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. 

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OTN – Lesson 9 – Video 6 – OTU Layer Sink Direction Circuitry – OTSi/OTUk_A_Sk Function

This post presents the 6th of the 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 6 – OTU Layer Sink Direction Circuitry/Functionality – Part 4

This blog post contains a video that focuses on the OTSi/OTUk_A_Sk Atomic Function.  

In general, the OTSi/OTUk_A_Sk Function has many of the same features/functionality as does the OTSiG/OTUk_A_Sk Function.  

However, the OTSi/OTUk_A_Sk function supports the transport/reception of an OTU signal over a Single-Lane Connection (instead of 4 electrical lanes – such as the OTL3.4 or OTL4.4 Interface). Hence, we say that this Atomic Function is applicable to OTU1 and OTU2 applications.  

The main difference between the OTSi/OTUk_A_Sk function as that of the OTSiG/OTUk_A_Sk function, is that the OTSi/OTUk_A_Sk function will detect and declare the OTUk-AIS defect.  

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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”