An axle assembly having an axle housing and a bowl cover. The main body has a first section near a rear end thereof, a second section near a front end thereof, a connecting section between the first and second sections, a longitudinal rib extending from the first section to the second section via the connecting section. The legacy exchange is a reused Public Switched Telecommunication Network PSTN, whereby the gateway is relatively cheaper than dedicated gateways for NGN networks. the quality factor of the resonator can be very high. Different light color mixing is also achieved when more than one AC_LED with different colors are combined to use. The networked computing device is configured to process large aggregate collections of multi-hour or day signals received from the local computing device to yield diagnostically valuable physiological parameters of gastrointestinal smooth muscle electrical activity.