The Huawei H901GPHF 16 ports GPON board for MA5800 OLT (C+ SFP modules included) (Part number: H901GPHF C+) from Huawei is a ONT (Optical Network Terminal). Optical network terminal is a device used in fiber optic systems to convert optical signals into electrical signals for TV, voice, and data. Huawei H901GPHF 16 ports GPON board for MA5800 OLT (C+ SFP modules included) The H901GPHF board is a 16-port GPON Interface Board. It works together with the optical network terminal (ONU) to provide GPON access services. Feature and Specifications The H901GPHF board supports the following features and specifications: 16 GPON SFP ports A maximum of 1:128 split ratio Class B+/C+/C++ one-fiber bi-directional optical modules Received signal strength indicator (RSSI) detection and optical signal transmission control of the optical module ONU-based traffic shaping Temperature reading and high-temperature alarm Automatic power-off in case of high temperature Upstream and downstream forward error correction (FEC) Type B/Type C protection L3VPN and D-CCAP networking A maximum of 20 km transmission distance Rogue ONU detection Optical power budget of the GPON port Class B+ optical module with a 28.5 dB power budget (used in most cases) Class C+ optical module with a 32 dB budget (used for long-distance transmission) Class C++ optical module with a 35 dB budget (used for long-distance transmission)