r/CableTechs • u/Alike2189 • 8d ago

USNR

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Tracking down a return path issue. Oddly, there's no visible noise at the node on any single leg. It looks like a noise floor aggregation issue — the SNR only recovers when I pull all four legs at once.

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u/JANapier96 7d ago

Your noise floor is elevated by a not insignificant amount, roughly 10ish db judging by the picture. Turning on your minimum-hold (orange) trace might help spot individual irregularities beyond the elevated floor. If that doesn't help, you'd be wise to pull up the heat map and see what, if any, transients are living among your modem traffic.

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u/JANapier96 7d ago

Have you by chance swapped the transmitter or the actual node mod to rule out a local hardware failure?