HP 10BASE-T Betriebsanweisung PDF herunterladen (Seite 21)

3-1

Troubleshooting

This chapter describes how to troubleshoot your stack of hubs. Note that if

you have a Management Module, you can troubleshoot your hubs using

software. See the Management Module manual for more information.

This chapter describes how to troubleshoot your hub using:

■ solutions to common problems

■ LEDs

■ diagnostic tests

Solutions to Common Problems

Most problems are caused by the following situations:

■ Incorrect Hub-to-Hub connections. In addition to Extender Cable

hub-to-hub connections, you used crossover cable, thin coax, or fiber

cable to make hub-to-hub connections. Remove Switching Hub-to-

Switching Hub connections other than the Extender Cable.

■ Loopback. Verify the Extender cable is not looped back to the same

hub:

■ Incorrect cable lengths. Maximum cable lengths are in the

HP Switching Hubs Installation Guide.

■ Bad cable or cable is not snug. Look for loose connections. If snug,

try a different cable.

■ Nonstandard cables. Miswired cables may cause numerous net-

work collisions, and can seriously impair network performance. Use

a new correctly wired cable or compare your cable to the cable in

appendix A, “Cables and Connectors” for pinouts and correct cable

wiring.

Incorrect Correct

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HP 10BASE-T Betriebsanweisung Seite 21