D-Link DES-5200 - Manual (Page 38)

Fast Ethernet Switching System User’s Guide
LEDs
31
Col
Col means collision. The Col LED is amber when collisions occur at the port.
Collisions are normal on the network. You should be concerned when a high
number of collisions happen at the port.
Table 8: 2-Port Tx Module LEDs
LED Lit Dark
100/10 (Speed)
(Green)
Port is set for 100 Mbps Port is set for 10 Mbps
Link (Link)
(Green)
Port is linked to another
device No link
FDX (Duplex Mode)
(Green)
Port is in full duplex Port is in half duplex
Tx (Transmission)
(Green)
Port is transmitting data Port is not transmitting data
Rx (Receiving)
(Green)
Data is being received at
the port Port is not receiving data
Col (Collision)
(Amber)
Collisions are occurring at
the port No collisions are occurring