• Los in SDH

    From sunil kumar@21:1/5 to All on Mon Jul 13 21:46:48 2020
    Hi,

    Can some one please explain which Bytes are responsible for LOSS OF SIGNAL.

    BR,
    Sunil.

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  • From Huub van Helvoort@21:1/5 to You on Tue Jul 14 15:13:39 2020
    Hello Sunil,

    You asked:

    Can some one please explain which Bytes are responsible for LOSS OF SIGNAL.

    Loss Of Signal (LOS) means that the signal is too weak to be
    recovered, e.g too much attenuation, break in optical fiber,
    dirty connectors...

    Once a bitstream has been detected at the correct frequency the
    framer can start looking for the frame alignment words, until
    that moment the framer reports Loss Of Frame (LOF).
    Due to optical noise there may be too many bit-errors and
    framing will not be possible.

    Best regards, Huub.


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  • From sunil kumar@21:1/5 to Huub van Helvoort on Tue Jul 14 23:01:08 2020
    On Tuesday, July 14, 2020 at 6:43:41 PM UTC+5:30, Huub van Helvoort wrote:
    Hello Sunil,

    You asked:

    Can some one please explain which Bytes are responsible for LOSS OF SIGNAL.

    Loss Of Signal (LOS) means that the signal is too weak to be
    recovered, e.g too much attenuation, break in optical fiber,
    dirty connectors...

    Once a bitstream has been detected at the correct frequency the
    framer can start looking for the frame alignment words, until
    that moment the framer reports Loss Of Frame (LOF).
    Due to optical noise there may be too many bit-errors and
    framing will not be possible.

    Best regards, Huub.


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    Hi Hubb,

    thanks for the update.
    So the sequence will be like OOF LOF & LOS.

    Regards,
    Sunil.

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  • From Huub van Helvoort@21:1/5 to All on Thu Jul 16 19:11:28 2020
    Hello Sunil,

    You added:

    On Tuesday, July 14, 2020 at 6:43:41 PM UTC+5:30, Huub van Helvoort wrote:
    Hello Sunil,

    You asked:

    Can some one please explain which Bytes are responsible for LOSS OF SIGNAL. >>
    Loss Of Signal (LOS) means that the signal is too weak to be
    recovered, e.g too much attenuation, break in optical fiber,
    dirty connectors...

    Once a bitstream has been detected at the correct frequency the
    framer can start looking for the frame alignment words, until
    that moment the framer reports Loss Of Frame (LOF).
    Due to optical noise there may be too many bit-errors and
    framing will not be possible.

    Best regards, Huub.


    thanks for the update.

    You're welcome. Glad to help.

    So the sequence will be like OOF LOF & LOS.

    This will be the sequence when an optical signal degrades.
    Note that the OOF (Out of Frame) will be reported a short time.
    After consistency check it will be replaced by LOF (Loss of Frame).

    Best regards, Huub.


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