The Experts below are selected from a list of 1392 Experts worldwide ranked by ideXlab platform

T. Eisaka - One of the best experts on this subject based on the ideXlab platform.

  • Additional switched Ethernet Protocol for industrial hard real-time traffic
    2006
    Co-Authors: A. Yiming, T. Eisaka
    Abstract:

    This paper presents a simple and efficient switched Ethernet communication Protocol for industrial hard real-time LAN applications. The Protocol does not need any modifications in the Ethernet hardware and coexists with TCP/IP suites, therefore, the LAN with the Protocol can be connected to any existing Ethernet networks and support both real-time traffic and best-effort traffic. Compared to some conventional hard real-time network Protocols, the proposed one has better real-time performances, and meets the requirements of reliability for hard real-time system applications.

  • A SWITCHED Ethernet Protocol FOR HARD REAL-TIME EMBEDDED SYSTEM APPLICATIONS
    Journal of Interconnection Networks, 2005
    Co-Authors: A. Yiming, T. Eisaka
    Abstract:

    This paper presents a Protocol to support hard real-time traffic of end-to-end communication over non real-time LAN technology. The network is set up with nodes and switches, and real-time communication is handled by software (Protocol) added between the Ethernet Protocols and the TCP/IP suite. The proposed Protocol establishes a virtual circuit based on admission control and manages hard real-time traffic to bypass the TCP/IP stack. This makes considerably reduce the dwell time in the nodes, and increase the achievable data frame rate. After the bypassing, traffic schedule is performed according to dynamic-priority EDF algorithm. The work does not need any modifications in the Ethernet hardware and coexists with TCP/IP suites, and then the LAN with the Protocol can be connected to any existing Ethernet networks. It can be adopted in industrial hard real-time applications such as embedded systems, distributed control systems, parallel signal processing and robotics. We have performed some experiments to evaluate the Protocol. Compared to some conventional hard real-time network Protocols, the proposed one has better real-time performances and meets the requirements of reliability for hard real-time systems.

  • Notice of Violation of IEEE Publication Principles: An Ethernet Protocol for real-time communications
    SICE 2004 Annual Conference, 2004
    Co-Authors: A. Yiming, T. Eisaka
    Abstract:

    This paper provided a method to support traffic with industrial real-time applications over non-real-time LAN technology, without loss of generality to use common Protocol suits like TCP/IP. In addition, real-time Ethernet communication can be extended with some support for real-time communication over a shared-medium topology, which does not require any modification to existing Ethernet hardware.

  • Development of an Ethernet Protocol for industrial real-time communications
    IEEE International Symposium on Communications and Information Technology 2004. ISCIT 2004., 2004
    Co-Authors: A. Yiming, T. Eisaka
    Abstract:

    This paper provides an Ethernet Protocol to support traffic with industrial real-time applications over non-real-time LAN technology, without loss of generality to use common Protocol suites like TCP/IP. Real-time communication is handled in the nodes and the switch, by software added between the network layer and the data link layer. Support for real-time communication is made by dynamically setting up real-time channels.

  • An Ethernet Protocol for real-time communications
    2004
    Co-Authors: A. Yiming, T. Eisaka
    Abstract:

    Thk paper provided LI method to support trafic with industrial real-fime applications over non-real-time LAN technology, without Ioss of generulify fo use common profocol suits like TCP/!P. In uddition, real-fime Ethemet communication can be extended with some suppo~? for real-time communication over CI shared-medium tOpdOgY, which does not require any mod$cation to existing Ethemet hardware.

A. Yiming - One of the best experts on this subject based on the ideXlab platform.

  • Additional switched Ethernet Protocol for industrial hard real-time traffic
    2006
    Co-Authors: A. Yiming, T. Eisaka
    Abstract:

    This paper presents a simple and efficient switched Ethernet communication Protocol for industrial hard real-time LAN applications. The Protocol does not need any modifications in the Ethernet hardware and coexists with TCP/IP suites, therefore, the LAN with the Protocol can be connected to any existing Ethernet networks and support both real-time traffic and best-effort traffic. Compared to some conventional hard real-time network Protocols, the proposed one has better real-time performances, and meets the requirements of reliability for hard real-time system applications.

