Additional Information ǀ
DVR (Digital Video Recorder): A system that allows the recording of video images in a digital form on one of many digital storage formats such as computer hard disc, digital VHS, DV, DAT or DVD.
Dwell Time: The length of time a switcher holds on a camera before moving on to the next in sequence.
Dynamic Range: The difference between the maximum and the minimum acceptable signal level.
E.I. (Electronic Iris): Automatically changes a CCD camera’s shutter to mimic Auto Iris control, allowing fixed or Manual Iris lenses to be used in a range of areas that used to require an Auto Iris lens.
Electronic Shuttering: Electronic shuttering is the ability of the camera to compensate for moderate light changes in indoor applications without the use of Auto Iris lenses.
Encryption: The rearrangement of the bit stream of a previously digitally encoded signal in a systematic fashion to make the information unrecognizable until restored on receipt of the necessary authorization key. This technique is used for securing information transmitted over a communication channel with the intent of excluding all other than authorized receivers from interpreting the message. Can be used for voice, video and other communications signals.
Ethernet: An IEEE standard (IEEE-802) for computer data communications. A local area network used for connecting computers, printers, workstations, terminals, etc. within the same building. Ethernet operates over twisted wire, coaxial cable, and RF at speeds up to 1000 Mbps.
Ethernet Hub: A networking device that enables attached devices to receive all the information transmitted over the network, and to share network bandwidth.
F-Stop: A term used to indicate the speed of a lens. The smaller the f-number, the greater the amount of light passing through the lens.
Field: One of the two equal but vertically separated parts into which a television frame is divided in an interlaced system of scanning. One half of a frame, consisting of either the odd or the even numbered lines, 60 fields is transmitted every second.
Field of View: The maximum angle of view that can be seen through a lens or optical instrument.
Fixed Focal Length Lens: A lens with a predetermined fixed focal length, focusing control and a choice of iris functions.
Focal Length: The distance from the center of the lens to a plane at which point a sharp image of an object viewed at an infinite distance from the camera is produced. The focal length determines the size of the image and the angle of the field of view seen by the camera through the lens. That is the distance from the center of the lens to the pickup device.
Frame: The total area, occupied by the television picture, which is scanned while the picture signal is not blanked.
FTP (File Transfer Protocol): A standard for transferring files over the internet.
GLOSSARY OF TERMS
Gain: An increase in voltage or power, usually expressed in dB.
GND (Ground): An electrical connection to the earth generally though a ground rod. Power systems grounding is that point where the neutral conductor, safety ground, and building ground are connected.
Ground Fault: An undesired path that allows current to flow in a ground conductor.
Ground Loop: A completed circuit between shielded pairs of a multiple pair created by random contact between shields. An undesirable circuit condition where interference is created by ground currents when grounds are connected at more than one point.
Ground Wire: One of the three common circuit wires. The ground provides a safety route for returning current. The ground circuit is joined with the neutral conductor at the main service panel.
GUI (Graphical User Interface): Technique used to display information on a television screen or other display device in order to make the operation of some equipment easier or provide enhanced functions.
Hub: A device on a network that connects multiple computers together to form a LAN. There are two types of hubs: standard and switching. (1) Standard hub shares bandwidth across all ports. For example, if you have an 8-port 100 Mps standard hub, then all 8 ports share the 100 Mps of bandwidth.
(2) Switching hub – each port gets a dedicated amount of bandwidth. For example, if you have an 8-port 100 Mps switching hub, then each port gets a full 100 Mps of bandwidth
Interlace: A scanning process where every other horizontal line is scanned in one field while the alternate lines are scanned in the next field to produce a complete picture frame.
Internet: A public network of computers and people sharing information. Anyone can access the internet through an Internet service provider.
Internet Protocol: The protocol used to transmit video and data from a camera to a recorder on a data network.
Intranet: A private network of computers using web-based technology within a company to share information. Typically, intranets are not accessible by the general public.
IP Address (Static and DHCP): Identifies a particular computer on a network to other computers. An IP address is similar to your home address. In a neighborhood, each house has a unique address; on a network each computer must have a unique address. There are two types of IP addresses: static and DHCP. (1) Static address is where someone physically connects to a computer and defines the IP address for that computer. A static address does not change unless someone physically changes it.
(2) DHCP (Dynamic Host Configuration Protocol) address is dynamically assigned from a server that contains a pool of addresses. The server leases the computer one of the available addresses for a specified amount of time. Once
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the specified time has expired, the computer renews the lease or requests a new IP address.
IR Light (Infrared light): Invisible to the human eye. It usually refers to wavelengths longer than 700 nm. Monochrome (B/W) cameras have extremely high sensitivity in the near infrared region (715 to 800 nm) of the light spectrum.
JPEG (Joint Photographic Experts Group): A group that has recommended a compression algorithm for still digital images that can compress with ratios of over up to 30:1 giving a file size of approximately 20 kbytes per field of video. It is also the name of the format itself. There is a variant called Motion JPEG (MJPEG).
LAN (Local Area Network): A computer network covering a small geographic area, like a home, office, or group of buildings, e.g., a school.
Latency: In networking, the amount of time it takes a packet to travel from source to destination. Together, latency and bandwidth define the speed and capacity of a network.
Lens Format: The approximate size of a lens projected image. In most cases the lens will project a image slightly greater than the designated image size to ensure the pickup device is completely covered. It is recommended that camera and lenses are the same format size. A lens a larger format size can be used on a smaller format camera; however a smaller format lens should never be used with a larger format camera.
Level Control: Main iris control used to set the auto-iris circuit to a video level desired by the user. After setup, the circuit will adjust the iris to maintain this video level in changing lighting conditions. Turning the control toward High will open the iris, toward Low will close the iris.
Looping: The method of feeding a series of high impedance circuits (such as multiple monitor/ displays in parallel) from a pulse or video source with a coax transmission line in such a manner that the line is bridged (with minimum length stubs) and that the last unit properly terminates the line in its characteristic impedance. This minimizes discontinuities or reflections on the transmission line.
Lux: A unit of measuring the intensity of light.
Manual Iris Lens: A lens with a manual adjustment to set the iris opening (F stop) in a fixed position. Generally used for fixed lighting applications.
Matrix Switcher: A switcher able to route any of its (camera) inputs to any of its (monitor) outputs, they often includes telemetry control.
Mbps (Megabits per second): A measure of amount of data that can travel per second, measured in millions of bits per second (approximate).
Modulation: The process or results of the process, whereby some characteristic of one signal is varied in accordance with another signal. The modulated signal is called the carrier. The carrier may be modulated in three fundamental ways: by varying the amplitude, called amplitude modulation; by varying the frequency, called frequency modulation; by varying the phase, called phase modulation.
For ordering information, visit
www.honeywellvideo.com or contact Inside Sales at 1-800-796-2288.
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