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light will contaminate the light emitted from the CRT. Well-controlled viewing conditions should yield a
practical contrast ratio of 30:1 to 50:1.
 "DVI": Digital Visual Interface. The digital video connectivity standard that was developed by DDWG (Digital
Display Work Group). This connection standard offers two different connectors: one with 24 pins that
handles digital video signals only, and one with 29 pins that handles both digital and analog video.
 "EDID": Extended Display Identification Data – EDID is a data structure used to communicate video display
information, including native resolution and vertical interval refresh rate requirements, to a source device.
The source device will then output the optimal video format for the display based on the provided EDID
data, ensuring proper video image quality. This communication takes place over the DDC – Display Data
Channel.
 "Ethernet": A Local Area Network (LAN) standard officially known as IEEE 802.3. Ethernet and other LAN
technologies are used for interconnecting computers, printers, workstations, terminals, servers, etc. within
the same building or campus. Ethernet operates over twisted pair and over coaxial cable at speeds starting
at 10Mbps. For LAN interconnectivity, Ethernet is physical link and data link protocol reflecting the two
lowest layers of the OSI Reference Model.
 "Frame": In interlaced video, a frame is one complete picture. A video frame is made up of two fields, or
two sets of interlaced lines. In a film, a frame is one still picture of a series that makes up a motion picture.
 "Gamma": The light output of a CRT is not linear with respect to the voltage input. The difference between
what you should have and what is actually output is known as gamma.
 "HDMI" - High – Definition Multimedia Interface: An interface used primarily in consumer electronics for
the transmission of uncompressed high definition video, up to 8 channels of audio, and control signals, over
a single cable. HDMI is the de facto standard for HDTV displays, Blu-ray Disc players, and other HDTV
electronics. Introduced in 2003, the HDMI specification has gone through several revisions.
 "HDSDI": The high-definition version of SDI specified in SMPTE-292M. This signal standard transmits audio
and video with 10 bit depth and 4:2:2 color quantization over a single coaxial cable with a data rate of 1.485
Gbit/second. Multiple video resolutions exists including progressive 1280x720 and interlaced 1920x1080
resolution. Up to 32 audio signals are carried in the ancillary data.
 "JPEG" (Joint photographic Expects Group): Commonly used method of lossy compression for photographic
images using a discreet cosine transfer function. The degree of compression can be adjusted, allowing a
selectable tradeoff between storage size and image quality. JPEG typically achieves 10:1 compression with
little perceptible loss in image quality. Produces blocking artifacts.
 "MPEG": Motion Picture Expect Group. A standard committee under the auspices of the International
Standards Organization working on algorithm standards that allow digital compression, storage and
transmission of moving image information such as motion video, CD-quality audio, and control data at
CD-ROM bandwidth. The MPEG algorithm provides inter-frame compression of video images and can have
an effective compression rate of 100:1 to 200:1.
 "NTSC": The color video standard used in North America and some other parts of the world created by the
National Television Standards Committee in the 1950s. A color signal must be compatible with
black-and-white TV sets. NTSC utilizes an interlaced video signals, 525 lines of resolution with a refresh rate
of 60 fields per second (60 Hz). Each frame is comprised of two fields of 262.5 lines each, running at an
effective rate of 30 frames per second.
 "Operator": Refers to the person who uses the system.
 "PAL": Phase Alternate Line. A television standard in which the phase of the color carrier is alternated from
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