osmo-gsm-manuals/common/chapters/sigtran-simple-3g.dot

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digraph G {
rankdir=LR;
UE0 [label="UE"];
UE1 [label="UE"];
UE2 [label="UE"];
UE3 [label="UE"];
HNB0 [label="hNodeB"];
HNB1 [label="hNodeB"];
HNBGW [label="OsmoHNBGW"];
MSC [label="OsmoMSC"];
SGSN [label="OsmoSGSN"];
STP [label="OsmoSTP"];
UE0 -> HNB0;
UE1 -> HNB0;
UE2 -> HNB1;
UE3 -> HNB1;
HNB0 -> HNBGW [label="Iuh (RUA)"];
HNB1 -> HNBGW [label="Iuh (RUA)"];
HNBGW -> STP [label="Iu (SCCP/M3UA)"];
STP -> MSC [label="Iu (SCCP/M3UA)", dir="back"];
STP -> SGSN [label="Iu (SCCP/M3UA)", dir="back"];
}