Huawei GPHF C Huawei GPHF C is a 16-port Huawei NG OLT GPON interface card that provides access toGPON from the ONT. The GPHF, with 2.5 Gbps downlink and 1.25 Gbps uplink inserts, can access a maximum of 2048 subscriptions. The manual shutdown feature of idle PON ports prevents wasted power,and the use of 4-level HQoS (Hierarchical Quality of Service) technology and 9216 jumbo frames greatly improves the user experience.GPHF-C Board Features and Specifications16 GPON SFP ports- maximum divide ratio 1: 128- bi-directional unidirectional class B /C optical modules - received signal strength indicator (RSSI) detection and optical module signal transmission control- ONU based traffic shaping- Temperature readout and high temperature alarm- Automatic shutdown in case of high temperature- FEC (Forward Error Correction)- Type B / Type C protection- L3VPN and D-CCAP networks- maximum transmission range of 20 km- False ONU detection- GPON port optical power budget- Class B optics with 28.5 dB power budget (used in most cases)- Class C optics with 32 dB budget (used for long distance transmission)- Class C optics with 35 dB budget (used for long distance transmission)