  • A SWITCHED Ethernet Protocol FOR HARD REAL-TIME EMBEDDED SYSTEM APPLICATIONS
    Journal of Interconnection Networks, 2005
    Co-Authors: A. Yiming, T. Eisaka
    Abstract:

    This paper presents a Protocol to support hard real-time traffic of end-to-end communication over non real-time LAN technology. The network is set up with nodes and switches, and real-time communication is handled by software (Protocol) added between the Ethernet Protocols and the TCP/IP suite. The proposed Protocol establishes a virtual circuit based on admission control and manages hard real-time traffic to bypass the TCP/IP stack. This makes considerably reduce the dwell time in the nodes, and increase the achievable data frame rate. After the bypassing, traffic schedule is performed according to dynamic-priority EDF algorithm. The work does not need any modifications in the Ethernet hardware and coexists with TCP/IP suites, and then the LAN with the Protocol can be connected to any existing Ethernet networks. It can be adopted in industrial hard real-time applications such as embedded systems, distributed control systems, parallel signal processing and robotics. We have performed some experiments to evaluate the Protocol. Compared to some conventional hard real-time network Protocols, the proposed one has better real-time performances and meets the requirements of reliability for hard real-time systems.

  • Notice of Violation of IEEE Publication Principles: An Ethernet Protocol for real-time communications
    SICE 2004 Annual Conference, 2004
    Co-Authors: A. Yiming, T. Eisaka
    Abstract:

    This paper provided a method to support traffic with industrial real-time applications over non-real-time LAN technology, without loss of generality to use common Protocol suits like TCP/IP. In addition, real-time Ethernet communication can be extended with some support for real-time communication over a shared-medium topology, which does not require any modification to existing Ethernet hardware.

  • Development of an Ethernet Protocol for industrial real-time communications
    IEEE International Symposium on Communications and Information Technology 2004. ISCIT 2004., 2004
    Co-Authors: A. Yiming, T. Eisaka
    Abstract:

    This paper provides an Ethernet Protocol to support traffic with industrial real-time applications over non-real-time LAN technology, without loss of generality to use common Protocol suites like TCP/IP. Real-time communication is handled in the nodes and the switch, by software added between the network layer and the data link layer. Support for real-time communication is made by dynamically setting up real-time channels.

  • An Ethernet Protocol for real-time communications
    2004
    Co-Authors: A. Yiming, T. Eisaka
    Abstract:

    Thk paper provided LI method to support trafic with industrial real-fime applications over non-real-time LAN technology, without Ioss of generulify fo use common profocol suits like TCP/!P. In uddition, real-fime Ethemet communication can be extended with some suppo~? for real-time communication over CI shared-medium tOpdOgY, which does not require any mod$cation to existing Ethemet hardware.

Teng Lin - One of the best experts on this subject based on the ideXlab platform.

  • Feasibility Research on Integration of Power Frequency Synchronization Network With Time Synchronization Network
    Power system technology, 2015
    Co-Authors: Teng Lin
    Abstract:

    To meet the demands of power grid on time and frequency synchronization performances and to change the present situation that the running of power time synchronization is independent from that of power frequency synchronization, the similarities of clock sources, node layout and networking modes between power frequency synchronization network and power time synchronization network are analyzed and the feasible conditions of the integration of the two networks are pointed out, and then a scheme of transmitting the time synchronization signal by the 2M channel for power frequency network is proposed, in which the PTP technique and E1/Ethernet Protocol conversion technique are utilized. A PTP technique based clock skew algorithm, which transmits time synchronization signal between master clock and slave clock, and the format conversion principle of PTP data packet via E1/Ethernet Protocol converter are researched. During the format conversion the delay recording module is utilized to record the time difference for the Protocol conversion to implement automatic delay compensation for conversion of E1 Protocol and Ethernet Protocol. Finally, Based on SDH network a simulation platform for the integration of the frequency synchronization network with the time synchronization network is constructed, and the measurement results show that transmitting the time synchronization signal by the integrated network the time accuracy can reach the nanosecond precision, thus the demand of power business on time accuracy in the grade of microsecond can be satisfied, and it is also proved that the integration of the frequency synchronization network with the time synchronization network is feasible.

Paulo Pedreiras - One of the best experts on this subject based on the ideXlab platform.

  • ftt Ethernet a flexible real time communication Protocol that supports dynamic qos management on Ethernet based systems
    IEEE Transactions on Industrial Informatics, 2005
    Co-Authors: Paulo Pedreiras, Luis Almeida, Giorgio Buttazzo
    Abstract:

    Ethernet was not originally developed to meet the requirements of real-time industrial automation systems and it was commonly considered unsuited for applications at the field level. Hence, several techniques were developed to make this Protocol exhibit real-time behavior, some of them requiring specialized hardware, others providing soft-real-time guarantees only, or others achieving hard real-time guarantees with different levels of bandwidth efficiency. More recently, there has been an effort to support quality-of-service (QoS) negotiation and enforcement but there is not yet an Ethernet-based data link Protocol capable of providing dynamic QoS management to further exploit the variable requirements of dynamic applications. This paper presents the FTT-Ethernet Protocol, which efficiently supports hard-real-time operation in a flexible way, seamlessly over shared or switched Ethernet. The FTT-Ethernet Protocol employs an efficient master/multislave transmission control technique and combines online scheduling with online admission control, to guarantee continued real-time operation under dynamic communication requirements, together with data structures and mechanisms that are tailored to support dynamic QoS management. The paper includes a sample application, aiming at the management of video streams, which highlights the Protocol's ability to support dynamic QoS management with real-time guarantees.

