systems and methods are used to adjust , e . g ., reduce , current driving a transmitter , i . e ., to reduce transmitter power consumption , based on an actual value of a received signal from received along a cable . for example , this is very beneficial to an ethernet system where the received signal is attenuated by the lossy cable . in this case , the transmitter power consumption can be lowered during a normal application where data is transmitted and received through the cable .