Propagation Delay Skew Quiz
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Questions and Answers

What is the maximum limit for propagation delay skew expressed in microseconds?

  • 200ns
  • 500ns
  • 50ns (correct)
  • 100ns

    • What is the primary cause of delay skew in twisted-pair cables?

  • Alien crosstalk
  • DC Resistance Unbalance
  • Propagation delay
  • Twists per foot (lay lengths) (correct)

    • Which measurements are required for compliance of Category 6A systems, as identified by ANSI/TIA-568-C.2 and ANSI/TIA-1152?

  • Power sum crosstalk and Delay skew
  • Propagation delay skew and DC Resistance Unbalance
  • PS ANEXT and PS AACR-F (correct)
  • Alien crosstalk and DC Resistance Unbalance

    • What is the requirement for power sum crosstalk from the adjacent cable in comparison to the PSNEXT requirement of the single cable?

    <p>6 dB greater</p> Signup and view all the answers

    What must the DC parallel resistance between pairs not exceed to fully support IEEE 802.3bt (PoE++)?

    <p>7%</p> Signup and view all the answers

    What is alien crosstalk?

    <p>Noise coupling from one cable link to another</p> Signup and view all the answers

    What happens if delay skew is significant in a cable bundle?

    <p>Data transmitted over one wire pair arrives out of sync with data over another wire pair</p> Signup and view all the answers

    What does ANEXT stand for in the context of crosstalk?

    <p>Alien Near-End Crosstalk</p> Signup and view all the answers

    What is the purpose of identifying cables as Disturbers and Disturbed (Victim) in the context of ANEXT loss?

    <p>To determine the impact of noise coupling from other cables</p> Signup and view all the answers

    What is the requirement for the DC parallel resistance between pairs to fully support IEEE 802.3bt (PoE++)?

    <p>Not exceed the greater of 7% or 50 mΩ</p> Signup and view all the answers

    What does IEEE Std 802.3-2012 specify as the maximum DC resistance unbalance between conductors?

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

    What is the formula for calculating the DC resistance unbalance within a pair?

    <p>$\text{DC Resistance Unbalance} = \frac{|R_1 - R_2|}{R_{total}}$</p> Signup and view all the answers

    What is the DC resistance unbalance within a pair if $R_1 = 1.87 , \Omega$ and $R_2 = 1.85 , \Omega$?

    <p>0.02 $\Omega$</p> Signup and view all the answers

    What is the sum of the individual resistances of two conductors known as?

    <p>DC Loop Resistance</p> Signup and view all the answers

    What problem can resistance unbalance in a cabling channel cause?

    <p>Saturation in PSE transformers</p> Signup and view all the answers

    What is the maximum DC resistance unbalance between pairs as per the example?

    <p>0.11 $\Omega$</p> Signup and view all the answers

    What is the first step to calculate the parallel resistance of pair 1,2-3,6?

    <p>Measure the individual resistances of each wire</p> Signup and view all the answers

    What is the difference in DC resistance between two conductors if $R_1 = 2.5 , \Omega$ and $R_2 = 2.2 , \Omega$?

    <p>0.3 $\Omega$</p> Signup and view all the answers

    What is the total DC loop resistance if $R_1 = 3.2 , \Omega$ and $R_2 = 2.8 , \Omega$?

    <p>6.0 $\Omega$</p> Signup and view all the answers

    What could resistance unbalance result in, affecting Power over Ethernet (PoE) delivery?

    <p>Current imbalance</p> Signup and view all the answers

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