What category/class of cabling does BICSI recommend for the MINIMUM performance level of horizontal balanced twisted-pair cabling?

Question

Options

• ACategory 5e/class D
• BCategory 6/class E
• CCategory 6A/class EA
• DCategory 7/class F

• A
  6% (3)
• B
  81% (43)
• C
  2% (1)
• D
  11% (6)

Explanation

BICSI (Building Industry Consulting Service International) recommends Category 6/Class E as the minimum performance standard for horizontal balanced twisted-pair cabling in its TDMM (Telecommunications Distribution Methods Manual), recognizing that Cat 6 supports Gigabit Ethernet and provides headroom for emerging applications that Cat 5e cannot reliably sustain.

Why the distractors are wrong:

• A (Cat 5e/Class D): Cat 5e was the previous baseline and remains widely deployed, but BICSI has moved the minimum recommendation upward due to increasing bandwidth demands - it's no longer the floor.
• C (Cat 6A/Class EA): Cat 6A is actually BICSI's recommended (preferred) standard for new installations, supporting 10GbE to 100m - but the question asks for the minimum, not the preferred.
• D (Cat 7/Class F): Cat 7 uses shielded cabling and non-standard connectors; it's a higher-tier option not referenced as BICSI's minimum baseline for typical horizontal runs.

Memory tip: Think of it as a two-tier BICSI ladder - 6 is the floor (minimum), 6A is the ceiling (recommended). The "A" in 6A = "Above and beyond the minimum." If you can remember that Cat 6A is the preferred standard, you can work backwards to identify Cat 6 as the minimum.

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