# OTN (Optical Transport Network)

## Tech Terms

![](/files/-LoJq5TJDydeTN3TWDTf)

I strongly recommend you read this PDF first: <https://www.viavisolutions.com/en-us/literature/g709-optical-transport-network-otn-white-paper-en.pdf>

## What is OTN

Optical Transport Network

ITU-T G.709 is a standard for OTNs

> G. *标准出自 ITU-T 802.* 标准出自 IEEE

* 引入`带外` `光开销通道`
* 引入`前向纠错编码(FEC)`
* 引入`串行连接监控(TCM)`; 电的形式
* 标准化大容量光通道

## OTN与SDH的区别

![](/files/-LoJq5TNXYLXLZTLqgTx)

## OTN 的亮点

1. `超大容量`光传送系统
2. 全业务传送。传送分组数据。
3. 智能化

## OTN transport structure

![](/files/-LoJq5TPiO4PvTBIN3mM)

## OCh(Optical Channel) structure

![](/files/-LoJq5TRuu-OXHPPxwZ1)

![](/files/-LoJq5TTzp-YEhjd3RzY)

* OPUk = OPUk OH(开销) + OPUk净负荷(4\*3808)
* ODUk = ODUk开销 + OPUk
* OTUk = OTUk开销 + ODUk + FEC

> OPUk < ODUk < OTUk

* OCh = OCh + OTUk ; 1波
* OMSn = OMSn OH + OCh ; n波
* OTSn = OTS OH + OMSn ; n波


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