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Copper practice questions

28 questions from the low voltage and structured cabling practice test.

Copper practice test

10 questions, graded as you go, with the reason for every answer. No sign-up.

What this covers

Sample questions

Which pair lands on pins 4 and 5 in both the T568A and the T568B wiring schemes?

  1. The blue pair
  2. The orange pair
  3. The green pair
  4. The brown pair
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A. The blue pair

The blue pair (pair 1) sits on the centre pins 4 and 5 in both schemes, and the brown pair is on 7 and 8 in both. Only the orange and green pairs change places between T568A and T568B.

Reference: ANSI/TIA-568 series, pin and pair assignments (T568A and T568B)

What is the only difference between the T568A and T568B pin assignments?

  1. The blue and brown pairs trade positions
  2. The blue and orange pairs trade positions
  3. The orange and green pairs trade positions
  4. The green and brown pairs trade positions
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C. The orange and green pairs trade positions

The two schemes are identical except that the green and orange pairs swap between pins 1-2 and pins 3-6. The blue pair (4-5) and brown pair (7-8) stay put in both.

Reference: ANSI/TIA-568 series, pin and pair assignments (T568A and T568B)

A technician terminates one end of a four-pair cable T568A and the other end T568B. For a 10/100 Mb/s Ethernet link, what has been built?

  1. A rollover cable
  2. A straight-through cable
  3. A crossover cable
  4. A split-pair cable
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C. A crossover cable

Wiring one end A and the other B swaps the pair on pins 1-2 with the pair on pins 3-6, which is a 10/100 crossover. A rollover cable reverses all eight pins end to end, and a split pair is a wiring fault in which conductors from two different pairs are combined.

Reference: ANSI/TIA-568 series, pin and pair assignments (T568A and T568B)

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