Troubleshooting 100MBit Ethernet
LED Indicators
Overview
The LED indicator shows the presence of Link Integrity, Data Traffic,
100Mbps operation, and 10Mbps operation for installation verifica-
tion and diagnostic purposes.
Link Integrity LED
The green Link Integrity (LI) LED indicates whether the link is con-
nected. If link integrity is not detected, there is a link failure and the
LI LED is off; the transmit and receive functions of the card are also
disabled.
Data Traffic LED
The amber Data Traffic (TX) LED indicates the activity (transmit data)
status of the controller card. The LED should blink when data packets
are being transmitted.
State
Description
On
Normal data packets are received or link integ-
rity is detected
Off
No unshielded twisted pair cable is connected
No power source to hub
Unshielded twisted-pair cable is faulty
Unshielded twisted-pair wire exceeds the rec-
ommended length
State
Description
Blinking
Data packets being transmitted
Off
Power off
No data packets being transmitted