OMS 3250

OMS3250Product Description5.1.2 Multiplex Section Overhead (MSOH)B2MULTIPLEX SECTION ERROR MONITORING; it is used for multiplexsection error monitoring (BIP-Nx24 parity check code).K1, K2 (b1÷b5) AUTOMATIC PROTECTION SWITCHING CHANNEL; it is used for MSPand MS-SPRing protocol management.K2 (b6÷b8)D4÷D12(DCC M )E2S1 (b5÷b8)M1OthersMS-REMOTE DEFECT INDICATION MS-AIS; it is used for alarmindication and MS-SPRing protocol managementDATA COMMUNICATION CHANNEL; they provides a 576 Kb/s datacommunication channelENGINEERING ORDER-WIRE; it may provide a 64 Kb/s order-wirechannel for voice communicationSYNCHRONISATION STATUS; they transport the SSM (SynchronisationStatus Message)MS-REMOTE ERROR INDICATION; it transports the number of errorsdetected using B2 bytesRESERVED FOR NATIONAL USE;UNMARKED5.2 POH Bytes Description5.2.1 VC-4 / VC-4Xc / VC-4-Xv POHJ1B3C2G1F2-F3H4K3 (b1÷b4)K3 (b5÷b8)PATH TRACE; it is used to transmit repetitively a High Order Path AccessPoint IdentifierPATH ERROR MONITORING; it is used for path error monitoring (BIP-8parity check code).SIGNAL LABEL; it indicates the composition of the VC3/4 payloadPATH STATUS; it conveys back to a path originator the path terminatingstatus and performancePATH USER CHANNEL; they are allocated for user communicationpurposePOSITION AND SEQUENCE INDICATOR; it provides a multi-frame andsequence indicator for virtual VC-4 concatenationAUTOMATIC PROTECTION SWITCHING (APS) CHANNEL; they areprovisionally allocated for APS signalling for network protection of HighOrder Path LevelSPARE; they are allocated for future purposeIssue 1 Copyright – Refer to Page 2 Page 31 of 74