The current hypothesis is that there may be certain fibre batches from OFS that cannot progress through our fusion processes without some minor effect on the fibre buffer. The feature is visible under certain lighting conditions, however all devices pass G&H high reliability standard of visual inspection. G&H observe a high level of training, assessment programs, equipment maintenance protocols and process controls. SMB980 fibre being the only commonality, we maintain that there are no non-conformances occurring within our processes that are the cause of this feature. We also maintain there are no reliability risks associated with this feature.