HP 12M Manual de instalación descargar pdf (Pagina 35)

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Troubleshooting

Basic Troubleshooting Tips

Troubleshooting

• 100Base-T topology rules: Be aware that the topology rules for

100Base-T networks are much more restrictive than for 10Base-T.

You may have to redo an existing 10Base-T topology for 100Base-T

products.

The HP 10/100 hubs operate as Class II hubs when being used for

100Base-T networking. Some basic Class II 100Base-T Hub rules are

as follows:

– The maximum segment length for a hub-to-end node connection

is 100 meters.

– At most one hub can be cascaded from any of the hub ports that

are operating at 100 Mbps.

– Do not mix Class I and Class II hubs when cascading.

– When cascading two hubs together, the maximum distance sepa-

rating them is 5 meters.

– You must use 100-ohm Category 5 UTP cable in the 100Base-T

installations.

See the card “Connectivity Rules for 100T Networks” included with

your hub for illustrations of these rules.

■ Full-duplex link to the hub. Regular hub ports, including the ports on

the HP 10/100 hubs, only operate in half-duplex mode. If the attached

device is running in full-duplex mode, it will cause a high number of late

collisions on the network, degrading performance for all nodes. The HP

10/100 hubs must not be connected to devices that are configured for full-

duplex operation.

■ Non-compatible Speed Configuration. For the Hub 12M and Hub 24M,

make sure that you have not configured any port to operate at a speed

that is not compatible with the attached device (10 Mbps or 100 Mbps).

■ Faulty or loose network cables. Look for loose or obviously faulty

connections. If they appear to be OK, try a different cable.

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HP 12M Manual de instalación Pagina 35