Telecommunications Equipment
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Questions and Answers

What is the primary purpose of the push button marked 'G' in the Standard 16 key DTMF Key Pad?

  • Resetting the system
  • Repeating last transmitted station code
  • General call for calling stations simultaneously (correct)
  • Extending long ring at way stations

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

  • 1-Line hand micro telephone
  • 3-Line loudspeaker/microphone telephone
  • 2-Wire/4-Wire desk type control telephone (correct)
  • 4-Wire/2-Line desk type control telephone

    • What is the power supply requirement for the CCEO system?

  • +24 V DC and -12 V DC
  • Standard telecom supply (-48 V DC) only (correct)
  • -48 V DC and +12 V DC
  • AC power supply

    • What is the function of the 'RT' push button in the Standard 16 key DTMF Key Pad?

    <p>Repeating last transmitted station code</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>Resetting the system</p> Signup and view all the answers

    What is the component of the CCEO system located in the OFC hut itself?

    <p>Main equipment</p> Signup and view all the answers

    What is the type of amplifier used in the communication equipment?

    <p>Two Way Amplifier</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>Cancellation of code</p> Signup and view all the answers

    What is the maximum temporary period for overhead telecom alignment permission given by the local Railway administration?

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

    What is the primary purpose of provisioning multiple protection paths with route and service provider diversities?

    <p>To ensure high reliability of control communication circuits</p> Signup and view all the answers

    What is the benefit of having only one type of equipment in a control section?

    <p>Ease of maintenance and inventory management</p> Signup and view all the answers

    What is the purpose of supervisory facilities in a manual board?

    <p>To ensure the telephone connected to the exchange is disconnected from the control circuit after conversation</p> Signup and view all the answers

    What is the primary function of Dual Tone Multifrequency (DTMF) System?

    <p>To transmit two frequencies simultaneously for calling one or multiple stations</p> Signup and view all the answers

    What is the reason for ensuring only important officials have access to control circuits?

    <p>To prevent unauthorized access to control circuits</p> Signup and view all the answers

    What is the purpose of recording control communication with time stamps?

    <p>To keep a record of control communication for future reference</p> Signup and view all the answers

    What is the benefit of interconnecting a local telephone exchange with important control circuits?

    <p>To allow important officials to access control circuits with or without an operator's assistance</p> Signup and view all the answers

    What is the purpose of the adjustable bracket on the arm of the microphone?

    <p>To hold the microphone in place</p> Signup and view all the answers

    What is the recommended material for cable tray/rack(s)?

    <p>Longitudinal strips iron or angle iron with horizontal cross pieces of light material</p> Signup and view all the answers

    What should be checked during quarterly maintenance of DTMF signalling equipment?

    <p>The functioning of all station codes including special codes, and DTMF signalling code level</p> Signup and view all the answers

    What is the recommended location for cable tray/rack(s)?

    <p>In an accessible location with the shortest practicable runs between units</p> Signup and view all the answers

    What is the purpose of the volume control on the loudspeaker?

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

    What should be checked during monthly maintenance of way station equipment?

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

    What is the recommended load for testing DTMF signalling code level?

    <p>600 ohms</p> Signup and view all the answers

    What is the acceptable range for DTMF signalling code level?

    <p>Between 0 dBm to -7 dBm</p> Signup and view all the answers

    What is the primary function of the CCEO system?

    <p>To enable voice communication and signaling through quad cable</p> Signup and view all the answers

    What is the purpose of the hybrid attachment in control office equipment?

    <p>To convert 4 Wire operation to 2 Wire operation in control office equipment</p> Signup and view all the answers

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

    <p>It enables use of common infrastructure for voice and data services</p> Signup and view all the answers

    What is the function of the operating console with DTMF code generator in the control office equipment?

    <p>To provide voice frequency signaling using DTMF signals</p> Signup and view all the answers

    What is the purpose of the intercommunication system in a control office?

    <p>To facilitate communication between controllers in a control office</p> Signup and view all the answers

    What is the difference between 4 Wire and 2 Wire operation in way station equipment?

    <p>The way station equipment is different for 4 Wire and 2 Wire working</p> Signup and view all the answers

    What is the advantage of using DTMF calling system?

    <p>It enables voice frequency signaling using DTMF signals</p> Signup and view all the answers

    What is the primary function of the control office equipment?

    <p>To provide voice communication and signaling through an Optical Fibre Communication System</p> Signup and view all the answers

    What is the primary function of Control Room Equipment (CRE)?

    <p>Selectively calling any way station or any local telephone</p> Signup and view all the answers

    Where is Test Room Equipment (TRE) typically located?

    <p>In the test room</p> Signup and view all the answers

    What is the maximum number of local telephones provided by Local Telephone Equipment (LTE)?

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

    How many control telephones can be connected to a Multi Telephone Way Station Equipment (MTWE) unit?

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

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

    <p>To connect more than 4 control telephones at a way station</p> Signup and view all the answers

    What is the maximum capacity of a Multi Telephone Way Station Equipment (MTWE) unit?

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

    What is the type of cable used to connect a Multi Telephone Way Station Equipment (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 type of telephone instrument connected to a Multi Telephone Way Station Equipment (MTWE) unit?

