Computer Ports and Cables

Computer devices connect together using a variety of different types of cables. Monitors, screens, TVs and projectors usually connect to your computer using VGA, DVI or HDMI.

Peripherals such as printers, scanners, as well as mass storage devices such as external hard drives and flash drives connect to your computer using USB.

For more detail be sure to check out our guide Essential Computing: Concepts of ICT. Click the links for more information.

Ports

On the back of your computer, you’ll see something similar to the following. Here you can see the commonly used ports to connect devices to your PC.

USB 2

USB 2 transfers data at about 480 ‘mega bits per second’. Now, no one uses mega bits and the term is a bit misleading. The actual data transfer rate is about 60 Megabytes per second.

USB 3

USB 3 transfers data at about an impressive sounding 5 ‘giga bits per second’. However, translate that into every day terms, the actual data transfer rate is about 640 Megabytes per second. This makes them ideal for external hard drives and other high speed devices. Note the blue colour coding on the end of the plug.

Ethernet

Used to connect to networks, routers, modems and so on. Can transfer data at 100Mbps on some cables and 1Gbps – 10Gbps on high speed cables.

VGA

VGA is an old school connector and can handle resolutions up to 2048×1536 but is an analog signal. This connector carries no audio.

DVI

A digital interface for connecting to computer monitors and projectors. It comes in three types

DVI-I. Integrated, combines digital and analog in the same connector; digital may be single or dual linkDVI-D. Digital only, single link or dual linkDVI-A. Analog only

HDMI

An interface for connecting to TVs, monitors, projectors, set top boxes, dvd/bluray players, media streaming devices and so forth. This interface carries both digital audio and video on a single cable.

Be sure to check out our guides for more detailed information. Essential Computing: Concepts of ICT. Click the links for more information.

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