Techniques to efficiently broadcast position location data from a base station to a number of terminals. The plurality of contacts includes a first set of external contacts formed at the first major side and a second set of external contacts formed at the second major side. A demarcation device is coupled with the antenna converts inbound voice communications from the wireless protocol to a wired format and converts outbound voice communications from the wired format to the wireless protocol. The first lens group includes a reflecting optical element that bends the optical path. Through the scheme of the present invention, position of the physical channel resource occupied by the MBS-MAP message corresponding to multicast service can be determined, and various specific positioning measures are provided thereof. Metal-containing fine particles with their surface coated with at least two dispersants having different vaporization temperatures.