HP 175X - JetDirect Print Server User Manual page 57

10 or 100 Link Lights
Light Behavior
Off
On solid green
USB Light
Light Description
Behavior
Off USB is not operational. This is OK before the print server finishes starting up.
After startup completes, this could indicate a faulty print server.
On solid green USB is enabled and ready for use. This begins before the USB cable is connected.
Blinking Software fault occurred for the firmware. There is a valid USB device and
(green) connections, but the device is not supported. Make sure the attached device is a
printer.
Description
No network connection.
Network connection is established at 10 Mb/s or at 100Mb/s.