Axis Q7900 Rack User Manual download pdf (Page 48)

AXIS Q7406 - Glossary

Glossary

Active Speaker - a speaker with a built-in power amplifier.

ActiveX - A control (or set of rules) used by a browser. ActiveX

controls are often downloaded and installed automatically as

required.

AMC - AXIS Media Control. The control required for viewing

video images in Internet Explorer. Installs automatically on first

use.

API - Application Programming Interface. The Axis API can be

used for integrating Axis products into other applications.

ARP - Address Resolution Protocol. Used to associate an IP

address to a hardware MAC address. A request is broadcast on

the local network to find out what the MAC address is for the

IP address.

ARTPEC - Axis Real Time Picture Encoder - used for image

compression.

Aspect ratio - A ratio of width to height in images. A common

aspect ratio used for television screens and computer monitors

is 4:3. High-definition television (HDTV) uses an aspect ratio of

9:16.

BOOTP - A protocol that can automatically configure a network

device (give it an IP address).

Bonjour - Also known as zero-configuration networking,

Bonjour enables automatic discovery of computers, devices, and

services on IP networks. Bonjour allows devices to

automatically discover each other without the need to enter IP

addresses or configure DNS servers. Bonjour is developed by

Apple Computer Inc.

CGI - Common Gateway Interface. A set of rules (or a program)

that allows a Web Server to communicate with other programs.

Client/Server - Describes the network relationship between two

computer programs, in which one, the client, makes a service

request from another - the server.

DC-Iris - This special type of iris is electrically controlled by the

Axis camera, to automatically regulate the amount of light

allowed to enter.

dB (Decibels) - A unit to measure sound level changes. A 3dB

change is the smallest level change we can hear. A 3dB change

is actually twice or half the audio power level. A gain of 0dB

will leave the signal level unchanged.

De-interlacing - De-interlacing is the process taking a stream

of interlaced frames and converting it to a stream of

progressive frames.

DSL - Digital Subscriber Line. A means of transferring data via

standard phone lines.

Ethernet - A widely used networking standard.

ETRAX - Axis' own microprocessor.

Firewall - A virtual barrier between a LAN (Local Area Network)

and other networks, e.g. the Internet.

FTP - File

Transfer Protocol. Used for the simple transfer of

files to and from an FTP-server.

Full-duplex - Transmission of

data, e.g. audio, in two

directions simultaneously.

G.711 - G.711 is

the international standard for encoding

telephone audio on 64 kbps channel. It is a pulse code

modulation (PCM) scheme operating at 8 kHz sample rate.

G.726 -

Frequently used speech-compression algorithm in

telecommunications due to its high perceived speech quality

and low resource requirements.

H.264 - Also known as

MPEG-4 Part 10. This is the new

generation compression 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-

A half-duplex link communicates in one

direction at a time only, much like a walkie-talkie. Two way

communication is possible, but not simultaneously.

HTTP - Hypertext Transfer Protocol. The set of rules for

changing files (text, images, sound, video, and other files) on

the World Wide Web.

HTTP-S (HTTPS)- An extension to the HTTP protocol to support

sending data securely over the World Wide Web.

Intranet - A private network limited to an organization or

corporation. Usually closed to external traffic.

IP - Internet Protocol. See TCP/IP.

IP address - A unique number used by a computer on the

network to allow it to be identified and found.

ISMA - Internet Streaming Media Alliance.

JPEG - A standard image format, used widely for photographs.

Also known as JPG.

LAN - A local area network (LAN) is a group of computers and

associated devices that typically share common resources

within a limited geographical area.

Linux - A popular operating system that is “open source” and

practically free of charge.

Lux - A standard unit for light measurement.

Mbit/s - Megabits per second. A unit for measuring speeds in

networks. A LAN might run at 10 or 100 Mbit/s.

MPEG-4 - A video compression standard that makes good use

of bandwidth, and which can provide DVD-quality video

streams at less than 1 Mbit/s.

Multicast - A bandwidth-conserving technology that reduces

bandwidth usage by simultaneously delivering a single stream

of information to multiple network recipients.

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 - A small utility used for sending data packets to network

resources to check that they are working and that the network

is intact.

Pre/post alarm image - The images from immediately before

and after an alarm.

Protocol - A special set of rules governing how two entities will

communicate. Protocols are found at many levels of

communication, and there are hardware protocols and software

protocols.

(QoS) Quality of Service - QoS provides the means to guarantee

a certain level of a specified resource to selected traffic on a

network. Quality can be defined as e.g. a maintained level of

bandwidth, low latency, no packet losses, etc.

Router - A

device that determines the next network point to

which a packet should be forwarded on its way to its final

destination. A router is often included as part of a network

switch (see below).

1 2 ... 43 44 45 46 47 48 49 50 51

Comments to this Manuals

No comments

Axis Q7900 Rack User Manual Page 48

Comments to this Manuals

Related products and manuals for Video servers/encoders Axis Q7900 Rack