Structured cabling: What is the maximum allowed length for horizontal cabling from the telecommunications closet (TC) to the wall outlet, excluding patch cords?

Introduction / Context:
Telecommunications standards (such as TIA/EIA-568) define channel and component lengths for structured cabling systems. The 'horizontal link' connects the telecommunications closet to the work area outlet and has a strict maximum to preserve performance at rated categories.

Given Data / Assumptions:

• We are discussing the permanent horizontal cabling segment (solid conductor) from TC to outlet.
• Patch cords at the closet and the workstation are additional components.
• Copper twisted-pair cabling standards are assumed.

Concept / Approach:
The standard channel length is typically 100 meters total = 90 meters horizontal + up to 10 meters of patch cords. The permanent link (horizontal) itself must not exceed 90 meters to ensure that insertion loss, crosstalk, and delay parameters remain within specification for the overall 100-meter channel.

Step-by-Step Solution:

Verification / Alternative check:
Review structured cabling guidelines: many design documents explicitly state 90 m permanent link plus 10 m patch cords.

Why Other Options Are Wrong:

• 3 m and 6 m are typical patch cord lengths, not horizontal run limits.
• 300 m far exceeds copper Ethernet standards and would violate attenuation limits.
• None of the above is incorrect since 90 m is correct.

Common Pitfalls:
Confusing total channel length (100 m) with the horizontal-only limit (90 m). Designers must budget patch length accordingly.

Final Answer:
90 meters