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Q
QUXGA - Quad UXGA, A Display Standard referring to a video adapter capable of a resolution of up to 3200 by 2400 pixels with an aspect ratio of 4:3. @teqgear
QXGA - Quantum extended graphics array (Quantum XGA), screen resolution of 2048x1536 pixels with an aspect ratio of 4:3. @teqgear
R
Rack unit - A unit of measurement of the height of a rack-mounted device. One rack unit, or 1U, is 1.75" (inches). @teqgear
Radio frequency (RF) - Range of electromagnetic waves with a frequency or wavelength suitable for utilization in radio communication. (e.g. radio and TV) @teqgear
RAM - Random Access Memory. A group of memory chips, typically of the dynamic RAM (DRAM) type, which function as the computer's primary workspace. When personal computers first came on the market in the late 1970s, 64KB (64 kilobytes) of RAM was the upper limit. @teqgear
RCA plug - A plug and socket for a two-wire (signal and ground) coaxial cable that is widely used to connect analog audio and video components. Also called a "phono connector," rows of RCA sockets are found on the backs of stereo amplifiers and numerous A/V products. The prong is 1/8" thick by 5/16" long. @teqgear
Remote control - This device controls an activity, process, or machine from a distance, as by radioed instructions or coded signals. @teqgear
Resistance - Opposition of a circuit to the flow of electric current. Resistance is measured in ohms. @teqgear
Resolution - The degree of sharpness of a displayed or printed character or image. Resolution is expressed as a matrix of dots or the density of lines or dots that make up an image. Resolution determines the detail and quality of the image. A measure of the ability of a camera or video system to reproduce detail, or the amount of detail that can be seen in an image. A sharp, clear picture is due to high resolution. @teqgear
Return loss - A measure of reflected energy in decibels at a specific frequency and cable length. @teqgear
RGB - Red, Green, and Blue. The basic components of the color television system. @teqgear
RGBHV - Red, Green, Blue, Horizontal Sync, and Vertical Sync. A five-wire signal where the red, green, and blue video signals, as well as the horizontal and vertical sync signals, are on its own conductor. @teqgear
RGBS - Red, Green, and Blue chroma information in a video signal, with Sync signal. @teqgear
RGsB - Red, Green, Sync signal and Blue. A three-wire signal with separate red, green, and blue video signals with the sync (horizontal and vertical) on the green signal. @teqgear
Ripple - Form or display little undulations or waves on the surface. Generally referring to the wavelike variations in the amplitude response of a filter. @teqgear
RJ-45 - Registered Jack-45. It is a telephone connector that holds up to eight wires. RJ-45 plugs and sockets are used in Ethernet devices. @teqgear
RS-232 - Recommended Standard-232. A TIA/EIA standard for serial transmission between computers and peripheral devices (switcher, modem, mouse, etc.). Using a 25-pin DB-25 or 9-pin DB-9 connector, its normal cable limitation of 50 feet can be extended to several hundred feet with high-quality cable. @teqgear
RS-422 - It is a serial data communication protocol which specifies 4 wire, full-duplex, differential line, multi-drop communications. It provides for balanced data transmission with unidirectional/non-reversible, terminated or non-terminated transmission lines. This standard is usable over longer distances than RS-232. This signal governs the asynchronous transmission of computer data at speeds of up to 920kbits per second. @teqgear
RS-485 - A TIA/EIA standard for serial multipoint communications lines. By using lower-impedance drivers and receivers, RS-485 allows more nodes per line than RS-422. @teqgear

S
S-video - Super-video. A video color format that combines the three video signals (YUV) into two channels. Brightness/luma (Y) is in one channel, and second one is color/chroma (U and V). S-video provides a sharper image than composite video, but is not as good as component video. @teqgear
Scaler - An electronic circuit that resizes an input signal to fit on a screen with a higher or lower resolution. It may also refer to software that resizes graphics or video. @teqgear
Scan converter - A device that changes the video output from a computer to standard TV signals, allowing a regular TV to be used as a computer screen. Examples: computer-video to NTSC (TV). @teqgear
SDI - Serial Digital Interface. These standards are used for transmission of uncompressed, unencrypted digital television signals (optionally including audio) within television facilities. The standard based on a 270 Mbps transfer rate. @teqgear
