Redriver and operation method thereof

A redriver comprising:

• a plurality of equalizers configured to improve a signal quality of different main channels of a signal transmission system;
• at least one auxiliary channel detector configured to detect level toggling of at least one auxiliary channel of the signal transmission system;
• and
• a control circuit coupled to the at least one auxiliary channel detector to receive an auxiliary channel detection result, and coupled to the equalizers, wherein,
• in response to the auxiliary channel detection result indicating that the at least one auxiliary channel is all at an unconnected level, the control circuit controls the equalizers to enter a disconnection phase, wherein the equalizers are turned off in the disconnection phase to save power;
• in response to the auxiliary channel detection result indicating that the at least one auxiliary channel changes from the unconnected level to a connected level, and a command form toggling event occurs in the at least one auxiliary channel, the control circuit controls the equalizers to enter a connected phase from the disconnection phase, wherein the equalizers are turned on in the connected phase;
• and
• in response to the auxiliary channel detection result indicating that the at least one auxiliary channel changes from the connected level to the unconnected level and reaches a first threshold duration, the control circuit controls the equalizers to return to the disconnection phase from the connected phase.