LevelOne FSW-1671 - Manual (Page 41)

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Troubleshooting
This section is intended to help the user solve the most common problems on the
FSW-1671 Web Smart Switch.
Incorrect connections
The switch port can auto-detect straight or crossover cable when the user links switch
with other Ethernet device. The RJ-45 connector should use correct UTP or STP cable.
10/100Mbps ports use 2 pairs twisted cable and Gigabit 1000T ports use 4 pairs twisted
cable. If the RJ-45 connector is not correctly pinned on right position then the link will
fail. For fiber connection, please notice that fiber cable mode should match the fiber
module
.
Faulty or loose cables
Look for loose or obviously faulty connections. If they appear to be OK, make sure
the connections are snug. If that does not correct the problem, try a different cable.
Non-standard cables
Non-standard and miss-wired cables may cause numerous network collisions and other
network problem, and can seriously impair network performance. A category 5-cable
tester is a recommended tool for every 100Base-T network installation.
Improper Network Topologies
It is important to make sure that users have a valid network topology. Common topology
faults include excessive cable length and too many repeaters (hubs) between end
nodes. In addition, the user should make sure that the network topology contains no
data path loops. Between any two ends nodes, there should be only one active cabling