Why a channel certification beats a spec sheet

A datasheet tells you what a cable can do in a lab. A channel test tells you what your installed link actually does. Here is the difference that matters at handover.

A reel of Cat 6A is only a promise until it is in the wall, terminated, and tested as a channel. We walk through insertion loss, NEXT, and return loss, and why the as-built report is the document procurement should ask for.