3com 3CNJPSE24 Bedienungsanleitung PDF herunterladen (Seite 31)

Appendix C — Troubleshooting

Ethernet Power Supply User s Guide C-3

Problem Resolution

The "Port LED

on one port is

not lit and the

corresponding

end device does

not operate.

The Ethernet Power Supply did not detect

a connected end device and therefore the

port is not providing power. Verify that:

• The end device is Power Over LAN

enabled.

• You are using a standard UTP Category

5 cable, including all 8 wires (4 pairs).

• If an external splitter is in use, replace

it with a new splitter. Discard the

faulty splitter.

• You are not using a crossover twisted

pair wire.

• The end device is connected to the

Data & Power port (upper RJ-45

connector).

In addition, try to:

• Re-connect the same end device into

a different port on the same unit. If it

works, there is probably a faulty port

or RJ-45 connection.

• Bypass the long twisted pair cable

and bring the end device close to the

Ethernet Power Supply and connect

to one of the ports using a short

cable. If this works, there is probably

a faulty connection or short on the

long cable, or one bad RJ-45

connection along the line.

Connect the end device into a different

Ethernet Power Supply. If this works, the

Ethernet Power Supply is probably faulty.

Try to power it up again and verify a

correct power-up LED sequence.

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3com 3CNJPSE24 Bedienungsanleitung Seite 31