Axis M3011 Fixed Dome Network Camera User Manual download pdf (Page 41)

AXIS M3011 - Glossary of Terms

names are contained in Domain name servers.

Domain Server - Domains can also be used by organizations

who

wish to centralize the management of their (Windows)

computers. Each user within a domain has an account that

usually allows them to log in to and use any computer in the

domain, although restrictions may also apply. The domain

server is the server that authenticates the users on the network.

Ethernet - Ethernet is the most widely installed local area

netwo

rk technology. An Ethernet LAN typically uses special

grades of twisted pair wires. The most commonly installed

Ethernet systems are 10BASE-T and 100BASE-T10, which

provide transmission speeds up to 10 Mbps and 100 Mbps

respectively.

ETRAX (Ethernet Token Ring AXIS) - Axis' own

microprocesso

Factory default settings - These are the settings that

originally

applied for a device when it was first delivered from

the factory. If it should become necessary to reset a device to

its factory default settings, this will, for many devices,

completely reset any settings that were changed by the user.

Firewall - A firewall works as a barrier between networks, e.g.

bet

ween a Local Area Network and the Internet. The firewall

ensures that only authorized users are allowed to access the

one network from the other. A firewall can be software running

on a computer, or it can be a standalone hardware device.

Focal length - Measured in millimeters, the focal length of a

camera lens

determines the width of the horizontal field of

view, which in turn is measured in degrees.

FTP (File Transfer Protocol) - An application protocol that

uses the TCP

/IP protocols. It is used to exchange files between

computers/devices on networks.

Frame - A frame is a complete video image. In the 2:1

interlaced scanning

format of the RS-170 and CCIR formats, a

frame is made up of two separate fields of 262.5 or 312.5 lines

interlaced at 60 or 50 Hz to form a complete frame, which

appears at 30 or 25 Hz. In video cameras with a progressive

scan, each frame is scanned line-by-line and not interlaced;

most are also displayed at 30 and 25 Hz.

Frame rate - The frame rate used to describe the frequency at

which a

video stream is updated is measured in frames per

second (fps). A higher frame rate is advantageous when there is

movement in the video stream, as it maintains image quality

throughout.

Gain - Gain is the amplification factor an

d the extent to which

an analog amplifier boosts the strength of a signal.

Amplification factors are usually expressed in terms of power.

The decibel (dB) is the most common way of quantifying the

gain of an amplifier.

Gateway - A gateway is a point in a network that acts as an

entry p

oint to another network. In a corporate network for

example, a computer server acting as a gateway often also acts

as a proxy server and a firewall server. A gateway is often

associated with both a router, which knows where to direct a

given packet of data that arrives at the gateway, and a switch,

which furnishes the actual path in and out of the gateway for a

given packet.

GIF (Graphics Interchange Format) - GIF is one of the most

common

file formats used for images in web pages. There are

two versions of the format, 87a and 89a. Version 89a supports

animations, i.e. a short sequence of images within a single GIF

file. A GIF89a can also be specified for interlaced presentation.

GOV (Group Of VOPs) - A group of VOPs is the basic unit of

an H.264 video stream. The

GOV contains different types and

numbers of VOPs (I-VOPs, P-VOPs) as determined by the GOV

length and GOV structure. See also VOP.

GOV length - The GOV length determines the number of

imag

es (VOPs) in the GOV structure. See also GOV and VOP.

GOV structure - The GOV structure describes the composition

an H.264 video stream, as regards the type of images (I-VOPs

or P-VOPs) included in the stream, and their internal order. See

also GOV and VOP.

H.264 - Also known as MPEG-4 Part 10. This is the new

generation compres

sion standard for digital video. H.264 offers

higher video resolution than Motion JPEG or MPEG-4 at the

same bit rate and bandwidth, or the same quality video at a

lower bit rate.

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 e

xchanging 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

e 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.

Image compression - Image compression minimizes the file

siz

e (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

(know

n 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

mus

t 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

transmitt

ing 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.

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Axis M3011 Fixed Dome Network Camera User Manual Page 41

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