graph G {
	rankdir=LR;
	MS0 [label="MS",shape=box]
	MS1 [label="MS",shape=box]
	MS2 [label="MS",shape=box]

	USRP [label="USRP Bxxx",shape=box]
	USRP -- OsmoTRX [label="USB"]

	MS0--USRP [label="Um"]
	MS1--USRP [label="Um"]
	MS2--USRP [label="Um"]

	subgraph cluster_0 {
		label = "Linux PC (all-in-one)"
		OsmoTRX
		OsmoBTS
		OsmoPCU [style="dashed"]
		OsmoPCU -- OsmoBTS [label="pcu_sock"]
		OsmoTRX -- OsmoBTS [label="UDP"]
		{ rank=same; OsmoBTS OsmoPCU }

		OsmoBSC
		OsmoMSC
		OsmoHLR
		OsmoSGSN [style="dashed"]
		OsmoGGSN [style="dashed"]
		OsmoBTS -- OsmoBSC [label="Abis/IP\n(lo)"]
		OsmoBSC -- OsmoMSC [label="A/IP\n(lo)"]
		OsmoMSC -- OsmoHLR [label="GSUP/IP\n(lo)"]
		OsmoPCU -- OsmoSGSN [label="Gb/IP\n(lo)"]
		OsmoSGSN -- OsmoGGSN [label="Gn/IP\n(lo)"]

		{ rank=same; OsmoMSC OsmoSGSN }
	}
}