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# SGSN_Tests.ttcn
* external interfaces
* Gb (emulates PCU side NS/BSSGP + MS)
* Iu (emulates HNBGW side IuPS)
* Gp: GTP (emulates GGSN)
* GSUP (emulates HLR)
* VTY
{% dot sgsn_tests.svg
digraph G {
rankdir=LR;
SGSN [label="IUT\nosmo-sgsn",shape="box"];
ATS [label="ATS\nSGSN_Tests.ttcn"];
STP [label="STP\nosmo-stp"];
ATS -> SGSN [label="Gb"];
SGSN-> ATS [label="Gp (GTP)"];
SGSN -> STP [label="Iu (IuPS)"];
ATS -> STP [label="Iu (IuPS)"];
SGSN -> ATS [label="GSUP"];
ATS -> SGSN [label="VTY"];
}
%}
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