CPCT Cabling Standards & Installation Practices 3 — Questions and Answers
Question 1: What is the maximum horizontal cable distance from the telecommunications room to the work area outlet per TIA-568?
- 50 meters (164 ft)
- 90 meters (295 ft) (Correct answer)
- 100 meters (328 ft)
- 70 meters (230 ft)
Correct answer: 90 meters (295 ft)
TIA-568 specifies a maximum horizontal cable run of 90 meters (295 ft), leaving 10 meters for patch and equipment cords within the 100-meter channel limit.
Question 2: Which wire map fault occurs when a wire is connected to different pins at each end of the cable?
- Split pair
- Open
- Crossed pair
- Reversed pair (Correct answer)
Correct answer: Reversed pair
A reversed pair (also called transposed pair) occurs when the two wires of a pair are connected to opposite pins at one end compared to the other.
Question 3: Per TIA-568, what is the minimum number of telecommunications outlets required per work area?
- 1 outlet
- 2 outlets (Correct answer)
- 3 outlets
- 4 outlets
Correct answer: 2 outlets
TIA-568 requires a minimum of two telecommunications outlets per work area to support both voice and data services.
Question 4: What installation practice helps minimize alien crosstalk between adjacent Category 6A cables?
- Bundling cables tightly together with cable ties
- Maintaining manufacturer-specified spacing or using shielded cable (Correct answer)
- Installing cables in parallel runs as close as possible
- Removing cable jackets near connectors
Correct answer: Maintaining manufacturer-specified spacing or using shielded cable
Maintaining manufacturer-specified spacing between Cat 6A cables or using F/UTP (shielded) cable significantly reduces alien crosstalk.
Question 5: Which standard governs pathways and spaces for telecommunications in commercial buildings?
- ANSI/TIA-568
- ANSI/TIA-606
- ANSI/TIA-569 (Correct answer)
- ANSI/TIA-607
Correct answer: ANSI/TIA-569
ANSI/TIA-569 is the Pathways and Spaces Standard, covering conduit, cable trays, sleeves, and equipment rooms.
Question 6: When terminating a Category 6 jack, which practice is critical to maintain performance?
- Untwist pairs no more than 13 mm (0.5 in) from the point of termination (Correct answer)
- Untwist pairs at least 25 mm (1 in) from the termination
- Strip the jacket back 150 mm (6 in) before terminating
- Tighten cable ties directly over the termination point
Correct answer: Untwist pairs no more than 13 mm (0.5 in) from the point of termination
Maintaining pair twist as close as possible to the point of termination — no more than 13 mm (0.5 in) of untwist — is essential for Cat 6 performance.
Question 7: What does NEXT stand for in cable testing terminology?
- Network Exchange Transfer
- Near-End Crosstalk (Correct answer)
- Noise Elimination and Transmission
- Near-End Transmission
Correct answer: Near-End Crosstalk
NEXT (Near-End Crosstalk) measures the signal coupling from a transmitting pair to an adjacent pair, measured at the same end as the transmitter.
CPCT Cabling Standards & Installation Practices 3
What is the maximum horizontal cable distance from the telecommunications room to the work area outlet per TIA-568?