FGSW-2620VM User’s Manual
6. TROUBLESHOOTING
This section is intended to help you solve the most common problems on the managed switch.
6.1 Incorrect connections
The switch port can auto detect straight or crossover cable when you link switch with other Ethernet device. For the
RJ-45 connector should use correct UTP or STP cable, 10/100Mbps port use 2 pairs twisted cable. If the RJ-45
connector is not correct pin on right position then the link will fail. For fiber connection, please notice that fiber cable
mode and fiber module should be match.
6.1.1 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.
6.1.2 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.
6.1.3 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.
6.2 Diagnosing LED Indicators
The Switch can be easily monitored through panel indicators to assist in identifying problems, which 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 power outlet. IF you still cannot resolve the problem, contact your local dealer for assistance.
6.2.1 Cabling
RJ-45 ports: use unshielded twisted-pair (UTP) or shield twisted-pair (STP) cable for RJ-45 connections: 100
Ω
Category
3, 4 or 5 cable for 10Mbps connections or 100
Ω
Category 5 cable for 100Mbps connections. Also be sure that the length
of any twisted-pair connection does not exceed 100 meters (328 feet).
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