PLANET VC-102M - Manual (Page 12)

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Power Notice:
1.The device is a power-required device, it means, it will not work till it is
powered. If your networks should active all the time, please consider using
UPS (Uninterrupted Power Supply) for your device. It will prevent you from
network data loss or network downtime.
2.In some area, installing a surge suppression device may also help to protect
your converter from being damaged by unregulated surge or current to the
converter or the power adapter.