TRENDnet TE100-PIP - Manual (Page 10)

* There are three green LED indicators on the rear panel:
LEDs Description
Power Steady light confirms that the Print Server is
powered on.
LPT When it is blinking, the printer connected is
printing.
Link/Act Steady light confirms that the print server has a good
connection to your network.
When it is blinking (briefly dark), the print server is
receiving/ transmitting data from/to the network.