OMS 3250

OMS3250Product DescriptionThe MS-SPRing protocol manages the NUT (Non Pre-emptable Unprotected Traffic) as definedin the latest G.841 version.The equipment can be configured for particular network applications to support multiple ringseach protected by MS-SPRing.MS-SPRing is characterised by dividing the total payload (in every STM-N link) equally intoworking and protection capacity. The working traffic is bi-directional over a single path (e.g. A-Band B-A in Figure 12). The protection capacity is shared by all the working sections and notdedicated to each connection on the ring.AB-AA-BA-BB-ABA-CC-Aa: 2-fibre SPRing (Normal Condition)DCC-AA-CFigure 12: Two fibre MS-SPRing (Normal Condition)In case of link or node failure a loopback is performed at the nodes adjacent to the failed link ornode (see Figure 13 and Figure 14).AB-AA-BA-BB-ABA-CC-Ab: 2-fibre SPRing (UnidirectionalLink Failure)DCC-AA-CFigure 13: Two fibre MS-SPRing (Unidirectional Link Failure)Issue 1 Copyright – Refer to Page 2 Page 41 of 74