Combination ports (and optical multiplexing ports) can support two different physical ports: an electrical port (RJ45 port) and an optical port (SFP port). Switches come in three types: those with purely Ethernet ports, those with purely optical ports, and those with a combination of both. Optical ports on switches typically accommodate optical modules for transmitting data via fiber optic cables. This paper compares the core differences between optical switches and electrical switches, clarifying their distinctions across seven key dimensions including signal conversion mechanisms, switching layers, latency, power consumption, and more. It also provides technical selection recommendations. Optical transceiver is a very cost effective and flexible device that is commonly used to convert electrical signals in twisted pair cables to optical signals. 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. A network switch is hardware that allows computers to communicate with each other. It accepts physical connectors from computers and other network devices and then uses packet switching to receive and forward data.
