The switch has a built-in optical module

Most switches do not come with optical modules included; these modules are usually purchased separately and inserted into the switch's optical ports.Optical Ports vs. ModulesSwitches with optical ports require optical modules to transmit data over fiber optic cables. These modules, such as SFP, SFP+, GBIC, XFP, or XENPAK, convert electrical signals to optical signals and vice versa, enabling communication over fiber networks . Optical ports on switches are designed to accommodate these modules, but the modules themselves are generally not included with the switch and must be selected based on the desired speed, distance, and interface type .All-Optical SwitchesAll-optical Ethernet switches provide optical uplink and downlink ports and are ideal for high-speed, all-fiber networks . While the switch has the physical ports ready for optical connections, the actual optical transceivers or modules are typically separate components. Users must install the appropriate module (e.g., 10GE, 25GE, 40GE, 100GE) to match the network requirements .Key ConsiderationsPort compatibility: Ensure the optical module matches the switch port type (e.g., LC, SC, MPO) and speed (e.g., 1G, 10G, 25G, 100G), .Distance requirements: Different modules support different transmission distances, from a few meters to over 100 km .Hot-swappable: Many modern modules, like SFPs, can be inserted or removed while the switch is powered on, simplifying upgrades and maintenance . In summary, while switches may have optical ports ready for fiber connections, optical modules are usually not included and must be purchased separately to enable fiber communication.