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VT-16P250WS / VT-24P370WS: 16 / 24 Port L2 Web Smart Ethernet PoE Switch
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 snug. If that
does not correct the problem, try a different cable.
Non-standard cables
Non-standard and miss 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 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 cables 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.
5
Getting Started
This chapter introduces the management interface of the switch.
7
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