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Link LED(Yellow): The Link LED is located on the left part of the port. It is
l
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.
State
Normal data packet are received or link-integrity pulse is detected.
On
l
When no twisted-pair connected.
l
When link test is disabled.
l
No power source into Hub.
l
Twisted-pair is faulty.
l
Off
Non 10Base-T or non 100Base-TX device connected at the other
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end of the twisted-pair.
A twisted-pair wire exceeds the recommended length(Maximum
l
length is 100 meters).
5. Hardware Installation
Description
M81E / M81DC2 / M812-FX Series User's Manual
Activity LED
(Green)
Link LED
(Yellow)
17
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