�1���� Scope��������
�2���� References�������������
�3���� Definitions
�4���� Abbreviations and acronyms�����������
�5���� Conventions�����������
�6���� Architecture of the optical access network��
������� 6.1���� Classes for optical path loss���
�7���� Services����
�8���� User network interface and service node interface��
�9���� Optical network requirements��������
������� 9.1���� Layered structure of optical network�
������� 9.2���� Physical media dependent layer requirements for the XG-PON
10���� X/S tolerance of XG-PON ONU��������
� �����10.1���� Versatile WDM configuration������������
11���� Upstream physical layer overhead�
12���� Mid-span reach extenders for XG-PON�������
Appendix I � Examples of wavelength allocation for XG-PON, G-PON� and video
distribution services����
Appendix II � Physical layer measurements required to support optical layer
supervision����
Appendix III � Allocation of the physical layer overhead time����