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| A switch box that routes an input signal to an output line e.g. to connect several computers to a single printer. |
 | Device that provides access to the system console of a computing device via networking technologies. Most commonly, a console server provides a number of serial ports, which are then connected to the serial ports of other equipment, such as servers, routers or switches. The consoles of the connected devices can then be accessed by connecting to the console server over a serial link such as a modem, or over a network with terminal emulator software such as telnet or ssh, maintaining survivable connectivity that allows remote users to log in the various consoles without being physically nearby. |
 | I/O refers to Input/Output, which is the transfer of data between the CPU and a peripheral device. I/O modules, which can be digital and analog, are self-contained components that interact between the CPU and peripherals. |
 | An interface is a point of interaction with software, hardware or peripheral devices such as a computer monitor or keyboard. An interface hub is where there are several interfaces together in one place. |
 | Also known as a terminal server, this is a device that enables you to connect devices with an RS-232, RS-422 or RS-485 serial interface to a local area network (LAN). |