CPCT CPCT Structured Cabling Systems & Infrastructure 1 — Questions and Answers
Question 1: According to ANSI/TIA-568, what is the maximum allowable horizontal cable length from the telecommunications room to the work area outlet?
- 90 meters (Correct answer)
- 100 meters
- 70 meters
- 50 meters
Correct answer: 90 meters
TIA-568 limits the permanent link (horizontal cable) to 90 meters, leaving 10 meters for patch cords and equipment cords to form a 100-meter channel.
Question 2: What is the function of the Main Distribution Frame (MDF) in a structured cabling system?
- It serves as the central point where outside plant cabling, backbone cabling, and building entrances interconnect (Correct answer)
- It is only used for telephone cabling in older buildings
- It connects individual workstations directly to the internet
- It is the same as a work area outlet
Correct answer: It serves as the central point where outside plant cabling, backbone cabling, and building entrances interconnect
The MDF (Main Cross-Connect) is the top of the cabling hierarchy where OSP entrance facilities, campus backbone, and building backbone cables terminate and interconnect.
Question 3: How many pairs does a standard T568B-wired RJ45 patch cord use for 10/100BASE-T Ethernet?
- 2 pairs (4 conductors) (Correct answer)
- 4 pairs (8 conductors)
- 1 pair (2 conductors)
- 3 pairs (6 conductors)
Correct answer: 2 pairs (4 conductors)
10/100BASE-T Ethernet uses only 2 pairs (pins 1,2 for TX and pins 3,6 for RX) of the 4 available pairs in an RJ45 connector.
Question 4: What does ANSI/TIA-942 govern in the context of structured cabling?
- Data center telecommunications infrastructure, including cabling, space, and power (Correct answer)
- Residential telephone wiring standards
- Wireless access point placement in office buildings
- Outside plant underground conduit installations
Correct answer: Data center telecommunications infrastructure, including cabling, space, and power
ANSI/TIA-942 defines requirements for data center infrastructure including structured cabling topology, space/layout, power, and cooling for telecommunications facilities.
Question 5: In a structured cabling system, what is the purpose of a horizontal cross-connect (HC)?
- To interconnect horizontal cabling from the work area with backbone cabling in the telecommunications room (Correct answer)
- To connect the building to the outside plant network
- To provide power to IP phones via PoE
- To terminate fiber optic cables only
Correct answer: To interconnect horizontal cabling from the work area with backbone cabling in the telecommunications room
The horizontal cross-connect in the telecommunications room is where horizontal cables from work area outlets terminate and connect via patch cords to backbone cables or active equipment.
Question 6: Which TIA standard defines the color-coding and administration requirements for telecommunications infrastructure?
- ANSI/TIA-606 (Correct answer)
- ANSI/TIA-568
- ANSI/TIA-569
- ANSI/TIA-607
Correct answer: ANSI/TIA-606
ANSI/TIA-606 is the Administration Standard for telecommunications infrastructure, defining labeling, color-coding, records management, and documentation requirements.
CPCT CPCT Structured Cabling Systems & Infrastructure 1
According to ANSI/TIA-568, what is the maximum allowable horizontal cable length from the telecommunications room to the work area outlet?