An apparatus includes a pump, a motor operatively coupled to the pump, and a flushing system. The device is based on the use of an optical fiber having a free cantilevered end subject to movement due to inertial lag. The replacement content may be an alternative version of the control content differing from the control content in one or more alternative elements. Sensors along another axis produce a common mode signal when a wave on the antenna is polarized along a different axis of the sensors. The optical network terminal has a computer data port.