OMS 3250

Product DescriptionOMS3250A-CC-AAB-AA-BA-BB-ABc: 2-fibre SPRing (Node Failure)DC-AA-CCWorkingProtectionFigure 14: Two fibre MS-SPRing (Node Failure)The relevant Switch Matrix Unit implements the loopback. The protection mechanism can beactivated by the following criteria:• Signal Fail at section level (LOS, LOF, MS-AIS, excessive BER);• Signal Degrade (BER exceeds a preset threshold in the range of 10-5 to 10-9);• Command from the Local Terminal or Element Manager.All these procedures are managed by an appropriate APS (Automatic Protection Switching)protocol provided by K1, K2 bytes. As an option low priority traffic can be managed.9.3 Ring Interworking ProtectionInterworking SDH protection architectures provides an even greater degree of protection withina network. Ring interworking is accommodated in such a way that if two rings are connected atmore than one node each, a failure at one of these nodes shall not cause loss of any service.OMS3250 supports interworking between SNCP protected rings, MS-SPRing protected ringsand mixtures of the two, according to ITU-T G.842.Overlapping SNCP should be used as an alternative and simpler method.9.4 OTN protectionOMS3250 supports the following types of protection architectures for an OTN network:• Inherent Subnetwork Connection Protection (SNC/I) on ODUk (that is equivalent, forswitching criteria point of view, to an OTUk Trail protection);• Non-intrusive Subnetwork Connection Protection (SNC/N) on ODUk;Each protection application makes use of pre-assigned capacity between nodes.Page 42 of 74 Copyright – Refer to Page 2 Issue 1