Railway Communication System Equipment
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What is the primary purpose of the CCEO system in Indian Railways?

  • To enhance caller ID features in train control communication
  • To provide a platform for voice communication between control offices and way stations (correct)
  • To facilitate signaling through quad cable
  • To enable data services in control offices
  • What is the key benefit of VoIP-based train control communication system?

  • Enhanced security features
  • Use of common infrastructure for voice and data services (correct)
  • Reduced maintenance costs
  • Redundancy in infrastructure
  • What is the primary function of intercommunication equipment in a control office?

  • To enable voice communication with way stations
  • To provide facilities for each controller to call any other controller (correct)
  • To facilitate data services between controllers
  • To enhance signaling through quad cable
  • What is the significance of hybrid attachment in DTMF calling system?

    <p>To enable 2 Wire operation</p> Signup and view all the answers

    What is the key component of control office equipment in DTMF calling system?

    <p>Operating console with code generator</p> Signup and view all the answers

    What is the primary application of DTMF calling system in Indian Railways?

    <p>For train control communication between control offices and way stations</p> Signup and view all the answers

    What is the significance of 4 Wire operation in DTMF calling system?

    <p>It is the normal design for control office equipment</p> Signup and view all the answers

    What is the primary difference between way station equipment for 4 Wire and 2 Wire working in DTMF calling system?

    <p>Different way station equipment</p> Signup and view all the answers

    What is the purpose of the push button marked 'G' in the standard 16 key DTMF key pad?

    <p>For general call for calling stations simultaneously</p> Signup and view all the answers

    What is the type of desk type control telephone used in way station equipment?

    <p>2-Wire/4-Wire</p> Signup and view all the answers

    What is the voltage supply required for the CCEO system?

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

    What is the function of the 'RT' push button in the standard 16 key DTMF key pad?

    <p>For repeating last transmitted station code</p> Signup and view all the answers

    What is the name of the specification for the CCEO system?

    <p>RDSO/SPN/TC/66/2007</p> Signup and view all the answers

    What is the purpose of the 'RS' push button in the standard 16 key DTMF key pad?

    <p>For resetting the system</p> Signup and view all the answers

    What is the name of the equipment connected to traditional control communication system on OFC?

    <p>CCEO (Control Communication Equipment for OFC)</p> Signup and view all the answers

    What is the purpose of the 'DL' push button in the standard 16 key DTMF key pad?

    <p>For canceling the code</p> Signup and view all the answers

    What type of push buttons or keys should be provided in touch screen based dialing equipment for selective calling of any station?

    <p>Soft keys/tabs/buttons</p> Signup and view all the answers

    What is the purpose of the non-lockable type press-to-talk switch in the control phone?

    <p>To minimize background noise while in listening-only mode</p> Signup and view all the answers

    What feature should be provided in the system to inform the section controller when the bell/buzzer at the station rings?

    <p>Means to automatically inform the section controller</p> Signup and view all the answers

    What is the requirement for the signalling used for selective calling?

    <p>It should not hamper normal telephone conversation on the line</p> Signup and view all the answers

    What feature should be provided in the system to allow for prolonged ringing of any way-station?

    <p>Feature of prolonged ringing of any way-station</p> Signup and view all the answers

    What is the requirement for the equipment used in the system?

    <p>It should be rugged and capable of intensive use</p> Signup and view all the answers

    What is the requirement for the system's expansion capability?

    <p>It should be capable of progressive expansion without any replacement</p> Signup and view all the answers

    What is the requirement for Railway telecom alignment in Indian Railways?

    <p>No overhead Railway telecom alignment is permitted</p> Signup and view all the answers

    What is the maximum number of control telephones that can be connected at a way station using a MTWE unit?

    <p>4</p> Signup and view all the answers

    What is the purpose of the Test Room Equipment (TRE)?

    <p>To carry out maintenance and testing functions on way station equipment</p> Signup and view all the answers

    What is the minimum loop resistance required for the twisted pair connecting a TDCT to a MTWE?

    <p>1200 Ohm</p> Signup and view all the answers

    What is the purpose of the Three Way Amplifier (TWA) unit?

    <p>To connect more than four control telephones at a way station</p> Signup and view all the answers

    What type of cable is used to connect the MTWE unit to the VF channel from the PD Mux on the OFC system?

    <p>4-wire cable</p> Signup and view all the answers

    What is the standard telephone instrument used in a TDCT?

