D-Link DES-1008M - Manual (Page 18)

DES-1008M User’s Guide
8 Unpacking and Component Identification
♦
100M Indicator
This LED lights green when the port is operating at 100Mbps. If the
port is operating at 10Mbps, the speed indicator remains dark.
♦
Link/Act Indicator
This LED lights green when the port is connected to a powered-on
Ethernet/Fast Ethernet station. It blinks off briefly when information
is transmitted or received on the port. Please note that when the BNC
module is connected, the Link LED is not lit.
♦
FDX/Col Indicator
This LED lights green when the port is operating in 10/100BASE-T
full-duplex mode. When the Switch is not in full-duplex mode, the
indicator remains dark. If there is data collision on the segment
connected to the respective port, the indicator briefly blinks amber.
Packet collisions are not uncommon, and occur when two or more
devices attempt to transmit data simultaneously on a network. When a
collision occurs, devices pause then re-transmit after a somewhat
random wait period. Because wait periods vary among devices,
successive collisions become increasingly improbable.
If the port connects to another switch or hub, collision indicators of
these devices would indicate the same collision, since collisions span an
entire local area network.
The BNC port module also provides an additional LED indicator for
reporting on the status of the ports. For information about these
indicators, see Appendix C, Slide-in Port Modules.