A method of determining reference signal received power by user equipment associated with a distributed antenna system may include detecting at least three different reference signals in one or more common reference signals that are associated with different antennas in the DAS. The mounting module includes positioning elements for precisely locating a processing chamber and a transport system that moves workpieces to and from the processing chamber. Trial solutions of the model calibration are generated by a genetic algorithm program. The second plug serves to connect the first plug. An opening is formed in the reflective housing corresponding to the emission plane of the light guide bar, and a reflecting flange is formed at one side of the opening.