    <p>Handset with a numeric dial</p> Signup and view all the answers

    What is the equipment provided on the controller’s desk?

    <p>Control Room Equipment (CRE)</p> Signup and view all the answers

    What is the purpose of the Local Telephone Equipment (LTE)?

    <p>To provide 20 local telephones at Head Quarter</p> Signup and view all the answers

    What is the first step taken by the Section controller on duty in case of interruption such as complete ringing failure?

    <p>Localise the faulty section with the help of the way station operating staff</p> Signup and view all the answers

    Who is responsible for confirming the faulty section after localisation?

    <p>Technician/JE/SSE(Tele) on duty</p> Signup and view all the answers

    What is the purpose of utilizing the alternate path/circuits available for protection purpose?

    <p>To restore the working path from the protection path</p> Signup and view all the answers

    Who keeps a record of all interruptions on the control line as well as failure of way station and control office equipment?

    <p>SSE/JE incharge of the control office</p> Signup and view all the answers

    What is the purpose of providing an additional facility of single touch multi key phone?

    <p>To avoid discontinuity in control communication in case of failure of section controller HQ equipment</p> Signup and view all the answers

    In case of equipment failures/ 6 quad cable or OFC cut /damage in the section, who should be informed?

    <p>Field telecom staff/Railtel staff/Railtel NOC</p> Signup and view all the answers

    What should be done once the working path is restored?

    <p>The circuit functioning must be put back to the working path from the protection path</p> Signup and view all the answers

    Why is it desirable to get configured such switching arrangement in automatic mode?

    <p>To reduce manual intervention and make the process more efficient</p> Signup and view all the answers

    What is the function of the 'RC' push button in the standard 16 key DTMF key pad?

    <p>For row/column frequency check</p> Signup and view all the answers

    What is the type of desk type control telephone used in way station equipment?

    <p>2-Wire</p> Signup and view all the answers

    What is the purpose of the visual indication for 'System O.K'?

    <p>To indicate that the system is functioning correctly</p> Signup and view all the answers

    How can the DTMF station code/group code be selected in the way station equipment?

    <p>Using DIP switches</p> Signup and view all the answers

    What is the power supply required for the CCEO system?

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

    What is the purpose of the 'LR' push button in the standard 16 key DTMF key pad?

    <p>To extend long ring at way stations</p> Signup and view all the answers

    What is the purpose of the 'G' push button in the standard 16 key DTMF key pad?

    <p>For general call for calling stations simultaneously</p> Signup and view all the answers

    What is the type of communication equipment used in the control office?

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

    What is the maximum capacity of a MTWE unit?

    <p>4 control telephones</p> Signup and view all the answers

    What is the purpose of the Test Room Equipment (TRE)?

    <p>To carry out maintenance and testing functions on way station equipment</p> Signup and view all the answers

    What is the standard telephone instrument used in a TDCT?

    <p>Handset with a numeric dial and a loop resistance of less than 1200 Ohm</p> Signup and view all the answers

    What is the purpose of the Local Telephone Equipment (LTE)?

    <p>To provide 20 local telephones at Head Quarter</p> Signup and view all the answers

    What type of cable is used to connect the MTWE unit to the VF channel from the PD Mux on the OFC system?

    <p>4-wire cable</p> Signup and view all the answers

    What is the purpose of the Three Way Amplifier (TWA) unit?

    <p>To provide an additional MTWE unit at a way station</p> Signup and view all the answers

    What is the equipment provided on the controller’s desk?

    <p>Control Room Equipment (CRE)</p> Signup and view all the answers

    How many local telephones can be provided at Head Quarter using the LTE?

    <p>20 local telephones</p> Signup and view all the answers

    What is the size of the Deputy Controller-I and Controller rooms?

    <p>5x4M</p> Signup and view all the answers

    What is the primary function of Remote Patching Equipment (RPE)?

    <p>To patch between the two 4-wire VF control circuits available on the OFC system</p> Signup and view all the answers

    Where should the Power plant room be located?

    <p>Outside the control office</p> Signup and view all the answers

    What is the size of the Maintainer Room?

    <p>5x4M</p> Signup and view all the answers

    What is the benefit of using VoIP-based train control communication system?

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

    What is the distance between the Controller room and the Maintainer Room?

    <p>4 Meters</p> Signup and view all the answers

    What are the three major components of VoIP-based TCCS?

