High-Speed USB 2.0 Docking Station
Self-Power Mode vs Bus-Power Mode
Note that there are two modes of powering USB peripherals, self-power mode and
bus-power mode. The self-power mode means the peripheral has its own power adapter for
operation. Bus-power mode means the peripheral operates under the power from the
upstream port that it is connected to.
The USB 2.0 docking station can operate under both USB bus-power and self-power mode.
However, under bus-power mode, each downstream facing port of the docking station
cannot supply current for more than 100mA. Therefore, devices (e.g. USB scanner or
multi-function peripheral, MFP) with power demand higher than this value cannot function.
In this situation, it is recommended to operate this docking station under self-power mode
whenever possible. USB bus-power mode is only for low power consumption devices.
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