Ingress cancellation
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Ingress cancellation is a nifty advanced PHY technology that digitally removes in-channel ingress. It won't do anything about out-of-channel ingress, but if a carrier pops up in the middle of the upstream data signal, ingress cancellation can remove the interfering carrier without causing packet loss. In fact, ingress cancellation works its magic such that it can remove one or more carriers that are higher in amplitude than the data signal! Ingress cancellation eventually will break if the in-channel ingress gets too high.
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