T1 reported rates are incorrect on WAN interfaces.

T1 reported rates are incorrect on WAN interfaces.

I am getting spikes way above 100% utilziation rates.  The interface in NetFlow Manager is set to 1536000 bits per second (full T1 speed).  The serial interface on the routers are set for frame relay.  Bandwidth and the clockrate are set at the frame switch.  Is what I am seeing in the reports reliable and correct?  It seems not based on the fact that I would think that you can't have utilization rates above 100%.  Any help in this matter is greatly appreciteated.
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