A frequency-scalable device for interfacing a planar medium with a coaxial medium to propagate a primary signal, the device comprises a transition medium connectable between the coaxial medium and the planar medium. A first side rail and a second side rail are attached to the opposing longitudinal side edges and a front rail is attached to the front edge of the bottom skid. Each ASISP is capable of executing a subset of the functions of a communication protocol. In the depth first version, graph nodes are not FINISHED until all predecessors are FINISHED. The cap portion has an impermeable membrane substantially impermeable to the passage of reproductive cells, wherein when the implant portion is implanted into the uterine myometrium near the fallopian tube opening circumscribing the fallopian tube opening, the cap portion occludes the fallopian tube. In a particular embodiment, the tilt sensor system is incorporated into a park brake system including a park brake for securing a portion of a vehicle in a static condition, and a control system for actuating the park brake responsive to a tilt measurement from the tilt sensor system.