EOC Study 3c251 P2

91 Questions | Total Attempts: 34

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Study Quizzes & Trivia

Other part of the ures.


Questions and Answers
  • 1. 
    Stress patterns are used mainly to identify malfunctioning T-1 transmission equipment and 
    • A. 

      Improper line voltages

    • B. 

      Inadequately simulated data

    • C. 

      Equipment speed limitations

    • D. 

      Misoptioned network equipment

  • 2. 
    For circuits that use binary with B8ZS coding, which stress pattern test for T-1 circuits is useful for stressing the minimum ones density?
    • A. 

      1-in-7

    • B. 

      2-in-8

    • C. 

      3-in-24

    • D. 

      Quasi-random signal source (QRSS)

  • 3. 
    In most cases, the signal level for commercial data circuits is between
    • A. 

      0 and -10 dBm0

    • B. 

      -10 and -13 dBm0

    • C. 

      -18 and -22 dBm0

    • D. 

      -20 and -24 dBm0

  • 4. 
    Which digital test is categorized as either controlled or uncontrolled?
    • A. 

      All ones

    • B. 

      Frame loss

    • C. 

      Excess zeros

    • D. 

      Timing slips

  • 5. 
    During a 45-minute BERT, the number of frame errors for a T-1 superframe circuit should be less than
    • A. 

      7

    • B. 

      15

    • C. 

      21

    • D. 

      30

  • 6. 
    When T-1 equipment receives no input signal, what is transmitted to keep the repeaters operating  and to maintain timing?
    • A. 

      Nothing

    • B. 

      An all ones pattern

    • C. 

      An all zeros pattern

    • D. 

      A pseudo-random pattern

  • 7. 
    Of the four main causes of T-1 impairments, cross talk is an example of
    • A. 

      Data specific

    • B. 

      Faulty equipment

    • C. 

      Improper connections

    • D. 

      Environmental factors

  • 8. 
    Which T-1 impairment is sometimes the hardest to isolate?
    • A. 

      A data specific

    • B. 

      Faulty equipment

    • C. 

      Improper connection

    • D. 

      Environmental factor

  • 9. 
    On T-1 circuit, dribbling errors are often caused by
    • A. 

      Data specific

    • B. 

      Faulty equipment

    • C. 

      Improper connections

    • D. 

      Environmental factors

  • 10. 
    What can result from an impedance mismatch?
    • A. 

      Impulse noise

    • B. 

      High circuit noise

    • C. 

      Envelope delay distortion

    • D. 

      Excessive loss of signal power

  • 11. 
    In any given system configuration employing two or more transmission control terminals, how many terminals have full monitoring and control capability?
    • A. 

      One

    • B. 

      Two

    • C. 

      Three

    • D. 

      Four

  • 12. 
    The capabilities of a transmission control (TRANCOM) system are a key factor in
    • A. 

      Eliminating hazardous continuous

    • B. 

      Requiring only slave terminals to operate.

    • C. 

      Being able to establish more unmanned sites.

    • D. 

      Removing maintenance support at DII sites

  • 13. 
    Which do you not rely on as a fault isolation aid?
    • A. 

      Operational adjustments

    • B. 

      Customer complaints

    • C. 

      Intercommunications

    • D. 

      Test facilities

  • 14. 
    Diagrams that are useful in circuit-rerouting and fault-isolation because they show transmission facilities, routing, composition, and capacity describe what type of fault isolation aid?
    • A. 

      Cabling records

    • B. 

      Written procedures

    • C. 

      System/network configuration plans

    • D. 

      Ready reference charts and placards

  • 15. 
    Records that are maintained by telephone systems personnel and are useful for fault isolation describe what type of fault isolation aid?
    • A. 

      Written procedures

    • B. 

      System and network plans

    • C. 

      Plant cabling cross reference files

    • D. 

      Ready reference charts and placards

  • 16. 
    What is the first thing you do when you find that a single channel of a T-1 is unusable or deteriorated?
    • A. 

      Coordinate the repair or alignment

    • B. 

      Make the appropriate replacement of equipment

    • C. 

      Make the appropriate test to ensure proper operation of the circuit

    • D. 

      Coordinate to transfer service to a spare channel or preempt a lower priority user.

  • 17. 
    Where does the transmit output signal of the modem to the distant end station first appear on the patch bay?
    • A. 

      The send equipment jack of the audio patch bay

    • B. 

      The equipment module of the digital patch bay.

    • C. 

      The receive line jack of the audio patch bay.

    • D. 

      The line module of the digital patch bay.

  • 18. 
    Where does the output signal of the modem to the router first appear on the patch bay?
    • A. 

      The send equipment jack of the audio patch bay.

    • B. 

      The equipment module of the digital patch bay.

    • C. 

      The receive line jack of the audio patch bay.

    • D. 

      The line module of the digital patch bay.

  • 19. 
    Which career field installs and maintains fixed and transportable low-frequency and high-frequency transmitters, receivers, and transceivers?
    • A. 

      Communications cable and antenna systems

    • B. 

      Satellite, wideband and telemetry systems.

    • C. 

      Ground radio communications.

    • D. 

      Telephone systems.

  • 20. 
    What device is a combination transmitter/receiver in a single package?
    • A. 

      A transceiver

    • B. 

      A repeater

    • C. 

      A router

    • D. 

      A hub

  • 21. 
    What device operates at the Physical layer of the open system interconnection (OSI) model and is used in Ethernet networks to connect which device to a fiber or copper cable?
    • A. 

      A transceiver

    • B. 

      Gateway

    • C. 

      Router

    • D. 

      Switch

  • 22. 
    What device provides the physical, electrical, and electronic connections to the network media?
    • A. 

      Bridge

    • B. 

      Router

    • C. 

      Gateway

    • D. 

      Network Interface Card

  • 23. 
    What layers of the OSI model do NIC belong?
    • A. 

      Data Link and Network layer

    • B. 

      Physical layer and Network layer

    • C. 

      Physical Layer and Data Link later

    • D. 

      Physical, Data Link, Network layer.

  • 24. 
    The device that receives a digital signal and regenerates the signal along the next leg of the medium is a
    • A. 

      Bridge

    • B. 

      Brouter

    • C. 

      Gateway

    • D. 

      Repeater

  • 25. 
    A repeater with more than one output port is a
    • A. 

      Hub

    • B. 

      Bridge

    • C. 

      Brouter

    • D. 

      Gateway

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