Recorded scope and limits
Test-equipment publisher article dated November 12, 2025 describing array polarity in practice. Establishes what distinguishes Methods A, B and C in the field: Method A uses straight-through trunks keyed up at one end and down at the other and moves the crossover into the patch cords, Method B uses reversed trunks keyed up at both ends, and Method C flips each pair within the trunk. Also states that the side of a link cannot reliably be told by looking, so polarity is confirmed by test. Describes practice rather than restating the standard, and closes with the publisher’s own product recommendation, which is not carried here. Checked September 16, 2026.
Use the task guides below to see how this source informs a labeling decision. Check the publication scope and the edition adopted by your project before applying it. A publisher overview is not the full text of a standard, and software documentation does not prescribe a physical label format.
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What this source establishes
Cited for the practical difference between the methods and for the statement that polarity is not readable from appearance. The standard itself, not this article, is the authority for the methods’ definitions.
Review date: 2026-09-16. This note describes the source scope; it is not a project approval.