Web Management User Guide
9
4 Troubleshooting
This section is intended to help solve the most common issues with the PoE Switch.
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 obviously faulty connections. If they appear to be OK, make sure the
connections are fitted snugly. 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, and can seriously impair network performance. A cable tester is the recommended tool
for 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 for 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 is 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.
