• Title/Summary/Keyword: Data Link Protocol

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A New Data Link Protocol for Railway Signaling Systems

  • Hwang, Jong-Gyu;Lee, Jae-Ho;Park, Yong-Jin;Park, Gwi-Tae
    • KIEE International Transaction on Electrical Machinery and Energy Conversion Systems
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    • v.3B no.4
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    • pp.195-201
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    • 2003
  • In accordance with the computerization of railway signaling systems, the interface link between signaling equipment has been replaced by a digital communication channel and the importance of this communication link has become increasingly significant. However, there are some problems with the present state of railway signaling. First, different communication protocol is applied to interfaces between signaling although they have the same functions. Next, the communication protocols currently used in the railway fields contain various illogical components such as structure, byte formation, error correction scheme and so on. To solve these matters, a new data link protocol for railway signaling systems is designed. In this paper, the structure of protocol and the results of performance analyses are presented. It will be expected to increase the safety, reliability and efficiency of maintenance of signaling systems by using the designed communication protocol for railway signaling in Korea.

Performance Analysis of Adaptive Frame Size Control Scheme in Wireless Networks (무선 통신망에서의 적응 프레임 길이 제어 방식의 성능 분석)

  • Kim, Eung-In
    • 전자공학회논문지 IE
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    • v.47 no.2
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    • pp.54-59
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    • 2010
  • This paper suggests a new data link protocol with an adaptive frame length control scheme for wireless data networks which is subject to errors that occur with time variance. We analyze the proposed scheme under a two-state markov block interference(BI) model. Numerical results show that the proposed scheme can achieve high throughput performance for both dense and diffuse burst noise channels.

Performance Analysis of Data Link Protocol for Interface between EIS and LDTS (전자연동장치와 역정보전송장치간 인터페이스를 위한 데이터링크 프로토콜 성능해석)

  • Hwang, Jong-Gyu;Lee, Jae-Ho
    • Journal of the Korean Society for Railway
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    • v.6 no.2
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    • pp.135-141
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    • 2003
  • According to the computerization of railway signaling systems, the interface link between these signaling equipment is also replaced by digital communication channel, expecially communication link for interface between EIS and LDTS, but there are some problems in the present state of railway signaling. First of all, different communication protocol is applied to interface between above two signaling equipment although they have same functions. The other is that the communication protocol currently used in railway field has some unreasonable points such as structure, formation of byte, error correction scheme and etc. To solve these problems, the standard communication protocol for railway signaling is designed. The structure of designed communication protocol and the results of performance analyses are represented in this paper. It will be expected the increase of safety, reliability and efficiency of maintenance of signaling system by using of the designed communication protocol for railway signaling.

A Study on Network Operation Structure and DataLink Protocol for Interworking of Ground Network ALL-IP at Next-Military Satellite Communication (차기군위성통신에서 지상망 ALL-IP 연동을 위한 네트워크 운용구조 및 데이터링크 프로토콜 연구)

  • Lee, Changyoung;Kang, Kyungran;Shim, Yong-hui
    • Journal of the Korea Institute of Military Science and Technology
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    • v.21 no.6
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    • pp.826-841
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    • 2018
  • The military satellite communication of ROK military, ANASIS is designed for analog data such as voice and streaming data. ANASIS cannot fully support ALL-IP communications due to its long propagation delay. The next generation satellite communication system is being designed to overcome the limitation. Next generation satellite communications system considers both high-speed and low-speed networks to support various operating environment. The low-speed satellite supports both broadband and narrow-band communication. This network works as the infrastructure for of wide-area internetworking over multiple AS's in the terrestrial network. It requires minimum satellite frequency and minimum power and works without PEP and router. In this paper, we propose a network operation structure to enable the inter-operation between high and low-speed satellite networks. In addition, we propose a data link protocol for low speed satellite networks.

Design of Data Link Protocol Performance Analysis Tool for Railway Signaling Communication Protocol (철도신호용 통신 프로토콜을 위한 데이터링크 성능분석 툴 설계)

  • 황종규;이재호;강문호;박용진
    • Proceedings of the Korean Information Science Society Conference
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    • pp.673-675
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    • 2002
  • 본 논문에서는 신뢰성 있는 통신을 요구하는 철도신호용 정보전송을 위해 설계한 프로토콜과 이 설계된 프로토콜의 데이터 링크제어의 성능분석을 위한 시뮬레이터의 개발에 대해 설명한다. 우선 철도신호용 통신 프로토콜의 성능분석을 위해 Matlab/Simulink 윈도우상의 데이터 링크제어 시스템 화면에서 사용자 인터페이스 블록을 통해 통신 파라미터들을 선택하여 시뮬레이션을 행할 수 있는 시뮬레이션 툴과, Matlab이 제공하는 Rs232통신용API 기능을 이용하여 철도 신호장치간의 통신 프로토콜을 PC상에서 에뮬레이션 할 수 있는 시뮬레이터를 설계하였다.

