Allied Telesis DMC1000/100 Series Installation Manual page 55

Mini media converters
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DMC1000/100 Series Media Converters Installation Guide
Problem 5: Network performance between the twisted-pair port on the
media converter and an end node is slow.
Solution: Check the DUP/COL LED: if it is off and occasionally blinking,
there might be a duplex-mode mismatch between the port and the end
node. (Off indicates the port has not established a link, and blinking
indicates collisions.) 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, set the end node to auto-
negotiate speed and duplex.
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