This case covers a failure of a cable between an IP Router and the OpticalNetwork Element. This scenario also covers a failure in the Port or Interface in the IP Router. There is no distinguishing symptom between the IP Router Interface failure and a failure in the cable between the IP Router and the Optical Network Element.

Figure 1. Case 3 – Failure between the IP Router and the Optical network

Depending on symptoms reported from the IP Manager, analysis may be:

  • A-side or Z-side Router Down

  • A-side Router Interface Down

  • IP NetworkConnection Down

    Optical Transport Manager analysis is:

  • DropSideTopologicalLink Down (for SDH, PDH, and WDM-NG)

  • FiberLink Down (for WDM)

    XD Manager OTM to IP analysis, in conjunction with Service Assurance Manager, is:

  • Root cause: Inter-Office Cable Down

  • Impacts:

    • Circuit ServiceUnavailable and

    • IP Network Connection Down or

    • A-side or Z-side Router Down or

    • A-side Router Interface Down