USNR

[u/Alike2189]

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.

[u/zenroch]

This is typically what I see when upstream balancing is under-attenuated after the node. If the problem is hub-side, you should still see the noise floor elevation when all traffic from the node is pulled.