3com 3C17300 Owner's Manual download pdf (Page 54)

54 CHAPTER 4: PROBLEM SOLVING

Solving Problems

Indicated by LEDs

If the LEDs on the Switch indicate a problem, refer to the list of suggested

solutions below.

The Power LED does not light

Check that the power cable is firmly connected to the Switch and to the

supply outlet. If the connection is secure and there is still no power, you

may have a faulty power cord or an internal fault. Firstly, check the power

cord by:

■ testing it in another device

■ connecting a working power cord to the ‘problem’ device

then contact your supplier for advice.

On powering-up, the Power/Self Test LED lights yellow

The Switch unit has failed its Power On Self Test (POST) because of an

internal problem. If a port has failed it’s POST, it’s LED will flash

green/yellow alternately to indicate that the port is disabled. Contact your

supplier for advice.

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

light

Check that:

■ The Switch and the device at the other end of the link (or cable) are

connected securely.

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

■ The quality of cable is satisfactory

■ Auto-negotiation settings are the same at both ends.

Auto-negotiation problems will occur with all ports where

auto-negotiation is disabled and incorrect cables are being used

(cross-over or straight).

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3com 3C17300 Owner's Manual Page 54