ZyXEL Communications 401 User Manual

Chapter 5 LEDs and Troubleshooting

PLA-4xx Series User’s Guide

2 Inspect your cables for damage. Contact the vendor to replace any damaged cables.
3 Check the Ethernet adapter on your computer and make sure it’s enabled and working 

properly. 

4 If the PLA-4xx is connected to an Ethernet switch or router, make sure the device is 

working correctly, and that the LAN network is working and configured correctly as 
well. 

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1 Use the PLA-4xx Series Configuration Utility to detect all other HomePlug devices on 

your powerline network. Make sure that the network password is the same on all of your 
powerline adapters. 

2 Check the DAK and MAC address for all powerline adapters are typed correctly.
3 Make sure that all your powerline adapters are HomePlug AV compliant. Check the 

package it came in or ask your vendor. This PLA-4xx can not detect earlier versions of 
HomePlug powerline adapters such as HomePlug 1.0 or 1.0.1. (Although they can 
coexist on the same electrical wiring without interfering with each other.)

4 Make sure that the powerline adapters on your network are all on the same electrical 

wiring. Connect another powerline adapter into an outlet close to your PLA-4xx’s power 
outlet. They are probably now on the same electrical wiring. Check the Link 

 LED. If 

it now lights up your powerline adapter was probably previously on separate electrical 
wiring. Ask an electrician for more information on the electrical wiring in your building.

5 If your powerline network is using coaxial cable, check all powerline adapters are on the 

same coaxial cable. 

6 If your powerline network is using electrical wiring (not coaxial cable), check you do not 

have a power meter between powerline adapters. Powerline signals cannot pass this.

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• Make sure your computer is using Windows XP or Windows Vista (32-bit) operating 

system. At the time of writing, this is the only compatible operating system for the 
configuration utility.

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• Inspect the LEDs on your PLA-4xx and make sure that the ETHN and LINK LEDs are on 

or blinking. See 

 for troubleshooting LED related problems.