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Lower layer implementation of a fieldbus network interface (Fieldbus 네트워크 접속기의 하위계층 구현)

  • 김현기;이전우;황선호;이혁희;채영도
    • 제어로봇시스템학회:학술대회논문집
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    • pp.337-341
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    • 1991
  • Fieldbus is a low level serial digital network which will be used for factory automation. This paper describes lower layer implementation of a Fieldbus network interface. Physical layer provides hardware interface between IBM-PC and Fieldbus. Also, physical layer uses manchester coding, shielded twisted pair lines and RS-485 electrical standard. Data link layer includes Intel's iDCX96 real time executive for 8797 one chip microcontroller and Fieldbus data link protocol software.

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DATA LINKS BETWEEN EMS AND SCADA SYSTEMS (EMS - SCADA 자료연계)

  • Lee, Kyung-Jae;Yu, Sung-Chul;Kim, Yeong-Han;Lee, Hyo-Sang
    • Proceedings of the KIEE Conference
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    • pp.109-113
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    • 1987
  • This paper briefly introduces a strategy of data links between EMS and SCADA systems for the KEPCO's EMS project. For the data links, front end/communication processors are adopted that provide for protocol conversion and communication processing in parallel with EMS/SCADA processing. The data link configuration for a communication channel is point to point links. The EMS - hardware and software - has capability of handling links utilizing both bisync protocol and X.25 (Level 1 and 2)protocol for the data link protocol.

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Performance Analysis of Data Link Protocol for Railway Signaling Interface (철도신호시스템 상호간 인터페이스를 위한 데이타링크 프로토콜 성능분석)

  • Hwang, Jong-Gyu;Lee, Jae-Ho;Kang, Moon-Ho
    • Proceedings of the KIEE Conference
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    • pp.2800-2802
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    • 2002
  • 본 연구는 철도신호 장치간 인터페이스를 위한 데이터 링크제어의 성능분석을 위하여 Matlab/simulink을 이용한 시뮬레이션과 시뮬레이터 개발을 목표로 하였다. 이를 위해 Simulink 윈도우상의 데이터 링크제어 시스템 화면에서 사용자 인터페이스 블록을 통해 통신 파라미터들을 선택하여 시뮬레이션을 행할 수 있는 시뮬레이션 툴과, Matlab이 제공하는 RS232통신용 API 기능을 이용하여 철도 신호장치간의 통신 프로토콜을 PC상에서 모사할 수 있는 프로토타입 시뮬레이터를 개발하였다.

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A Study to Efficiently Overcome GPS Jamming and GPS Spoofing by using Data Link System (데이터링크를 사용하는 체계에서 GPS 재밍(Jamming)과 GPS 기만(Spoofing)을 효과적으로 극복하기 위한 방안 연구)

  • Jee, Seungbae;Kim, Sangjun;Lee, Jungsik
    • Journal of the Korea Institute of Military Science and Technology
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    • v.18 no.1
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    • pp.37-45
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    • 2015
  • These days many systems use the gps signal to get their own position. Because it's cheap and accurate and convenient. But, the strength of gps signal is very weak and can be easily interrupted by GPS jamming and GPS spoofing. Normally, fighter can use DME, TACAN, etc to correct their position error when GPS is not working. But, many aircraft which does not have those kinds of hardware need to pay additional cost to get it. In this paper, we propose how to overcome GPS jamming and GPS spoofing by only using data link system. The main purpose of this paper is to make the data link protocol to get an exact position information of own unit at gps error environment.

A Study on Automatic Surveillance System using VHF Data Link Protocol (해상이동통신에서 VHF 데이터링크 프로토콜을 이용한 자동감시시스템)

  • 장동원;조평동
    • Journal of the Korea Institute of Information and Communication Engineering
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    • v.6 no.7
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    • pp.1026-1031
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    • 2002
  • In this Paper, We analysed the technical characteristics of a automatic identification system that will introduce in aviation and marine radio stations. IMO's Marine Safety Committee approved revision of chapter V of the Safety of Life at Sea(SOLAS) Convention in 73rd meeting. According to this, AIS will become a mandatory carriage requirement by 01 July 2002. AIS as a surveillance system continuously receives its own position from the GNSS and then repeatedly broadcasts it on a W:.u data link for avoiding traffic conflicts and possible disasters. VHF data link is organized so that a specified number of time slots make up a repeatable frame. Each radio station can autonomously allocate and deallocate slots within the frame using selection algorithm which is called SOTDMA(Self-Organized Time Division Multiple Access). The results can be an aid in the continued of understanding technical characteristics for AIS as a broad surveillance system.