HP 24S Guia do Utilizador descarregar pdf (Página 48)

Basic Troubleshooting Tips (continued)

If the ThinLAN port is not being used, make sure that Thinwatch is disabled.

(If Thinwatch is enabled on an unused ThinLAN port, the hub will operate but the

Fault LED will flash.) Use the console’s Thinwatch command.

Make sure link beat is set correctly on each twisted-pair port. See “Link Beat” in

chapter 1. (If link beat is set incorrectly, it may cause intermittent flashing of the

port’s LED on the hub and poor network performance for the device connected to

the port.) Use the console’s Status command to check link beat status and the

Linkbeat command to turn link beat on or off.

If a transceiver is connected to the AUI port of the hub, make sure its switches are

correctly set according to its instructions. Make sure the SQE test is disabled.

If the console port does not work, see “Console Connection” in chapter 2.

For the HP 28688B and HP 28699A only, if you are using IP communications,

make sure your IP configuration parameters are set correctly. Use the console’s

IPconfig command.

Check LEDs. For descriptions, see “Back of the Hub” in chapter 1. When power

is cycled, all LEDs should go ON momentarily and then go into their normal

operational states. If all LEDs do not go ON, an LED may be burned out, or the

hub is faulty and must be replaced. Whenever you suspect a burned-out LED,

cycle power by unplugging the hub and then plugging it in; then check the LEDs

immediately. When the hub is operating, LED patterns that indicate a hub or

network problem are shown in the table on the next page.

4-2 Troubleshooting

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HP 24S Guia do Utilizador Página 48