Tripp-Lite U205-004-R Manual Del Usario página 5

Overcurrent
An unlit port LED indicates a problem has been detected and the
port has been deactivated. Disconnect the device connected to the
Port. The Port will unlock only when the HUB is shut down and
restarted. Try reconnecting the device. If the port LED turns off
again, have the device checked.
Specifications
Function
Upstream Ports (Root Ports) 1
Downstream Ports 4
LEDs 1 Self-Powered
4 Downstream Status / Overcurrent
Detection
Per-Port Output Voltage DC + 5V
Per-Port Output Current 500mA(max.)
5
Description