10
en | Glossary of CCTV Terms
Camera, DVR, and VIP products
AR18-08-B000 | | Version 1.0 | 2008.08
Glossary of CCTV Terms
Bosch Security Systems
Typically, a personal computer is provided with one or more serial ports and usually one
parallel port. 2) In programming, a port (noun) is a logical connection place and specifically,
using the Internet protocol TCP/IP, the way a client program specifies a particular server
program on a computer in a network. Higher-level applications that use TCP/IP, such as the
Web protocol Hypertext Transfer Protocol, have ports with preassigned numbers. These are
known as well-known ports that have been assigned by the Internet Assigned Numbers
Authority (IANA). Other application processes are given port numbers dynamically for each
connection. When a service (server program) initially is started, it is said to bind to its
designated port number. As any client program wants to use that server, it also must request
to bind to the designated port number. Port numbers are from 0 to 65535. Ports 0 to 1024 are
reserved for use by certain privileged services. For the HTTP service, port 80 is defined as a
default and it does not have to be specified in the Uniform Resource Locator (URL).
Pre-Position
A pre-selected and stored combination of pan, tilt, and zoom positions that allow a set view to
be recalled. Also known as Preset Shot.
Preset Tour
A sequence of preset shots combined to provide a pre-programmed tour of the area covered
by a programmable camera.
Pressurized Dry Nitrogen Housing
A housing for outdoor applications that protects against smog, humidity, dirt, and dust.
Privacy Masking
The ability to mask out a specific area to prevent it from being viewed.
Q
QCIF
Quarter CIF: Video format with 176 × 144/120 pixels (
see
CIF).
R
RAID
Redundant Array of Independent Disks: Used for organizing two or more hard disks as if they
were one drive. On such a drive data is shared or replicated. This is used to achieve greater
capacity, reliability, and speed.
RADIUS Server
Remote Authentication Dial-In User Service: A client/server protocol for the authentication,
authorization, and accounting of users with dial-up connections on a computer network.
RADIUS is the de-facto standard for central authentication of dial-up connections via a
Modem, an ISDN, a VPN, a Wireless LAN (
see
IEEE 802.1x), and a DSL connection.
Region of Interest
A specific area within a field of view, used by the motion detection algorithm to identify
motion.
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.
RFC 868
A Request For Comment protocol for synchronizing computer clocks over the Internet.
RS232/RS422/RS485 Recommended standards for serial data transmission. A communication interface for third
party control, firmware upgrades, and service purposes for camera and DVR products.
RTP
Realtime Transport Protocol: A transfer protocol for real-time video and audio.
Rule
An alarm management subsystem that uses rules to perform specific actions when an event
occurs.
