SMC Networks Barricade SMC7004VWBR V.2 - Manual (Page 74)

Troubleshooting
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D. The 10/100 LED does not light after a connection is made.
1. Check that the host computer and hub are both powered on.
2. Be sure the network cable is connected to both devices.
3. Verify that Category 5 cable is used if you are operating at
100 Mbps, and that the length of any cable does not exceed
100 m (328 ft).
4. Check the network card connections.
5. The 10BASE-T/100BASE-TX hub/switch port, network card,
or cable may be defective.