OTN – Lesson 12 – APS Features within Atomic Functions – Part 2

This blog post presents a video that discusses the APS features within some fo the Atomic Functions that we discussed in Lesson 11.

Lesson 12 – Video 13 – Detailed Implementation of APS within the Atomic Functions – Video 2

This blog post continues our discussion of the APS features within various Atomic Functions. In this case, we will present how to implement Automatic Protection Switching in great detail. In particular, we will describe the following:

APS Features within the ODUT/ODU_A_So and ODUT/ODU_A_Sk functions (ODUT/TCM Layer – SNC/S Monitoring)
- How do we implement the APS features within these Atomic Functions to support TCM Layer i SNC/S Monitoring and Protection-Switching?
- How do we implement a complete System-Level design (using these atomic functions along with the ODUT_TT_So and ODUT_TT_Sk Atomic Functions)?
  - NOTE: We discussed these atomic functions in Lesson 11. However, we did not discuss the APS features (within those functions) then.

More specifically, we discuss how our system should implement APS and the APS Communication Protocol whenever the upstream ODUT_TT_Sk Atomic Function declares either a Service-Affecting or the TCMi-dDEG defect.

Check Out the Video Below

Continue reading “OTN – Lesson 12 – APS Features within Atomic Functions – Part 2”

OTN – Lesson 12 – Detailed Discussion of SNC/S Monitoring (Protection Switching)

This blog post presents a video that describes (in detail) SNC/S (Subnetwork Circuit Protection – Sublayer) Monitoring for Protection Switching.

Lesson 12 – Video 7 – Detailed Discussion of SNC/S (Subnetwork Circuit – Sublayer) Monitoring for Protection Switching

This blog post contains a video that presents a detailed discussion of SNC/S (Subnetwork Circuit – Sublayer) Monitoring for Protection Switching purposes at the ODU Layer.

In particular, this video will discuss the following topics:

A Detailed Review of SNC/S (Subnetwork Circuit Protection/Sublayer) Monitoring.
This video shows example locations/conditions of where we would use SNC/S Monitoring and why we would use this form of monitoring.
This video also highlights similarities of SNC/S with SNC/I Monitoring.
It also shows the differences between SNC/S and SNC/Ne or SNC/Ns monitoring.
Finally, this video reviews a Multi-Administrative Domain Network (and
Tandem Connection Monitoring) and describes how SNC/S works within a given “Protect Domain.”

Check Out the Video Below.

Continue reading “OTN – Lesson 12 – Detailed Discussion of SNC/S Monitoring (Protection Switching)”

OTN – Lesson 12 – Introduction to SNCP (Subnetwork Circuit Protection)

This blog post introduces the concept of SNCP (Subnetwork Circuit Protection) Switching. This post also briefling introduction SNCP Monitoring schemes such as SNC/I, CL-SNCG/I, SNC/Ne, SNC/Ns and SNC/S.

Lesson 12 – Video 3 – Introduction to SNCP (Subnetwork Circuit Protection) Switching

This blog post contains a video that covers the introductory part of Subnetwork Circuit Protection switching.

In particular, this video will discuss the following topics:

Introduction to the concept of Subnetwork Circuit Protection (SNCP)-Switching
- How is SNCP different from Trail Protection Switching
- Why does the Industry prefer SNCP Monitoring/Switching instead of Trail Protection Monitoring/Switching?
Introduction to the following forms of SNCP Monitoring:
- SNC/I – Subnetwork Circuit/Inherent Monitoring
- CL-SNCG/I – Compound Link – Subnetwork Circuit Group/Inherent Monitoring
- SNC/N – Subnetwork Circuit/Non-Intrusive Monitoring
  - SNC/Ne – Subnetwork Circuit/Non-Intrusive (End-to-End) Monitoring
  - SNC/Ns – Subnetwork Circuit/Non-Intrusive (Sublayer) Monitoring
- SNC/S – Subnetwork Circuit/Sublayer Monitoring

We will cover each of these monitoring forms (for Protection-Switching purposes), in much greater detail, throughout the remaining videos in Lesson 12.

In particular, we will cover these forms of SNCP Monitoring (in detail) in the following videos.

This particular video provides a broad overview of each of these forms of monitoring.