Seamless switching - A feature found on many video switchers. This feature causes the switcher to wait until the vertical interval to switch. This avoids a glitch which normally is seen when switching between sources. @teqgear
Serial port - Connection by which a computer can transmit data to another device using Serial Transmission. Serial ports on a PC are commonly designated as COM1 and COM2. The serial port is used with RS-232 protocol to control our switchers and matrix switchers. @teqgear
Signal loss - A video problem that shows up as a faint picture for lack of video information. @teqgear
Signal to Noise ratio - The ratio of the amplitude of a desired signal at any point to the amplitude of noise signals at that same point; often expressed in decibels; the peak value is usually used for pulse noise, while the root-mean-square (rms) value is used for random noise. Abbreviated S/N; SNR. @teqgear
Software - The programs used to instruct a processor and its peripheral equipment to perform prescribed operations. @teqgear
Static IP - An IP address that has been specifically assigned to a device or system in a network configuration. This type of address requires manual configuration of the actual network device or system and can only be changed manually or by enabling DHCP. @teqgear
Stereo - A process of using separate audio signals on separate channels for the left and right audio, thereby giving depth, or dimension to the sound. @teqgear
Subnet mask - The method used for splitting IP networks into a series of subgroups or subnets. The mask is a binary pattern that is matched up with the IP address to turn part of the host ID address field into a field for subnets. @teqgear
SVGA - Super Video Graphics Array. A term used to denote resolutions higher than VGA (640 x 480). SVGA computer graphics cards have a resolution of 800 x 600 (480,000 pixels) but may be able to output resolutions of up to 1280 x 1024 and 16 million colors at an aspect ratio of 4:3. @teqgear
Switcher - A device that allows a selection between more than one source, such as video cameras, VCRs, etc. In audio/video, switchers are a means of connecting many input sources to an output device or a system. Teq Gear offers switchers ranging from 8x1 to 32x1. @teqgear
SXGA - Super Extended Graphics Array. A graphics standard with a resolution of 1280 x 1024 (1,310,720 pixels), with an aspect ratio of 5:4. This exceeds XGA (1024 x 768, at 786,432 pixels). @teqgear
SXGA+ - Introduced in 2004, a graphics standard with a resolution of 1400 x 1050 (1,470,000 pixels) with an aspect ratio of 4:3. @teqgear
Sync - Synchronization. In video, sync is a means of controlling the timing of an event with respect to other events. This is accomplished with timing pulses to insure that each step in a process occurs at the correct time. For example, horizontal sync determines exactly when to begin each horizontal scan line. Vertical sync determines when the image is to be refreshed to start a new field or frame. There are many other types of sync in a video system. (Also known as "sync signal" or "sync pulse.") @teqgear
T
TCP - Transmission Control Protocol. A method or protocol used along with the Internet Protocol to send data in the form of message units between computers over the Internet. While IP takes care of handling the actual delivery of the data, TCP takes care of keeping track of the individual units of data or packets that a message is divided into for efficient routing through the Internet. @teqgear
TCP/IP - Transmission Control Protocol/Internet Protocol. The communi­cation protocol of the Internet. Computers and devices with direct access to the Internet are provided with a copy of the TCP/IP program to allow them to send and receive information in an understandable form. @teqgear
Telnet - A computer network utility available on most PCs that allows the computer system to communicate with one of its remote users or clients. A user who wishes to access a remote system initiates a Telnet session using the address of the remote client. The user may be prompted to provide a user name and password if the client is set up to require them. @teqgear
Termination - 1. A load or impedance at the end of a cable or signal line used to match the impedance of the equipment that generated the signal. The impedance absorbs signal energy to prevent signal reflections from going back toward the source. For video signals, termination impedance is typically 75 ohms; for sync signals, it is usually 510 ohms. 2. A connector at the end of a cable. @teqgear
Touch panel - A control panel with a flat surface (usually with graphic divisions or buttons) that functions as a switch or control. Also called a "touch screen." @teqgear