Indian Railways Dispatcher Functional Requirements

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Questions and Answers

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?

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?

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

What is the Cab Radio used for?

For both voice and data communication Signup and view all the answers

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

To enable hands-free communication Signup and view all the answers

What type of power supply is required by the GSC?

Uninterrupted AC Power Supply Signup and view all the answers

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

R-GSM, E-GSM, and P-GSM Signup and view all the answers

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

8 watt Signup and view all the answers

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

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

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

Initialization of the entire Cab Radio Signup and view all the answers

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

Filter and connector module Signup and view all the answers

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

Full-duplex data communication Signup and view all the answers

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

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

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

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

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

Both FDMA and TDMA Signup and view all the answers

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

935-960 MHz Signup and view all the answers

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

Interface B 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?

Base Station Sub system (BSS) Signup and view all the answers

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

890-915 MHz Signup and view all the answers

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

Interface A Signup and view all the answers

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

Network and Switching Subsystem (NSS) Signup and view all the answers

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

Interface Um Signup and view all the answers

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

3W Signup and view all the answers

How many LEDs are available for indication in the system?

7 Signup and view all the answers

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

-48V DC supply Signup and view all the answers

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

To outline the functional requirements for railway communication systems Signup and view all the answers

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

To depend on the currently activated train radio application Signup and view all the answers

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

To supervise the installation process Signup and view all the answers

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

It provides resource preemption for priority calls Signup and view all the answers

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

To manage the radio interface between the mobile station and the BSS Signup and view all the answers

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

It should be spacious and robust Signup and view all the answers

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

To call the Station Master Signup and view all the answers

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

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

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

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

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

Up to 500 erlang Signup and view all the answers

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

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

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

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

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

It allows groups of users to receive common information Signup and view all the answers

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

To call the Station Master Signup and view all the answers

How many LEDs are available for indication in the system?

7 Signup and view all the answers

What is the average power consumption of the device?

18W Signup and view all the answers

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

-48V DC supply Signup and view all the answers

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

To implement the functionality of the currently activated train radio application Signup and view all the answers

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

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

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

15KVA Signup and view all the answers

Who is responsible for supervising the installation of the system?

The Firm's Engineer Signup and view all the answers

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

NSS configuration management Signup and view all the answers

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

Critical Signup and view all the answers

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

Logical and physical Signup and view all the answers

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

Deferred or periodic execution of a command or a command file Signup and view all the answers

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

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

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

Traffic control and service quality monitoring Signup and view all the answers

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

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

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

All of the above Signup and view all the answers

What is the primary function of the SDM-FT?

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

What type of trunks are used for bearer channel connectivity?

PCM30 trunks Signup and view all the answers

How does MSC connect to the IWF unit?

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

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

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

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

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

What is the function of MSC in GSM-R?

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

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

It enables Functional Addressing Signup and view all the answers

What is the purpose of Conference Circuits in ISM?

To provide auxiliary and support functionality Signup and view all the answers

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

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

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

To dynamically adapt to different functions Signup and view all the answers

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

24-110V DC Signup and view all the answers

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

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

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

To reset the system Signup and view all the answers

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

To protect the input and output voltages from transients Signup and view all the answers

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

Monochrome Display Signup and view all the answers

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

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

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

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

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

For UIC control of the train loudspeaker Signup and view all the answers

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

13V and 5V 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?

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

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

24V to 110V DC Signup and view all the answers

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

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

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

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

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

To control the train's loudspeaker and telephone 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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Description

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