# 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 |
---|---|---|

cc-opr | Coherent channel power received. | dBm |

cc-opr-avg | Coherent channel power received (average). | dBm |

cc-opr-max | Coherent channel power received (maximum). | dBm |

cc-opr-min | Coherent channel power received (minimum). | dBm |

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 |

fec-0cr | Number of bits corrected to 0 | – |

fec-1cr | Number of bits corrected to 1 | – |

fec-ber | FEC bit error rate | – |

fec-ber-avg | FEC bit error rate (average) | – |

fec-ber-maximum | FEC bit error rate (maximum) | – |

fec-ber-minimum | FEC bit error rate (minimum) | – |

fec-ber-delta-q | Delta Q of x and y polarization | dB |

fec-ber-delta-q-min | Delta Q of x and y polarization (minimum) | dB |

fec-ber-delta-q-max | Delta Q of x and y polarization (maximum) | dB |

fec-ber-x-corr | X-polarization FEC bit error ratio | – |

fec-ber-x-corr-max | X-polarization FEC bit error ratio (maximum) | – |

fec-ber-x-corr-min | X-polarization FEC bit error ratio (minimum) | – |

fec-ber-x-q | X-polarization pre-FEC Q | dB |

fec-ber-x-q-max | X-polarization pre-FEC Q (maximum) | dB |

fec-ber-x-q-min | X-polarization pre-FEC Q (minimum) | dB |

fec-ber-y-corr | Y-polarization FEC bit error ratio | – |

fec-ber-y-corr-max | Y-polarization FEC bit error ratio (maximum) | – |

fec-ber-y-corr-min | Y-polarization FEC bit error ratio (minimum) | – |

fec-ber-y-q | Y-polarization pre-FEC Q | dB |

fec-ber-y-q-max | Y-polarization pre-FEC Q (maximum) | dB |

fec-ber-y-q-min | Y-polarization pre-FEC Q (minimum) | dB |

fec-bitcr | FEC bits corrected. | – |

fec-ucrcw | FEC uncorrectable codewords. | – |

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 |