RAM
Random Access Memory - this is where the operating system, application programs, and data in current use are kept temporarily so that they can be quickly reached by the computer's processor.
RCA
Stands for Radio Corporation of America; handily used to describe jack and plug, one of the audio/video connectors.
RG59/U Cable
This is one of coaxial cables suitable for video transmission in CCTV system.
Router
A device on the Internet that determines the next network point to which a data should be forwarded.
Resolution
Measure of the ability of a CCTV system, or one of the components, to produce detail.
Retained Image
Also called image burn. A change produced in or on the target which remains for a large number of frames after the removal of a previously stationary light image and which yields a spurious electrical signal corresponding to that light image.
Remote Control
Referred to a device used to control the features of a piece of equipment without physically adjusting anything on the equipment.
RF (Radio Frequency)
The part of the electromagnetic spectrum, between about 3 kHz and 300 HHz, within which radio waves are transmitted.
Ripple
The term for amplitude variations in the output voltage of a power supply caused by insufficient filtering.
Roll
Refers to a loss of vertical synchronization which causes the picture to move up or down on a receiver or monitor.
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