PLC Device---PLC Device
                 / \        / \                   +---------
                /   \      /   \                 /
               /     \    /     \               +
              /       \  /       \              |
       PLC Device--PLC Device---PANC ===========+  Internet
              \       /  \       /              |
               \     /    \     /               +
                \   /      \   /                 \
                 \ /        \ /                   +---------
             PLC Device---PLC Device

     <------------------------------->
         PLC subnet (IPv6 over PLC)