Indian Railways Dispatcher Functional Requirements
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What is the primary function of the Dispatcher in the Railway Communication System?

  • To provide power supply to the entire railway network
  • To connect trains to the ETCS system
  • To manage voice and data communication between trains and the control center (correct)
  • To record and store voice channels

    • What is the maximum number of voice channels that can be directly connected to the Voice Recorder?

  • 80
  • 60
  • 120 (correct)
  • 100

    • What is the primary function of the GSC equipment?

  • To provide power supply to the Voice Recorder
  • To record and store voice channels
  • To connect the Dispatcher to the MSC (correct)
  • To manage data communication between trains

    • What is the purpose of the BGT UIF shelf in the GSC?

    <p>To interface with ISDN BRI/PRI</p> Signup and view all the answers

    What is the Cab Radio used for?

    <p>For both voice and data communication</p> Signup and view all the answers

    What is the purpose of the Hands-free key in the Audio Module?

    <p>To enable hands-free communication</p> Signup and view all the answers

    What type of power supply is required by the GSC?

    <p>Uninterrupted AC Power Supply</p> Signup and view all the answers

    What type of bands does the MT2 Mobile Termination operate in?

    <p>R-GSM, E-GSM, and P-GSM</p> Signup and view all the answers

    What is the transmission output power of the Mobile Station Class 2?

    <p>8 watt</p> Signup and view all the answers

    What is the function of the GPI in the Cab Radio?

    <p>General purpose interface for serial data transmission and control of MMI</p> Signup and view all the answers

    What is the primary function of the SC in the Cab Radio?

    <p>Initialization of the entire Cab Radio</p> Signup and view all the answers

    What is the function of the FCM in the Cab Radio?

    <p>Filter and connector module</p> Signup and view all the answers

    What type of communication is possible with the MT2 Mobile Termination?

    <p>Full-duplex data communication</p> Signup and view all the answers

    What is the function of the SV2 in the Cab Radio?

    <p>Power supply, DC/DC converter for internal supply</p> Signup and view all the answers

    What is the function of the SCOI in the Cab Radio?

    <p>System controller with dual serial data port and parallel I/O</p> Signup and view all the answers

    What type of multiple access techniques are used in the radio link in GSM-R?

    <p>Both FDMA and TDMA</p> Signup and view all the answers

    What is the frequency band used for downlink signals in GSM-R?

    <p>935-960 MHz</p> Signup and view all the answers

    What is the interface between the MSC and the VLR in the GSM-R system?

    <p>Interface B</p> Signup and view all the answers

    What is the subsystem that includes the Base Station Subsystem (BSS) and the Mobile Station (MS) in GSM-R?

    <p>Base Station Sub system (BSS)</p> Signup and view all the answers

    What is the frequency band used for uplink signals in GSM-R?

    <p>890-915 MHz</p> Signup and view all the answers

    What is the interface between the TCU and the MSC in the GSM-R system?

    <p>Interface A</p> Signup and view all the answers

    What is the subsystem that includes the MSC and the VLR in GSM-R?

    <p>Network and Switching Subsystem (NSS)</p> Signup and view all the answers

    What is the interface between the MS and the BTS in the GSM-R system?

    <p>Interface Um</p> Signup and view all the answers

    What is the maximum power consumption of the device in idle mode?

    <p>3W</p> Signup and view all the answers

    How many LEDs are available for indication in the system?

    <p>7</p> Signup and view all the answers

    What type of power supply is used to cater up to 233 Amp in the GSM-R system?

    <p>-48V DC supply</p> Signup and view all the answers

    What is the primary purpose of the EIRENE Functional Requirement Specification (FRS)?

    <p>To outline the functional requirements for railway communication systems</p> Signup and view all the answers

    What is the purpose of the soft keys in the system?

    <p>To depend on the currently activated train radio application</p> Signup and view all the answers

    What is the responsibility of the Firm's Engineer during the installation of the system?

    <p>To supervise the installation process</p> Signup and view all the answers

    What is the main advantage of the eMLPP (enhanced Multi-Level Precedence and Preemption) feature in GSM-R?

    <p>It provides resource preemption for priority calls</p> Signup and view all the answers

    What is the primary function of the Base Station Subsystem (BSS) in the GSM-R system?

    <p>To manage the radio interface between the mobile station and the BSS</p> Signup and view all the answers

    What is the requirement for the floor of the NSS equipment room?

    <p>It should be spacious and robust</p> Signup and view all the answers

    What is the function of the button for calling the Station Master?

    <p>To call the Station Master</p> Signup and view all the answers

    What is the main benefit of the Functional Addressing feature in GSM-R?

    <p>It reaches a user or application by means of a number, which identifies the relevant function</p> Signup and view all the answers

    What is the primary purpose of the A interface in the GSM-R system?

