CE1         CE2         CE3
        xo*         * *         *ox
    ____xo*_________*_*_________*ox____
  _/    xo*         * *         *ox    \_
 /      xo*********** ***********ox      \
(       xo                       ox       )
(       xooooooooo(ACE1)oooooooooox       )
(       x                         x       )
(       x   ------------------    x       )
(       x  | Service Function |   x       )
(       x  |  ....(ACE2)....  |   x       )
(       x  | :              : |   x       )
(       xxxx.:....(ACE3)....:.xxxxx       )
(          | :              : |           )
(          |  ....(ACE4)....  |           )
(          |                  |           )
(           ------------------            )
(                                         )
 \_          Operator Network           _/
   \___________________________________/