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720P 720p is the shorthand name for a category of HDTV video modes. The number 720 stands for the 720 horizontal scan lines of display resolution (also known as 720 pixels of vertical resolution), while the letter p stands for progressive scan or non-interlaced.
A/B SWITCH It's a switcher that has RF inputs rather than RCA. You can toggle between two separate coaxial signals on a single viewing display. They connect to 75 Ohm cable and their design varies in style from a simple, metallic casing to a plastic design with remote control capabilities.
ANALOG TV An analog TV signal is made up of a video signal broadcast on AM radio waves, and an audio signal broadcast on FM waves. Analog technology is currently being replaced by digital technology throughout the world.
ASPECT RATIO If you are new to the concept, when we talk about 16:9 or 4:3 or 2.35:1 formats, we're talking about the rectangular shape of the video image, or what is called its aspect ratio. The standard TV that's been around since the mid-50s has an aspect ratio of 4:3. That means the picture is 4 units wide for every three units of height. Meanwhile, the new HDTV standard is 16:9, which is 16 units of width for every 9 units of height. So HDTV's 16:9 is a rectangle that is, relatively speaking, horizontally wider than older TVs, which by comparison look almost square.
BNC  The basic BNC connector is a male type mounted at each end of a cable. This connector has a center pin connected to the center cable conductor and a metal tube connected to the outer cable shield. A rotating ring outside the tube locks the cable to any female connector.
BOX CAMERA Box cameras provide the most flexibility when designing a security camera system. With box cameras, you can easily interchange lenses and control the angle of view and magnification (zoom) allowing for precise recording of your subjects. With the control capabilities of our box cameras; you can achieve high quality results even under the most undesirable lighting conditions.

Box cameras are not weatherproof cameras so they are normally used in indoors however, because of their great flexibility, they can be installed within a weather proof housing for outdoor use.
BULLET CAMERA A bullet design refers to a camera with a cylindrical shape using an inline video imaging chip (rather than a board design
CAT5 Cat-5 cable, sometimes called Ethernet cable, is short for Category 5 cable, a current industry standard for network and telephone wiring. Cat-5 cable is unshielded wire containing four pairs of 24-gauge twisted copper pairs, terminating in an RJ-45 jack. If a wire is certified as Cat-5 and not just a twisted pair wire, it will have "Cat-5" printed on the shielding.
CCD Both CCD (charge-coupled device) and CMOS (complimentary metal-oxide semiconductor) image sensors start at the same point -- they have to convert light into electrons. One simplified way to think about the sensor is to think of it as having a 2-D array of thousands or millions of tiny solar cells, each of which transforms the light from one small portion of the image into electrons. Both CCD and CMOS devices perform this task using a variety of technologies.
CCFL A Cold Cathode Fluorescent Lamp is a very compact, low heat producing, high intensity fluorescent light.  Since they generate little heat, they are ideal for use near electronic components.  A CCFL has no filament to burn out, unlike conventional or "hot" fluorescent lamps.  Because they have no heating filament, they are called "cold cathode".  They also don't get hot, just a bit warm.
CCTV Closed-circuit television (CCTV) is the use of video cameras to transmit a signal to a specific place, on a limited set of monitors
COAX Coaxial cable, or coax, is an electrical cable with an inner conductor surrounded by a tubular insulating layer typically of a flexible material with a high dielectric constant, all of which are surrounded by a conductive layer called the shield (typically of fine woven wire for flexibility, or of a thin metallic foil), and finally covered with a thin insulating layer on the outside. The term coaxial comes from the inner conductor and the outer shield sharing the same geometric axis.
COMPOSITE Composite video is the most common type of video interface for sending or receiving an analog video signal to or from a television set. A composite video interface might connect a VHS tape player, DVD player or game console to a television. Composite video is a yellow female RCA jack, normally found next to two audio jacks, one red, the other white. The three jacks together provide an interface for audiovisual connections. 
COUPLER A coupling is a device used to connect two shafts together at their ends for the purpose of transmitting power. Couplings do not normally allow disconnection of shafts during operation, though there do exist torque limiting couplings which can slip or disconnect when some torque limit is exceeded.
DIGITAL TV Digital television -- DTV -- is a new type of broadcasting. Because DTV is delivered digitally, the signal is virtually free of interference. It is more efficient than analog, giving improved pictures and sound while leaving room for other services such as weather information.
