Hidden Ethernet Failures That Don’t Show Up in Speed Tests
We rely on speed tests like a doctor relies on a thermometer. It is the first tool we grab when the internet feels "sick." You open a browser, click "Go," and watch the needle spin. If the number comes back high—say, 900 Mbps on a Gigabit connection—you sigh in relief. The internet is fine. The problem must be Zoom, or the game server, or just a glitch. But here is the uncomfortable truth: A speed test is a very shallow diagnostic tool. It measures throughput (how much data can be pushed through the pipe in a short burst), but it completely ignores stability , latency , power delivery , and physical integrity . It is entirely possible to have a cable that passes a Gigabit speed test with flying colors but still causes your security cameras to reboot, your VoIP calls to sound robotic, and your file transfers to corrupt. These are "phantom" failures—issues that lurk beneath the surface of a simple bandwidth check. In this guide, we will uncover t...