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+# BSC_Tests.ttcn
+
+* external interfaces
+ * A-bis side: RSL (emulates BTS-side client)
+ * A-side: BSSAP/SCCP/M3UA (emulates MSC-side)
+ * MGW side: MGCP (emulates MGW side)
+
+{% dot bsc_tests.svg
+digraph G {
+ rankdir=LR;
+ { rank=same; BTS; STP; };
+ BSC [label="IUT\nosmo-bsc",shape="box"];
+ ATS [label="ATS\nBSC_Tests.ttcn"];
+ BTS [label="osmo-bts-omldummy\nOML only"];
+
+ BTS -> BSC [label="A-bis OML"];
+ ATS -> BSC [label="A-bis RSL"];
+ ATS -> BSC [label="CTRL"];
+ ATS -> BSC [label="VTY"];
+ ATS -> STP [label="A BSSAP\nSCCP/M3UA"];
+ BSC -> STP [label="A BSSAP\nSCCP/M3UA"];
+}
+%}