Patent ID: 8774256

Claim:
An apparatus comprising: a first transceiver at a central office (CO) configured to transmit a downstream signal to a second transceiver at a customer premise equipment (CPE) via a digital subscriber line (DSL); a crosstalk precoder coupled to the first transceiver at the CO; and a vectoring control entity (VCE) coupled to the crosstalk precoder to control the crosstalk precoder, wherein the first transceiver is further configured to receive a first error feedback signal from the second transceiver, wherein the first error feedback signal comprises a fixed value that indicates that content of the first error feedback signal is potentially corrupted by non-crosstalk noise, and wherein the VCE takes responsibility to restrict the crosstalk precoder from updating a precoding coefficient that corresponds to the first error feedback signal when the first error feedback signal comprises the fixed value that indicates that the content of the first error feedback signal is potentially corrupted by the non-crosstalk noise.