the square pattern is the vmng300 modem, overall its better than the superhub but it displays somewhat odd behaviour with that. The small large spikes are probably utilisation spikes on the UBR.
If your graph is from a superhub its looking very good.
here is a graph from the last day I used the superhub which was earlier this week. It says vmng300 but is the superhub, you will notice the blue bit is much thicker than yours.
