�1���� Scope����������
�2���� References
������� 2.1���� Normative references��������������
�3���� Terms and definitions����������
������� 3.1���� Terms defined elsewhere�������
������� 3.2���� Terms defined in this Recommendation�����������
�4���� Abbreviations and acronyms�������������
�5��� �Optical monitoring overview������������
�6���� Classification of monitoring methods������������
������� 6.1���� Signal monitoring�������
������� 6.2���� Equipment monitoring (indirect methods)������
������� 6.3���� Fibre link monitoring�
������� 6.4���� Monitoring based on received signals
������� 6.5���� Embedded monitoring equipment������
������� 6.6���� External monitoring equipment�����������
�7���� Optical impairments�������������
�8���� Optical monitoring parameters��������
�9���� Correlation between impairment effects and optical monitoring parameters
degradation�����
������� 9.1���� Variation of attenuation����������
������� 9.2���� Frequency (or wavelength) deviation from nominal����
������� 9.3���� Optical channel power changes due to gain variations
10���� Applications������������
11���� Optical safety considerations����������
12���� Security considerations������
Appendix I � Severity of optical impairments����
Appendix II � Penalty severity value X����
Appendix III � Optical monitoring performance����
����� III.1���� Optical signal-to-noise ratio measurement������
����� III.2���� Q-factor measurement (for up to approximately 10 Gbit/s
signals)��������
Appendix IV � Possible positions for suitable monitoring equipment and their
relative functions in several optical network elements����
������ IV.1���� Introduction�
������ IV.2���� Embedded monitoring points
������ IV.3���� External monitoring points�����
Appendix V � Parameter encoding����
������� V.1���� Wavelength ID (32 bits)�����������
������� V.2���� Parameter ID source (8 bits)��
������� V.3���� Parameter ID (8 bits)
������� V.4���� Value of parameters (32 bits)
Bibliography����