Black Box LB9002A-ST-R2 manual Incorrect full- or half-duplex settings

Express Ethernet Switch

Transmission Problems

Symptom: Connections across a LAN switch are slow or unreliable.

Possible Problem

Solution

Incorrect full- or half-duplex settings

Exceeded cabling distance or misused cable

Bad adapter in attached device

Express Ethernet Switches are all equipped with auto-negotiation to communicate with other DTEs on the network for the best available performance.

1.Verify if the connected NIC is equipped with auto-negotiation (this is not the same as auto-sensing).

2.Change the DIP switch setting if available.

1.Ensure that the proper cable is in use and that the recommended distance is not exceeded. For information, refer to Table 9.

2.Check the cable distance using a cable tester or TDR. Verify that the cable lengths attached to the switch meet Ethernet/IEEE 802.3 specifications.

3.If the distance is out of specification, reduce the length of the cable or add a repeater, ensuring no more than four repeaters are attached.

Check the switch port statistics. If excessive errors are found, run the adapter card diagnostic utility to determine the problem.

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