3Com DUA1698 manual Indicated by LEDs contains a list of problems and suggested solutions

Solving Problems Indicated by LEDs 31

Solving Problems If the LEDs on the Switch indicate a problem, refer to Table 5 which

Indicated by LEDs contains a list of problems and suggested solutions.

Table 5 Problems indicated by LEDs

Problem Suggested Solution

A Power LED does not Check that the power cable is firmly connected to the

lightrelevant Switch unit and to the supply outlet. If the connection is secure and there is still no power, you may have a faulty power cord.

On powering-up, the Power/Self Test LED lights yellow and a Unit LED lights green

The relevant Switch unit has failed its Power On Self Test (POST) because of an internal problem. Contact your supplier for advice.

A link is connected and yet the Status LED for the port does not light

Check that:

■All connections are secure.

■The devices at both ends of the link are powered-up.

■The connection uses cross-over cable if you are linking a 10BASE-T or 100BASE-TX port with a device that is MDIX-only.

For information about solving problems when managing the Switch, refer to the Problem Solving chapter in the “SuperStack Switch Management Guide”.