5. Hardware Installation
M81E / M81DC2 / M812-FX Series User’s Manual
17
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Link LED
(Yellow): The Link LED is located on the left part of the port. It is
associated with the RJ-45 phone jack to indicate whether the twisted pair link
connected. When there is no coming network data packet on the jack, the jack will
start to detect periodical link-integrity pulses which should be sent by the device
connected at the other end of the link, on the received pair of the twisted-pair
cable. If link-integrity pulse is not detected, there is a link failure and the Link LED
will be turned off and the transmit and receive functions of the jack will also be
disabled. Table shows all the status of the Link LED, it is useful as a trouble-
shooting aid. Match the activity of LED on the port with one of the status indicated
in the table.
Off
State
On
Description
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Normal data packet are received or link-integrity pulse is detected.
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When no twisted-pair connected.
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When link test is disabled.
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No power source into Hub.
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Twisted-pair is faulty.
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Non 10Base-T or non 100Base-TX device connected at the other
end of the twisted-pair.
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A twisted-pair wire exceeds the recommended length(Maximum
length is 100 meters).
Activity LED
(Green)
Link LED
(Yellow)
