An all-optical Ethernet switch provides both optical uplink and downlink ports, and uses optical fibers that feature high transmission speed, large bandwidth, and strong anti-interference capability. It introduces common Ethernet switch port types. This guide is especially useful when selecting a 1G campus switch or upgrading to higher-performance Ethernet solutions. RJ45 ports serve access-layer copper connections; SFP/SFP+ ports enable flexible 1G/10G uplinks; SFP28 delivers 25G for modern data centers; QSFP+ and QSFP28 support high-density 40G/100G spine–leaf. All-optical Ethernet switches are a type of switch that provides optical uplink and downlink ports, making them an ideal choice for building an all-optical campus network. They can function as core, aggregation, and access devices on campus networks and connect to upstream and downstream devices. Switches come in three types: those with purely Ethernet ports, those with purely optical ports, and those with a combination of both. Port types are limited to two: optical and Ethernet. Ethernet switch ports are designed to align with these layers, and the main types include: An access port connects end devices like desktops, servers, and workstations to the network. These ports use twisted-pair copper cables (Cat5e, Cat6, Cat6a, etc.