• Title/Summary/Keyword: Network Synchronization Controller

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A Study on the DP-PLL Controller Design using SOPC for NG-SDH Networks (SOPC를 활용한 NG-SDH 망용 DP-PLL 제어기 설계에 관한 연구)

  • Seon, Gwon-Seok;Park, Min-Sang
    • Journal of the Institute of Convergence Signal Processing
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    • v.15 no.4
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    • pp.169-175
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    • 2014
  • NG-SDH system is connected with networks throughout optical fibers. Network synchronization controller is a necessary for the data synchronization in each optical transmission system. In this paper, we have design and implementation the network synchronization controller using SOPC(system on a programmable chip) design technic. For this network synchronization controller we use FPGA in Altera. FPGA includes 32bit CPU, DPRAM(dual port ram), digital input/output port, transmitter and receiver framer, phase difference detector. We also confirm that designed network synchronization controller satisfies the ITU-T G.813 timing requirements.

Multimedia Conferencing System with Intramedia and Intermedia Synchronization Support

  • Yoo, Sang-Shin;Kim, Duck-Jin
    • Journal of Electrical Engineering and information Science
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    • v.2 no.3
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    • pp.41-50
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    • 1997
  • In this paper, we describe the design, implementation and evaluation for a multimedia conferencing system with intramedia and intermedia synchronization support between audio and video. The synchronization mechanism proposed here is capable of dynamically adapting to various network conditions thus providing an optimized QoS. In realizing the system based on this mechanism, NeVoT on Mbone is used for audio and VIC for video. Furthermore a synchromization controller is designed and realized with a unique process in supporting intermedia synchronization. Each media agents handling its media stream are modified with intramedia synchronization function. And a communicative function between media agents and synchronization controller is added as well for intermedia synchronization function. Each media agents function reports its buffering status to the synchronization control process which in turn send out optimized buffering delay value thus supporting intermedia synchronization. The realized system is configured and tested on Ethernet and ATM network where performance measurements were performed and its effective synchronization support has been assured.

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Implementation of IEEE1588 for Clock Synchronization (CAN 네트워크의 시간동기를 위한 IEEE1588 구현)

  • Park, Sung-Won;Kim, In-Sung;Lee, Dongik
    • The Journal of Korean Institute of Communications and Information Sciences
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    • v.39B no.2
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    • pp.123-132
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    • 2014
  • In this paper, an IEEE1588 based clock synchronization technique for CAN (Controller Area Network) is presented. Clock synchronization plays a key role to the success of a networked embedded system. Recently, the IEEE1588 algorithm making use of dedicated chipsets has been widely adopted for the synchronization of various industrial applications using Ethernet. However, there is no chipset available for CAN. This paper presents the implementation of IEEE1588 for CAN, which is implemented using only software and CAN packets without any dedicated chipset. The proposed approach is verified by the comparison between the estimated synchronization precision with a simple model and the measured precision with experimental setup.

Synchronization Control of Multiple Motors using CAN Clock Synchronization (CAN 시간동기를 이용한 복수 전동기 동기제어)

  • Khoa Do, Le Minh;Suh, Young-Soo
    • Journal of Institute of Control, Robotics and Systems
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    • v.14 no.7
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    • pp.624-628
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    • 2008
  • This paper is concerned with multiple motor control using a distributed network control method. Speed and position of multiple motors are synchronized using clock synchronized distributed controllers. CAN (controller area network) is used and a new clock synchronization algorithm is proposed and implemented. To verify the proposed control algorithm, two disks which are attached on two motor shafts are controlled to rotate at the same speed and phase angle with the same time base using network clocks.

Application of a CAN-Based Feedback Control System to a High-Speed Train Pressurization System (CAN기반 피드백 시스템의 고속전철 여압시스템 적용)

  • 김홍렬;곽권천;김대원
    • Journal of Institute of Control, Robotics and Systems
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    • v.9 no.11
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    • pp.963-968
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    • 2003
  • A feedback control implementation for a high speed train pressurization system is proposed based on CAN (Controller Area Network). Firstly, system model including network latencies by CAN arbitration mechanisms is proposed, and an analytical compensation method of control parameters based on the system model is proposed for the network latencies. For the practical implementation of the control, global synchronization is adopted for controller to measure network latencies and to utilize them for the compensation of the control parameters. Simulation results are shown with practical tunnel data response. The proposed method is evaluated to be the most effective for the system through the control performances comparing among a controller not considering network latencies, other two off-line compensation methods, and the proposed method.

