Can PoE switches with optical ports be connected in series

Yes, the optical (SFP/fiber) ports of PoE switches can be connected in series using proper uplink or cascade connections, but PoE power is not transmitted over fiber.Key ConsiderationsFiber vs PoE: PoE switches provide power over Ethernet through copper RJ-45 ports, not through optical ports. When connecting switches via fiber, the fiber link carries only data, not electrical power. Therefore, powered devices connected to the fiber link will not receive PoE; they must be connected to a PoE-enabled copper port on the switch . Using SFP or Uplink Ports: To connect two PoE switches in series over long distances, you typically use the SFP (Small Form-factor Pluggable) slots with fiber modules. Each switch requires an SFP module, and the fiber cable links the two modules. If a switch lacks an SFP port, a media converter can be used to convert between copper and fiber signals . Series (Cascade) Connections: Standard practice allows switches to be cascaded using uplink or dedicated cascade ports. When using PoE ports for cascading, only switches with standard PoE chips that can detect powered devices should be used; otherwise, connecting PoE ports in series incorrectly can damage devices . For fiber uplinks, the series connection is safe because the fiber link does not carry power, only data . Performance Considerations: Cascading multiple switches can increase network latency and reduce available bandwidth if the uplink capacity is insufficient. It is recommended to use high-speed uplinks (e.g., Gigabit or 10G SFP) for series connections to avoid bottlenecks .Practical Setup StepsInsert SFP modules into the SFP slots of both PoE switches.Connect the fiber optic cable between the SFP modules.If one switch lacks an SFP slot, use a media converter to convert the fiber signal to copper Ethernet.Connect powered devices to the PoE-enabled copper ports on each switch.Configure VLANs or trunking if needed to maintain network segmentation across cascaded switches. Summary: Optical ports on PoE switches can be connected in series for data transmission, but they do not transmit PoE. Always use proper SFP modules or media converters, and connect powered devices to copper PoE ports to ensure safe and reliable operation .