| 摘要 |
PROBLEM TO BE SOLVED: To suppress reduction in a working environment because of noise of a blower. SOLUTION: Since the blowing quantity (rotational frequency) of the blower 11 is fixed in accordance with a set step (first step to fourth step), a network communication apparatus (switching hub) can reduce fluctuation of sound generated from the blower 11. Moreover, when a power supply amount of a power supply section 9 exceeds a maximum power supply amount according to the blowing quantity of the blower 11, a control unit 1 to be a power supply control means and a power supply control unit 10 stop power supply to a communication port 6, so that an atmospheric temperature in a housing 20 can be prevented from exceeding an upper limit of an operation temperature range of the switching hub. Consequently, reduction in the working environment due to noise of the blower 11 can be suppressed. COPYRIGHT: (C)2011,JPO&INPIT
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