- Standards
- Basic Cable Uses
- Test Parameters
- What Should Be Tested?
- Grounding and Shielding Cable
- Summary
- Chapter Review Questions
Chapter Review Questions
To aid in your comprehension of important concepts, the following questions are provided. Refer to this book's Introduction for a general legend that indicates the anticipated difficulty of each question. For answers to these review questions, see Appendix I, "Answers to Chapter Review Questions."
1. |
Which cable classifications are currently supported by the media standards? List both ISO and TIA cable types. |
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2. |
What is the minimum cable test standard that the cable test standard must meet to support 10GBASE-T? |
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3. |
In addition to general electrical safety, what is the primary concern for delivering power over twisted-pair cabling? |
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4. |
What types of cable fault does a wiremap test reveal? |
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5. |
What is the difference between a reversed pair and a transposed pair? |
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6. |
What is the difference between TIA/EIA-568-B and T568B? |
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7. |
What is the difference between T568A and T568B? |
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8. |
In addition to comparing wire insulation colors used for each pair at both ends of a cable, what test infers the presence a split pair? Name three test techniques. |
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9. |
What special type of Ethernet cable is created when T568A and T568B are used on the same cable? |
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10. |
Approximately how far does an Ethernet signal travel in 10 nanoseconds on a typical Ethernet cable? |
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11. |
Describe the principle or process behind a TDR measurement. |
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12. |
What is delay skew? |
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13. |
What does the attenuation test measure? |
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14. |
Up to approximately what frequency does insertion loss generally appear to be linear? |
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15. |
At what location along a typical cable is return loss most frequently introduced? |
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16. |
How is the influence of crosstalk typically reduced by the cable manufacturer? |
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17. |
What is the measurement difference between ACR and SNR? |
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18. |
How is NEXT different from FEXT? |
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19. |
If ACRF fails, where is the problem most likely to be found? |
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20. |
How is a power sum measurement different from the nonpower sum equivalent (such as NEXT and PSNEXT)? |
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21. |
What characteristic identifies Ethernet implementations where power sum measurements could be important? |
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22. |
How is alien crosstalk different from other forms of crosstalk, such as NEXT versus ANEXT? |
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23. |
What typically results from a change of impedance along a cable link? |
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24. |
How is impulse noise measured? |
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25. |
What measurement, other than DC resistance, would likely detect a DC resistance fault in a cable? |
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26. |
What is the difference between a permanent link and a channel link? |
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27. |
How low must current flowing over a cable shield be to avoid disrupting data communications? |