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60 en | Glossary of CCTV Terms AutoDome Modular Camera System
F01U064036 | 1.0 | 2007.01 VG4-200, VG4-300, VG4-500i Series User’s Manual Bosch Security Systems, Inc.
R
Region of Interest
The defining of a specific area within a field of view to be used by the motion detection
algorithm to only look for motion within this region.
Resolution
The measure of the fine detail that can be seen in an image. For analog systems this is
typically measured in Television Lines or TVL. The higher the TVL rating, the higher the
resolution.
RS232/485
A communication interface for third party control and firmware upgrades to the AutoDome
products.
Rule
AutoDome’s alarm management subsystem that uses “if this, do that” rules to perform
specific actions when an event occurs.
S
Sector Blanking
The ability to blank out video in any of the 16 pan sectors.
Sensitivity
A measure of the amount of light required to provide a standard video signal. Sensitivity
values are stated in lux or foot-candles.
SensUp
Increases camera sensitivity by increasing the integration time on the CCD. This is
accomplished by integrating the signal from a number of consecutive video frames to reduce
signal noise.
Singlemode Fiber
An optical fiber with a silica (e.g. glass) core with a diameter of less than 10 microns. Used for
high-speed transmission over long distances, it provides greater bandwidth than multimode,
but its smaller core makes it more difficult to couple the light source. Singlemode fiber optic
transmission systems use more expensive laser-based light sources.
Spot Focus
Activates Auto Focus for three seconds after camera movement.
Subnet Mask
Subnetting is a method that allows one large network to be broken down into several smaller
ones. Depending on the network class (A, B, or C), some number of IP address bits are
reserved for the network address (subnet) and some for the host address. For example, Class
A addresses use 8 bits for the subnet address and 24 bits for the host portion of the address.
Class A subnet masks are denoted 255.0.0.0. Class B addresses (16 bits for both the subnet
and host address) use a 255.255.0.0 subnet mask. Class C addresses (8 bits for the subnet
and 24 bits for the host address) use a subnet mask of 255.255.255.0.