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FAULT AND MAINTENANCE OF MEDIA CONVERTERS 

Fault 
description 

Cause description 

Maintenance 

POWER 
LED Lamps 
are off   

Haven’t connected the power 
plug or not a valid connection   

Connect the power plug and make 
sure it is a valid connection 

Link/Act LED 
Lamp is off 

1.  Haven’t connected the 

electrical cables to the 
electrical port or not   
a valid connection 

Connect the electrical cables to the 
electrical port and make sure it’s a 
valid connection 

2.  Used the wrong electrical 

cables for electrical 
connection  

Use right type of electrical cables 
for electrical connection 

3.  Any fault with the NIC and 

the terminal of Ethernet   

To make sure the NIC and the 
terminal of Ethernet can work 
normally 

FX and 
FX-link/Act 
LED Lamps 
are off 

1.  There might be any fault with 

the terminal optical devices 

Check the terminal optical devices 
and the main fiber to see if they can 
work normally. If not, then maintain 
them  

2.  The optical fiber has broken 

down or the connection of 
optical fiber is not valid 

3.  The optical fiber is over-loss 

TX and FX 
LED Lamps 
are normal 
but the data 
can not be 
transmitted 

1.  The connection between 

optical fiber and devices is 
not valid, this will cause the 
TX power not strong enough 

1.  Check the fiber connectors and 

make sure the connection 
between optical fiber and 
devices is valid 

2.  The system get power just for 

a little moment or any 
changes for the network, 
these may cost a little time 
for media converters to adapt 

2.  If this option can still not work a 

long time after all installations, 
then stop the power supply, wait 
a little moment and try again 
with the power on 

 
 
 

Hereby Assmann Electronic GmbH, declares that the Declaration of Conformity is part of the 
shipping content. If the Declaration of Conformity is missing, you can request it by post under 
the below mentioned manufacturer address 
   

www.assmann.com

 

Assmann Electronic GmbH 
Auf dem Schüffel 3 
58513 Lüdenscheid 
Germany 

 

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