| 摘要 |
PURPOSE: A switch module for a mobile communication system is provided to supply one of doubly inputted reference clock signals to a repeater, thereby preventing communication failure. CONSTITUTION: A switch(240) outputs one of the first and second reference clock signals. A signal level sensing unit(230) compares the size of the first reference clock signal inputted to the first reference clock input unit(210) with a preset reference value. When the size of the first reference clock signal is smaller than the reference value, the switch generates a control signal for controlling output of the second reference clock signal.
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