OTN – Lesson 7 – Converting OTL4.4 Back into an OTU4 Signal – Video 3

This post presents both information and video training on how we take an OTL4.4 signal and recombine it back into a composite OTU4 signal. This post serves as the third of 3 videos for the OTL4.4 Sink Terminal.

In this video we focus on the Lane Alignment Recovery Block and Skew Compensation.

OTN – Lesson 7 – Converting OTL4.4 Signals back into a Composite OTU4 Signal – Video 3

This blog post presents the 3rd (of a set of 3 videos) that discusses how we convert an OTL4.4 Interface (or set of signals) back into a single (composite) OTU4 signal.

In particular, this video discusses the following:

It discuss how the OTSiG/OTUk_A_Sk function declares and clears the dLOR (Loss of Recovery) defect condition, for each of the 20 Logical Lanes, by walking through the Lane Alignment Recovery Block – LOR/OOR/IR State Machine diagram.
This video also discusses Lane-to-Lane Skew Compensation, and
How the OTSiG/OTUk_A_Sk function declares or clears the dLOL defect condition, and
How the OTSiG/OTUk_A_Sk function combines the 20 Logical Lanes back into a single (composite) OTU4 signal.

Continue reading “OTN – Lesson 7 – Converting OTL4.4 Back into an OTU4 Signal – Video 3”

OTN – Lesson 7 – Converting OTL4.4 Back into an OTU4 Signal – Video 2

This post presents both information and video training on how we take an OTL4.4 signal and recombine it back into a composite OTU4 signal. This post serves as the second of 3 videos for the OTL4.4 Sink Terminal.

OTN – Lesson 7 – Converting OTL4.4 Signals back into a Composite OTU4 Signal – Video 2 of 3

This blog post contains the 2nd of 3 videos that discusses how we convert an OTL4.4 interface (or set of signals) back into a single (composite) OTU4 signal.

This particular video discusses how we declare and clear the dLOFLANE (Loss of Frame of Logical Lane) defect condition (by walking through the OTL4.20 dLOFLANE/In-Frame State Machine.

This video also starts the discussion of how we declare the dLOR (Loss of Recovery) defect for each of the 20 Logical Lanes.

Continue reading “OTN – Lesson 7 – Converting OTL4.4 Back into an OTU4 Signal – Video 2”

OTN – Lesson 7 – Converting OTL4.4 Back into an OTU4 Signal

This post presents both information and video training on how we take an OTL4.4 signal and recombine it back into a composite OTU4 signal. This post serves as the first of 3 videos for the OTL4.4 Sink Terminal.

This video introduces the OTL4.4 Sink Terminal (and the OTSiG/OTUk_A_Sk Atomic Function) and focuses on the Lane Frame Alignment Block and the dLOFLANE/In-Frame State Machine Diagram.

OTN – Lesson 7 – Converting OTL4.4 Signals back into a Composite OTU4 Signal – Video 1 of 3

This blog post contains the first (of 3) videos that describes how we take an OTL4.4 Interface (or set of signals) and converts these signals back into a single (composite) OTU4 signal.

This particular video introduces the OTSiG/OTUk_A_Sk Atomic Function (which is a fancy word for OTL4.4 Sink Terminal).

This video discusses how the OTSiG/OTUk_A_Sk Function accepts electrical lane signals from an Optical Module (in the OTL4.4 format) and processes these signals by:

Checking to see if we should declare/clear the dLOS-P (Loss of Signal – Path) Defect condition with these Electrical Lane signal, and
De-Multiplexing these signals into the 20 Logical Lane signal.

Continue reading “OTN – Lesson 7 – Converting OTL4.4 Back into an OTU4 Signal”

OTN – Lesson 9 – Video 11 – OTU Layer Defect Handling Requirements and Scenarios

In this video, we presume that some OTUk-Layer circuitry is declaring a certain defect condition. We then determine how OTU (and in some cases) ODU-layer circuitry is expected to respond.

OTN – Lesson 9 – Video 11 – OTU Layer Defect Scenarios

This blog post presents a video that discusses each of the various defects that OTN equipment can declare at the OTU Layer. Additionally, this video will describe how OTU Layer circuitry is expected to respond to and handle each of these defect conditions.

This video will state whether OTU Layer circuitry should:

Transmit the SM-BDI Indicator upstream, or
Transmit the ODU-AIS Maintenance Signal downstream,
Increment Certain Performance Monitoring parameters, or
Halt Incrementing Certain Performance Monitoring parameters.

In response to each of the type of defects that OTU Layer circuitry can declare.

This video covers both Single-Lane (e.g., OTSi/OTUk_A_Sk) and Multi-Lane (e.g., OTSiG/OTUk_A_Sk) applications.