    <p>To connect the BSS to the Network Switching Subsystem (NSS)</p> Signup and view all the answers

    What is the capacity of the 230V AC UPS supply in the GSM-R system?

    <p>Up to 500 erlang</p> Signup and view all the answers

    What is the main advantage of the Location Dependent Addressing feature in GSM-R?

    <p>It allows for routing of mobile originated calls to the correct controller based on geographic location</p> Signup and view all the answers

    What is the primary function of the Mobile Station (MS) in the GSM-R system?

    <p>To connect to the Base Station Subsystem (BSS) through the radio interface</p> Signup and view all the answers

    What is the primary benefit of the Voice Broadcast Call feature in GSM-R?

    <p>It allows groups of users to receive common information</p> Signup and view all the answers

    What is the function of the button next to the emergency call indicator?

    <p>To call the Station Master</p> Signup and view all the answers

    How many LEDs are available for indication in the system?

    <p>7</p> Signup and view all the answers

    What is the average power consumption of the device?

    <p>18W</p> Signup and view all the answers

    What type of power supply is used to cater up to 233 Amp in the GSM-R system?

    <p>-48V DC supply</p> Signup and view all the answers

    What is the purpose of the soft keys in the system?

    <p>To implement the functionality of the currently activated train radio application</p> Signup and view all the answers

    What is the requirement for the floor of the NSS equipment room?

    <p>It should be robust and strong enough to carry the equipment loads</p> Signup and view all the answers

    What is the capacity of the 230V AC UPS supply in the GSM-R system?

    <p>15KVA</p> Signup and view all the answers

    Who is responsible for supervising the installation of the system?

    <p>The Firm's Engineer</p> Signup and view all the answers

    What is the primary function of the OMC-S in the NSS part?

    <p>NSS configuration management</p> Signup and view all the answers

    What is the classification of the alarm that appears in red color?

    <p>Critical</p> Signup and view all the answers

    What kind of views does the OMC-R window show?

    <p>Logical and physical</p> Signup and view all the answers

    What is the purpose of the calendar in the common functions?

    <p>Deferred or periodic execution of a command or a command file</p> Signup and view all the answers

    What is the purpose of the file transfer management in the OMC-R?

    <p>Downloading and activation of the software released dedicated to TCU, BSC, BCF and TRX</p> Signup and view all the answers

    What is the purpose of the performance management in the OMC-S?

    <p>Traffic control and service quality monitoring</p> Signup and view all the answers

    How can you see the alarm in the OMC-R?

    <p>Click the right-hand mouse button pointing to the menu and select show alarm</p> Signup and view all the answers

    What is the purpose of the system management in the OMC-S operation?

    <p>All of the above</p> Signup and view all the answers

    What is the primary function of the SDM-FT?

    <p>To act as a data collection, data processing, and local mediation entity</p> Signup and view all the answers

    What type of trunks are used for bearer channel connectivity?

    <p>PCM30 trunks</p> Signup and view all the answers

    How does MSC connect to the IWF unit?

    <p>Through a user Datagram Protocol/Internet Protocol (UDP/IP) application over Ethernet</p> Signup and view all the answers

    What is the function of the Integrated Services Module (ISM)?

    <p>To provide auxiliary and support functionality such as Recorded Announcement machines</p> Signup and view all the answers

    What is the significance of IWF in GSM-R deployment?

    <p>It is necessary for European Train Management System (ERTMS) deployment</p> Signup and view all the answers

    What is the function of MSC in GSM-R?

    <p>It connects to the network-side interworking function over a Network-side IWF trunk</p> Signup and view all the answers

    What is the significance of mapping functional number with corresponding MSISDN?

    <p>It enables Functional Addressing</p> Signup and view all the answers

    What is the purpose of Conference Circuits in ISM?

    <p>To provide auxiliary and support functionality</p> Signup and view all the answers

    What is the primary function of the FCM module in the Cab Radio?

    <p>To distribute the 24-110V DC power supply to the SV2 and SV3 converters</p> Signup and view all the answers

    What is the purpose of the soft keys in the MMI?

    <p>To dynamically adapt to different functions</p> Signup and view all the answers

    What is the typical power supply range for the SV2 and SV3 converters?

    <p>24-110V DC</p> Signup and view all the answers

    What is the function of the connector panel in the FCM?

    <p>To connect the solid connectors for power supply, MMIs, and Data Interfaces</p> Signup and view all the answers

    What is the purpose of the RESET hard key in the MMI?

    <p>To reset the system</p> Signup and view all the answers

    What is the function of the filter elements in the FCM?

    <p>To protect the input and output voltages from transients</p> Signup and view all the answers

    What is the component that provides a display for the user in the MMI?

    <p>Monochrome Display</p> Signup and view all the answers

    What is the function of the coupler relay in the FCM?

