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Chapter 3
Troubleshooting
This chapter includes some information on avoiding problems and general troubleshooting.
Verify that your DC supply voltage or AC-DC power adapter is within the required 12 to 48V
DC range and capable of supplying at least 5W of power.
IMPORTANT:
Do NOT exceed 48V or you will damage the switch.
Select Ethernet cables with specifications suitable for your application. In general, Ethernet
cables are categorized into unshielded twisted-pair (UTP) and shielded twisted-pair (STP)
types. Shielded cables are recommended. In general, category 3, 4, and 5 Ethernet cables
are suitable for systems with 10Mbps transmission speed. But for systems at 100Mbps,
you should only use Category 5 or better Ethernet cables. In addition, always make sure
that your cable length between devices does not exceed 100 meters (328 feet).
If the DC-IN power indicator (PWR) does not light when the power cord is plugged in, you
may have a faulty power cord. Check for loose power connections and power loss or power
surges at the AC power outlet. Verify that your AC-DC adapter is properly sized and
outputs the correct voltage under load. If you cannot resolve the problem, contact your local
dealer for assistance.
