DetNet                                        DetNet
DetNet  Service        Transit          Transit       Service  DetNet
MPLS    |             |<-Tnl->|        |<-Tnl->|            |  MPLS
End     |             V   1   V        V   2   V            |  End
System  |    +--------+       +--------+       +--------+   |  System
+---+   |    |   R1   |=======|   R2   |=======|   R3   |   |  +---+
|  X...DFa...|._X_....|..DF1..|.__ ___.|..DF3..|...._X_.|.DFa..|.X |
|CE1|========|    \   |       |   X    |       |   /    |======|CE2|
|   |   |    |     \_.|..DF2..|._/ \__.|..DF4..|._/     |   |  |   |
+---+        |        |=======|        |=======|        |      +---+
    ^        +--------+       +--------+       +--------+      ^
    |        Relay Node       Relay Node       Relay Node      |
    |          (S-PE)           (S-PE)           (S-PE)        |
    |                                                          |
    |<---------------------- DetNet MPLS --------------------->|
    |                                                          |
    |<--------------- End-to-End DetNet Service -------------->|

    -------------------------- Data Flow ------------------------->