DCI Standards and Codes 5 — Questions and Answers
Question 1: In the ANSI/TIA cabling hierarchy, what term describes the main cross-connect that serves as the top level of the cabling infrastructure?
- Horizontal Cross-connect (HC)
- Intermediate Cross-connect (IC)
- Main Cross-connect (MC) (Correct answer)
- Building Distributor (BD)
Correct answer: Main Cross-connect (MC)
The Main Cross-connect (MC) is at the top of the ANSI/TIA structured cabling hierarchy, typically located in the main equipment room and connecting to the entrance facility.
Question 2: What is the maximum backbone cable distance between a main cross-connect and an intermediate cross-connect using multimode optical fiber per ANSI/TIA-568?
- 100 meters
- 300 meters
- 2000 meters (Correct answer)
- 3000 meters
Correct answer: 2000 meters
ANSI/TIA-568 allows up to 2000 meters between the MC and IC using multimode optical fiber for campus backbone applications.
Question 3: Which standard defines the performance specifications for Category 8 cabling designed for data center use?
- ANSI/TIA-568.2-D (Correct answer)
- ANSI/TIA-568-C.2-1
- ANSI/TIA-568.2-D Annex G
- ISO/IEC 11801-3
Correct answer: ANSI/TIA-568.2-D
ANSI/TIA-568.2-D includes Category 8 specifications, supporting 25GBASE-T and 40GBASE-T over a 30-meter channel for data center top-of-rack applications.
Question 4: When installing communications cabling, which NEC section prohibits running low-voltage communications cables in the same raceway as high-voltage power conductors?
- Article 300.11
- Article 800.133 (Correct answer)
- Article 110.3
- Article 725.136
Correct answer: Article 800.133
NEC Article 800.133 prohibits communications conductors from being placed in the same cable, raceway, or fitting with electric light, power, or Class 1 circuits.
Question 5: What does OSHA 29 CFR 1926.416 require that directly impacts telecommunications cable installers working on construction sites?
- Cable labeling procedures
- Protection from electrical hazards near exposed energized parts (Correct answer)
- Fiber optic splice documentation
- Fall protection for ladder use only
Correct answer: Protection from electrical hazards near exposed energized parts
OSHA 29 CFR 1926.416 requires workers to be protected from contact with exposed energized conductors, which applies when installers work near electrical systems.
Question 6: According to ANSI/TIA-568, how many telecommunications outlets must be provided at each work area as a minimum?
- One outlet with two ports
- Two outlets, each with one port
- One outlet with one port
- Two outlets, each with two ports (Correct answer)
Correct answer: Two outlets, each with two ports
ANSI/TIA-568 requires a minimum of two telecommunications outlets per work area, each with a minimum of two ports (one for voice, one for data).
Question 7: Which edition of NFPA 70 (NEC) introduced significant changes to how Class 2 and Class 3 circuit cabling is classified using a new cable routing assembly system?
- 2011 NEC
- 2014 NEC
- 2017 NEC (Correct answer)
- 2020 NEC
Correct answer: 2017 NEC
The 2017 NEC introduced the new cable routing assembly (CRA) classification system for Class 2/3 and communications cables, replacing many of the previous type designations.
DCI Standards and Codes 5
In the ANSI/TIA cabling hierarchy, what term describes the main cross-connect that serves as the top level of the cabling infrastructure?