    <p>To run the consumer voltage 24V to the connectors of MMI</p> Signup and view all the answers

    What is the primary function of the General Purpose Interface component?

    <p>To simultaneously control up to two operating units MMI with voice and control circuits</p> Signup and view all the answers

    What is the purpose of the 4 optical coupler inputs in the Public Address Intercom?

    <p>For UIC control of the train loudspeaker</p> Signup and view all the answers

    What is the output voltage of the DC-DC converter SV2?

    <p>13V and 5V</p> Signup and view all the answers

    What is the function of the status LED on the front side of the DC-DC converter SV2 housing?

    <p>To indicate that both voltage outputs and the internal temperature lie within the permitted range</p> Signup and view all the answers

    What type of power supply is required by the DC-DC converter SV2?

    <p>24V to 110V DC</p> Signup and view all the answers

    What is the purpose of the signal corresponding to the LED on the DC-DC converter SV2?

    <p>To provide a power fail signal with TTL level at the back panel bus</p> Signup and view all the answers

    What is the function of the Public Address Intercom PAI component?

    <p>To connect the train's loudspeaker and telephone to the Cab Radio</p> Signup and view all the answers

    What is the purpose of the General Purpose Interface component in the Cab Radio?

    <p>To control the train's loudspeaker and telephone</p> Signup and view all the answers

    Study Notes

    Dispatcher

    • The D1CORA-P (Dispatcher) fulfills several functional requirements:
      • Five registers on the display with 55 DA-Keys each
      • Outgoing calls possible via keypad and telephone book
      • Touch-sensitive display
      • Monitoring, Conference, Call Transfer, and Call Forwarding capabilities
      • System status display and error management
      • User-specific settings (Volume, Microphone ON/OFF, clearing mode)
      • Accept and Send emergency calls
      • Functions Management
    • The Dispatcher consists of an audio module and a touch panel module:
      • Audio Module:
        • Handset
        • Loud Speaker
        • Interlock Key
        • Two Emergency Keys (N1, N2) and an interlock key
        • Hands-free key
        • Microphone key (for muting the microphone)
        • Key for monitoring Loud Speaker ON/OFF
        • Gooseneck Microphone
        • Headset
        • Interface to the main module
      • Touch Panel Module:
        • Screen Unit
        • Industrial PC
        • ISDN BRI Interface
        • Audio Module Interface
        • Voltage Supply

    Block Diagram of Dispatcher Connection

    • The Dispatcher is connected to the MSC through the Ground Switch (GSC) equipment

    Voice Recorder

    • Stores voice established through the Dispatcher
    • Can directly connect 120 voice channels

    Ground Switch (GSC)

    • Consists of the following shelves:
      • BGT DATA - Connects DMC
      • BGT PSU
      • BGT UIF - ISDN BRI/PRI
      • BGT PRI - Connects Dispatcher
    • Requires uninterrupted AC Power Supply

    Cab Radio

    • Suitable for voice and data communication
    • Can be used with ETCS for train control
    • Consists of three units:
      • Radio Unit
      • Operating Units MMI
      • Antenna

    Components of Cab Radio

    • MT2 (Mobile Termination 2nd Generation)
    • SCOI (System controller with dual serial data port and parallel I/O)
    • GPI (General purpose interface for serial data transmission and control of MMI)
    • PAI (Public Address Intercom)
    • SV2 (Power supply, DC/DC converter for internal supply)
    • FCM (Filter and connector module)

    Key Features of MT2

    • Operates in the R-GSM, E-GSM, and P-GSM bands
    • Mobile Station Class 2 (8 watt transmission output)
    • All ASCI features
    • All GSM phase supplementary services
    • Robust design for use in railroad environment
    • Full duplex data communication
    • SIM commands for editing and using EIRENE and ASCI specific fields of the SIM card
    • SIM tool kit
    • Testing and diagnosis possible both online during operation and offline

    System Controller (SC)

    • Initializes the entire Cab Radio
    • Performs self-test and status monitoring
    • Fault and protocol logging
    • Administers the service interface for diagnosis, configuration, and software download
    • Administers configuration data
    • Registers and deregisters functional numbers
    • Call control functionality for all connected terminal devices

    GSM-R

    • Mobile Train Radio communication is a digital wireless network based on GSM-R
    • Designed on EIRENE (European Integrated Railway Radio Enhanced Network) Functional requirement specification (FRS) and System Requirement specification (SRS)

    Basic Features of GSM-R

    • Point to Point call
    • Voice Broadcast call
    • Voice Group call
    • Emergency call
    • Functional addressing
    • Location-dependent addressing

    System Architecture

    • Mobile Station (MS) communicates with a Base Station Subsystem (BSS) through the radio interface
    • BSS is connected to the Network Switching Subsystem (NSS) using the A interface

