OTN – Lesson 9 – Video 1 – OTU Layer Source Direction Circuitry/Functionality – Part 1
This blog post contains a video that begins the discussion of the OTU-Layer Source Direction circuitry.
In particular, this video discusses the following Atomic Functions:
- The OTUk/ODUk_A_So Atomic Function, and
- The OTUk_TT_So Atomic Function.
The Role of the OTUk/ODUk_A_So Function
In short, the OTUk/ODUk_A_So Atomic Function is responsible for taking an ODUk client signal and mapping it into an OTUk server signal.
As the OTUk/ODUk_A_So Atomic function generate this OTUk server signal, it will insert default values for the OTUk Overhead fields, into its outbound OTU data-stream.
The Role of the OTUk_TT_So Function
The OTUk_TT_So Atomic Function will accept the OTU data-stream (from the upstream OTUk/ODUk_A_So Function) and will compute real (and correct) values for the OTU Overhead fields.