Max Express Ethernet Switch LB9217A-R2 & Applicable Modules
26
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.
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 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.
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