    Interfaces

    • Um: Radio link between MS and BTS (Air interface)
    • Abis: Between BTS and BSC (PCM 2 Mbps)
    • Ater: Between BSC and TCU (PCM 2 Mbps)
    • A: Between TCU and MSC (PCM 2 Mbps)
    • B: Between MSC and VLR
    • C: Between MSC and HLR
    • D: Between HLR and VLR
    • E: Between two MSCs

    GSM-R System Subsystems

    • Mobile Station (MS)
    • Base Station Subsystem (BSS)
    • Network and Switching Subsystem (NSS)
    • Operating Subsystem (OSS)
    • Dispatcher
    • Cab Radio
    • Power Supply Arrangement

    Radio Interface and Frequency Used in GSM-R

    • Radio link uses both FDMA (Frequency Division Multiple Access) and TDMA (Time Division Multiple Access)
    • 900 MHz frequency bands for downlink and uplink signals are 935-960 MHz and 890-915 MHz respectively

    Filter and Connector Module FCM

    • FCM takes on the following tasks in the Cab Radio voice section:
      • Connector panel: solid connectors for power supply, MMIs, Data Interfaces, and UIC interface are connected mechanically and electrically to the panel
      • Power distribution: on-board 24-110V DC power supply is distributed among the two DC converters SV2 and optional SV3
      • Filter function: input and output voltages are protected by coarse protection elements and filters against transients from the locomotive power supply

    Operating Unit MMI (Man Machine Interface)

    • The operating unit is an important component of the Cab Radio
    • It serves for input of commands via the keyboard and provides the user with comprehensive information on a display
    • Components of the MMI:
      • Monochrome Display
      • Key Board
      • PC Board
      • LED indicators
      • Audio Amplifier
      • Charging Unit for the driver mobile telephone
      • Housing
    • Hard keys present:
      • RESET
      • Selection Key Up x DM
      • Enter Key
      • Emergency Call button
      • Call to train conductor
      • Call loc-loc
      • Call in the train (train announcement)
      • Button for calling the Station Master

    Soft Keys

    • No permanent functions are assigned to the soft keys
    • The function of the key depends on the currently activated train radio application (GSM-R or analog) and the configured operating level

    LED Indicators

    • A total of 7 LEDs are available which are only activated as required
    • LED indicators:
      • Emergency call indicator next to emergency call button
      • One LED next to each of the hard key for SM, train controller
      • Two status LEDs
    • All LEDs can be controlled from the SC via the RS422 interface

    Power Consumption

    • The average power consumption is 18W
    • If the device is in the idle mode, the maximum power consumption is 3W (i.e., dark display)

    Power Supply Arrangement of GSM-R System

    • Power supply arrangement at NSS site:
      • Centralized site consists of MSC (D.C. supply), IN (A.C. supply), OSS (OMC-R and OMC-S) (A.C. supply), and Dispatcher (A.C. supply)
      • All equipment is run by an uninterrupted (-)48V DC supply and 230V AC supply
      • The network is capable of catering up to 500 erlang need –48V supply capable of catering up to 233 Amp (Typical for a system by M/s. Nortel)
      • The 230V AC UPS (15KVA) supply for an installation to cater up to 500 erlang (Typical for a system by M/s. Nortel)

    Installation of the System

    • Installation of the system should be done as per firm's guideline and under supervision of Firm's Engineer
    • Site selection for NSS equipment room:
      • The NSS equipment room should be spacious and the floor should be robust and strong enough to carry the equipment loads

    General Purpose Interface

    • The general-purpose interface component is used for simultaneous control of up to two operating units MMI with voice and control circuits or a single MMI with one remote data transmission application

    Public Address Intercom

    • The Public Address & Intercom PAI component services to connect the train's loudspeaker and the train telephone to the Cab Radio
    • Interfaces:
      • A symmetrical audio output to the train loudspeaker
      • A symmetrical input/output to the train telephone – including optical coupler for evaluation of the conditions for the connection to the locomotive driver or the central control station
      • 4 optical coupler inputs for UIC control of the train loudspeaker
      • 4 optical coupler outputs for UIC control of the train loudspeaker

    SV2: DC-DC Converter

    • The DC-DC converter SV2 serves for generation of operating voltages (13V and 5V) that are required for internal supply of power to the components of the Cab Radio
    • The DC on-board supply of locomotive with nominal voltage between 24V and 110V DC serves as the power source
    • The DC-DC converter SV2 offers potential separation and protection against transient voltages, voltage fluctuations, and EM influences according to the requirements of locomotive
    • A status LED on the front side of the housing lights constantly when both voltage outputs and the internal temperature lie within the permitted range

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    GSM-R Mobile Train Radio Communications PDF

    Description

    This quiz covers the functional requirements of the Dispatcher, a part of Indian Railways' telecom system, including display features and call management capabilities.

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