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PSU: Also called a power supply unit, the component that supplies power to a computer. Most personal computers can be plugged into standard electrical outlets. The power supply then pulls the required amount of electricity and converts the AC into DC current. It also regulates the voltage to eliminate spikes and surges common in most electrical systems. Not all power supplies, however, do an adequate voltage-regulation job, so a computer is always susceptible to large voltage fluctuations. P-frame: Short for predictive frame, or predicted frame, a video compression method used by the MPEG standard. In a motion sequence, individual frames of pictures are grouped together (called a group of pictures, or GOP) and played back so that the viewer registers the video’s spatial motion. 2-205 rule: A rule for the configuration of 100Base-T, or Fast Ethernet networks. According to the rule, the maximum network distance, or network diameter, of two non-stackable network hubs connected by copper cabling cannot exceed 205 metres (approx. 672 feet). Validation:
Verification that something is correct or conforms to a certain
standard. In data collection or data entry, it is the process of
ensuring that the data that are entered fall within the accepted
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