# OTN (Optical Transport Network)

## Tech Terms

![](https://2889346953-files.gitbook.io/~/files/v0/b/gitbook-legacy-files/o/assets%2F-Le4Kw7maZEabKFjsC7z%2F-LoJq-xqDgqGQuOyPcDo%2F-LoJq5TJDydeTN3TWDTf%2FOTN%20Acronyms.png?generation=1568012792619992\&alt=media)

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

![](https://2889346953-files.gitbook.io/~/files/v0/b/gitbook-legacy-files/o/assets%2F-Le4Kw7maZEabKFjsC7z%2F-LoJq-xqDgqGQuOyPcDo%2F-LoJq5TNXYLXLZTLqgTx%2FThe%20difference%20between%20OTN%20and%20SDH.png?generation=1568012791172109\&alt=media)

## 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

![](https://2889346953-files.gitbook.io/~/files/v0/b/gitbook-legacy-files/o/assets%2F-Le4Kw7maZEabKFjsC7z%2F-LoJq-xqDgqGQuOyPcDo%2F-LoJq5TPiO4PvTBIN3mM%2FBasic%20OTN%20transport%20structure.png?generation=1568012791633833\&alt=media)

## OCh(Optical Channel) structure

![](https://2889346953-files.gitbook.io/~/files/v0/b/gitbook-legacy-files/o/assets%2F-Le4Kw7maZEabKFjsC7z%2F-LoJq-xqDgqGQuOyPcDo%2F-LoJq5TRuu-OXHPPxwZ1%2FOptical%20Channel%20Structure.png?generation=1568012790992845\&alt=media)

![](https://2889346953-files.gitbook.io/~/files/v0/b/gitbook-legacy-files/o/assets%2F-Le4Kw7maZEabKFjsC7z%2F-LoJq-xqDgqGQuOyPcDo%2F-LoJq5TTzp-YEhjd3RzY%2FOTN%20frame%20structure.png?generation=1568012791103283\&alt=media)

* 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