The D3CMTS18 is a high-performance DOCSIS 3.1 Cable Modem Termination System designed to deliver reliable, high-capacity broadband access across modern HFC networks. With integrated DOCSIS and EQAM capabilities, it supports both OFDM and legacy SC-QAM channels, enabling operators to transition seamlessly from earlier DOCSIS generations. The system features a 10G combo SFP+ interface supporting 10G EPON, XG(S)-PON, or 10GE uplinks, providing flexible backhaul options for a wide range of deployment scenarios. An integrated RF module with optical receiver support ensures stable signal delivery and compatibility with existing RF platforms. The D3CMTS18 maintains full backward compatibility with DOCSIS 3.1, 3.0, 2.0, and C-DOCSIS environments.