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Troubleshooting
I've connected the cable but the left port LED (link) is off. Why?
• Try removing the cable and plugging it in again. Wait up to six seconds
for a link.
• Make sure you're using the right type of cable (straight-through or
crossover) for the device you want to connect to. If you're using the
wrong cable, the link LED will not come on.
• Make sure the device you've connected to a port is a 10Base-T or
100Base-TX device. The Express 330T Stackable Hubs don't support
100Base-T4 devices running at 100Mbps. However, they do support T4
devices running at 10Mbps.
• Check the speed and duplex settings on the PC's network adapter.
• The cable is defective.
The left LED is now blinking orange instead of green. Why?
The port is partitioned (auto-disabled). This condition is usually caused
by a malfunctioning network adapter or an overloaded network segment.
For more information, see page 4.
I keep getting an intermittent loss of link. Why?
• You may be using the wrong grade of cable. The wrong cable can cause
erratic performance and you may eventually lose the connection
between the port and the attached device.
• Make sure the device connected to the hub port is configured for
half-duplex operation. Hubs operate at half-duplex only.
• A cable segment somewhere in your collision domain may be too long.
Make sure none of your UTP cabling is longer than 100 meters.
• Make sure your stack contains no more than five hubs.
• Check the Ethernet cable pairs. The TX pairs (pins 1 and 2) and the RX
pairs (pins 3 and 4) should be twisted pairs. See diagram in page 13.
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