Rec. ITU-T G.984.2 (08/2019) - Gigabit-capable passive optical networks (GPON): Physical media dependent (PMD) layer specification
Summary
History
FOREWORD
Table of Contents
1 Scope
2 References
3 Definitions
     3.1 Terms defined elsewhere
     3.2 Terms defined in this Recommendation
4 Abbreviations and acronyms
5 Architecture of the optical access network
6 Services
7 User network interface and service node interface
8 Optical network requirements
     8.1 Layered structure of optical network
     8.2 Physical medium dependent layer requirements for the GPON
          8.2.1 Digital signal nominal bit rate
          8.2.2 Physical media and transmission method
               8.2.2.1 Transmission medium
               8.2.2.2 Transmission direction
               8.2.2.3 Transmission methodology
          8.2.3 Bit rate
               8.2.3.1 Downstream
               8.2.3.2 Upstream
          8.2.4 Line code
          8.2.5 Operating wavelength
               8.2.5.1 Downstream direction
               8.2.5.2 Upstream direction
          8.2.6 Transmitter at Old and Oru
               8.2.6.1 Source type
               8.2.6.2 Spectral characteristics
               8.2.6.3 Mean launched power
                    8.2.6.3.1 Launched optical power without input to the transmitter
               8.2.6.4 Minimum extinction ratio
               8.2.6.5 Maximum reflectance of equipment, measured at transmitter wavelength
               8.2.6.6 Mask of transmitter eye diagram
                    8.2.6.6.1 OLT transmitter
                    8.2.6.6.2 ONU transmitter
               8.2.6.7 Tolerance to the reflected optical power
          8.2.7 Optical path between Old/Oru and Ord/Olu
               8.2.7.1 Attenuation range
               8.2.7.2 Minimum optical return loss of the cable plant at point R/S, including any connectors
               8.2.7.3 Maximum discrete reflectance between points S and R
               8.2.7.4 Dispersion
          8.2.8 Receiver at Ord and Olu
               8.2.8.1 Minimum sensitivity
               8.2.8.2 Minimum overload
               8.2.8.3 Maximum optical path penalty
               8.2.8.4 Maximum logical reach
               8.2.8.5 Maximum differential logical reach
               8.2.8.6 Maximum reflectance of receiver equipment, measured at receiver wavelength
               8.2.8.7 Differential optical path loss
               8.2.8.8 Clock extraction capability
               8.2.8.9 Jitter performance
                    8.2.8.9.1 Jitter transfer
                    8.2.8.9.2 Jitter tolerance
                    8.2.8.9.3 Jitter generation
               8.2.8.10 Consecutive identical digit immunity
               8.2.8.11 Tolerance to reflected power
               8.2.8.12 Transmission quality and error performance
     8.3 Interaction between GPON PMD layer and TC layer
          8.3.1 Forward error correction
          8.3.2 Power levelling mechanism at ONU transmitter
          8.3.3 Upstream physical layer overhead
Annex A   Industry best practice for 2.488 Gbit/s downstream,  1.244 Gbit/s upstream GPON class B+
     A.1 Introduction
     A.2 System applications
     A.3 Optical specifications
     A.4 Link budget
Annex B  Description of physical layer measurements to  support optical layer supervision
     B.1 Introduction
     B.2 Transceiver parameters monitoring
     B.3 Measurement table for transceiver parameters
     B.4 OLS physical layer performance measurements requirements
Appendix I  Allocation of the physical layer overhead time
Appendix II  Description and examples of power levelling mechanism
     II.1 Introduction
     II.2 ONU levels
     II.3 Thresholds at OLT
          II.3.1 Case 1: Comparison to two thresholds (TL, TH)
          II.3.2 Case 2: Comparison to one threshold (TL)
     II.4 Power detection
Appendix III
Appendix IV
Appendix V  Industry best practice for single-sided extended 2.488 Gbit/s downstream, 1.244 Gbit/s upstream GPON (class C+ and class D)
     V.1 Introduction
Bibliography