The Glossary Page

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• 8B/10B Coding
• 64B/65B Coding
• 64B/66B Coding
• 1000BASE-X
• 10GBASE-R
• 25GBASE-R
• 40GBASE-R
• 100GBASE-R
• 100GBASE-ZR
• 400GBASE-R
• 1+1 Protection Switching (APS)
• 1:n Protection Switching (APS)

A

• AIS (Alarm Indication Signal) – Generic Description
• AI_TSD – Adapted Information (Interface) – Trail Signal Degrade
• AI_TSF – Adapted Information (Interface) – Trail Signal Fail
• AMP (Asynchronous Mapping Procedure) – for non-OTN Client Signals
• Alignment Marker Block (100GBASE-R PCS Encoding)
• APS/PCC field (within the ODU Overhead)  – For Linear Protection Switching
• Atomic Functions (from ITU-T G.798)
• Automatic Protection Protection (APS)

B

• Backward Defect Indicator (dBDI) – OTUk Layer
• Backward Error Indicator (BEI) – OTUk Layer
• Bidirectional Protection Switching (APS)
• Block (for Performance Monitoring and Signal Degrade Declaration Purposes at the ODU Layer)
• Block (for Performance Monitoring and Signal Degrade Declaration Purposes at the OTU Layer)
• Block (for Performance Monitoring and Signal Degrade Declaration Purposes at the TCM Layer i)
• BMP (Bit-Synchronous Mapping Procedure) – for non-OTN Client Signals
• Broadcast Communication (Definition)

C

• CAUI-4
• CAUI-10
• CBR – Constant Bit Rate
• CGMII
• CI_SSD – Characteristic Information (Interface) – Server Signal Degrade
• CI_SSF – Characteristic Information (Interface) – Server Signal Fail
• Connection-Oriented Communication (Definition)
• Connectionless Communication (Definition)
• Consequent Equations – for OTN Applications

D

• dAIS at the ODUk Layer (see ODUk-AIS)
• dAIS at the OTUk Layer (see OTUk-AIS Defect Detection)
• DAPI – Destination Access Point Identifier (for Trail Trace Identifier Messages)
• dBDI at the OTUk Layer (see OTUk-BDI Defect Detection)
• dBIAE (Backward Input Alignment Error Defect) at the OTUk Layer(*)
• dCSF (Client Signal Fail) defect – for Non-Multiplexed ODUk/OPUk traffic(*)
• dDEG at the ODUk Layer(*)
• dDEG at the OTUk Layer(*)
• dDEG for TCM Sections
• DEGM
• DEG_Thr
• Defect Condition
• Defect Correlation
• Destination Address Field (Ethernet Frame)
• Disparity (see Running Disparity)
• dIAE (Input Alignment Error) Defect at the OTUk Layer(*)
• DIX Standard Ethernet Frame
• dLCK – the Locked Defect Condition
• dLCS – Loss of Character Synchronization (100GBASE-R)
• dLOF for OTN (see Loss of Frame Defect – OTN)
• dLOFLOM[p] – Loss of Frame – Loss of Multi-Frame for ODUj Tributary Signal p (*)
• dLOL – Loss of Lane Alignment Defect (applies to OTL3.4 and OTL4.4 Applications)(*)
• dLOM for OTN (see Loss of Multi-Frame – OTN)
• dLOOMFI – Loss of OMFI Defect Condition – for Multiplexed ODU4 Traffic(*)
• dLOR – Loss of Recovery
• dLOS-P – Loss of Signal Defect – Path
• dLTC – Loss of Tandem Connection Monitoring Defect
• DMp – Round Trip Delay Measurement Bit-field – ODUk Path
• dMSIM[p] – Multiplex Structure Identifier Mismatch Defect for ODUj Tributary Signal p (*)
• DMti – Round Trip Delay Measurement Bit-field – TCM Level i Subnetwork
• dOCI – the Open Connection Indication Defect Condition(*)
• dPLM – Payload Type Mismatch – for the 100Gbps Ethernet Adaptation Sink (ODUkP/CBR_ETC100GR-g_A_Sk) Function (*)
• dPLM – Payload Type Mismatch – for Multiplexed ODUk Traffic (e.g., the ODUkP/ODUj-21_A_Sk Function) (*)
• dTIM  at the ODUk Layer(*)
• dTIM at the OTUk Layer(*)

E

• Errored Block
• Ethernet Frame
• Extra Traffic Signal (APS)

F

• Far-End Defect Second – ODUk Layer (see pF_DS)
• Far-End Defect Second – OTUk Layer (see pF_DS)
• Far-End Error Block Count – ODUk Layer
• Far-End Error Block Count – OTUk Layer (see pF_EBC)
• FAS – Framing Alignment Signal
• FEC – Forward Error Correction
• Full-Duplex Communications

