ZyXEL Communications PLA-4xx Series User Manual

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Chapter 5 LEDs and Troubleshooting
PLA-4xx Series User’s Guide
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The PLA-4xx Series Configuration Utility does not display all or any of my 
devices.
• Inspect the LEDs on your PLA-4xx and make sure that the ETHERNET and LINK LEDs 
are on or blinking. See 
 for troubleshooting LED related problems.
• Check all ZyxEL HomePlug AV devices on your network have the latest firmware 
installed. The latest utility cannot communicate with PLA-4xxs using earlier versions of 
the firmware. Go to 
 for instructions on installing the latest 
firmware.
• Check you are using the latest version utility. Earlier version utilities cannot communicate 
with PLA-4xxs using the latest firmware. If you do not have the latest utility, download it 
from the ZyXEL website.
5.4  Powerline Problems
V
The signal on my powerline network is weak.
Your powerline adapters may be connected to electrical surge protectors. Connect them 
to standard power outlets.
Your powerline adapters may be located close to large appliances such as refrigerators or 
air-conditioners that cause interference with the powerline signal. Move the adapters 
further away from such appliances to reduce interference. 
Your powerline adapters may be placed close to electrical devices such as electrical 
insect-killers which produce radio waves. These may interfere with the powerline 
signals. Move the adapters further away from such electrical devices.
Your wiring may be old and/or low quality or with a long wiring path.