• Title/Summary/Keyword: token bus protocol

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The medium access control protocol of virtual token bus network for real time communication (실시간 통신을 위한 가상토큰버스 통신망의 매체접근제어 프로토콜)

  • 정연괘
    • Journal of the Korean Institute of Telematics and Electronics A
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    • v.33A no.7
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    • pp.76-91
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    • 1996
  • In this paper, we proposed the new medium access control protocol for the virtual token bus netowrk. The network is applied to inter-processor communication network of large capacity digital switching system and digital mobile system with distributed control architecture. in the virtual token bus netowrk, the existing medium access control protocols hav ea switchove rtime overhead when traffic load is light or asymmetric according ot arbitration address of node that has message to send. The proposed protocol optimized average message delay using cyclic bus access chain to exclude switchover time of node that do not have message to send. Therefore it enhanced bus tuilization and average message delay that degrades the performance of real time communication netowrks. It showed that the proposed protocol is more enhacned than virtual token medium access control protocol and virtual token medium access control protocol iwth reservation through performance analysis.

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The implementation of token passing bus protocol for MAP application (MAP 적용을 위한 토큰 패싱 버스 프로토콜의 구현)

  • 이창원;이강익;신기명;김용득
    • 제어로봇시스템학회:학술대회논문집
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    • 1990.10a
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    • pp.741-744
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    • 1990
  • This paper deals with the implementation of the IEEE 802.4 token passing bus protocol which is the world standard for LAN protocol. We are design station adaptor using MC68824 for data link layer, MC68194 for physical layer, and implemented by IEEE 802.4 and 802.2 type 3. We made three station adaptor and its performance is experimented.

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Simulation Study on the Performance of the IEEE 802.4 Token Passing Bus Protocol (IEEE 802.4토큰 패싱 버스 프로토콜의 성능에 관한 시뮬레이션 연구)

  • Lim, Dong-Min;lee, Hwang-Soo;Un, Chong-Kwan
    • Journal of the Korean Institute of Telematics and Electronics
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    • v.26 no.3
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    • pp.22-31
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    • 1989
  • In this paper, we analyze the performance of the IEEE 802.4 token passing bus protocol through a simulation model of the protocol. In order to analyze performance of the protocol in the initialization, transition and fault recovery states as well as in the steady state, the protocol functions are divided into five processes each of which can effectively simulate protocol behaviors according to the variations of protocol parameters. From the simulation study, we obtain protocol parameters which severely influence the protocol performance and find out that proper selection of the protocol parameter values for token passing is very important to obtain good performance of the protocol when the priority scheme is used.

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Tramsmission Method of Periodic and Aperiodic Real-Time Data on a Timer-Controlled Network for Distributed Control Systems (분산제어시스템을 위한 타이머 제어형 통신망의 주기 및 실시간 비주기 데이터 전송 방식)

  • Moon, Hong-ju;Park, Hong-Seong
    • Journal of Institute of Control, Robotics and Systems
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    • v.6 no.7
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    • pp.602-610
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    • 2000
  • In communication networks used in safety-critical systems such as control systems in nuclear power plants there exist three types of data traffic : urgent or asynchronous hard real-time data hard real-time periodic data and soft real-time periodic data. it is necessary to allocate a suitable bandwidth to each data traffic in order to meet their real-time constraints. This paper proposes a method to meet the real-time constraints for the three types of data traffic simultaneously under a timer-controlled token bus protocol or the IEEE 802.4 token bus protocol and verifies the validity of the presented method by an example. This paper derives the proper region of the high priority token hold time and the target token rotation time for each station within which the real-time constraints for the three types of data traffic are met, Since the scheduling of the data traffic may reduce the possibility of the abrupt increase of the network load this paper proposes a brief heuristic method to make a scheduling table to satisfy their real-time constraints.

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Performance management of communication networks for computer integrated manufacturing Part ll: Decision making (컴퓨터 통합 샌산을 위한 통신망의 성능관리)

  • Lee, Suk
    • Journal of the Korean Society for Precision Engineering
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    • v.11 no.4
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    • pp.138-147
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    • 1994
  • Performance management of computer networks is intended to improve a given network performance in order for more efficient information exchange between subsystems of an integrated large-scale system. Improtance of performance management is growing as many function of the large- scale system depend on the quality of communication services provided by the network. The role of performance management is to manipulate the adjustable protocol parameters on line so that the network can adapt itself to a dynamic environment. This can be divided into two subtasks : performance evaluation to find how changes in protocol parameters affect the network performance and decision making to detemine the magnitude and direction of parameter adjustment. This paper is the second part of the two papers focusing on conceptual design, development, and evaluation of performance management for token bus networks. This paper specifically deals with the task of decision making which utilizes the principles of stochastic optimization and learning automata. The developed algorithm can adjuxt four timer settings of a token bus protocol based on the result of performance evaluation. The overall performance management has been evaluated for its efficacy on a network testbed.

