HP 100BaseT Guide de l'utilisateur télécharger pdf (Page 121)

HP 100Base-T Hubs Installation and Reference Guide

Troubleshooting A-3

and plugging it back in again, or by resetting the power), the

port will try to reestablish communications with the attached

device via auto-negotiation. If auto-negotiation fails, then

communications are set to half duplex by default. Based on this

type of industry-standard connection policy, if you are using a

full-duplex device that does not support auto-negotiation,

communications can be easily lost (i.e., reset to the wrong

mode) whenever the attached device is reset or experiences a

power fluctuation. The best way to resolve this problem is to

upgrade these devices to versions which support auto-

negotiation.

Cabling

1. Verify that the cabling type is correct. Be sure all cable

connectors are securely seated in the required ports. Use

100

W Category 5 cable for all twisted-pair connections to

100Base-TX ports. Straight-through cable should be used

for all standard twisted-pair connections.

2. When cascading two devices using RJ-45 station ports at

both ends of the cable (i.e., not an

MDI port), make sure a

crossover cable is used. Crossover cable should only be used

when a cascade port is not available.

3. Make sure all devices are connected to the network.

Equipment may have been unintentionally disconnected from

the network.

LAN Adapters

Make sure the LAN adapters installed in workstations are

compatible and are in good working condition.

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HP 100BaseT Guide de l'utilisateur Page 121