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This chapter is from the book

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."

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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?

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