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+# GGSN_Tests.ttcn
+
+* external interfaces
+    * Gp: GTP (emulates SGSN)
+    * Gi: IP (emulates Internet)
+
+{% dot ggsn_tests.svg
+digraph G {
+  rankdir=LR;
+  GGSN [label="GGSN\nosmo-ggsn",shape="box"];
+  ATS [label="ATS\nGGSN_Tests.ttcn"];
+
+  ATS -> GGSN [label="Gp (GTP)"];
+  GGSN -> ATS [label="Gi (IP)"];
+  ATS -> GGSN [label="VTY"];
+}
+%}