The total download traffic of broadband service in Japan has been increasing year by year, and the increase rate in 2019 is predicted to be around 20% over the previous year.(1) Passive optical network (PON) systems, which use optical fibers capable of transmitting and receiving a large amount of data, are widely used for residential services. The systems allow two or more subscribers to share a single optical fiber in order to efficiently deliver broadband services. Sumitomo Electric Industries, Ltd. developed and commercialized GE-PON (1 Gbps max.) in 2005 and 10G-EPON (10 Gbps max.) in 2011.(2)-(4) Meanwhile, when companies and public offices use a communication service, most of them subscribe to a Carrier Ethernet service instead of PON systems. This service provides each subscriber with one-to-one connections that do not share an optical fiber in order to assure the reliability of communications. Sumitomo Electric has newly developed FSU8100 series Ethernet access switches that enable Carrier Ethernet service. This paper describes an overall picture of the access switches.