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Express Ethernet Switch
15
Transmission Problems
Symptom: Connections across a LAN switch are slow or unreliable.
Possible
Problem
Solution
Incorrect full- or
half-duplex
settings
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.
Exceeded cabling
distance or
misused cable
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 s
witch
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.
Bad adapter in
attached device
Check the switch port statistics.
If excessive errors are found, run the adapter card diagnostic utility to determine
the problem.