The Interface Live Viewer is a great tool - allowing you to closely monitor an interface that you're analyzing.  I just had an instance where I wanted to look at in/out errors.  While I can see the errors regularly collecting, I'm puzzled by the Y-axis label of 'bps'.  Interface errors, broadcasts, and multicasts are counted in terms of packets.  If a packet is in error, there's no way to tell how many bits were in the packet, from which you could deduce a bps value.  So I presume that the value is really 'pps' and that a common axis label is used for Throughput as well as the other variables.