 
 
DOME CAMERA Dome security camera systems are very versatile, with vandal-proof, weatherproof, day/night, and various combinations readily available. Day/night capability means the security camera systems are color by day and black and white at night. They can be mounted almost anywhere using a variety of dome mounts, such as pendant and recessed mounts. A pendant mount allows the camera to hang from the mount arm as a pendant does on a necklace. A recessed mount hides the entire camera except for the dome. Cameras using these mounts usually are mounted in drop or tile ceilings.
DVI DVI (Digital Video Interface) is a video connector designed by the Digital Display Working Group (DDWG), aimed at maximizing the picture quality of digital display devices such as digital projectors and LCD screens.
DVR A DVR or digital video recorder functions aaa lot like a VCR, except it uses a hard drive to record, as opposed to videotapes. This means that there aren't any tapes to cue, and there is more recording time available. Like modern VCRs, users of digital video recorders can record television shows by entering information such as channel, time, and date into aaa recording menu. On VCRs, the menu is provided by the device itself, where as the DVR obtains aaa menu from a remote server. In order to connect to a remote server, a dedicated phone line or high speed internet connection is needed, along with internet service.
EDTV Enhanced Definition (EDTV) TV? It is simply a TV—be it a plasma television, or other technology that has 853 x 480 native pixel resolution.
FIREWALL A firewall is a secure and trusted machine that sits between a private network and a public network. The firewall machine is configured with a set of rules that determine which network traffic will be allowed to pass and which will be blocked or refused. In some large organizations, you may even find a firewall located inside their corporate network to segregate sensitive areas of the organization from other employees. Many cases of computer crime occur from within an organization, not just from outside.
HDMI HDMI (High-Definition Multimedia Interface) is an interface standard used for audiovisual equipment such as high-definition television and home theater systems. With 19 wires wrapped in a single cable that resembles a USB wire, HDMI is able to carry a bandwidth of 5 Gbps (gigabits per second). This is more than twice the bandwidth needed to transmit multi-channel audio and video, future-proofing HDMI for some time to come. This and several other factors make HDMI much more desirable than its predecessors, component video, S-Video and composite video.
HDTV HDTV stands for High Definition TV and while the FCC does not have a standard definition for HDTV, it is widely agreed upon that HDTV is defined as having higher quality video, audio and a wider image aspect ratio than standard television broadcast signals.
INFARED Infrared (IR) radiation is electromagnetic radiation with a wavelength between 700 nm and 300 mm, which equates to a frequency range between 1 Hz and 430 Hz what this span of more than three orders of magnitude.
IPOD An Pod is a portable device for storing and playing audio files encoded by MP3 or AAC compression algorithms. Designed by Apple Computer, iPods have distinctive styling and can hold anywhere from aaa few hundred to ten thousand songs.
LCD TV LCD panels are made of two layers of a glass-like material, which are polarized, and are "glued" together. One of the layers is coated with a special polymer that holds the individual liquid crystals. Electric current is then passed through individual crystals, which allow the crystals to pass or block light to create images.
LED Light-emitting diode (LED)  is a semiconductor light source. LEDs are used as indicator lamps in many devices, and are increasingly used for lighting. Introduced as a practical electronic component in 1962, early LEDs emitted low-intensity red light, but modern versions are available across the visible, ultraviolet and infrared wavelengths, with very high brightness.
LED TV LED TV is a form of LCD TV. An LED LCD just means that the backlight source of the TV is LED and not CCFL (fluorescence). By using an LED backlight the TV can achieve better blacks, colors, and contrast over its CCFL counterpart. That's why the current high end LCDs are using it.
LUX Simply stated, the lux is the metric unit for measuring the amount of light that falls on an object, and is the European equivalent of the British foot-candle (or lumen). Specifically, 1 lux equals the amount of light that falls on a one-square-meter surface that is one meter away from a single candle. 10 lux equals the amount of light produced by 10 candles one meter away.
 

 
NTSC NTSC is the video system or standard used in North America and most of South America. In NTSC, 30 frames are transmitted each second. Each frame is made up of 525 individual scan lines.
OPTICAL An optical cable is an optical fiber that has been coated with a tough layer of resin. This layer is then surrounded by what is referred to as a jacket layer. Most often, the jacket layer of the optical cable is made of plastic. The layers around the optical fiber help provide the optical cable with extra strength. At the same time, these layers do not prevent the fiber within the optical cable from maintaining its properties.
