HP Fiber-Optic Hub Plus Guia do Utilizador descarregar pdf (Página 41)

Troubleshooting

Some of the hub console commands are used for the troubleshooting instructions in this

chapter. See “Console Connection” in chapter 2 for details on connecting to the console port.

See chapter 3, “Operation”, for details on the console commands.

This chapter describes these topics:

basic troubleshooting tips

diagnosing with the LEDs

diagnostic tests:

– testing the hub only

– testing the hub’s ports

– testing the links

– testing fiber-optic cabling

Basic Troubleshooting Tips

Make sure that you have a valid network topology. If you have trouble after a recent

change to the network, switch back to the previous topology. If you no longer have

trouble, the new topology is probably at fault. Topology faults may be due to excessive

cable lengths or excessive repeater delays between nodes. For configuration guidelines,

see the HP EtherTwist Technical Reference Guide (p/n 5091-3237E).

Make sure that the hub is plugged in and that cable connections are secure.

Make sure that “transmit” and “receive” fibers are correctly connected to the “Tx” and

“Rx” receptacles. Try switching them if the Port LED is OFF or FLASHING.

Troubleshooting 4-1

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HP Fiber-Optic Hub Plus Guia do Utilizador Página 41