Do it again, what's happened?

## Abbreviations

- 0xYY: Y is a value in hexadecimal presentation
- 3R: Re-amplification, Reshaping and Retiming
- ACT: Activation (in the TCM ACT byte)
- AI: Adapted Information
- AIS: Alarm Indication Signal
- APS: Automatic Protection Switching
- BDI: Backward Defect Indication
- BEI: Backward Error Indication
- BIAE: Backward Incoming Alignment Error
- BIP: Bit Interleaved Parity
- CBR: Constant Bit Rate
- CI: Characteristic Information
- CM: Connection Monitoring
- CRC: Cyclic Redundancy Check
- DAPI: Destination Access Point Identifier
- EXP: Experimental
- ExTI: Expected Trace Identifier
- FAS: Frame Alignment Signal
- FDI: Forward Defect Indication
- FEC: Forward Error Correction
- GCC: General Communication Channel
- IaDI: Intra-Domain Interface
- IAE: Incoming Alignment Error
- IrDI: Inter-Domain Interface
- JOH: Justification Overhead
- LSB: Least Significant Bit
- MFAS: Multi-Frame Alignment Signal
- MFI: Multi-frame Indicator
- MS: Maintenance Signal
- MSB: Most Significant Bit
- MSI: Multiplex Structure Identifier
- NNI: Network Node Interface
- OCh: Optical channel with full functionality
- OCI: Open Connection Indication
- ODU: Optical Channel Data Unit
- ODUk: Optical Channel Data Unit-k
- ODTUjk: Optical channel Data Tributary Unit j into k
- ODTUG: Optical channel Data Tributary Unit Group
- ODU-Xv: X virtually concatenated ODUk's
- OH: Overhead
- OMS: Optical Multiplex Section
- OM-OH: Optical Multiplex Section Overhead
- OMU: Optical Multiplex Unit
- ONNI: Optical Network Node Interface
- OOS: OTM Overhead Signal
- OPS: Optical Physical Section
- OPU: Optical Channel Payload Unit
- OPUk: Optical Channel Payload Unit-k
- OPUk-Xv: X virtually concatenated OPUk's
- OSC: Optical Supervisory Channel
- OTH: Optical Transport Hierarchy
- OTM: Optical Transport Module
- OTN: Optical Transport Network
- OTS: Optical Transmission Section
- OTS-OH: Optical Transmission Section Overhead
- OUT: Optical Channel Transport Unit
- OTUk: Optical Channel Transport Unit-k
- PCC: Protection Communication Channel
- PM: Path Monitoring
- PMI: Payload Missing Indication
- PMOH: Path Monitoring OverHead
- Ppm: parts per million
- PRBS: Pseudo Random Binary Sequence
- PSI: Payload Structure Identifier
- PT: Payload Type
- RES: Reserved for future international standardization
- RS: Reed-Solomon
- SAPI: Source Access Point Identifier
- Sk: Sink
- SM: Section Monitoring
- SMOH: Section Monitoring OverHead
- So: Source
- TC: Tandem Connection
- TCM: Tandem Connection Monitoring
- TS: Tributary Slot
- TxTI: Transmitted Trace Identifier
- UNI: User-to-Network Interface
- VCG: Virtual Concatenation Group
- VCOH: Virtual Concatenation Overhead
- vcPT: virtual concatenated Payload Type

## The key words

The following layers are defined in OTN:

- OPUk: Optical payload unit k (k = 0, 1, 2, 3, 4)
- ODUk: Optical data unit k (k = 0, 1, 2, 3, 4)
- OTUk: Optical transport unit k (k = 1, 2, 3, 4)
- OCh: Optical channel, a single wavelength
- OMSn: Optical multiplex section of order n (Capacities for n = 0 and n = 16 are defined)
- OTSn: Optical transmission section of order n (Capacities for n = 0 and n = 16 are defined)
- OTM-n.m: Optical transport module of rate m with n optical channels. Possible values for m are:
  - 1: 2.5 Gb/s
  - 2: 10 Gb/s
  - 3: 40 Gb/s
  - 4: 100 Gb/s
- OMU: Optical Multiples Unit
- OSC: Optical Supervisory Channel
- OLA: Optical in-Line Amplifier
- OPA: Optical Pre-Amplifier
- OBA: Optical Booster Amplifier

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