-{}- : bidirectional link
-''- : WiFi link
C : where Network Coding techniques could be introduced 

+----+    +--------+    +---+    +-------+    +-------+    +--------+
|End |    |Sat.    |    |SAT|    |Phy    |    |Access |    |Network |
|user|-''-|Terminal|-{}-|   |-{}-|Gateway|-{}-|Gateway|-{}-|Function| 
+----+    +--------+    +---+    +-------+    +-------+    +--------+
   C          C                                  C            C