Bedienungsanleitung Axis 207 network camera 10 pack (Seite 48 von 54) (Englisch)

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AXIS 207 - Glossary of Terms

images (VOP's) in the GOV structure. See also GOV and

VOP.

GOV structure - The GOV structure describes the

composition of an MPEG-4 video stream, as regards the

type of images (I-VOP's or P-VOP's) included in the stream,

and their internal order. See also GOV and VOP.

Half-duplex - See Full-duplex.

HTML (Hypertext Markup Language) - HTML is the set of

"markup" symbols or codes inserted in a file intended for

display in web browser. The markup tells the browser how

to display the page's words and images for the user.

HTTP (Hypertext Transfer Protocol) - HTTP is the set of

rules for exchanging files (text, graphic images, sound,

video, and other multimedia files) on the web. The HTTP

protocol runs on top of the TCP/IP suite of protocols.

Hub - A (network) hub is used to connect multiple devices

to the network. The hub transmits all data to all devices

connected to it, whereas a switch will only transmit the data

to the device it is specifically intended for.

IEEE 802.11 - A family of standards for wireless LANs. The

802.11 standard supports 1 or 2 Mbit/s transmission on the

2.4 GHz band. IEEE 802.11b specifies an 11 Mbit/s data rate

on the 2.4 GHz band, while 802.11a allows up to 54 Mbit/s

on the 5 GHz band.

Image compression - Image compression minimizes the file

size (in bytes) of an image. Two of the most common

compressed image formats are JPEG and GIF.

Interlacing - Interlaced video is video captured at 50

pictures (known as fields) per second, of which every 2

consecutive fields (at half height) are then combined into 1

frame. Interlacing was developed many years ago for the

analog TV world and is still used widely today. It provides

good results when viewing motion in standard TV pictures,

although there is always some degree of distortion in the

image.

To view interlaced video on e.g. a computer monitor, the

video must first be de-interlaced, to produce progressive

video, which consists of complete images, one after the

other, at 25 frames per second. See also Progressive scan.

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.

Axis 207 network camera 10 pack Seite 48

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