DCI Standards and Codes 3 — Questions and Answers
Question 1: According to ANSI/TIA-568, which cable category is the minimum required to support 10GBASE-T Ethernet over a 100-meter channel?
- Category 5e
- Category 6
- Category 6A (Correct answer)
- Category 7
Correct answer: Category 6A
Category 6A is the minimum standard required to support 10GBASE-T at the full 100-meter channel distance due to its alien crosstalk (ANEXT) specifications.
Question 2: The ISO/IEC 11801 standard is most comparable to which US standard?
- ANSI/TIA-568 (Correct answer)
- ANSI/TIA-569
- ANSI/TIA-607
- ANSI/TIA-758
Correct answer: ANSI/TIA-568
ISO/IEC 11801 is the international standard for generic cabling in customer premises, which is functionally comparable to the US ANSI/TIA-568 standard.
Question 3: What NEC classification is required for cabling installed in a plenum air-handling space?
- CMR (Riser)
- CM (General Purpose)
- CMP (Plenum) (Correct answer)
- CMX (Residential)
Correct answer: CMP (Plenum)
CMP-rated (Communications Multipurpose Plenum) cable is required in plenum spaces because it has low smoke and flame-spread characteristics.
Question 4: Under ANSI/TIA-568, a telecommunications outlet/connector (TO) must be installed no closer than what distance to a power outlet?
- 3 inches
- 6 inches (Correct answer)
- 12 inches
- No minimum specified
Correct answer: 6 inches
ANSI/TIA-568 recommends at least 6 inches of separation between telecommunications outlets and power outlets to reduce interference.
Question 5: Which ANSI/TIA standard covers the pathways and spaces (conduit, cable trays, etc.) for telecommunications infrastructure?
- ANSI/TIA-568.2-D
- ANSI/TIA-569-D (Correct answer)
- ANSI/TIA-606-C
- ANSI/TIA-607-C
Correct answer: ANSI/TIA-569-D
ANSI/TIA-569-D is the standard for commercial building telecommunications pathways and spaces, covering conduit, cable trays, and equipment rooms.
Question 6: According to the NEC, what is the maximum fill ratio permitted for conduit containing communications cables?
- 25%
- 40%
- 53%
- No fill ratio specified in NEC for comm cables (Correct answer)
Correct answer: No fill ratio specified in NEC for comm cables
The NEC does not specify conduit fill ratios for communications cables; ANSI/TIA-569 recommends 40% fill, but this is a design guideline, not an NEC code requirement.
Question 7: The ANSI/TIA-606-C standard addresses which aspect of telecommunications infrastructure?
- Cable performance testing
- Administration and labeling (Correct answer)
- Grounding and bonding
- Pathways and spaces
Correct answer: Administration and labeling
ANSI/TIA-606-C covers the administration standard for telecommunications infrastructure, including labeling, record-keeping, and documentation requirements.
DCI Standards and Codes 3
According to ANSI/TIA-568, which cable category is the minimum required to support 10GBASE-T Ethernet over a 100-meter channel?