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Express Ethernet Switch
18
Trouble-shooting Guide
This trouble-shooting guide describes problems that could occur with the Express Ethernet
Switch. The guide states possible reasons for the problems, and possible steps to take to
solve the problems.
No Power to the Switch.
Symptom: Power cord is connected to the switch, but all LEDs, including the Power LED,
are off.
Possible
Problem
Solution
Loose power
connection or
faulty power supply
1.
Check both ends of the power cord to make certain that they are securely connected to the power receptacle
on the switch and to the power outlet.
2. Verify that the power outlet has power.
No Connectivity to the Data Terminal Equipment.
Symptom: An Ethernet switch cannot communicate to the directly connected computers or
network segments.
Possible
Problem
Solution
Incorrect or faulty
cabling
1. Check cables for a secure connection.
2. Verify that the correct type of cable is in use.
?? For connection to a PC or a network interface card (NIC), use a straight-through cable.
?? For uplink to another switch or hub, use a cross-wire cable, or use a regular straight-through cable connect
ed
to the uplink port with the uplink button activated.
?? Refer to Table 9 for cable specifications.
1. Verify proper cable preparation.
2. Use a time domain reflectometer (TDR) or other cable-
checking device to verify that the cable has no opens,
shorts, or other problems.
3. Swap the cable with another of the same kind to see if the cable is bad.
?? Replace or fix the faulty cable as necessary.
Dysfunctional NIC
on a PC or
workstation
Run the diagnostic supplied by the vendor on the NIC to determine if it is functi
oning properly. If it is not, replace
it.
Packet Overflow or
Hardware problem
Reset the switch by pressing the reset button or turn the switch off, then on again.
No Connectivity to Certain Nodes on the Network
Symptom: Data terminal equipment (DTE) connected to the switch can not send or receive
information from certain segments on the same network or across to another LAN or WAN.
Possible
Problem
Solution
Hardware problem
Check for a damaged RJ-45 jack, or fiber SC or ST type connector.