    <p>Standard telephone instrument with a handset and a numeric dial</p> Signup and view all the answers

    Where should incoming line wires and underground cables be terminated?

    <p>In the test room</p> Signup and view all the answers

    What should be ensured while planning the entrance of cables into the building?

    <p>Avoiding damage due to proximity to water pipes, steam pipes, etc.</p> Signup and view all the answers

    What is a necessary provision in test rooms?

    <p>Fire-proof walls</p> Signup and view all the answers

    Why is it necessary to make test rooms dry and clear?

    <p>To prevent flooding in the basement</p> Signup and view all the answers

    What is necessary to protect vital telecom equipment in the test room and control office?

    <p>Fire detection and suppression systems</p> Signup and view all the answers

    Where should all line wires and communication cables be terminated?

    <p>In the test room</p> Signup and view all the answers

    What should be made available in the Test room and Control office?

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

    Why should test rooms be free from overhead piping?

    <p>To prevent accidents and fires</p> Signup and view all the answers

    What should be done with equipment producing noise during operation in the control office?

    <p>It should be located in a different room outside the control office.</p> Signup and view all the answers

    Where should batteries, especially secondary cells, be located?

    <p>In a separate room outside the control office</p> Signup and view all the answers

    Why should the test room be located close to the control office?

    <p>To enable the test room staff to attend to any fault promptly</p> Signup and view all the answers

    What should be considered when planning a control office?

    <p>Space required for future additions and alterations</p> Signup and view all the answers

    Why should wire runs to the controller's table be terminated on a terminal strip?

    <p>To provide a suitable place for termination</p> Signup and view all the answers

    Why should separate conduits or runways be provided for communication and high voltage electric wires?

    <p>To provide mechanical protection for cables and wires</p> Signup and view all the answers

    What should be included in the building specifications when constructing a control office?

    <p>Distributing systems for communication wires</p> Signup and view all the answers

    Why should facilities for provision of communication wire be made during construction of the building?

    <p>To enable concealment of cables and wires</p> Signup and view all the answers

    What is the primary function of the Local Telephone Equipment (LTE)?

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

    Where is the Control Room Equipment (CRE) typically located?

    <p>At the controller's desk.</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 maximum capacity of a Multi Telephone Way Station Equipment (MTWE) unit?

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

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

    <p>To enable more than 4 control telephones at a way station.</p> Signup and view all the answers

    What type of cable is used to connect a Multi Telephone Way Station Equipment (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 type of telephone instrument connected to a Multi Telephone Way Station Equipment (MTWE) unit?

    <p>Two-wire Dialing Control Telephone (TDCT) with a numeric dial.</p> Signup and view all the answers

    What is the typical location of the Multi Telephone Way Station Equipment (MTWE) unit?

    <p>At every way station.</p> Signup and view all the answers

    How often should the line loop resistance be measured?

    <p>Once every year</p> Signup and view all the answers

    What is the acceptable disparity between each limb of the loop resistance?

    <p>5% of normal calculated value</p> Signup and view all the answers

    What is the purpose of using a test set with an audio oscillator in periodic tests?

    <p>To give a variable output from -10 dB to +10 dB with reference to 1 milliwatt across 600 ohms</p> Signup and view all the answers

    What is the purpose of the test panel in the control office?

    <p>To facilitate independent testing of control circuits with way station equipment or control office equipment</p> Signup and view all the answers

    What is the purpose of the megger in the control office?

    <p>To carry out insulation tests on internal wiring and external lines</p> Signup and view all the answers

    How often should the protection path for Control Circuits of BSNL/RAILTEL be checked?

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

    What is the function of the test oscillator in the control office?

    <p>To carry out measurement of line transmission loss and equipment insertion loss</p> Signup and view all the answers

    What should be done to defects noticed during periodic tests?

    <p>Rectify them on the spot and retest</p> Signup and view all the answers

    Where should the results of periodic tests be recorded?

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

    Why is proper decoding of the set code of the equipment important?

    <p>To ensure correct actuation of buzzer/loudspeaker ring back and LED on the control telephone</p> Signup and view all the answers

    What is the purpose of cleaning and proper termination of wires on the terminals on the rosette and CT box?

    <p>To prevent equipment failure due to poor connections</p> Signup and view all the answers

    How often should joint testing of Long Haul network protection path with NOC (Railtel) be done?

    <p>Once every three months</p> Signup and view all the answers

    Why should circuits be periodically tested by the inspector incharge?

    <p>To check the condition of inside wiring in control offices and way-stations</p> Signup and view all the answers

    What is the benefit of having NMS along with associated equipment in the telecom control room?

    <p>To ease of operation, testing, and management</p> Signup and view all the answers

    What should be checked during maintenance of control office equipment?

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

    What is the purpose of the test oscillator with a dB meter?

