3 ) makes adding video ( 19 , please refer 2 ), Audio ( 18 , please refer 2 ) Files and PDF files ( 17 , please refer 2 ), Drawings to them and text files with metadata for the description of the added content.

• - Einfügen neuer Mediendateien (mp3, mp4, pdf) (17, 18, 19, siehe 2) in die DB (33) für Inhalt, Metadaten, SW, Statistiken zum Hinzufügen neuer Mediendateien;
• - Bearbeiten (28) ihrer Beschreibung;
• - Verankern der Medien-Inhalte- am Inhalte-Satz;
• - Veröffentlichen des Inhalte-Satzes für gewisse Onboard-Medienvorrichtungen (5) im Block Veröffentlichung (32);
• - Bearbeiten (29) der erforderlichen Regeln des Anzeigens des Medien-Inhalts für Passagiere durch Zuweisen von Kategorien;
• - Bearbeiten der Liste von Onboard-Medienvorrichtungen (5);
• - Bearbeiten der Liste von SW-Versionen für Onboard-Medienvorrichtungen (5) im Block Listensteuerung und -bearbeitung (31);
• - Veröffentlichen der SW-Aktualisierungen für Onboard-Medienvorrichtungen (5) im Block Veröffentlichung (32);
• - Verwalten von Bildern (30);
• - Anzeigen der Statistiken der Inhalte-Nutzung durch Passagiere, Statistiken des Betriebs des Dienstes für den dynamischen Abgleich (1) mithilfe der Einheit (27) zum Analysieren und Anzeigen der Nutzungsstatistiken aller Onboard-Medienvorrichtungen (5).

The system administrator can provide:

• - Insert new media files (mp3, mp4, pdf) ( 17 . 18 . 19 , please refer 2 ) into the DB ( 33 ) for content, metadata, SW, statistics for adding new media files;
• - To edit ( 28 ) of their description;
• - anchoring the media contents - at the content set;
• Publish the content set for certain on-board media devices ( 5 ) in the block publication ( 32 );
• - To edit ( 29 ) the required rules of displaying the media content for passengers by assigning categories;
• Edit the list of on-board media devices ( 5 );
• - Editing the list of SW versions for on-board media devices ( 5 ) in the list control and processing block ( 31 );
• - Publish SW updates for on-board media devices ( 5 ) in the block publication ( 32 );
• - Managing pictures ( 30 );
• - Display of statistics of content usage by passengers, statistics of operation of service of dynamic comparison ( 1 ) using the unit ( 27 ) for analyzing and displaying the usage statistics of all on-board media devices ( 5 ).

Anyone with an onboard media device ( 5 ) equipped train has in the tax system ( 2 ) a unique identifier. The named identifier is in the configuration file of the media server ( 6 ) recorded. Trains can work with two or more instances of the media server ( 6 ) to provide the service of all passengers. Such instances have unique group identifiers for concurrent publication of the content set on all media servers ( 6 ) the group. The tax system ( 2 ) allows editing the list of all instances of onboard media devices ( 5 ) and their groups and the possibility of anchoring the named entities and groups in the sets of published content ( 34 ). The system administrator can check the current state of the network connection of each onboard media device ( 5 ) Show. For this purpose, the media server ( 6 ) periodically send service messages to the control system ( 2 ) when connected to the Internet.

The tax system ( 2 ) allows editing ( 29 ) of the data categories and referencing the media with the mentioned categories. As a category example, video genre, video teasers for video presentation in the explanation and advertising block, etc. can be used. The client application software ( 7 ) can filter the media content presentation based on the categories assigned to it.

• - Erste Klasse;
• - Business Class;
• - Economy Class;
• - Touristenklasse.

The tax system ( 2 ) allows the use restriction of certain content elements for certain passenger classes as follows:

• - First class;
• - Business Class;
• - Economy Class;
• - Tourist class.

The tax system ( 2 ) provides for adding and editing the content set and makes the media anchoring possible at certain rates. The publication of the content sentences in the block Publication ( 32 ) is executed separately from the other sentences. The respective set can be used both for the limited set of on-board media devices ( 5 ) in trains as well as all stations configured in the system.

The entire content described in the published sentence is described in the task list for the Dynamic Matching service; The list below contains the instructions for copying the contents with metadata.

Similar to publishing the content updates, the control system sees the list of SW versions in the list control and manipulation unit ( 31 ) in the on-board media devices ( 5 ) and publishing the selected version on the respective trains. During the release of the selected version, the control system ( 2 ) copying a package with the required SW version and the update script to be started in the onboard media device by the matching service.

The tax system ( 2 ) integrates performance reports of the comparison service ( 1 ) and indicates the current state of the download to the respective instance of the onboard media device. The system ( 2 ) also makes it possible to control the content, capture the content used, keep the statistics and interact with any payment system.

• - die Anzahl der Wiedergaben der Video-/Audiodateien;
• - die ausgewählte Anzahl von Wiedergaben;
• - Informationen über die Tatsache der Zahlungsleistung und des Zugangs zum Medien-Inhalt;
• - Informationen über Fehler im Systemverhalten;
• - Berichte über die Durchführung des Dateienabgleichs.

