+---------------------------------+
      |                                 |
      |        DetNet OAM Packet        |
      |                                 |
      +---------------------------------+ <--\
      | DetNet Associated Channel Header|    |
      +---------------------------------+    +--> DetNet active OAM
      |           S-Label               |    |    MPLS encapsulation
      +---------------------------------+    |
      |         [ F-Label(s) ]          |    |
      +---------------------------------+ <--/
      |           Data-Link             |
      +---------------------------------+
      |           Physical              |
      +---------------------------------+