UNICOM Electric SmartGST-2402M - Manual (Page 79)

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78
Troubleshooting
This section is intended to help you solve the most common problems on the
SmartGST-2402M.
Incorrect connections
■ Courtesy of Auto MDI/MDIX, The SmartGST-2402M can automatically detect
straight or crossover cables when you link to another Ethernet device. Use a
Category 5e greater UTP RJ-45 patch cord for 10/100Mbps Fast Ethernet and
1000T Gigabit. For a fiber connection, please note that the mode of both the fiber
cable and fiber module should match.
■ 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 problems that 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 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 ends nodes, there should be only one
active cabling path at any time. Data path loops will cause broadcast storms that will
severely impact your network performance.
Diagnosing LED Indicators
The Switch can be easily monitored through panel indicators to assist in identifying
problems. The list below describes common problems you may encounter and
where you can find possible solutions.
If the power indicator does turn on when the power cord is plugged in, you may
have a problem with power outlet or power cord. However, if the Switch powers off
after running for a while, check for loose power connections, power losses, or
surges at the power outlet. If you still cannot resolve the problem, contact your local
dealer for assistance.
■ Cabling
A. RJ-45 ports: Use Unshielded Twisted-Pair (UTP) or Shielded Twisted-Pair (