Axis 212 PTZ-V User Manual page 53

intended address. As IP is a connectionless protocol, which means that
there is no established connection between the communication
end-points, packets can be sent via different routes and do not need to
arrive at the destination in the correct order.
Once the data packets have arrived at the correct destination, another
protocol - Transmission Control Protocol (TCP) - puts them in the right
order. See also TCP.
IP Address - An IP address is simply an address on an IP network used
by a computer/device connected to that network. IP addresses allow all
the connected computers/devices to find each other and to pass data
back and forth.
To avoid conflicts, each IP address on any given network must be
unique. An IP address can be assigned as fixed, so that it does not
change, or it can be assigned dynamically (and automatically) by DHCP.
An IP address consists of four groups (or quads) of decimal digits
separated by periods, for example, 130.5.5.25. Different parts of the
address represent different things. Some part will represent the network
number or address, and some other part will represent the local
machine address.
See also IP (Internet Protocol).
I-VOP - See VOP.
JPEG (Joint Photographic Experts Group) - Together with the GIF file
format, JPEG is an image file type commonly used on the web. A JPEG
image is a bitmap, and usually has the file suffix '.jpg' or ".jpeg." When
creating a JPEG image, it is possible to configure the level of
compression to use. As the lowest compression (i.e. the highest quality)
results in the largest file, there is a trade-off between image quality and
file size.
kbit/s (kilobits per second) - A measure of the bit rate, i.e. the rate at
which bits are passing a given point. See also Bit rate.
LAN (Local Area Network) - A LAN is a group of computers and
associated devices that typically share common resources within a
limited geographical area.
Linux - Linux is an open source operating system within the Unix
family. Because of its robustness and availability, Linux has won
popularity in the open source community and among commercial
application developers.
MAC address (Media Access Control address) - A MAC address is a
unique identifier associated with a piece of networking equipment, or
more specifically, its interface with the network. For example, the
network card in a computer has its own MAC address.
Manual iris - This is the opposite to an auto iris, i.e. the camera iris
must be adjusted manually to regulate the amount of light allowed to
reach the image sensor.
Mbit/s (Megabits per second) - A measure of the bit rate, i.e. the rate
at which bits are passing a given point. Commonly used to give the
"speed" of a network. A LAN might run at 10 or 100 Mbit/s. See also Bit
rate.
Monitor - A monitor is very similar to a standard television set, but
lacks the electronics to pick up regular television signals.
Motion JPEG - Motion JPEG is a simple compression/decompression
technique for networked video. Latency is low and image quality is
guaranteed, regardless of movement or complexity of the image. Image
quality is controlled by adjusting the compression level, which in turn
AXIS 212 PTZ/-V - Glossary of Terms
provides control over the file size, and thereby the bit rate.
High-quality individual images from the Motion JPEG stream are easily
extracted. See also JPEG.
Megapixel - See Pixel.
MPEG (Moving Picture Experts Group) - The Moving Picture Experts
Group develops standards for digital video and audio compression. It
operates under the auspices of the International Organization for
Standardization (ISO). The MPEG standards are an evolving series, each
designed for a different purpose.
MPEG-2 - MPEG-2 is the designation for a group of audio and video
coding standards, and is typically used to encode audio and video for
broadcast signals, including digital satellite and Cable TV. MPEG-2, with
some modifications, is also the coding format used by standard
commercial DVD movies.
MPEG-4 - MPEG-4 is a group of audio and video coding standards and
related technology. The primary uses for the MPEG-4 standard are web
(streaming media) and CD distribution, conversational (videophone), and
broadcast television.
Most of the features included in MPEG-4 are left to individual
developers to decide whether to implement them or not. This means that
there are probably no complete implementations of the entire MPEG-4
set of standards. To deal with this, the standard includes the concept of
"profiles" and "levels", allowing a specific set of capabilities to be
defined in a manner appropriate for a subset of applications.
Multicast - Bandwidth-conserving technology that reduces bandwidth
usage by simultaneously delivering a single stream of information to
multiple network recipients.
Multiplexer - A multiplexer is a high-speed switch that provides
full-screen images from up to 16 analog cameras. Multiplexers can
playback everything that happened on any one camera with no
interference from the other cameras on the system.
Network connectivity - The physical (wired or wireless) and logical
(protocol) connection of a computer network or an individual device to a
network, such as the Internet or a LAN.
NTSC (National Television System Committee) - NTSC is the
television and video standard in the United States. NTSC delivers 525
lines at 60 half-frames/second.
NWay - is a telecommunications protocol used to automatically
negotiate the highest available transmission speed between network
devices. The NWay protocol is also known as auto-negotiation or
auto-sensing.
OEM (Original Equipment Manufacturer) - This is a designation for
companies that manufacture equipment which is then marketed and
sold to other companies under their own names.
PAL (Phase Alternating Line) - PAL is the dominant television
standard in Europe. PAL delivers 625 lines at 50 half-frames/second.
PEM (Privacy Enhanced Mail) - An early standard for securing
electronic mail. The PEM-format is often used for representing an HTTPS
certificate or certificate request.
Ping - Ping is a basic network program used diagnostically to check the
status of a network host or device. Ping can be used to see if a particular
network address (IP address or host name) is occupied or not, or if the
host at that address is responding normally. Ping can be run from for