Check Out the Video Below

Continue reading “OTN – Lesson 12 – Introduction to SNCP (Subnetwork Circuit Protection)”

OTN – Lesson 11 – Tandem Connection Monitoring Multi-Administrative Domain Defect Analysis – Part TWO

This blog post contains the second of two videos that analyzes how the Multi-Administrative Domain uses Tandem Connection Monitoring to respond to service-affecting defects within an ODU signal passing through it.

Lesson 11 – Video 11 – Tandem Connection Monitoring (TCM) Multi-Administrative Domain Defect Analysis – Part TWO

This blog post contains a video covering the second (and final) part of the Multi-Administrative Domain Walk-Through when defects occur.

In particular, this video discusses how the Multi-Administrative Domain will respond to the presence of defects.

This video will analyze the Multi-Administrative Domain’s response to the following two cases.

Case 2 – Whenever a Service-Affecting defect occurs within Serving Operator Domain – Operator B, and

Case 3 – Whenever a Service-Affecting defect occurs within the Protect Domain.

NOTE: In the previous video, we analyzed Case 1 (Service-Affecting defect occurs within the ODU signal but outside of any of the administrative regions).

As we analyze the Multi-Administrative Domain’s response to these defects (for Cases 2 and 3), we will cover the following topics:

What exactly occurs within an ODU signal that experiences a service-affecting defect?
How do ODU-layer, ODUT-layer, and OTU-layer circuitry respond to such defects?
How does the circuitry within these Administrative Domains respond to the service-affecting defects associated with Cases 2 and 3?
What does the Path Terminating Equipment (at the remote terminal) do in response to these service-affecting defects?

This video will close out our discussion of Lesson 11 – Tandem Connection Monitoring.

Check Out the Video Below.

Continue reading “OTN – Lesson 11 – Tandem Connection Monitoring Multi-Administrative Domain Defect Analysis – Part TWO”

OTN – Lesson 11 – Tandem Connection Monitoring – Sink Atomic Functions – Video 5

This blog post includes a video that discusses both the ODUTm_TT_Sk (Non-Intrusive Monitoring) Function and the ODUT/ODU_A_Sk Atomic Function. This is the last blog post to describe and define the TCM-related Atomic Functions.

Lesson 11 – Video 7 – Tandem Connection Monitoring – ODUTm_TT_Sk and ODUT/ODU_A_Sk Atomic Functions

This blog post contains a video that covers the fifth part of the Sink Direction Tandem Connection Monitoring (TCM) related Atomic Functions.

In particular, this video covers the following two atomic functions:

ODUTm_TT_Sk (Atomic Function for Non-Intrusive Monitoring – TCM Applications), and
ODUT/ODU_A_Sk

More specifically, this video covers the following aspects of each of these Atomic Functions.

ODUTm_TT_Sk Atomic Function
- Applications in which we would use the ODUTm_TT_Sk Atomic Function (e.g., Non-Intrusive Monitoring for TCM Subnetworks)
- A brief overview of this function’s capabilities and attributes
- How this function differs from the ODUT_TT_Sk Atomic Function?
  - When the ODUT_TT_Sk Function is operating in the OPERATIONAL Mode
  - If the ODUT_TT_Sk Function is running in the MONITOR Mode, and
  - When the ODUT_TT_Sk Function is working in the TRANSPARENT Mode
ODUT/ODU_A_Sk Atomic Function
- Where this function fits into the Tandem Connection Monitoring Network
- The Architecture/Functionality of the ODUT/ODU_A_Sk Function
  - Operation in the various TCM Modes (e.g., OPERATIONAL and MONITOR/TRANSPARENT).
  - The Protection Port (for Automatic Protection Switching support).
  - The Removal Block – How this function terminates the “Selected TCMOH and APS/PCC field.”
  - Replacing the Normal ODU signal (carrying client data) with either the ODU-AIS or ODU-LCK Maintenance Signals.
  - Asserting CI_SSF and CI_SSD in response to upstream defect conditions.

This video completes our discussion/review of the TCM-related Atomic Functions.

Check Out the Video Below.

Continue reading “OTN – Lesson 11 – Tandem Connection Monitoring – Sink Atomic Functions – Video 5”