The Cortina Systems® CS8021 Quad Gigabit Ethernet Passive Optical Network (GEPON or EPON) Optical Line Terminal (OLT) chip (CS8021) supports four EPON ports in a single chip to significantly simplify board design and lower the system Bill of Materials (BOM) cost. The CS8021 enables equipment vendors to develop a high port density chassis or stackable rack mount system targeted at the Central Office (CO).