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LED Indicators
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FDX/Col LED
The FDX/Col (full duplex/collision) LED indicates when a port is in full
duplex (FDX) mode, or when two or more stations on the specific net-
work segment attempt to transmit packets simultaneously, causing a
packet collision.
∆ Note: This LED can display both green and yellow
colors (see Table 3-1).
∆ Note: Collisions are normal in Fast Ethernet networks.
Excessive collisions may indicate that your network is
congested.
Table 3-1 describes the possible status indications of the FDX/Col
LEDs.
Table 3-1 FDX/Collision LED status indicators
State Status
On (green)
Port is in full duplex (FDX) mode
Off
Port is in half duplex (HDX) mode
Blinking (yel-
low)
Two or more stations on the network are
attempting to transmit packets simultaneously to
the port, causing a collision
FRCH1Book Page 4 Thursday, September 25, 1997 11:23 AM