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1、Optical Transport Network interpretation of STM-LOF alarm + STM-AIS due to OTN fail Enhanced OAM e.g. preventing alarm storms Optical Channel (OCh) layerSTM-N, IP, ATM and Ethernet signals mapped (“wrapped“) into OCh frame (OCh Data Unit (ODUk) First transmission technology in which each stakeholder
2、 gets its own (ODUk) connection monitoring In addition ODUk supports/provides: STM-N independent monitoring, becoming a service signal “itself“, shortest physical layer stack for data services, TDM muxing, STM-N inverse multiplexing, client independent protection switching, plesiochronous timing (no
3、 sync network required)9April 2002 O/E/O ObjectivesnMinimise O/E/O processing in OTN O/E/O processing at edges of administrative/vendor (sub)domains Span engineering O/E/O processing at edges of protected or switched domain Span engineering (short/long route effects) Signal Fail implementations are
4、very much technology dependentOTUkODUkClients (e.g. STM-N, ATM, IP, Ethernet)OPUkODUkPODUkTOPSnOTM-0.m OTM-nr.mReduced functionalityOChrOChsubstructureOTUkused between (and within) OTN transparent subnetworksStandardised i.e. 3R points at each end, no repeaters24April 2002 OTM-0.m Signal (m=1,2,3) S
5、ingle channel signal (“colourless“: 1310 or 1550 nm) Optical parameters according to ITU-T Recommendation G.959.1 Bit rate and format of the associated overhead according to ITU-T Recommendation G.709 No Optical Supervisory Channel (OSC) non-associated overhead not required; i.e. 3R points at each e
6、nd, no repeaters25April 2002 OTM-n.m Signal (m=1,2,3,12,23,123) Up to “n“ wavelengths carrying traffic, with a grid dependent on bit rate 1 “out-of-band“ Optical Supervisory Channel (OSC) transporting the OTM Overhead Signal (OOS) OTM Overhead Signal transports OTS, OMS, OCh (non-associated) overhea
7、d and General management communications326April 2002 OTM Signals versus OTN Interfaces27April 2002 OTM Overhead Signal (OOS) Non-associated overheadBDI: Backward Defect Indication FDI-O: Forward Defect Indication - Overhead FDI-P: Forward Defect Indication - PayloadOCI: Open Connection Indication PM
8、I: Payload Missing Indication TTI: Trail Trace IdentifiernOOS functions subject to standardizationnOOS bit rate & format not standardizedNon-Associated overheadOTSnn3 2OCh1General Management CommunicationsVendorSpecificOMSnFDI-OFDI-POCIOCh OH extensions may be expected in future to support e.g. OCh
9、protection (e.g. OCh SPring)BDI-OBDI-PPMIFDI-PFDI-OBDI-OBDI-PPMITTI28April 2002 OTUk and ODUk frame formats (k=1,2,3)3825408017 814 1516 1738241234OPU k PayloadOPUk OHOPUk - Optical Channel Payload UnitODUkODUk - Optical Channel Data UnitClient Signal mapped in OPUk PayloadClient SignalOTUk FECOTUkO
10、HOTUk - Optical Channel Transport UnitAlignmAlignmentk indicates the order: 1 2.5G 2 10G 3 40GOTUk bit rate: 255/(239-k) * “STM-N“ODUk bit rate: 239/(239-k) * “STM-N“29April 2002 OTUk and ODUk Overhead (k=1,2,3) Associated overheadAlignmOPU k PayloadOPUk OHODUkOTUkOHPSIEXPTCM ACTTCM5TCM4TCM3TCM2TCM1
11、TCM6GCC1GCC2FTFLPMRESRESAPS/PCCSMRESGCC0FASMFAS Mapping & Concat SpecificMapping & Concat Specific2550 1PTTTIBIP-812345678123PM12345678BEIBDISTAT12345678TCMiSTATTTIBIP-812345678123 12345678BEI/BIAEBDI12345678MFAS: MultiFrame Alignment Signal PCC: Protection Communication Control channel PM: Path Mon
12、itoring PSI: Payload Structure Identifier RES: Reserved for future international standardisation SM: Section Monitoring TCM: Tandem Connection MonitoringACT: Activation/deactivation control channel APS: Automatic Protection Swiching coordination channel EXP: Experimental FAS: Frame Alignment Signal
13、FTFL: Fault Type & Fault Location reporting channel GCC: General Communication Channel30April 2002 OTUkV (k=1,2,3)nFrame format is vendor specificnForward Error Correction code is vendor specificnMinimum overhead set to support is: Trail Trace Identifier Error Detection Code (e.g. BIP) Backward Defe
14、ct Indicator Backward Error Indicator (Backward) Incoming Alignment ErrornOther overhead is vendor specificnODUk mapping into OTUkV is vendor specific31April 2002 Overhead versus OTN InterfacesnOTM Interface Ports on IP Router, ATM Switch, Ethernet Switch and SDH equipment should support the followi
15、ng minimum set of overhead OPUk Client Specific OPUk Payload Structure Identifier (PSI) ODUk Path Monitoring (PM) OTUk Section Monitoring (SM) Frame Alignment (FAS, MFAS)32April 2002 Overhead versus OTN Interfaces nOverhead passed through network OTM UNI to OTM UNI OTM NNI IrDI to OTM NNI IrDI33Apri
16、l 2002 Overhead versus OTN InterfacesnOverhead passed through network from OTM UNI to OTM UNI interface OPUk PSI, Client Specific ODUk PM, TCM ACT, TCM1TCMn, TCM ACT, RES ODUk GCC1, GCC2 according contract ODUk APS/PCC definition is under study34April 2002 Overhead versus OTN InterfacesnOverhead passed through network from OTM NNI IrDI to OTM NNI IrDI interface OPUk PSI, Client Specific ODUk PM, TCM ACT, TCM1TCMm, TCM ACT,
