A signal processing method, wherein the method is applied to a vectored digital subscriber line,Vectored DSL, system, and comprises: sending, by a network side device, a time domain equalization,TEQ, message, wherein the TEQ message carries parameter information required when customer-premises equipment performs TEQ processing on a received synchronization symbol, the network side device and the customer-premises equipment are connected by using a twisted pair, and the TEQ message is sent to the customer-premises equipment through the twisted pair; characterized by determining, by the customer-premises equipment based on a length information of the twisted pair, whether to perform the TEQ processing, and sending a feedback message to the network side device, wherein the feedback message indicates that the customer-premises equipment does not perform the TEQ processing on the received synchronization symbol, the feedback message further carries a clipped error sample for the network side device to perform channel estimation and crosstalk coefficient calculation, and the clipped error sample is error sample information on which the TEQ processing is not performed by the customer-premises equipment; receiving, by the network side device, the feedback message from the customer-premises equipment, and parsing, by the network side device, the received feedback message, and performing crosstalk cancellation after performing channel estimation and crosstalk coefficient calculation based on the clipped error sample: wherein the determining, based on a length information of the twisted pair, whether to perform the TEQ processing comprises: if a length of the twisted pair is greater than or equal to a preset threshold, the customer-premises equipment starts TEQ coefficient training and enables the TEQ processing; or if a length of the twisted pair is not greater than or equal to a preset threshold, the customer-premises equipment does not start the TEQ coefficient training. sending, by a network side device, a time domain equalization,TEQ, message, wherein the TEQ message carries parameter information required when customer-premises equipment performs TEQ processing on a received synchronization symbol, the network side device and the customer-premises equipment are connected by using a twisted pair, and the TEQ message is sent to the customer-premises equipment through the twisted pair; characterized by determining, by the customer-premises equipment based on a length information of the twisted pair, whether to perform the TEQ processing, and sending a feedback message to the network side device, wherein the feedback message indicates that the customer-premises equipment does not perform the TEQ processing on the received synchronization symbol, the feedback message further carries a clipped error sample for the network side device to perform channel estimation and crosstalk coefficient calculation, and the clipped error sample is error sample information on which the TEQ processing is not performed by the customer-premises equipment; receiving, by the network side device, the feedback message from the customer-premises equipment, and parsing, by the network side device, the received feedback message, and performing crosstalk cancellation after performing channel estimation and crosstalk coefficient calculation based on the clipped error sample: wherein the determining, based on a length information of the twisted pair, whether to perform the TEQ processing comprises: if a length of the twisted pair is greater than or equal to a preset threshold, the customer-premises equipment starts TEQ coefficient training and enables the TEQ processing; or if a length of the twisted pair is not greater than or equal to a preset threshold, the customer-premises equipment does not start the TEQ coefficient training.