Troubleshooting

Diagnosing with the LEDs

Tip

 

 

Number

Problem

Solution

Troubleshooting

The network connection is not working properly.

Try the following procedures:

•For the indicated port, verify both ends of the cabling, at the switch and the connected device, are securely connected.

•Verify the connected device and switch are both powered on and operating correctly.

•Verify you have used the correct cable type for the connection.

–for any of the twisted-pair connections, in the default configuration (Auto), either a straight-through or a crossover cable can be used and the switch will automatically adjust its operation. See the “HP Auto-MDIX Feature” description on page B-6for more information.

Note: If the module configuration is changed to one of the fixed configuration options though (for example, 100-Full Duplex), then the port operates as MDI-X only and the correct type of cable must be used. in general, for connecting to an end node (MDI port), use straight-through cable; for connecting to MDI-X ports on hubs, other switches, and routers, use crossover cable.

–for fiber-optic connections, verify that the transmit port on the switch is connected to the receive port on the connected device, and the switch receive port is connected to the transmit port on the connected device, and that both devices are transmitting correctly.

•For a 1000 Mbps connection, verify the network cabling complies with the IEEE 802.3ab standard. The cable should be installed according to the ANSI/TIA/EIA- 568-A-5 specifications. Cable testing should comply with the stated limitations for Attenuation, Near-End Crosstalk, Far-End Crosstalk, Equal-Level Far-End Crosstalk (ELFEXT), Multiple Disturber ELFEXT, and Return Loss.

The cable verification must include all patch cables from any end devices, including the switch, to any patch panels in the cabling path.

•Verify the port has not been disabled through a switch configuration change.

You can use the console interface, or, if you have configured an IP address on the switch, use the web browser interface, or ProCurve Manager network management software to determine the state of the port and re-enable the port if necessary.

•Verify the switch port configuration matches the configuration of the attached device. For example, if the switch port is configured as “Auto”, the port on the attached device also MUST be configured as “Auto”. Depending on the port type, twisted-pair or fiber-optic, if the configurations don’t match, the results could be a very unreliable connection, or no link at all.

If the other procedures don’t resolve the problem, try using a different port or a different cable.

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