G

• GCC – General Communication Channel
• Generic Framing Procedure (GFP)
• Generic Mapping Procedure (GMP)(*)

H

• Half-Duplex Communication
• Head-End (APS)

I

• Internet Packet (IP)
• IPv4
• IPv6

L

• Linear Protection-Switching
• LLM – Logical Lane Marker
• Loss of Frame of Logical Lane (LOFLANE)
• Loss of Frame Defect – OTN (dLOF)
• Loss of Multi-Frame Defect – OTN (dLOM)
• Loss of Recovery – LOR

M

• Manchester Line Code
• Mapping Procedures (for OTN)
• MFAS – Multi-Frame Alignment Signal
• MSI (Multiplex Structure Identifier) for OTN Applications
• Multicast Communication (Definition)

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N

• Near-End Defect Second – OTUk Layer (see pN_DS)
• Near-End Errored Block Count – OTUk Layer (see pN_EBC)
• NJO – Negative Justification Opportunity Byte (AMP)
• Non-Revertive Protection Switching
• Normal Traffic Signal (APS)
• NULL Signal (for OTN Applications)

O

• ODU2 Server Signals (PT = 0x21)
  • ODTU2.1 (Optical Data Tributary Unit – 1 Time-Slot – for ODU0 Tributary Signals)(*)
  • ODTU12 (Optical Data Tributary Unit – 1 Time-Slot for ODU1 Tributary Signals)(*)
  • ODTU2.ts  (Optical Data Tributary Unit – ts Time-Slots – for ODUflex Tributary Signals)(*)
• ODU3 Server Signals (PT = 0x21)
  • ODTU3.1 (Optical Data Tributary Unit – 1 Time-Slot – for ODU0 Tributary Signals)(*)
  • ODTU13 (Optical Data Tributary Unit – 1 Time-Slot for ODU1 Tributary Signals)(*)
  • ODTU23 (Optical Data Tributary Unit – ODU2 Tributary Signals)(*)
  • ODTU3.9 (Optical Data Tributary Unit – 9 Time-Slots – for ODU2e Tributary Signals)(*)
  • ODTU3.ts (Optical Data Tributary Unit – ts Time-Slots – for ODUflex Tributary Signals)(*)
• ODU4 Server Signals (PT = 0x21)
  • ODTU4.1 (Optical Data Tributary Unit –  1 Time-Slot – for ODU0 Tributary Signals)
  • ODTU4.2 (Optical Data Tributary Unit – 2 Time-Slots – for ODU1 Tributary Signals)(*)
  • ODTU4.8 (Optical Data Tributary Unit – 8 Time-Slots – for ODU2/2e Tributary Signals)(*)
  • ODTU4.31 (Optical Tributary Data Unit – 31 Time-Slots – for ODU3 Tributary Signals)(*)
  • ODTU4.ts (Optical Tributary Data Unit – ts Time-Slots – for ODUflex Tributary Signals)(*)
• ODU (Optical Data Unit)
• ODU0 Signal – Data Rate and Characteristics
• ODU1 Signal – Data Rate and Characteristics
• ODU2 Signal – Data Rate and Characteristics
• ODU2e Signal – Data Rate and Characteristics 
• ODU3 Signal – Data Rate and Characteristics 
• ODU4 Signal – Data Rate and Characteristics 
• ODUk_TT_So – ODU Trail Termination Source Atomic Function
• ODUk_TT_Sk – ODU Trail Termination Sink Atomic Function
• ODUk-AIS (Alarm Indication Signal)
• ODUk-LCK (Locked Indication)
• ODUk-OCI (Open Connection Indication)
• ODUT/ODUk_A_Sk – ODUT (TCM) to ODU Adaptation Sink Atomic Function(*)
• ODUT/ODUk_A_So – ODUT (TCM) to ODU Adaptation Source Atomic Function (*)
• ODUTm_TT_Sk – ODUT (TCM) Non-Intrusive Monitoring Function (*)
• ODUT_TT_Sk – ODUT (TCM) Trail Termination Sink Atomic Function(*)
• ODUT_TT_So – ODUT (TCM) Trail Termination Source Atomic Function (*)
• ODUflex Signal – Data Rates and Characteristics
• OMFI (OPU Multi-Frame Indicator)
• OPU (Optical Payload Unit)
• OSI Reference Model
• OTL3.4 Interface
• OTL4.4 Interface
• OTL4.10 Interface
• OTSi – Optical Tributary Signal
• OTSi/OTUk_A_Sk – OTSi to OTUk Adaptation Sink (Atomic) Function
• OTSi/OTUk_A_So – OTSi to OTUk Adaptation Source (Atomic) Function
• OTSiG – Optical Tributary Signal Group
• OTSiG/OTUk_A_Sk – OTSiG to OTUk Adaptation Source (Atomic) Function (OTU3/4 Applications ONLY)
• OTSiG/OTUk_A_So – OTSiG to OTUk Adaptation Source (Atomic) Function (OTU3/4 Applications ONLY)
• OTU (Optical Transport Unit) Frame
• OTUk/ODUk_A_Sk – OTUk to ODUk Adaptation Sink (Atomic) Function
• OTUk/ODUk_A_So – OTUk to ODUk Adaptation Source (Atomic) Function
• OTUk-AIS (dAIS) Defect Condition
• OTUk-AIS (Alarm Indication Signal) Maintenance Signal
• OTUk-BEI (Backward Error Indicator)
• OTUk-BIP-8 (Bit Interleaved Parity) 
• OTUkV (Functionally Compliant OTUk Frames)
• OTUk_TT_Sk – OTUk Trail Termination Sink (Atomic) Function
• OTUk_TT_So – OTUk Trail Termination Source (Atomic) Function

