Hello,you may have heard that "WDM devices transport services transparently" or "the service encapsulation complies with ITU-T standards".Its hard to understand.
So the animation on service encapsulation and mapping can help you.Lets begin our twelve stop:Animation on Service Encapsulation and Mapping.

Visit http://support.huawei.com and search for “Service Encapsulation and Mapping” to learn more.

The pre link:

11.[A Trip to WDM]Board Signal Flow Animations

10.[A Trip to WDM]Network-level Protection (OTN)

9.[A Trip to WDM]Board Mechanism

8.[A Trip to WDM]Setting Subrack IDs

7.[A Trip to WDM]Animation on Optical Power Management

6.[A Trip to WDM]Clearing the Database of an SCC Board

5.[A Trip to WDM]Board Datasheet

4.[A Trip to WDM]WDM Basics At-A-Glance Animation on Multi-Wavelength

3.[A Trip to WDM]APP for Board Information Query Getting Everyting In Hand

2.[A Trip to WDM]Interactive Configuration Multimedia

1.[A Trip to WDM]Interactive Alarm Signal Flow

Very useful information

Dear tanjil,
Thank you for your feedback.