Huawei S series devices support optical modules of the following encapsulation types: CFP, QSFP+, QSFP28, XFP, SFP, eSFP, and SFP+. All optical modules are hot swappable. SFP optical modules support LC fiber. An optical module is a component that completes electrical/optical conversion on an optical network. is a telecommunications network solutions provider. Depending on transmission rates, optical modules are classified into 100GE, 40GE, 25GE, 10GE, FE, and GE optical modules. Huawei GPON boards include GPON, XG-PON, XGS-PON, XG-PON&GPON Combo, XGS-PON&GPON Combo interface board, so there are these kinds of GPON optical modules corresponding.