+----------------------+
|     Application      |
+----------------------+
           |
           | (1) Application Data Units (ADUs)
           |
           v
+----------------------+                           +----------------+
|    FEC Framework     |                           |                |
|                      |-------------------------->|   FEC Scheme   |
|(2) Construct source  |(3) Source Block           |                |
|    blocks            |                           |(4) FEC Encoding|
|(6) Construct FEC     |<--------------------------|                |
|    Source and Repair |                           |                |
|    Packets           |(5) Explicit Source FEC    |                |
+----------------------+    Payload IDs            +----------------+
           |                Repair FEC Payload IDs
           |                Repair symbols
           |
           |(7) FEC Source and Repair Packets
           v
+----------------------+
|  Transport Protocol  |
+----------------------+