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USB DIRECTOR/4-PORT HUB
5. Troubleshooting5.1 Power Problems
If an overcurrent condition of > 1⁄2amp is sensed at
a port by the hub, that port’s power will be limited
(< 1⁄10amp). The condition will be reported back to the
host, the host will shut off the port, and the port LED
will be off.
If a port LED is off, an overcurrent condition may exist
on that port and/or the port that has been turned off by
the host. To clear this condition, disconnect the device
causing the fault and reset the hub by unplugging and
replugging the uplink connection. All downstream
devices will be reset.
If the hub is self-powered, you should see the reset LED
come on while the host connection is disconnected. If
in self-powered mode, you can also unplug the power
connection and plug it back in to create a reset.
In bus-powered mode, if the hub has an overcurrent
condition or if the sum of the current being drawn by all
of the devices and the hub exceeds 1⁄2amp, the hub will
shut itself down and the uplink port red LED will turn