SNCP to MS-SPRing Upgrade (ONS 15454 SDH only) Use the SNCP to MS-SPRing Topology Conversion wizard to convert an SNCP to a two-fiber MS-SPRing. The wizard has four pages: MS-SPRing Attributes Create MS-SPRing SNCP to MS-SPRing Force Traffic SNCP to MS-SPRing Conversion Note Open-ended SNCP and SNCP DRI configurations do not support in-service topology upgrades.