5. Function Illustrations
M81E-X Series User’s Manual
17
!
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
!
Normal data packet are received or link-integrity pulse is detected.
!
When no twisted-pair connected.
!
When link test is disabled.
!
No power source into Hub.
!
Twisted-pair is faulty.
!
Non 10Base-T or non 100Base-TX device connected at the other
end of the twisted-pair.
!
A twisted-pair wire exceeds the recommended length(Maximum
length is 100 meters).
!
The RJ-45 port has two LED indicators which indicate the presence of station
Link and Activity status for installation verificaton and diagnostic purpose.
Activity LED
(Green)
Link LED
(Yellow)
