fourport

Fourport is a term used in electronics to describe devices that provide four ports for connections. It is not a single standard, but a generic descriptor applied to several categories, including USB hubs, network switches, and power distribution devices that expose four input or output interfaces. The exact function depends on context, but common uses involve expanding connectivity or distributing power or signals among multiple devices while maintaining a single upstream or source connection.

In USB applications, a four-port USB hub remaps one upstream port to four downstream ports, enabling additional USB devices to be connected to a computer or host. Hubs can be bus-powered, drawing power from the host, or self-powered with an external supply, which supports higher power devices.

Networking uses: A four-port Ethernet switch or router provides four LAN interfaces. These devices are typically unmanaged in home use, enabling simple device-to-device connections, or managed in small businesses for traffic control. Speeds vary: 10/100 Mbps, 1000 Mbps (gigabit). Some four-port models include Power over Ethernet (PoE) to supply power to connected IP phones or cameras.

Other uses: In video or audio, four-port interfaces can connect outputs from media decoders, splitters, or routing devices. In power distribution, a four-port power strip or power distribution unit may provide four receptacles, sometimes with switched outlets or surge protection.

Because the term is generic, fourport usually appears in product names or descriptions rather than as a formal specification. Researchers and engineers may specify the exact port types, speeds, and electrical characteristics in the device's datasheet.