3Com 1100 manual Problem Suggested Solution

32CHAPTER 2: INSTALLING THE SWITCH

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

Indicated by LEDs contains a list of possible 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

An Expansion Module Status LED flashes yellow

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

An unrecognized Expansion Module or Matrix Module is installed into the relevant Switch unit. You may need to remove the Module, or upgrade the management software used by the Switch to a version that recognizes the Module. Contact your supplier for further advice.

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

The Packet LED for a 10BASE-T port is lit, but the Status LED for that port does not light

The Packet LED for an Expansion Module is flashing even though there is no external traffic on this link

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.

The 10BASE-T port is connected to a 10BASE-T/100BASE-TX port or a 100BASE-TX port. Do one of the following:

■If the 10BASE-T port is connected to a 10BASE-T/100BASE-TX port, enable auto-negotiation on the 10BASE-T/100BASE-TX port, or set the 10BASE-T/100BASE-TX port to 10Mbps.

■If the 10BASE-T port is connected to a 100BASE-TX port, move the 10BASE-T connection to a 100BASE-TX connection.

If you have a Matrix Module installed into your Switch, this is normal operation. Management software in the stack passes packets between units even if there is no other traffic activity.