OTN frame structure

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Hi Anees !

OTN system is structured in layered networks consisting of several sublayers [404]. It is a recent modernized standard aimed to replace SONET/SDH. Each sublayer is responsible for specific services and is activated at its termination points. The Optical Data Unit (ODU) sublayer currently defines five bit-rate client signals, i.e., 1.25, 2.5, 10, 40, and 100 Gbps that are referred to as ODUk.

OTN also defines the ODUk time division multiplexing sublayer. It supports the multiplexing and transporting of several lower bit-rate signals into a higher bit-rate signal and maintains an end-to-end trail for the lower bit-rate signals. The multiplexing of ODUk signals is easy to visualize from the bit-rates shown in Table 24.2. There are two additional specifications: ODU2e and ODUflex. For the purpose of capacity planning modeling, ODU2e can be treated as ODU2, and is not necessary to consider separately. ODUflex is any rate over ODU1, which from a modeling purpose, can be treated as a real variable with lower bound 1 Gbps.

I hope this might help . See the below link for details :
https://www.sciencedirect.com/topics/computer-science/optical-transport-network

Hello, friend!

The following figure shows the OTN frame structure.

ACT:    Activation/deactivation control channel

APS:    Automatic Protection Swiching coordination channel

EXP:    Experimental

FAS:    Frame Alignment Signal

FTFL:   Fault Type & Fault Location reporting channel

GCC:   General Communication Channel

MFAS: MultiFrame Alignment Signal

PCC:  Protection Communication Control channel

PM:     Path Monitoring

PSI:    Payload Structure Identifier

RES:  Reserved for future international standardisation

SM:    Section Monitoring

TCM: Tandem Connection Monitoring

For details about OTN overheads, click: OTN Overheads

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