P

• Path Monitoring BEI (PM-BEI)
• Path Monitoring BIP-8 (PM-BIP-8)
• Path Monitoring – Round-Trip Delay Measurements – using DMp
• Path Monitoring – Round-Trip Delay Measurements – using DMt1 through DMt6
• Path Terminating Equipment (PTE)
• Payload Type (PT)
• PCC – Protection Communication Channel (APS)
• PCS – Physical Coding Sublayer (Ethernet)
• Physical Layer
• pF_DS (Far-End Defect Seconds) – ODUk Layer
• pF_DS (Far-End Defect Seconds) – OTUk Layer
• pF_EBC (Far-End Errored Block Count) – OTUk Layer
• PJO – Positive Justification Opportunity Byte
• pN_DS (Near-End Defect Seconds) – OTUk Layer
• pN_EBC (Near-End Errored Block Count) – OTUk Layer
• Preamble (Ethernet Frame)
• Protection Group (APS)
• PSI (Payload Structure Identifier – OPUk)
• PT = 20 Method for Mapping/Multiplexing ODUj Signals into an ODUk Signal
• PT = 21 Method for Mapping/Multiplexing ODUj Signals into an ODUk Signal

R

• RDI (Remote Defect Indicator)
• Reliable Communication (Definition)
• Revertive Protection Switching
• Ring-Switching (within a Shared-Ring Protection-Switching System)
• Running Disparity

S

• SAPI – Source Access Point Identifier (for Trail Trace Identifier Messages)
• Scrambling
• Section Monitoring BEI (SM-BEI) – See OTUk-BEI
• Section Monitoring BIP-8 (SM-BIP-8) – See OTUk-BIP-8
• Section Monitoring Overhead (SMOH)
• Section Terminating Equipment (STE)
• Shared-Ring Protection (SRP) Switching Systems
• Simplex Communication
• Sink-Node (APS) – See Tail-End (APS)
• SNC/I – Subnetwork Connection Protection – Inherent Monitoring (Protection-Switching)(*)
• SNC/Ne – Subnetwork Connection Protection – Non-Intrusive (End-to-End) Monitoring (Protection-Switching)(*)
• SNC/Ns – Subnetwork Connection Protection – Non-Intrusive (Sublayer) Monitoring (Protection-Switching)(*)
• SNC/S – Subnetwork Connection Protection – Sublayer Monitoring (Protection-Switching)(*)
• Source Address Field (Ethernet Frame)
• Source-Node (APS) – See Head-End (APS)
• Span (within a Shared-Ring Protection-Switching System)
• Span-Switching (within a Shared-Ring Protection-Switching System)

T

• Tail-End (APS)
• TCM – Tandem Connection Monitoring
• TCM Controller – Tandem Connection Monitoring Controller Atomic Function
• TCMi-dAIS – Tandem Connection Monitoring Level i – dAIS
• TCMi-dBDI – Tandem Connection Monitoring Level i – dBDI
• TCMi-BEI – Tandem Connection Monitoring Level i – BEI
• TCMi-dBIAE – Tandem Connection Monitoring Level i – dBIAE
• TCMi-BIP-8 – Tandem Connection Monitoring Level i – BIP-8
• TCMi-dDEG – Tandem Connection Monitoring Level i – dDEG
• TCMi-dIAE – Tandem Connection Monitoring Level i – dIAE
• TCMi-dLCK – Tandem Connection Monitoring Level i – dLCK
• TCMi-dLTC – Tandem Connection Monitoring Level i – Loss of Tandem Connection Monitoring Defect
• TCMi-dOCI – Tandem Connection Monitoring Level i – dOCI
• TCMi-dTIM – Tandem Connection Monitoring Level i – dTIM
• Trail Protection
• Trail Trace Identifier (TTI) Messages

U

• Unicast Communication (Definition)
• Unidirectional Protection Switching (APS)
• Unreliable Communication (Definition)

W

• Wait-to-Restore period (or Timer)

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