centralserver=QueueingNetworkProcess[(({{0}, {0}, {0}})),(({{0, 0.3, 0.7}, {1, 0, 0}, {1, 0, 0}})),(({{μ}, {0.5}, {1.25}})),(({{1}, {1}, {1}})),10];

data=RandomFunction[centralserver/.{μ->1},{0,50}];
ListLinePlot[data,PlotLegends->Range[3],InterpolationOrder->0,Filling->Axis,PlotRange->{0,10}]

data=RandomFunction[centralserver/.{μ->2},{0,50}];
ListLinePlot[data,PlotLegends->Range[3],InterpolationOrder->0,Filling->Axis,PlotRange->{0,10}]