UNICOM Electric FEP-30109T-C-SM - Manual (Page 18)

Smart-Switch/801
17
Troubleshooting
This section helps solve the most common problems on the Smart-
Switch/801.
Incorrect connections
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 miswired cables may cause numerous network
collisions and other network problem and can seriously impair network
performance. A Category 5e cable tester is a recommended tool for
every 100Base-T network installation.
Improper Network Topologies
It is important to make sure that you have a valid network topology.
Common topology faults include excessive cable length and too many
repeaters ( hubs ) between end nodes. In addition, you should make sure
that your network topology contains no data path loops. Between any two
end nodes, there should be only one active cabling path at any one time.
Data path loops will cause broadcast storms that will severely impact
your network performance.