POWER This indicator lights green when the Switch is receiving power,otherwise, it is off.
Link/Act. These LED indicators are lighted up when there is a secureconnection (or link) to any ports. The LED indicators blink wheneverthere is reception or transmission (i.e. Activity–Act) of data occurring at aport.
100Mbps. These LED indicators are lighted up when there is a secure connection (or link) to 100Mbps Fast Ethernet device at any of the ports.