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

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

	subgraph cluster_0 {
		label = "sysmoBTS"
		OsmoBTS
		OsmoPCU [style="dashed"]
		PHY -- OsmoBTS [label="shmem msgq"]
		PHY -- OsmoPCU [label="shmem msgq"]
		OsmoPCU -- OsmoBTS [label="pcu_sock"]
		{ rank=same; OsmoBTS OsmoPCU }
	}

	subgraph cluster_1 {
		label = "Linux PC"
		OsmoBSC
		OsmoMSC
		OsmoHLR
		OsmoSGSN [style="dashed"]
		OsmoGGSN [style="dashed"]
		OsmoBTS -- OsmoBSC [label="Abis/IP"]
		OsmoBSC -- OsmoMSC [label="A/IP"]
		OsmoMSC -- OsmoHLR [label="GSUP/IP"]
		OsmoPCU -- OsmoSGSN [label="Gb/IP"]
		OsmoSGSN -- OsmoGGSN [label="Gn/IP"]

		{ rank=same; OsmoMSC OsmoSGSN }
	}
}