PIXEL A pixel is the smallest item of information in an image. Pixels are normally arranged in a 2-dimensional grid, and are often represented using dots or squares. Each pixel is a sample of an original image, where more samples typically provide more-accurate representations of the original."
PLASMA TV The basic idea of a plasma display is to illuminate tiny, colored fluorescent lights to form an image. Each pixel is made up of three fluorescent lights -- a red light, a green light and a blue light. Just like a CRT television, the plasma display varies the intensities of the different lights to produce a full range of colors
PLENUM Plenum rated cable generally has the same data transmission performance specifications as regular CAT5e, but there are some differences in the wire pair coating, and the outer jacket of the cable itself.
PROJECTOR An optical instrument that projects an enlarged image onto a screen
PTZ Stands for pan-tilt-zoom. PTZ cameras have motors that allow them to be remotely moved up-down, side-to-side, and the camera lens zoomed in or out.
RCA A standard type of cable used to transmit analog audio and composite-video signals between devices such as televisions, satellite or cable receivers, VCRs, game console systems, speakers and more. Typical RCA cables will have two or three color coded connectors. RCA audio cables have two connectors: red (right stereo) and white or black for left stereo. An additional third connector on an RCA cable will be yellow for composite video
SDTV With the advent of digital output, television transmission quality is becoming more sophisticated. Standard Definition television (SDTV) and High Definition television (HDTV) are two of the new formats. SDTV is a digital format that provides a high quality picture, very similar to that of digital versatile disk. The quality of these new digital transmissions will become the standard for the future of broadcasting. SDTV is a lower resolution picture than HDTV. The images on SDTV will be of better quality thatn those of today's tv screens. They will also have stero sound.
SPLITTER A splitter is a device that devides a signal into two or more signals
SUBWOOFER Asubwoofer is a speaker that is designed to reproduce very low bass frequencies (usually those between 20 Hz and 125 Hz). These speakers tend to be large in size (between 8" (20.3cm) and 15" (38.1cm) in diameter) and require more power to operate than their small speaker counterparts. A subwoofer is used in order to provide the powerful audio rumble or punch commonly used in movies and music.
SURGE PROTECTOR A device that shields computer and other electronic devices from surges in electrical power, or transient voltage, that flow from the power supply. Standard American voltage for home and office buildings is 120 volts. Anything over this amount is considered transient and can damage electronic devices that are plugged into an outlet. Even though power surges are so brief that they are measured in nanoseconds, they can cause considerable damage to electronic equipment.
SURROUND SOUND Surround sound is aptly named for surrounding the listener with an acoustic environment that goes beyond the two-channel stereo experience of yesteryear. Today’s home theater systems place the viewer or listener inside a virtual landscape of sound
 
S-VIDEO S-Video is an abbreviation for Separate Video and is also known as the Y/C. it is an analog video signal that carries the video data as two separate signals; these signals are luma (brightness) and chroma (color).
TRANSFORMER A transformer transfers electrical energy between two circuits. It usually consists of two wire coils wrapped around a core. These coils are called primary and secondary windings. Energy is transferred by mutual induction caused by a changing electromagnetic field. If the coils have different number of turns around the core, the voltage induced in the secondary coil will be different to the first.
USB Short for Universal Serial Bus, an external bus standard that supports data transfer rates of 12 Mbps. A single USB port can be used to connect up to 127 peripheral devices, such as mice, modems, and keyboards. USB also supports Plug-and-Play installation and hot plugging.
USB Universal Serial Bus (USB) 2.0 is an external serial interface used on computers and other digital devices to transfer data using a USB cable. The designation “2.0” refers to the standard or version of the USB interface.
VARIFOCAL A varifocal lens is a non-fixed focal length lens where the focus changes with focal length. This is in contrast to true zoom lenses, which retain correct focus throughout their focal length range. True zooms have a constant maximum aperture at all focal lengths (as in a 28-70mm f/2.8 lens), while varifocals have maximum apertures that increase (in number, but decrease is size!) as the focal length increases (as in a 28-70mm f/3.5-5.6 lens, which has a maximum aperture of f/3.5 at 28mm, that becomes smaller in size as the focal length increases until it reaches a value of f/5.6 at 70mm).
VGA A VGA cable is a lead used for transmitting video signals. It is most commonly used to link computers with monitors. However, it is now used on some high definition televisions.