The GPON OLT Class C+ HSC Huawei Optical Transceiver is a high-efficiency plug-in module specially engineered for Huawei's OLT systems. Ensure that the optical power is not overloaded. 1 Gbit/s and downlink service bandwidth is 2. It converts electrical signals into optical signals over fiber optic cables in the GPON network. Facilitating. Huawei GPON OLT C++ SFP is inserted in service board like GPFD GPBD GPBH GPHF etc and provides one or more transceiver module slot. Return Material Authorization (RMA) Process Standard Hardware Warranty Policy: Original new sealed ZTE product: 1 Year The Support Contacts: If your ZTE products failed, you must contact your sales.