3com 3CNJPSE24 User Manual download pdf (Page 32)

Appendix C — Troubleshooting

C-4 Ethernet Power Supply User s Guide

Problem Resolution

The end device

operates, but

there is no data

link.

Verify that:

• The Port LED on the Ethernet Power

Supply front panel is lit continuously.

• The "Data" and "Data & Power" ports

correspond.

• If an external splitter is in use, replace

it with a new splitter. Discard the

faulty splitter.

• You are using a standard UTP

Category 5 cable, including all 8 wires

(4 pairs), and is 100m or less in

length between the switch and the

end device.

• You are not using any crossover

twisted pair wires.

• The Ethernet Power Supply is

connected to a switch or hub with a

good RJ-45 patch cord connection.

In addition, try to:

• 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.

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