OTN – Lesson 10 – Video 1M – Entire Source Direction Path – All Atomic Functions (ODU Multiplexed Applications)

This post presents the 1st of the 6 Videos that covers training on the Peformance Monitoring of the ODUk Layer (for Multiplexed Applications). This post focuses on the Source Direction ODU-Layer Atomic Functions.

OTN – Lesson 10 – Video 1 – The Entire Source Direction Path – All Atomic Functions (ODU Multiplexed Applications)

Check Out the Video Below

Click HERE to Go to Video 2 – The OTUk/ODUk_A_Sk and ODUk_TT_Sk Atomic Functions
Click HERE to return to the Main Lesson 10 Page – Multiplexed Applications

What We Cover in this Video

Video 1 (of the Multiplexed ODu4 System Videos) covers the following topics.

  • A brief review of Multiplexed Applications:
    • The PT = 0x20 Approach, and
    • The PT = 0x21 Approach
  • A brief review of the ITU-T G.798 Atomic Function’s support of the Multiplexed Applications
    • The ODUkP/ODU[i]j_A_So/Sk Functions (for PT = 0x20 Applications), and
    • The ODUkP/ODUj-21_A_So/Sk Functions (for PT = 0x21 Applications)
  • Our Application Example: 80 Channels of 1000BASEX -> ODU0 -> ODU4
  • ODU0P/CBR_ETC1000X-A_So (1Gbps Ethernet Adaptation Source Function)
  • Main Purpose: To take a 1000BASE-X (1Gbps Ethernet signal) and map this signal into an ODU0 signal using the GMP-TTT Mapping Procedure.
    • Generates a Default PMOH within the outbound ODU0 signal.
    • Sends the ODU0 signal towards the downstream ODU0_TT_So function for further processing
    • On-Board Clock Generator
      • Synthesizes a 1.244160 GHz Clock signal (e.g., the ODU0 bit-rates per ITU-T G.709) along with the AI_CK, AI_FS, and AI_MFS output signals to create an ODU0 signal.
    • ODU0 Overhead Settings
      • PT (Payload Type) within the PSI Message – set to 0x07 for 1000BASE-X mapped into an ODU0.
      • CI_SSF -> CSF bit-field within the outbound PSI Message (of OPU0 Frame)
  • ODU0_TT_So Function
  • Main Purpose: To compute a Real (and Correct) PMOH and insert data into its ODU0 data-stream.
    • The role of this function is very similar to what we described back in the discussion of the ODUk_TT_So function (in the Non-Multiplexed Portion of Lesson 10).
  • ODUkP/ODUj-21_A_So Function (ODUk to ODUj Multiplex Source Function)
  • Main Purpose: In this example, the ODUkP/ODUj-21_A_So function will map and multiplex 80 ODU0 signals into an OPU4/ODU4 server signal.
    • Convert each ODUj tributary signal into an Extended ODUj signal by attaching the FAS and MFAS fields to each ODUj frame.
    • APS Support
      • Within the ODUj Tributary Signal itself, and
      • Within the ODUk Server Signal
    • Can configure each ODUj tributary to operate in the Locked Mode (e.g., it overwrites the ODUj tributary signal with the ODUj-LCK Maintenance signal and maps/multiplexes that signal into the ODUk server signal.
    • Setting the PT byte (within the outbound ODUk server signal to 0x21).
    • Quick Review of the MSI bytes (within each outbound PSI Message).
    • The OMFI Byte-field (for ODU4 Multiplexed Applications ONLY).
    • We set the PMOH within the ODUk Server Signal to the Default Values. Route this signal to the downstream ODUk_TT_So Function.
  • ODUk_TT_So Function
  • Main Purpose: To compute a Real (and Correct) PMOH and insert data into its ODU4 data stream.
    • The role of this function is the same as what we described back in the discussion of the ODUk_TT_So function (in the Non-Multiplexed Portion of Lesson 10).
  • OTUk/ODUk_A_So Function
  • Main Purpose: To map an ODU4 client signal into the OTU4 Server signal.
    • The role of this function is the same as what we described back in the discussion of the ODUk_TT_So function (in the Non-Multiplexed Portion of Lesson 10).

In Figure 1, I highlight the Atomic Functions discussed in Video 1.

ODU4/OTU4 Multiplexed System with the Source Direction Atomic Functions Highlighted

Figure 1, Illustration of the ODU4/OTU4 System, with the Atomic Functions that we discuss in Video 2 highlighted

You Can Also Check Out the Video Below:

Click HERE to Go to Video 2 – The OTUk/ODUk_A_Sk and ODUk_TT_Sk Atomic Functions

Click HERE to return to the Main Lesson 10 Page – Multiplexed Applications

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