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Huawei WS331B Manual page 14

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If the device is not going to be used for an extended period of time, power it off, and remove
all cables connected to it.
If anything unusual occurs (for example, if the device emits smoke or any unusual sound or
smell), immediately stop using it, power it off, remove all cables connected to it, and contact
an authorized service center.
Do not trample, pull, or excessively bend any cable. Doing so may damage the cable, causing
the device to malfunction.
Before you clean or maintain the device, stop using it, stop all applications, and disconnect all
cables connected to it.
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