A Study on Tracking Control for Networked Multi-Motor Systems

  • Lee, Hong-Hee;Jung, Eui-Heon
    • 제어로봇시스템학회:학술대회논문집
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    • 2004.08a
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    • pp.1897-1900
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    • 2004
  • In recent years, a lot of industrial equipments have serial communication channel such as FieldBus (CAN, Profibus, etc.) or Ethernet that provides real time communication between industrial equipments. Theses applications include gantry crane, robot, chip mounter, etc.. In this paper, we discuss the synchronization technique for networked multi-motor systems where controllers (commercial servo amps) are distributed and interconnected by CAN (Controller Area Networks). We first describe the equivalent model for the individual servo-amp and motor using the frequency response. We design the $H{\infty}$ controller for motion synchronization. Finally, the synchronization technique using the equivalent model and the $H{\infty}$ controller is verified by the simulation and the experiment.

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The Study on Position Synchronization for Multi-motors using Controller Area Network (CAN을 이용한 복수 전동기의 위치 동기화에 관한 연구)

  • 정의헌
    • Proceedings of the KIPE Conference
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    • 2000.07a
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    • pp.464-467
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    • 2000
  • In this paper we introduce the network based multi-motors control system using CAN(Controller Area Network) The traditional multi-motors control system has many problems in the view of reliability and economy because of the amount and complexity of wiring noise and maintenance problems etc, These problems are serious especially when the motor controllers are separated widely CAN is generally applied in car networking in order to reduce the complexity of the related wiring harnesses. These traditional CAN application techniques are modified to achieve the real time communication for the multi-motor control system. And also the position synchronization technique is developed and the proposed methods are verified experimentally.

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Synchronization of a Complex Dynamical Network with Free Coupling Matrix (자유로운 연결 구조를 갖는 복잡 동적망의 동기화)

  • Lee, Tae-Hee;Park, Ju-H.;Kwon, Oh-Min;Lee, Sang-Moon
    • The Transactions of The Korean Institute of Electrical Engineers
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    • v.60 no.8
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    • pp.1586-1591
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    • 2011
  • This paper considers synchronization problem of a complex dynamical network. For the problem, the virtual target node is chosen as one of nodes in the complex network and only one connection is needed between an isolate target node and virtual target node not any more connections. Moreover, our synchronization scheme does not need additional conditions and information of coupling matrix comparing with existing works. Based on Lyapunov stability theory, a design criterion for a novel adaptive feedback controller for the synchronization between the isolate target node and another nodes of the complex network is proposed. Finally, the proposed method is applied to a numerical example in order to show the effectiveness of our results.

Synchronization of a Complex Dynamical Network with nonidentical Node and Free Coupling Strength (비동일 노드들과 연결정보 제약이 없는 복잡동적 네트워크의 동기화)

  • Yun, Han-O
    • Journal of the Institute of Electronics and Information Engineers
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    • v.50 no.8
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    • pp.292-298
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    • 2013
  • This paper considers synchronization problem of a complex dynamical network with nonidentical nodes. For the problem, the target node is chosen as one of nodes in the complex network instead of an isolate node. Moreover, our synchronization scheme does not need additional conditions and information of coupling matrix comparing with existing works. Based on Lyapunov stability theory, a design criterion for a novel adaptive feedback controller for the synchronization between the target node and another nodes of the complex network is proposed. Finally, the proposed method is applied to a numerical example in orther to show the effectiveness of our results.

An Optimal Design of a TDMA Baseband Modem for Relay Protocol (중계 프로토콜을 위한 TDMA 기저대역 중계모뎀의 최적 설계)

  • Bae, Yongwook;Ahn, Byoungchul
    • Journal of the Institute of Electronics and Information Engineers
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    • v.51 no.6
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    • pp.124-131
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    • 2014
  • This paper describes a design of an adaptive baseband modem based on TDMA(time division multiple access) with a relay protocol function for wireless personal area networks. The designed baseband modem is controlled by a master synchronization signal and can be configured a relay network up to 14 hops. For efficient data relay communications, the internal buffer design is optimized by implementing a priority memory bus controller to a single port memory. And the priority memory bus controller is also designed to minimize the number of synthesized logic gates. To implement the synchronization function of the narrowband TDMA relay communication, the number of gates has been reduced by dividing the frame synchronization circuits and the network slot synchronization circuits. By using these methods, the number of gates are used about 37%(34,000 gates) on Xilinx FPGA XC6SLX9 which has 90,000 gates. For the 1024-bit frame size with a 32-bit synchronization word, the communication reception rate is 96.4%. The measured maximum transmission delay of the designed baseband modem is 230.4 msec for the 14-hop relay communication.