Installation guide

4
Troubleshooting
LED Indicators
Overview
Each RJ-45 port on the hub has its own LED indicator to show the network
linking status. Three other LED indicators indicate power, collision and
receiving status. These lights are used for installation verification and diag-
nostic purposes.
PWR LED
The amber power LED lights when the hub is powered on.
Link Integrity LED
The green Link Integrity (LI) LED indicates whether the network link is
established. It shows the hubs response to the Link Integrity Test, as
required by the 10BASE-T standard. If link integrity is not detected, there is a
link failure and the LI LED will be off. The transmit and receive functions of
the adapter also will be disabled.
State Description
On • Link integrity is detected
• A good twisted-pair cable link exists
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 recommended
length
• Port has been partitioned
• Device on other end of UTP cable is not on or connected
properly