D-Link DES-1004 - Manual (Page 27)

10/100 Fast Ethernet Switch User’s Guide
Identifying External Components
17
is connected to a respective port or the uplink port, the LED indicator
is OFF.
♦
Link/Act. These LED indicators are lighted up green when there is a
secure connection (or link) to a device at any of the ports. The LED
indicators blink green whenever there is reception or transmission
(i.e. Activity—Act) of data occurring at a port.
♦
FDX/Col. This LED indicator is green when a respective port is in
full duplex (FDX) mode. Otherwise, it is OFF for half duplex (HDX)
operations. It blinks yellow when collisions are occurring on the
respective port.