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.
There are no specific requirements for this document.
This document is not restricted to specific software and hardware versions.
Refer to the Cisco Technical Tips Conventions for more information on document conventions.
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.
The Cisco Support Community is a forum for you to ask and answer questions, share suggestions, and collaborate with your peers.
Refer to Cisco Technical Tips Conventions for information on conventions used in this document.