  • the ftt Ethernet Protocol merging flexibility timeliness and efficiency
    Euromicro Conference on Real-Time Systems, 2002
    Co-Authors: Paulo Pedreiras, Luis Almeida
    Abstract:

    Despite having been designed to interconnect office equipment such as computers and printers, since its early daysEthernet has also been considered for use in the industrial domain. However, it was not originally developed to meet the requirements of real-time industrial automation systems and it was commonly considered unsuited for applications at the field level, i.e.to interconnect sensors, actuators and controllers. Therefore, along its 30 years of existence, several proposals have been presented to make this Protocol exhibit real-timebehaviour. Nevertheless, these proposals either require specialised hardware, or are suited to soft-real-time operation only, or are bandwidth or response-time inefficient. This paper presents an overview about the work previously done towards real-time communication on Ethernet. Then, it presents a new Protocol, FTT-Ethernet, which relies on common network adapters and on a new transmission control named master/multi-slave that efficiently supports hard-real-time operation in a flexible way.

  • ECRTS - The FTT-Ethernet Protocol: merging flexibility, timeliness and efficiency
    Proceedings 14th Euromicro Conference on Real-Time Systems. Euromicro RTS 2002, 1
    Co-Authors: Paulo Pedreiras, Luis Almeida, Paolo Gai
    Abstract:

    Despite having been designed to interconnect office equipment such as computers and printers, since its early daysEthernet has also been considered for use in the industrial domain. However, it was not originally developed to meet the requirements of real-time industrial automation systems and it was commonly considered unsuited for applications at the field level, i.e.to interconnect sensors, actuators and controllers. Therefore, along its 30 years of existence, several proposals have been presented to make this Protocol exhibit real-timebehaviour. Nevertheless, these proposals either require specialised hardware, or are suited to soft-real-time operation only, or are bandwidth or response-time inefficient. This paper presents an overview about the work previously done towards real-time communication on Ethernet. Then, it presents a new Protocol, FTT-Ethernet, which relies on common network adapters and on a new transmission control named master/multi-slave that efficiently supports hard-real-time operation in a flexible way.

Michael González Harbour - One of the best experts on this subject based on the ideXlab platform.

  • rt ep a fixed priority real time communication Protocol over standard Ethernet
    International Conference on Reliable Software Technologies, 2005
    Co-Authors: José M. Martínez, Michael González Harbour
    Abstract:

    This paper presents the design and implementation of RT-EP (Real-Time Ethernet Protocol), which is a software-based token-passing Ethernet Protocol for multipoint communications in real-time applications, that does not require any modification to existing Ethernet hardware. The Protocol allows a fixed priority to be assigned to each message, and consequently well-known schedulability analysis techniques can be applied. A precise model of its timing behavior has been obtained. Furthermore, this Protocol provides the ability of recovering from some fault conditions. It has been ported to an implementation of the Minimal Real-Time POSIX standard called MaRTE OS [10], and is being used to support real-time communications in an implementation of Ada’s Distributed Systems Annex (RT-GLADE). It has been successfully used to implement a distributed controlled for an industrial robot.

  • Ada-Europe - RT-EP: a fixed-priority real time communication Protocol over standard Ethernet
    Reliable Software Technology – Ada-Europe 2005, 2005
    Co-Authors: José M. Martínez, Michael González Harbour
    Abstract:

    This paper presents the design and implementation of RT-EP (Real-Time Ethernet Protocol), which is a software-based token-passing Ethernet Protocol for multipoint communications in real-time applications, that does not require any modification to existing Ethernet hardware. The Protocol allows a fixed priority to be assigned to each message, and consequently well-known schedulability analysis techniques can be applied. A precise model of its timing behavior has been obtained. Furthermore, this Protocol provides the ability of recovering from some fault conditions. It has been ported to an implementation of the Minimal Real-Time POSIX standard called MaRTE OS [10], and is being used to support real-time communications in an implementation of Ada’s Distributed Systems Annex (RT-GLADE). It has been successfully used to implement a distributed controlled for an industrial robot.