Rec. ITU-T G.987.2 Amendment 2 (10/2020) 10-Gigabit-capable passive optical networks (XG-PON): Physical media dependent (PMD) layer specification
Summary
History
FOREWORD
Table of Contents
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
     6.2 Categories for fibre differential distance
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
          9.2.1 Line rate
               9.2.1.1 Downstream accuracy
               9.2.1.2 Upstream accuracy
          9.2.2 FEC code selection for XG-PON
          9.2.3 Physical media and transmission method
               9.2.3.1 Transmission medium
               9.2.3.2 Transmission direction
               9.2.3.3 Transmission methodology
          9.2.4 Line code
               9.2.4.1 Downstream
               9.2.4.2 Upstream
          9.2.5 Operating wavelength
               9.2.5.1 Downstream wavelength allocation
               9.2.5.2 Upstream wavelength allocation
          9.2.6 XG-PON PMD parameters
               9.2.6.1 XG-PON compatible ODN
               9.2.6.2 Optical interface parameters of 9.95328 Gbit/s downstream direction
               9.2.6.3 Optical interface parameters of 2.48832 Gbit/s upstream direction
          9.2.7 Transmitter at Old and Oru
               9.2.7.1 Source type
               9.2.7.2 Spectral characteristics
               9.2.7.3 Mean launched power
                    9.2.7.3.1 Launched optical power without input to the transmitter
               9.2.7.4 Minimum extinction ratio
               9.2.7.5 Maximum reflectance of equipment, measured at transmitter wavelength
               9.2.7.6 Mask of transmitter eye diagram
                    9.2.7.6.1 OLT transmitter
                    9.2.7.6.2 ONU transmitter
               9.2.7.7 Transmitter tolerance to reflected optical power
          9.2.8 Optical path between Old/Oru and Ord/Olu
               9.2.8.1 Attenuation range
               9.2.8.2 Minimum optical return loss of the cable plant at point R/S, including any connectors
               9.2.8.3 Maximum discrete reflectance between points S and R
               9.2.8.4 Dispersion
          9.2.9 Receiver at Ord and Olu
               9.2.9.1 Receiver sensitivity
               9.2.9.2 Receiver overload
               9.2.9.3 Maximum optical path penalty
               9.2.9.4 Maximum reflectance at R/S, measured at receiver wavelength
               9.2.9.5 Differential optical path loss
               9.2.9.6 Clock extraction capability
               9.2.9.7 Jitter performance
                    9.2.9.7.1 Jitter transfer
                    9.2.9.7.2 Jitter tolerance
                    9.2.9.7.3 Jitter generation
               9.2.9.8 Consecutive identical digit (CID) immunity
               9.2.9.9 Receiver tolerance to reflected power
               9.2.9.10 Transmission quality and error performance
10 X/S tolerance of XG-PON ONU and OLT
     10.1 Versatile WDM configuration
11 Upstream physical layer overhead
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
Appendix IV  Jitter budget specifications
     IV.1 The concept of jitter budget
     IV.2 Definition of test points
     IV.3 Jitter budget specification for XG-PON1
     IV.4 Jitter measurements for compliance to budget
Appendix V  Measurement of burst mode acquisition time and burst  mode eye opening at OLT
Bibliography