Black Box LB9017A-R2 Manual De Usuario

Express Ethernet Switch 

19 

 

 

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

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 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.  

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.