UPSR to BLSR Upgrade (ONS 15600 does not support this feature). Use the UPSR to BLSR Topology Conversion wizard to convert the path protection to a two-fiber BLSR. The wizard has four pages: BLSR Attributes Create BLSR UPSR to BLSR Force Traffic UPSR to BLSR Conversion Note Open-ended UPSR and UPSR dual ring interconnect (DRI) configurations do not support in-service topology upgrades.