‌GPBD (Huawei GPBD) is mainly used as an OLT device in the GPON/EPON system. Its functions and roles are similar to those of Huawei MA5680T, and it is a small and medium-capacity OLT device‌1. GPBD provides 13 slots, including 6 service board slots, 2 main control board slots, 2 GIU uplink board slo