IOGear GMFPSU22W6 - Manual (Page 8)

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Indicator Behavior Description
Power Lit Power On
Not lit Power off/System error
Link Lit Network connected
Not Lit No physical connection to network
Status Blinking Activity on network
Not lit No activity on network
USB Lit USB device connected
Blinking Connected USB device error
Not lit No physical connection to USB device
USB2 Lit USB device connected
Blinking Connected USB device error
Not lit No physical connection to USB device