Bedienungsanleitung Axis P3344 (Seite 65 von 68) (Englisch)

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Glossary of Terms

IP (Internet Protocol) - The Internet Protocol is a method

transmitting data over a network. Data to be sent is divided

into individual and completely independent "packets." Each

computer (or host) on the Internet has at least one address that

uniquely identifies it from all others, and each data packet

contains both the sender's address and the receiver's address.

The Internet Protocol ensures that the data packets all arrive at

the 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, e.g. 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 autoiris, 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

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-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.

Multicast - Bandwidth-conserving technology that reduces

bandwidth usage by simultaneously delivering a single stream

of information to multiple network recipients.

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 - A network protocol that automatically negotiates the

highest possible common transmission speed between two

devices.

PAL (Phase Alternating Line) - PAL is the dominant television

standard in Europe. PAL delivers 625 lines at 50

half-frames/second.

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 e.g. the Windows Command

prompt or the command line in UNIX.

Pixel - A pixel is one of the many tiny dots that make up a

digital image. The color and intensity of each pixel represents a

tiny area of the complete image.

PoE (Power over Ethernet) - Power over Ethernet provides

power to a network device via the same cable as used for the

network connection. This is very useful for IP-Surveillance and

remote monitoring applications in places where it may be too

impractical or expensive to power the device from a power

outlet.

PPP (Point-to-Point Protocol) - A protocol that uses a serial

interface for communication between two network devices. For

example, a PC connected by a phone line to a server.

Axis P3344 Seite 65

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