A broadband communication system in which a central office is connected to a high speed network utilizes various LMDS architectures of the present invention to expand network capabilities. The detection device is adapted to be equipped on a circulation exercise device of a physical training equipment. A gas mixing tube, which works as a Venturi tube, is mounted on the base seat to inject gas into the base seat. The disclosure is also related to a flexographic printing apparatus comprising a feeding system for providing a flexographic ink, wherein the ink in a liquid state has a viscosity ranging from about 100 cps to about 4,000 cps, and the ink in a gel state has a measurable hardness.