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Do USB hubs have power limits?

A USB’s electric current is allocated in units of 100 mA up to a maximum total of 500 mA per port. Therefore, a compliant bus powered hub can have no more than four downstream ports and cannot offer more than four 100 mA units of current in total to downstream devices (since the hub needs one unit for itself).

A USB’s electric current is allocated in units of 100 mA up to a maximum total of 500 mA per port. Therefore, a compliant bus powered hub can have no more than four downstream ports and cannot offer more than four 100 mA units of current in total to downstream devices (since the hub needs one unit for itself).

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