    <p>Control Communication Network (CCN), HQ equipment/servers, and waystation equipment</p> Signup and view all the answers

    Why is it desirable to keep the Control Communication Network (CCN) logically separate from other networks?

    <p>For performance and security</p> Signup and view all the answers

    How many Controller rooms are there in the control office?

    <p>4</p> Signup and view all the answers

    What should be used as the routing protocol in VoIP-based TCCS?

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

    What is the purpose of the Test Room Equipment (TRE)?

    <p>For testing of control office equipment</p> Signup and view all the answers

    What should be designed to have sufficient OFC paths available?

    <p>Control Communication Network (CCN)</p> Signup and view all the answers

    Who is the chief officer in the control office?

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

    How should the equipment of VoIP-based TCCS be monitored?

    <p>Through an NMS and mobile dashboards</p> Signup and view all the answers

    What is the size of the Chief's room?

    <p>Not specified</p> Signup and view all the answers

    What is an important consideration for the VoIP-based TCCS?

    <p>It should be secure and easy to maintain</p> Signup and view all the answers

    What is the primary purpose of the Emergency Control system?

    <p>To provide a means of emergency communication between traction power controller and section controller</p> Signup and view all the answers

    At what interval are Emergency Sockets provided along the route?

    <p>1 Km (Max.)</p> Signup and view all the answers

    Where can Emergency Control be dispensed with specific approval of the Railway Board?

    <p>Wherever any other form of emergency communication is commissioned and put into use</p> Signup and view all the answers

    What type of equipment can be utilized for emergency wireless communication in sections where such system exists?

    <p>Handsets for Mobile Train Radio Communication (MTRC) and Handsets for Cellular Mobile Communication</p> Signup and view all the answers

    What is the requirement for Train Control systems?

    <p>Facilities should be provided to section controllers for selectively calling one or a group of stations or all stations</p> Signup and view all the answers

    Where are Emergency Sockets also provided?

    <p>At major bridges, FP/SP/SSPs, isolators in yards, and LC gates</p> Signup and view all the answers

    What type of approval is required to dispense with Emergency Control?

    <p>Specific approval of the Railway Board</p> Signup and view all the answers

    What is the purpose of Emergency Control?

    <p>To establish communication between train crew and section controller in case of emergency</p> Signup and view all the answers

    Study Notes

    Control Communication Equipment

    • Push buttons or soft keys/tabs/buttons should be provided for selective calling of any station by the controller.
    • Station masters should lift their control phone and directly talk to the section controller with no dialing or minimum dialing.
    • The control phone should have a non-lockable type press-to-talk switch for enabling speech transmission of the station master to minimize background noise while in listening-only mode.

    Signalling and Calling Features

    • Means should be provided to automatically inform the section controller whenever the bell/buzzer at the station rings in response to the call initiated by him.
    • The signalling used for selective calling should not hamper normal telephone conversation on the line.
    • Feature of prolonged ringing of any way-station should be provided.

    Equipment Requirements

    • The equipment should be rugged and capable of intensive use.
    • The equipment should work satisfactorily within allowable margins of line characteristics without frequent critical adjustments.
    • The system should be capable of progressive expansion without any replacement.
    • Earth return circuits should not be retained on AC traction, and all Telecom circuits should work on metallic return or OFC.

    CCEO System

    • CCEO (Control Communication Equipment for OFC) is an advanced equipment connected to traditional control communication system on OFC.
    • The main equipment is kept in OFC hut itself and it works only on standard telecom supply (-48 V DC).

    Intercommunication Equipment

    • All controllers in a control office should be provided with an intercommunication system covering local requirements with facilities for each controller to call any other controller.

    DTMF Calling System

    • This system is used for train traffic control equipment with voice frequency signaling using Dual Tone Multi Frequency(DTMF) signals for 4 Wire and 2 Wire operation.
    • The control office equipment consists of an operating console with DTMF code generator and voice communication equipment.

    Controllers Equipment

    • The operating console with code generator has facilities like standard 16 key DTMF Key Pad, station group code buttons, and special push buttons for general call, extending long ring, repeating last transmitted station code, and resetting the system.

    Way Station Equipment

    • The way station equipment shall consist of DTMF decoder, voice communication equipment, and 2-Wire/4-Wire desk type control telephone.

    Control Interruptions Procedure

    • As soon as interruption occurs, the Section controller on duty shall localize the faulty section with the help of the way station operating staff.
    • Telecom technical staff in the test room/control office and way-station may be called upon to assist in the localisation whenever any technical difficulty arises.

