Allied Telesis AT-GS900/8E - Manual (Page 46)

Chapter 3: Troubleshooting
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ˆ Verify that the twisted pair cable is securely connected to the port on
the switch and to the port on the end node.
ˆ Ensure that the twisted pair cable does not exceed 100 meters (328
feet).
ˆ Verify that you are using the appropriate category of twisted pair cable:
Category 3 or better for 10 Mbps operation and Category 5 and
Category 5E for 100 and 1000 Mbps operation.
Note
A 1000Base connection may require five to ten seconds to establish
a link.