-----------
                                |   -----   |
            Service             |  | TED |<-+----------->
            Request             |   -----   |  TED synchronization
               |                |     |     |  mechanism (e.g., the
               v                |     |     |  routing protocol)
         ------------- Request/ |     v     |
        |             | Response|   -----   |
        |     NMS     |<--------+> | PCE |  |
        |             |         |   -----   |
         -------------           -----------
       Service |
       Request |
               v
          ----------  Signaling   ----------
         | Headend  | Protocol   | Adjacent |
         |  Node    |<---------->|   Node   |
          ----------              ----------