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+# HNB_Tests.ttcn
+
+* external interfaces
+    * Iuh side (emulates HNBGW-side)
+        * SCTP/HNBAP
+        * SCTP/RUA/RANAP
+    * RTP side: emulates MGW
+    * GTP-U side: emulates GGSN
+    * UE side
+    * VTY
+    * CTRL
+    * StatsD
+
+{% dot hnb_tests.svg
+digraph G {
+  graph [label="HNB_Tests", labelloc=t, fontsize=30];
+  rankdir=LR;
+  { rank=same; ATS; HNB; };
+  HNB [label="IUT\nosmo-bsc",shape="box"];
+  ATS [label="ATS\nHNB_Tests.ttcn"];
+
+  HNB <- ATS [label="Uu (or some intermediate lower layer)"];
+  HNB -> ATS [label="Iuh"];
+  HNB -> ATS [label="RTP"];
+  HNB -> ATS [label="GTP-U"];
+  HNB <- ATS [label="CTRL"];
+  HNB <- ATS [label="VTY"];
+  HNB -> ATS [label="StatsD"];
+}
+%}