Radisys’ Combo PON OLT is an open, flexible, highly scalable telco-grade white box designed to address service providers’ key needs. The white box OLTs are based on the VOLTHA/SEBA reference architecture and are field-hardened and scaled for commercial deployments today. The Combo OLT allows broadband providers to take advantage of pervasive G-PON technology while giving them a flexible upgrade path to scale up and rollout XGS-Pon deployments without costly rip and replace.
Source: https://www.helpnetsecurity.com/2021/07/14/radisys-combo-pon-optical-line-terminal/