NETGEAR XAVB5602 Installation Manual page 8

After a few seconds, the security is set and the Power LED turns
solid green. The Powerline adapters can communicate over the
Powerline network in a secure way.
Warning: Do not press the Security button until the Power LED
on each adapter is solid green. Pressing this button too soon can
temporarily disable Powerline communication. If Powerline
communication is disabled, use the Factory Reset button to
return the Powerline adapter to its factory settings.
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