On-board Signaling Device

The on-board signaling device is a core safety control unit on trains.
It communicates with trackside equipment, receiving and processing real-time data
on operating speed, location, and signaling information to ensure safe and efficient train operation.

On-board Signaling Device
  • Integrated

    On-board
    Signaling Device
    ATS/ATC/ATP/KTCS-2

    • The Integrated On-board Signaling Device combines KTCS-2,
      Korea’s next-generation train control system, with existing ATC and ATS signaling systems.
      It enhances railway operational efficiency and safety while ensuring seamless compatibility
      across railway environments where multiple signaling infrastructures coexist.
  • Key Components

    • KVC (On-board Control Computer)
      KVC (On-board Control Computer)
      • Responds to various signaling systems
        of KTCS-2/ATC/ATS
      • Management of Movement Authority (MA), speed profile calculation, generation and management of braking curves, integration and management of location information
      • Ensures reliability through system redundancy
      • Safety secured with a fail-safe design
        of 2 out of 2 structure
      • GA SIL 4 product certification
    • BTM (Balise Transmission Module)
      BTM (Balise Transmission Module)
      • Demodulation and decoding
        of balise signals
      • Guarantees a maximum passing speed
        of 500 km/h
      • Ensures reliability through
        system redundancy
      • Safety secured with a fail-safe design
        of 2 out of 2 structure
      • GA SIL 4 product certification
    • BTM Antenna
      BTM Antenna
      • Tele-powering frequency: 27.095MHz
      • Data transmission frequency: 4.234MHz (FSK)
    • STU (Secure Transmission Unit)
      STU (Secure Transmission Unit)
      • Bidirectional data communication between trackside RBC and on-board KVC
      • Key generation, installation, deletion, addition, and key validity period updates
      • Redundant communication
        channel structure
    • DMI (Driver Display Unit)
      DMI (Driver Display Unit)
      • Compliance with ERTMS/ETCS standards and ensuring perfect compatibility
      • Display of ERTMS/ETCS level and braking status
      • Real-time display of the train's current speed, speed limit, and train status
      • Display of MRSP, gradient,
        and track information
      • Data input by the driver
        and execution of commands
      • Status information displayed
        using text and graphs
      • 10.4-inch high-brightness color touchscreen
      • Reliability secured through system redundancy
    • JRU (Train Operation Information Recording Device)
      JRU (Train Operation Information Recording Device)
      • Recording and maintenance
        of operation information
        (mode, level, braking, speed, etc.)
      • Download to other media through standardized output interface
      • Minimum 24 hours of storage
        and recording of overall operational data
      • Minimum 1 week of storage
        for operational summary data
      • Durable memory module resistant
        to shock and fire
    • LTE-R Module
      LTE-R Module
      • Support for railway-specific LTE-R frequency band
      • Performance testing standards
        for LTE-based railway communication systems (TTALK0-06-0458)
    • LTE-R Antenna
      LTE-R Antenna
      • Supports 2x LTE-R @ 698-960 MHz
        MIMO method
      • LTE-R @ 6dBi or higher
      • Waterproof rating IP67
    • KVC (On-board Control Computer)
      Speed Sensor (Wheel Sensor)
      • Non-contact Hall Sensor type
      • Speed measurement
        range 0 km/h to 350 km/h
      • Waterproof rating IP67
      • Compliance with environmental
        standard EN 50155
    • Doppler Radar Sensor
      Doppler Radar Sensor
      • 24.125GHz microwave Doppler radar technology applied
      • Usable speed range: 0.2 km/h - 600 km/h
      • Speed measurement without
        the influence of wheel slip through
        direct trackside measurement
      • IP67 rating
      • Complies with environmental standard
        EN 50155 (can be replaced with an accelerometer based on customer needs)
  • Key Functions

    • KTCS-2(ATP)
      • On-board device based on European standard ETCS Level 2
      • Real-time train control via LTE-R based wireless communication
      • Train operation management based on Movement Authority (MA)
      • Optimal operation control through precise location detection
    • ATC
      • Perfect compatibility with existing ATC signal systems
      • Automatic recognition and control of existing ATC sections
      • Automatic speed control and deceleration function
      • Automatic management of KTCS-2/ATC/ATS transition sections
    • ATS
      • Perfect compatibility with existing ATS signal systems
      • Warning and braking for exceeding allowed speed
      • Emergency stop
      • Driver warning system
  • Technical Features

      • Smooth operation in KTCS-2, ATC, and ATS sections with a single on-board device
      • Perfect interoperability between existing signal systems
        and new systems
      • Flexible design applicable to various vehicle types
      • SIL 4 certified design
      • Improved system reliability through redundant design
      • Real-time self-diagnosis
        and error detection
      • Increased transport
        capacity by optimizing train operation intervals
      • Modular design for maintenance
      • Designed for KTCS-3 upgrade
  • Achievements

    KTCS-2 Onboard Signaling Pilot (2020–2023)
    • 01
      Participation in the national R&D LTE-R based KTCS-2 commercialization project (2015)

      Successful development of KTCS-2 on-board signaling device through LTE-R based KTCS-2 commercialization project

    • 02
      Successful launch of KTCS-2
      on-board signaling device

      Through the Jeolla Line KTCS-2 pilot project,
      KTCS-2 on-board signaling devices were manufactured and installed on KTX-1 vehicles,
      and successful pilot operation was conducted.

    • 03
      Perfect interoperability

      Ensures seamless interoperability with KTCS-2 trackside signaling devices, enabling stable
      and reliable train operations across diverse
      signaling environments

    • 04
      Compliance with international standards

      Compliance with performance requirements of the European standard railway signaling control system ERTMS/ETCS Subset 2.3Od Baseline 2 Ensuring international compatibility for integration with global railway systems

    • 05
      Verified stability

      Testing completed for resistance to extreme temperature and humidity environments / Electromagnetic compatibility (EMC) /
      Passed vibration and shock durability tests

  • Key Milestones

    • Obtained approval for railway vehicle modification (2022)
      Obtained approval
      for railway vehicle modification
      (2022)
      • Passed strict review under domestic railway safety laws
      • Complete verification of vehicle modification technology
      • Ensured compatibility with existing vehicles
    • Acquired the world’s only SA product certification (2023)
      Acquired the world’s only
      SA product certification
      (2023)
      • The highest safety integrity level in the railway safety field, SIL 4
        (SA product certification)
      • Application of high-reliability safety control architecture
      • Implementation of perfect safety operation in hazardous situations (Fall-Safe) functionality