Axis 247S Manual de usuario descargar pdf (Pagina 41)

AXIS 247S - 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.

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 exchanging

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).

RTP- Real-Time Transfer Protocol. A transfer protocol designed for the

delivery of live content, e.g. MPEG-4.

RTSP (Real Time Streaming Protocol) - RTSP is a control protocol, and

a starting point for negotiating transports such as RTP, multicast and

Unicast, and for negotiating codecs. RTSP can be considered a “remote

control” for controlling the media stream delivered by a media server.

RTSP servers typically use RTP as the protocol for the actual transport

of audio/video data.

Simplex - In simplex operation, a network cable or communications

channel can only send information in one direction; it's a “one-way

street”.

SMTP - Simple Mail Transfer Protocol is the protocol used to send

e-mail across the Internet. SMTP authentication is a way of allowing

people outside of a domain to use an SMTP server when sending e-mail.

SNMP - Simple Network Management Protocol. An application layer

protocol that facilitates the exchange of management information

between network devices. It is part of the Transmission Control

Protocol/Internet Protocol (TCP/IP) protocol suite.

Subnet Mask - An IP address consists of two components: the network

address and the host address. “Subnetting’ enables a network

administrator to further divide the host part of the address into two or

more subnets. The subnet mask identifies the subnet to which an IP

address belongs.

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Axis 247S Manual de usuario Pagina 41

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