The system provides a means of statistical analysis using the unit ( 27 ) for analyzing and displaying the statistics collected in all subsystems. The statistics include the following:

• - the number of playbacks of the video / audio files;
• the selected number of renderings;
• - information about the fact of payment and access to media content;
• - Information about errors in the system behavior;
• - Reports about the execution of the file synchronization.

The tax system ( 2 ) allows visual presentation of the reports using bar charts with the ability to filter them according to time slots.

Loading content into the block Publication and SW ( 34 ) is executed through the web interface of the control system or through the ftp server, depending on whether it is loaded by the content owner or downloaded directly from the remote owner. Each time the file is loaded, the file enters the DB ( 33 ) of the control system and is described in the system using the web interface. After pressing the publish button, the content sentence or SW becomes a media file set ( 35 ) or an archive file set ( 36 ) of the SW installation program accompanied by a file with instructions in a special format from the DB ( 33 ) to the server for dynamic synchronization ( 4 ) transfer.

On-board media devices ( 5 ) with the tax system ( 2 ) receive the set of published allocations of the media file set ( 35 ) or the archive file set ( 36 ) and begin downloading those of them assigned to the respective on-board media device. At the same time, the statistics stored in a time of the communication failure and 27 ) into the database ( 33 be loaded in block ( 37 ), Loading statistics of onboard servers downloaded from the onboard media devices to the control system.

The dynamic matching service ( 1 ) provides communication between on-board media devices ( 5 ) and tax system ( 2 ) ready. This service transmits the updated content and SW in the time periods when the on-board media device (FIG. 5 ) is connected to the internet.

• - dem Server für den dynamischen Abgleich (4) im Steuersystem;
• - dem Client für den dynamischen Abgleich (8) in den Onboard-Medienvorrichtungen.

The service for dynamic reconciliation ( 1 ) consists of the following two components:

• - the dynamic reconciliation server ( 4 ) in the tax system;
• - the dynamic reconciliation client ( 8th ) in the on-board media devices.

The server for dynamic synchronization ( 4 ) in the tax system ( 2 ) is available with the dynamic reconciliation service ( 1 ) of the tax system ( 2 ) integrated. In the case of availability of published content and copying of the task file in the on-board media device ( 5 ) starts the service for dynamic reconciliation ( 1 ) with copying the files into remote server of the trains.

• - Identitäten und/oder Identitätsgruppen der Server, in die der Inhalte-Satz kopiert werden soll;
• - die Liste der Inhalte-Dateien aus dem Inhalte-Satz mit Pfadnamen;
• - die Liste der Metadatendateien zum Inhalt (JSON);
• - die Liste von Illustrationen zum Inhalt in allen erforderlichen Formaten.

The task file describes the following:

• Identities and / or identity groups of the servers into which the content set is to be copied;
• - the list of content files from the content set with pathnames;
• - the list of metadata files for content (JSON);
• - The list of illustrations to the content in all required formats.

The copy of the client for dynamic reconciliation ( 8th ) is also present at each instance of the on-board media device ( 5 ) appropriate. When network connections from Wi-Fi, 3G, etc. are available, the on-board media device ( 5 ) keeping the list that corresponds to their identity, a record from the tax system ( 2 ) down.

The client for dynamic reconciliation ( 8th ) in the on-board media device ( 5 ) periodically checks the network connection parameters and attempts to start copying from the control system ( 2 ). Upon receipt of the task file, said file will start copying all the files from the cloud storage in compliance with the above list. The solution is based on the rsync protocol, which allows the optimization of the volume of data transferred, transferring only new files and only those parts of old files that have undergone modification. Each match is used to check the match of the checksum in the on-board media device ( 5 files containing the checksums of the control system ( 2 ) supplied files.

Thus, an extension of the onboard media device's technical and functional capabilities is provided, namely, designing an on-board media device that provides the passenger infotainment service with the simultaneous capability of periodically updating the content (data) and software its identity and a possibility of transferring statistics.

As data is updated, optimized data loading is also achieved because only new files and only those portions of old files undergoing modification are transferred.

The utility model can be integrated into existing network infrastructure assuming sufficient network throughput. In addition, the application of this utility model is not only tied to rail transport. It is possible to use it also in road and air traffic and isolated stationary facilities.

QUOTES INCLUDE IN THE DESCRIPTION

This list of the documents listed by the applicant has been generated automatically and is included solely for the better information of the reader. The list is not part of the German patent or utility model application. The DPMA assumes no liability for any errors or omissions.

Cited patent literature

• RU 139510 [0002]
• RU 53988 U1 [0003]
• RU 90390 U1 [0004]

Claims (2)

On-board media device of the rail vehicle, characterized in that said device is equipped with a media server, a client application software and a client for dynamic matching, provided that the media server with the client application software and with the client for the dynamic Matching, which can periodically check the network connection parameters and initiate the start of downloading data from the central server according to the list corresponding to its identity assigned by the media server, and the dynamic reconciliation client sends statistics data to the central server while the client application software can provide information to users. Client device after Claim 1 , characterized in that the dynamic reconciliation client may load the data according to protocol, said protocol sending only new files and only those parts of old files that have undergone modification.

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