    <p>To carry out measurement of line transmission loss and equipment insertion loss</p> Signup and view all the answers

    Study Notes

    Local Telephone Equipment (LTE)

    • Provides 20 local telephones at Head Quarter

    Multi Telephone Way Station Equipment (MTWE)

    • Provided at every way station
    • Connected to VF channel from PD Mux on OFC system by a 4-wire cable
    • Allows maximum 4 control telephones at a way station

    Three Way Amplifier (TWA)

    • Used when the number of telephones required at a way station is more than four
    • Allows one more MTWE to be provided at a way station

    Two-Wire Dialing Control Telephone (TDCT)

    • Standard telephone instrument with a handset and a numeric dial
    • Connected to MTWE with a twisted pair having a loop resistance of less than 1200 Ohm
    • Has a 16-key DTMF keypad for calling 99 stations with two push-button operation
    • Additional buttons for special functions:
      • Push button 'G' for general call for calling stations simultaneously
      • Push button LR for extending long ring at way stations
      • Push button 'RT' for repeating last transmitted station code
      • Push button 'RS' to reset the system
      • Push button 'RC' for row/column frequency check
      • Push button 'DL' for cancellation of code
    • Visual indications for "System O.K", "Display of station code", and "power ON" indication

    Control Room Equipment (CRE)

    • Provided on the controller's desk
    • Allows the controller to selectively call any way station or any local telephone, TDCT of any way station and speak to it

    Test Room Equipment (TRE)

    • Provided in the test room for carrying out maintenance and testing functions on way station equipment

    CCEO System

    • Advanced equipment connected to traditional control communication system on OFC
    • Main equipment kept in OFC hut itself
    • Works only on standard telecom supply (-48V DC)

    Way Station Equipment

    • Consists of DTMF decoder, voice communication equipment, and 2-wire/4-wire desk type control telephone
    • DTMF decoder can be assigned any DTMF station code/group code selectable with DIP switches

    Intercommunication Between Local Telephone and Control Circuit

    • Allows important officials served by the local telephone exchange to gain access to control circuits with or without the assistance of an operator
    • Interconnection shall not affect the performance of the control circuits from the point of view of signaling or speech

    Maintenance Instructions

    • DUAL TONE MULTI FREQUENCY CALLING SYSTEM:
      • CONTROL OFFICE EQUIPMENT:
        • Check proper functioning of group codes A, B, C, and D
        • Check long ring - LR, general call, and special purpose keys
        • Check all visual indications provided on equipment
      • WAY STATION EQUIPMENT:
        • Check proper functioning of all station codes including special codes
        • Check DTMF signaling code level between 0 dBm to -7 dBm across a load of 600 ohms
        • Check row/column DTMF frequency by pressing the 'RC' button and shall be within specified limits

    Local Telephone Equipment (LTE)

    • LTE provides 20 local telephones at Head Quarter.

    Multi Telephone Way station Equipment (MTWE)

    • MTWE is provided at every way station and connected to the VF channel from the PD Mux on OFC system by a 4-wire cable.
    • It allows connection of up to 4 control telephones at a way station.

    Three Way Amplifier (TWA)

    • TWA is used when more than 4 telephones are required at a way station, exceeding MTWE's capacity.
    • It enables connection of an additional MTWE at a way station.

    Two-Wire Dialing Control Telephone (TDCT)

    • TDCT is a standard telephone instrument with a handset and numeric dial.
    • Each TDCT is connected to MTWE with a twisted pair having a loop resistance of less than 1200 Ohm.

    Control Room Equipment (CRE)

    • CRE is provided on the controller's desk.
    • It enables the controller to selectively call any way station or local telephone, TDCT, of any way station and speak to it.

    Test Room Equipment (TRE)

    • TRE is provided in the test room for maintenance and testing functions on way station equipment.

    Control Office Layout

    • Equipment producing noise during operation should be located in a different room outside the control office.
    • Batteries, especially secondary cells, should be located in a separate room outside the control office.
    • The test room should be located close to the control office to enable prompt attention to faults.
    • The test room should have enough floor area to accommodate the test panel, maintenance spares, tables, and chairs for the maintenance staff.

    Inside Wiring in Control Office

    • Wire runs to the controller's table should be terminated on a terminal strip of approved type.
    • Separate conduits or runways should be provided for communication and high-voltage electric wires.
    • Mechanical protection should be provided for cables and wires to achieve trouble-free service.

    Testing of Control Circuits

    • Test panel should be installed in all control offices for the use of maintenance staff.
    • Test panel should facilitate disconnection of control office equipment, patching facilities, monitoring of circuits, and provision for a universal calling device.
    • Test oscillator with a dB meter should be provided to carry out measurement of line transmission loss and equipment insertion loss.
    • 100-volt megger should be provided to carry out insulation tests on internal wiring and external lines.

    Periodic Tests

    • Control circuits should be periodically tested to check the condition of inside wiring, external lines, and equipment.
    • Circuits transmission loss should be measured once every year.
    • Line loop resistance should also be measured once every year.
    • Results of tests should be entered in a register maintained at each sectional inspector's headquarters and in the office of DSTE/Sr.DSTE.
    • Any defects noticed during tests should be rectified on the spot and the circuit retested before proceeding with further tests.

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    Description

    This quiz covers various types of equipment used in telecommunications, including Local Telephone Equipment, Multi Telephone Way Station Equipment, and Three Way Amplifier.

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