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Performance Management of Communication Networks for Computer Intergrated Manufacturing (컴퓨터 통합 생산을 위한 통신망의 성능 관리)

  • Lee, S.
    • Journal of the Korean Society for Precision Engineering
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    • v.11 no.4
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    • pp.126-137
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    • 1994
  • Performance management of computer networks is intended to improve a given network performance in order for more efficient information exchange between subsystems of an integrated large-scale system. Importance of perfomance management is growing as many functions of the large- scale system depend on the quality of communication services provided by the network. The role of performance management is to manipulate the adjustable protocol parameters on line so that the network can adapt itself to a dynamic environment. This can be divided into two subtasks : performance evaluation to find how changes in protocol parameters affect the network performance and decision making to determine the magnitude and direction of parameter adjustment. This paper is the first part of the two papers focusing on conceptual design, development, and evaluation of performance management for token bus networks. This paper specifically deals with the task of performance evaluation which utilizes the principle of perturbation analysis of discrete event dynamic systems. The developed algorithm can estimate the network performance under a perturbed protocol parameter setting from observations of the network operations under a nominal parameter setting.

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Performance Management of Token Bus Networks for Computer Integrated Manufacturing (컴퓨터 통합생산을 위한 토큰버스 네트워크의 성능관리)

  • Lee, Sang-Ho;Lee, Suk
    • Journal of the Korean Society for Precision Engineering
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    • v.13 no.6
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    • pp.152-160
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    • 1996
  • This paper focuses on development and evaluation of a performance management algorithm for IEEE 802.4 token bus networks to serve large-scale integrated manufacturing systems. Such factory automation networks have to satisfy delay constraints imposed on time-critical messages while maintaining as much network capacity as possible for non-time-critical messages. This paper presents a network performance manager that adjusts queue capacity as well as timers by using a set of fuzzy rules and fuzzy inference mechanism. The efficacy of the performance management has been demonstrated by a series of simulation experiments.

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Development of Fuzzy Network Performance Manager for Token Bus Networks in Automated Factories (공장자동화용 토큰버스 네트워크의 퍼지 성능관리기 개발)

  • Lee, Sang-Ho;Son, Joon-Woo;Lee, Suk
    • Transactions of the Korean Society of Mechanical Engineers A
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    • v.20 no.8
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    • pp.2436-2448
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    • 1996
  • This paper presents the development of three types of network performance manager for IEEE 802.4 token bus networks that are a part of Manufacturing Automation Protocol(MAP). The performance managers attempt to keep the average data latency below a certain level specified for each priority class. All of the three performance managers are based on a set of fuzzy rules incorporating the knowledge on the relationship between data latency and parameters of the priority mechanism. These Fuzzy Network Performance Managers(FNPMs) have been evaluated via discrete event simulation to demonstrate their efficacy.

Implementation and Operation of Network Interface Module based on Mini- MAP Environment (Mini-MAP 환경에서 네트워크 접속장치의 구현과 시험 운영)

  • Lee, Min-Nam;Kim, Jeong-Ho;Lee, Sang-Beom
    • The Transactions of the Korea Information Processing Society
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    • v.1 no.2
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    • pp.263-271
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    • 1994
  • Automation of production in modern manufacturing is based on the integration of the various stage of production process by means of processing system. Information processing and network interface are of fundamental importance in programmable device in industrial automation, as they essential in order to active integration in production lines. In this paper, TBC(token bus controller) in the Mini-MAP board performs the function of the MAC sublayer, The LLC sublayer is implemented according to the specification of Class 3 that includes Type 1 and 3. And the MMS services are designed within the scope of implementation MAP 3.0 All the softwares are implemented under the real time executive for real time application of the Mini-MAP and they are loaded into PROMs at the network board. We tested the LLC functions to make use of a protocol analyzer for the token bus protocol. Also the MMS conformance test was carried out by exchanging primitives between a model system(including NIU) and a MMS product that had already passed the conformance the conformance test based on measurement method of network analysis.

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An Implementation of Multiprotocol-Based Data Communication System Using (80C152를 이용한 멀티프로토콜의 구현)

  • Heo, Pil-U
    • 연구논문집
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    • s.25
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    • pp.137-146
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    • 1995
  • This paper deals with multi protocol based data communication system, which allows to improve the performances. The hardware and software of the data cmmunication system was implemented by using the CSMA/CD and Token bus access methods. The performance evaluation was also carried out and the results were verified to validate

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