OTN – Lesson 6 – Converting OTL3.4 Back into OTU3 – Video 1

This blog post contains a Video that serves as a first (of two) videos that discusses the functionality of the OTL3.4 Sink Terminal (aka OTSiG/OTUk_A_Sk Function). This video focuses on the dLOFLANE and dLOR defects.

OTN – Lesson 6 – Converting OTL3.4 Signals back into a Composite OTU3 Signal – Video 1 of 2

This blog post contains the first (of 2) videos that describe how we take an OTL3.4 Interface (or set of signals) and convert these signals back into a single (composite) OTU3 signal.  

This particular video introduces the OTSiG/OTUk_A_Sk Atomic Function (which is a fancy word for OTL3.4 Sink Terminal).

This video discussed how the OTSiG/OTUk_A_Sk Function accepts electrical lane signals from an Optical Module (in the OTL3.4 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 signals, and 
  • Checking to see if we should declare/clear the dLOFLANE (Loss of Frame – of Logical Lane) defect condition.
  • Finally, we will discuss how the OTSiG/OTUk_A_Sk function checks each incoming OTL3.4 lane signal to see if it should declare the dLOR (Loss of Recovery) defect condition.  

Continue reading “OTN – Lesson 6 – Converting OTL3.4 Back into OTU3 – Video 1”

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 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 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”