Coax uses - Multimedia Coax Alliance (MoCA)
Modem: ARRIS TM822G
Router: D-Link DIR-868L 802.11ac
STB: Samsung SMT-C5320 - HDMI, Component, Composite, IEEE1394, S-Video, Audio L/R, S/PDIF (Optical)

Links:
Optimum Online - ARRIS TM822G modem
Optimum Online - Samsung HD Digital Cable Box
D-Link DIR-868L Router Technical Support