An example of an apparatus may include an input connection to receive a pulse-width-modulated signal. The pulse-width-modulated signal may control a speed of a fan. An output connection may provide a tachometer signal to indicate the speed of the fan. A controller may provide an identification signal via the output connection. The identification signal may be provided in response to receipt of a predetermined duty cycle via the pulse-width-modulated signal. The identification signal may provide an identification corresponding to the fan.