TROUBLESHOOTING
Incorrect Connections
Every port on this switch can automatically detect either straight or crossover cables when you link it with
other Ethernet devices but other devices may demand a specific cable type depending on the device. Choose
the appropriate cable to connect between the units. 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 correctly pinned then the link will fail.
Faulty or Loose Cables
Look for loose or faulty connections. If they appear to be OK, then make sure the connections are snug. If
that does not correct problem, try a different cable
Non-Standard Cables
Non-standard and mis-wired cables may cause numerous network collisions and other network problems, and
can seriously impair network performance. A cable tester is the recommended tool for any proper network
installation.
RJ-45 Ports
Use unshielded twisted-pair (UTP) or shield twisted-pair (STP) cable for
RJ-45 connections: 100Ω Category 3, 4 or 5 cable for 10Mbps connections, 100Ω
Category 5 cable for 100Mpbs connections, or 100Ω Category 5e/above cable for
1000Mbps connections. Also be sure that length of any twisted-pair connection does not exceed 100 meters
(328 feet). We suggest using Category 5e cable when connection to power a device.
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
To assist in identifying problems, the switch can be easily monitored through panel indicators, which describe
common problems the user may encounter and where the user can find possible solutions. If the LED display
detection isn’t correct, please unplug then plug in the cable again. If the power indicator does not light when
the power cord in plugged in, you may have a problem with the power outlet or power connections, power
losses, or surges at power outlet. If the problem still cannot be resolved, please contact the local dealer for
assistance.