    Inspection Records and Reports

    • SSE/JE incharge of the control office shall keep a record of all interruptions on the control line as well as failure of way station and control office equipment.

    Emergency Control

    • Provided from selected points along the track route for establishing communication between train crew, traction and permanent way staff with traction power controller and section controller in non-RE area
    • Emergency sockets are provided at an interval of 1 Km (Max.) along the route
    • Also provided at FP/SP/SSPs, isolators in yards, LC gates, and both sides of major bridges
    • Can be dispensed with specific approval of the Railway Board wherever any other form of emergency communication (MTRC etc.) is commissioned and put into use

    Emergency Wireless Control Communication

    • Utilizes handsets for Mobile Train Radio Communication (MTRC) in sections
    • Utilizes handsets (Official or Private) for Cellular Mobile Communication in sections
    • Utilizes Walkie-Talkie sets in sections where VHF communication from train to control office has been provided in lieu of any physical medium or MTRC
    • Any other form of emergency wireless communication shall have specific approval of the Railway Board

    Train Traffic Control System

    • Facilities should be provided to section controllers for selectively calling one or a group of stations or all stations
    • Standard 16 key DTMF Key Pad for calling 99 stations with two push button operation
    • Station group code buttons A, B, C, D and some additional buttons (4)
    • Some buttons are used for Special Functions such as –
      • Push button (marked ‘G’) for general call for calling stations simultaneously
      • Push button LR for extending long ring at way stations
      • Special push button 'RT' - for repeating last transmitted station code
      • 'RS' - to reset the system
      • 'RC' - for row/column frequency check
      • 'DL' - for cancellation of code
    • Visual indications for “System O.K”, “Display of station code”, and “power ON” indication
    • Communication equipment consists of loudspeaker/microphone with amplifiers and hand micro telephone and controllers headset

    Way Station Equipment

    • Way station equipment shall consist of DTMF decoder which can be assigned any DTMF station code/group code selectable with DIP switches
    • Voice communication equipment and 2-Wire/4-Wire desk type control telephone

    CCEO System

    • Control Communication Equipment for OFC (CCEO) is an advanced equipment connected to traditional control communication system on OFC
    • Main equipment is kept in OFC hut itself and it works only on standard telecom supply (-48 V DC)
    • Components of the CCEO system –
      • Control Room Equipment (CRE)
      • Test Room Equipment (TRE)
      • Local Telephone Equipment (LTE)
      • Multi Telephone Way station Equipment (MTWE)
      • Three Way Amplifier (TWA)
      • Remote Patching Equipment (RPE)
    • Control Room Equipment (CRE) is provided on the controller’s desk
    • Test Room Equipment (TRE) is used for carrying out maintenance and testing functions on way station equipment
    • Local Telephone Equipment (LTE) is used to provide 20 local telephones at Head Quarter
    • Multi Telephone Way station Equipment (MTWE) is provided at every way station and it is connected to the VF channel from the PD Mux on OFC system by a 4-wire cable
    • Three Way Amplifier (TWA) is used when the number of telephones required at a way station is more than four
    • Two-Wire Dialing Control Telephone (TDCT) is connected to MTWE with a twisted pair having a loop resistance of less than 1200 Ohm
    • Remote Patching Equipment (RPE) is used to provide patching between the two 4-wire VF control circuits available on the OFC system

    VoIP based Train Control Communication System

    • VoIP Based TCCS is the latest among the various control communication systems being used in Indian Railways
    • Leverages open standard IP technology to provide control communication thereby reducing dependence on railway specific equipment/ technology
    • Provides the benefit of economy of scale and open market competition using common network infrastructure for voice, video, and data
    • Has three major components –
      • Control Communication network (CCN)
      • HQ equipment/servers for control communication
      • Waystation equipment including control phones
    • Control Communication Network (CCN) should be kept logically separate from other networks for performance and security
    • CCN should be designed using traditional IP components or can be designed as a L3 VPN on Railways MPLS/SDH infrastructure
    • OSPF shall be used as the routing protocol
    • All Equipment of VoIP based TCCS shall be monitored through an NMS and it is desirable to monitor through mobile dash-boards also
    • System should be secure, easy to configure, and maintain

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    Description

    This quiz covers the equipment requirements for railway communication systems, including push buttons and control phones. It also discusses the functionality of these devices, such as selective calling and speech transmission.

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