Samsung SVR-1670 manual Appendix E. Glossary

Appendix E. Glossary

Term	Definition
	A videoconferencing format that specifies data rates of 30 fps with each frame
4 CIF	containing 704 horizontal lines by 576 vertical lines.
	4CIF is 4 times the size of CIF. See CIF.
AC	Alternating Current, a form of electricity for powering an appliance. The SVR-
	1680/1660 supports either AC or DC current.
AC/DC	A power supply offering Alternating Current and Direct Current.
	An external device for which the SVR-1680/1660 can retrieve text data related to
Access Control	recorded events. Access control devices provide data related to building ingress
	and egress.
	An input signal event that triggers the opening or closing of a switch that is
Alarm	connected to a video channel on a DVR. A corresponding response varies
	depending on equipment type. Most commonly, a switcher “holds” on the camera
	corresponding to the alarm input.
	The ability of CCTV equipment to respond to an input signal, normally a simple
Alarming	switch closure. The response varies depending on equipment type, the most
	common of which is for a switcher to 'hold' on the camera corresponding to the
	alarm input.
Analog	A signal in which any level is represented by a directly proportional voltage; not
	digital.
	An ATM (Automated Teller Machine) provides data related to bank transactions. It
ATM	is an external device for which the SVR-1680/1660 can retrieve text data related
	to recorded events.
Auto Sequencing/	The act of displaying video from every camera, or a group of cameras, that is
	connected to a DVR. After a predetermined interval, the DVR displays video from
Sequencing
	the next camera in sequence. If 16 channels are connected, the DVR briefly
	displays video from cameras 1 through 16 consecutively.
Automatic	The self-acting mechanism in display devices which controls brightness of the
Brightness Control	device as a function of ambient light.
Automatic Gain	An electronic circuit that automatically adjusts the gain of a signal as a function of
	its input or other specified parameter. For the SVR-1680/1660, AGC controls the
Control (AGC)
	input range of video signals from a camera.
Auto-Terminating	Feature whereby the equipment automatically selects the correct termination
	depending on whether the video output BNC is connected.
AVI	Audio Video Interleave. A standard video file format introduced by Microsoft. AVI
	files can contain both audio and video, which can be played back synchronously.
Brightness	A function of ambient light.
CD-R	Compact-disc recordable. A CD-R disc can be written once and then read many
	times.

Term	Definition
	Common Intermediate Format. A videoconferencing format that specifies data rates
	of 30 fps with each frame containing 352 horizontal lines and 288 vertical lines.
CIF	Other related file formats include:
	· QCIF (176 x 144) QCIF stands for Quarter CIF
	· 4CIF (704 x 576) 4CIF is 4 times the size of CIF.
Continuous	The act of recording video continuously without regard to alarm events or other
	settings. When a DVR records continuously, it overwrites older video unless that
recording
	video has been marked for retention.
Contrast	The range of light and dark values in a picture or the radio between the maximum
	and the minimum brightness values.
Covert channel	A video channel that can be recorded, but whose video can be viewed only by
	users with the appropriate permissions.
	A type of video resolution.
D1/half D1	· D1 resolution is recorded at 704 x 480 horizontal and vertical lines.
	· Half D1 is recorded at 704 x 240 lines.
Data retention	The length of time that recorded video is stored on internal hard disk storage
	before it is overwritten.
DST	During Daylight Saving Time clocks are advanced by one hour, in most areas of the
	United States. Setting son the SVR-1680/1660 can adjust time to allow for DST.
DC	Direct Current. A unidirectional electric current that provides power to appliances.
	The SVR-1680/1660 supports both DC and AC power.
D-I/O	Digital Input/Output connections. Also referred to as Digital I/O.
	Refers to any of the following recording periods:
Duration	· Total length of recorded video that is stored on the hard disk;
	· Length of a specific recorded event including pre-and post-sensor recording;
	· Length of the video that should be copied to external media or storage.
DVD-R	Digital video disc-recordable. A DVD-R disc can be written once and then read
	many times.
Dwell time	A variable length of time that a channel is displayed on a monitor before another
	channel is displayed. See also Auto Sequencing.
eSATA	External serial ATA hard disk drive. Supported by the SVR-1680/1660.
	The act of recording video based on the occurrence of a sensor event or motion
Event recording	detection. When the SVR-1680/1660 is set to record video based on an event, it
	records the video along with pre- and post-sensor activity based on the configured
	settings.
Event screen	A group of cameras that are assigned to each other and are displayed
	simultaneously upon the occurrence of an alarmed event.

Digital Video Recorder 116 User Guide Digital Video Recorder 117 User Guide