ATOP XGS Combo Class D is a combination of XGS-PON OLT and GPON OLT optical transceiver in a SFP+ housing, and it is compliant to ITU-T G.9807.1 XGS-PON and ITU-T G.984.2 GPON standard. This module can support XGS-PON and GPON over a single fiber via coarse wave division multiplexing. XGS-PON feature supports 9.953 Gbps continuous-mode transmission by 1577 nm EML laser and 9.953/2.488 Gbps burst-mode reception by 1270 nm APD/TIA. GPON feature supports 2.488 Gbps continuous-mode transmission by 1490 nm DFB laser and 1.244 Gbps burst-mode reception by 1310 nm APD/TIA. It has been designed to meet the harshest external operating conditions that include temperature, humidity and EMI interference. The module offers very high functionality and feature integration, accessible via a two-wire serial interface.