HP Fiber-Optic Hub Plus User's Guide download pdf (Page 42)

Basic Troubleshooting Tips (continued)

Make sure that fiber-optic cables are of the correct type: 62.5/125 µm or 50/125 µm.

If the ThinLAN port is being used, make sure that the port is properly terminated. See

“ThinLAN Port Connection” in chapter 2.

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.

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.

If you are using IP communications, make sure that your IP configuration parameters

are correctly set. 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 the 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

1 2 ... 37 38 39 40 41 42 43 44 45 46 47 ... 83 84

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HP Fiber-Optic Hub Plus User's Guide Page 42