In one exemplary embodiment of the present invention, a telescope stop assembly for a steering column having a jacket is provided. The compressing unit compresses a fluid by receiving the reciprocation force generated by the reciprocating motor. A base of the ceramic control valve is provided on a central horizontal line thereof with a cold water admission hole, and a hot water admission hole. The second end portions of the at least two light sources are adjacent to each other. Based on the replies from each of the remaining user devices, at least one of the user devices is selected to serve as a master device that provides connectivity to the shared access carrier system through which the other of the plurality of user devices transmit and receive data.