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  • #41945 Reply

    I have an STM1 with a work and protect path. I have soft loops on both w & p at the far end and am running a 24 hr BER test at my end. I am not sure if MSP has been configured on the SDH / ADM at any NE in the path.

    2 ISSUES

    1. I have 1 test set connected on EACH pair (work and protect)
    When I inject errors on the working pair, I see the error come back to me, as it should. But the error is also received on the protect pair.
    I cannot inject an error on the protect pair.
    What could be the reason.

    2. I ran a 24 hour test on both the pairs and noticed 17 instances of AU-PJE (Pointer Justification Event) What does this mean?

    Thanks & Regards,

    #41946 Reply

    If you have an STM-1 with worker and protection path, that suggests they are they linked in some way? I suspect MSP has been set up between you and your provider. As a result you actually only have one cct that is protected rather than 2 ccts one used as a main/worker path and one a protection. MSP explains why the injected errors on the worker are seen on the protection and the protection test doesn’t work as you expected.

    To clear AU-PJE errors either move the loop closer or get the provider to investigate. I suspect a possible sync / clocking issue.

    Good luck

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