A fluorescent light fixture is suspended by a longitudinally extending trapezoidal pendant bracketstabilizer. A relation store may be used to store algebraic relations between data sets. The first opening has, on the second opening side of the first opening in a planar view, an arc portion which is formed to keep approximately equal distance from an outer edge portion of the second opening. The first antenna module is disposed in the mobile communication device at a first side close to the receiver, and is used to transceive data of a first wireless communication system or a second wireless communication system. In this way, distributed control function, OTDR procedures, and fiber monitoring is achieved, while trace acquisition from anywhere in the network becomes possible.