Continue reading “OTN – Lesson 9 – Video 11 – OTU Layer Defect Handling Requirements and Scenarios”

OTN – Lesson 9 – Video 5 – Conclusion of OTSiG/OTUk_A_Sk Function

This post presents the 5th of 11 Videos that covers training on Performance Monitoring at the OTU Layer. This post focuses on the Sink Direction OTU-Layer Atomic Functions.

OTN – Lesson 9 – Video 5 – OTU Layer Sink Direction Circuitry/Functionality – Part 3

This blog post contains another video that focuses on (and wraps up our discussion on) the OTSiG/OTUk_A_Sk Atomic Function.

This video serves as Part 3, within our Sink (or Receive) Direction Analysis of OTU-Layer Atomic functions. This video is also the 5th of 11 videos within Lesson 9.

We start out this video by reviewing the complete list of defects that the OTSiG/OTUk_A_Sk function declares and clears. Afterward, I introduce you to the following:

The concept/purpose of Consequent Equations
A Review (and interpretation) of Consequent Equations for the OTSiG/OTUk_A_Sk Atomic Function.
Introduction to Defect Correlation
A Review of the Defect Correlation Equations for the OTSiG/OTUk_A_Sk Atomic Function.
A Review of the Performance Monitoring Equations for the OTSiG/OTUk_A_Sk Atomic Function.
A Final Summary of the OTSiG/OTUk_A_Sk Atomic Function.

Continue reading “OTN – Lesson 9 – Video 5 – Conclusion of OTSiG/OTUk_A_Sk Function”

OTN – Lesson 9 – Video 4 – OTSiG/OTUk_A_Sk Function/FEC Decoding/dLOM Defect

This post presents the 4th of 11 Videos that covers training on Performance Monitoring at the OTU-Layer. This post focuses on the Sink Direction OTU-Layer Atomic Functions.

OTN – Lesson 9 – Video 4 – OTU Layer Sink Direction Circuitry/Functionality – Part 2

This blog post contains a video that continues our discussion of the Sink (or Receive) Direction OTU-Layer Atomic Functions (circuitry).

This video serves as Part 2, for the Sink Direction/OTU-Layer Training Videos. It is also the 4th out of 11 Videos within Lesson 9.

This video discusses the following topics (still within the OTSiG/OTUk_A_Sk Atomic Function).

FEC Decoding, and
The Multi-Frame Alignment and dLOM (Loss of Multi-Frame) defect block.

In this case, we describe how the OTSiG/OTUk_A_Sk function declares and clears the dLOM (Loss of Multi-Frame) defect condition by walking through and discussing the dLOM/In-Multi-Frame Alignment State Machine diagram.

I wrap up this video by discussing why clearing the dLOM defect condition is important for handling/processing OTN signals.

Continue reading “OTN – Lesson 9 – Video 4 – OTSiG/OTUk_A_Sk Function/FEC Decoding/dLOM Defect”

OTN – Lesson 9 – Video 3 – OTU Layer Sink Direction Circuitry – Part 1

This post presents the 3rd of 11 Videos that covers training on Performance Monitoring at the OTU-Layer. This post focuses on the Sink-Direction OTU-Layer Atomic Functions.

OTN – Lesson 9 – Video 3 – OTU Layer Sink Direction Circuitry/Functionality – Part 1

This blog post contains a video that begins our discussion of the Sink (Receive) Direction OTU-Layer Atomic Functions.

This video starts out with a brief re-cap of a portion of the OTSiG/OTUk_A_Sk Atomic Function (aka OTL4.4 Sink Terminal).

In this case, I specifically call out and identify portions of this Atomic Function that we discussed in Lessons 6 or 7, as well as those portions that we did not.

NOTE: Back in Lesson 7, we discussed that part of the OTSiG/OTUk_A_Sk function that handled either OTL4.4 or OTL4.20 logical lane signals.
Additionally, back in Lesson 6, we discussed that part of the OTSiG/OTUk_A_Sk function that handled OTL3.4 lane signal.

I also show you the differences between the OTU3 version of OTSiG/OTUk_A_Sk function and that for OTU4.

Late in this video, we start to discuss that portion of the OTSiG/OTUk_A_Sk function that handles the combined (composite) OTU3/OTU4 signal. This includes

Discussing how the OTSiG/OTUk_A_Sk function declares and clears the dLOF defect, by reviewing the Frame Alignment Block – dLOF/In-Frame State Machine Diagram, and
Descrambling of the OTU3/OTU4 data-stream.

Continue reading “OTN – Lesson 9 – Video 3 – OTU Layer Sink Direction Circuitry – Part 1”