Recommendation ITU-T G.9802.1 (08/2021) Wavelength division multiplexed passive optical networks (WDM PON): General requirements 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 Conventions 6 Architecture of the WR-ODN based WDM PON 6.1 System architecture overview 6.2 Common requirements 6.3 WR-ODN system reference layering 6.4 Compatibility and migration scheme 7 Service requirements 7.1 Service specific requirements 7.2 User network interfaces (UNI) 7.3 Service node interfaces (SNI) 7.4 Access node interfaces (ANI) 7.5 Synchronization and clock transfer 8 Physical layer requirements 8.1 Capacity 8.1.1 Aggregate capacity at OLT S/R-CG 8.1.2 Capacity at ONU 8.2 Support for multiple channel pairs 8.3 Wavelength router capability 8.4 Fibre type and fibre reach 9 System level requirements 9.1 Pay as you grow expectations 9.2 OLT side modularity 9.3 ONU side modularity 9.4 Interoperability 9.5 Security 10 Operational requirements 10.1 Provisioning method 10.2 Test and diagnostics function 10.3 System management and monitoring 10.4 System troubleshooting 10.5 Environmental and physical requirements 10.6 Energy saving objectives 10.7 Eye safety 11 Resilience and protection on ODN 11.1 Rogue behaviour prevention, detection and mitigation 11.2 CT failure protection 11.3 ODN failure protection Bibliography <\pre>