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    Optical and Physical Layer Statistics

    Performance monitoring is conducted on a number of optical and physical layer attributes on UFMs and optical modules.

    Table 1: Optical Statistics

    Counter

    Description

    Units

    cd

    Chromatic dispersion.

    The chromatic dispersion of the received signal.

    ps/nm

    cd-avg

    Chromatic dispersion (average).

    ps/nm

    cd-max

    Chromatic dispersion (maximum).

    ps/nm

    cd-min

    Chromatic dispersion (minimum).

    ps/nm

    cfo

    Carrier frequency offset.

    The carrier frequency offset of the received signal.

    MHz

    cfo-avg

    Carrier frequency offset (average).

    MHz

    cfo-max

    Carrier frequency offset (maximum).

    MHz

    cfo-min

    Carrier frequency offset (minimum).

    MHz

    dgd

    Differential group delay.

    The differential group delay of the received signal.

    ps

    dgd-avg

    Differential group delay (average).

    ps

    dgd-max

    Differential group delay (maximum).

    ps

    dgd-min

    Differential group delay (minimum).

    ps

    lbc

    Laser bias current.

    mA

    lbc-avg

    Laser bias current (average).

    mA

    lbc-max

    Laser bias current (maximum).

    mA

    lbc-min

    Laser bias current (minimum).

    mA

    ltemp

    Laser temperature.

    °C

    ltemp-avg

    Laser temperature (average).

    °C

    ltemp-max

    Laser temperature (maximum).

    °C

    ltemp-min

    Laser temperature (minimum).

    °C

    opt-back-ref-ratio

    Optical back-reflection ratio

    The ratio of optical back reflection.

    dB

    opt-back-ref-ratio-min

    Optical back-reflection ratio (minimum)

    dB

    opt-back-ref-ratio-max

    Optical back-reflection ratio (maximum)

    dB

    opt-back-ref-ratio-avg

    Optical back-reflection ratio (average)

    dB

    opt-back-ref-ratio-std-avg

    Optical back-reflection ratio (standard deviation from average)

    dB

    opl-rx

    Optical power loss receive.

    The optical power loss in the receive direction.

    dB

    opl-rx-avg

    Optical power loss receive (average).

    dB

    opl-rx-max

    Optical power loss receive (maximum).

    dB

    opl-rx-min

    Optical power loss receive (minimum).

    dB

    opr

    Optical power received.

    dBm

    opr-avg

    Optical power received (average).

    dBm

    opr-max

    Optical power received (maximum).

    dBm

    opr-min

    Optical power received (minimum).

    dBm

    opr-std-avg

    Optical power received (standard deviation).

    An approximation of the variance of the power samples of the received optical signal.

    dBm

    opt

    Optical power transmitted.

    dBm

    opt-avg

    Optical power transmitted (average).

    dBm

    opt-max

    Optical power transmitted (maximum).

    dBm

    opt-min

    Optical power transmitted (minimum).

    dBm

    opt-std-avg

    Optical power transmitted (standard deviation).

    An approximation of the variance of the power samples of the transmitted optical signal.

    dBm

    opt-total

    Total (signal and noise) optical power transmitted.

    dBm

    opt-total-avg

    Total (signal and noise) optical power transmitted (average).

    dBm

    opt-total-max

    Total (signal and noise) optical power transmitted (maximum).

    dBm

    opt-total-min

    Total (signal and noise) optical power transmitted (minimum).

    dBm

    osnr

    Optical signal to noise ratio.

    The signal to noise ratio of the received optical signal.

    dB

    osnr-avg

    Optical signal to noise ratio (average).

    dB

    osnr-max

    Optical signal to noise ratio (maximum).

    dB

    osnr-min

    Optical signal to noise ratio (minimum).

    dB

    snr

    Signal to noise ratio.

    The signal to noise ratio of the received signal.

    dB

    snr-avg

    Signal to noise ratio (average).

    dB

    snr-max

    Signal to noise ratio (maximum).

    dB

    snr-min

    Signal to noise ratio (minimum).

    dB

    snr-x

    X-polarization signal to noise ratio.

    The X-polarization signal to noise ratio of the received optical signal.

    dB

    snr-x-avg

    X-polarization signal to noise ratio (average).

    dB

    snr-x-max

    X-polarization signal to noise ratio (maximum).

    dB

    snr-x-min

    X-polarization signal to noise ratio (minimum).

    dB

    snr-y

    Y-polarization signal to noise ratio.

    The Y-polarization signal to noise ratio of the received optical signal.

    dB

    snr-y-avg

    Y-polarization signal to noise ratio (average).

    dB

    snr-y-max

    Y-polarization signal to noise ratio (maximum).

    dB

    snr-y-min

    Y-polarization signal to noise ratio (minimum).

    dB

    span-lngth

    The span length.

    km

    Modified: 2017-04-13