Serial Interface Unit (SIU) phase errors are logged when the SIU is
unable to properly receive an incoming cell. In particular, the SIU timed out
while looking for the frame alignment pattern (FAP) in the serial data and gave
up until the next frame cycle.
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This document is not restricted to specific software and hardware
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An SIU always sends and receives, and sends Null BFrames when it has no
other data available. When an SIU phase error occurs, either a Null BFrame or a
Data Frame might have dropped, so traffic might be disrupted.
They are errors on the point-to-point data path, so they fit into the
general category of debug.