Allied Telesis AT-AR2010V, Installation Manual

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Chapter 5: Troubleshooting
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a different cable. If the twisted pair port is able to establish a link,
then the problem is with the cable or the other network device.

Verify that the twisted pair cable does not exceed 100 meters (328
feet).
 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.
Problem 3 : Network performance between a twisted pair port on the
router and a network device is slow.
Solutions : There might be a duplex mode mismatch between the port and
the network device. This occurs when a twisted pair port using Auto-
Negotiation is connected to a device with a fixed duplex mode of full
duplex. If this is the cause of the problem, adjust the duplex mode of the
port on the network device or on the router so that both ports are using the
same duplex mode.
Problem 4 : A port’s Link/Activity LED is blinking.
Solutions : The link between the port and the network device is
intermittent. Try the following:
 Connect another network device with a different cable to the port. If
the Link LED remains steady on, then the problem is with the
original cable or the network device.