Bedienungsanleitung Sony SNC-EM641 (Seite 75 von 80) (Englisch)

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Glossary

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Glossary

ActiveX control

A component program object that can be used with web

pages or other application programs. The technology for

creating ActiveX control is part of software developed

by Microsoft.

Bandwidth control

To limit the amount of transmitted data.

Bit rate

The rate at which data bits are transmitted.

Capture

To send audio and video converted to digital data from

video devices to a computer.

CBR

CBR stands for Constant Bit Rate control. When you

select this setting, bits will be consumed at a constant

rate.

Codec

Software/hardware for coding/decoding video and audio

data.

Contrast

The difference in tone between the lightest and darkest

portions of the image.

Default gateway

Device that can be used to access another network.

DHCP server

Acronym for Dynamic Host Configuration Protocol

server. The IP address of a terminal without an

individual IP address can be automatically distributed by

the Dynamic Host Configuration Protocol (DHCP). The

DHCP server assigns the IP addresses to the terminals.

Digital certificate

An electronic certificate that a CA (Certificate

Authority) attests that a public key to cancel a secret

code is issued by an authentic publisher.

DNS server

Acronym for Domain Name System server. As an IP

address required for connecting to the device on an IP

network is numerical and difficult to remember, the

Domain Name System was established. A domain name

is alphabetic and is easier to remember. When a client

computer uses a domain name to connect to another

computer, it asks a DNS server to translate the name into

the corresponding IP address. The client computer can

then obtain the IP address of the computer to be

connected.

e-Varifocal

Zooming in/out function of an image by enlarging with

a software without using an optical zooming function.

The image quality degradation is less than the Solid PTZ

because it does not use the digital zoom area.

Frame rate

The number of frames of a moving image that can be

transmitted per a second.

HTTP port

A port used to communicate between the web server and

the web client, such as a web browser.

H.264

An image compression format. The standard written by

the JVT (Joint Video Team) a joint organization for

standardization (composed of ISO and ITU-T), is

capable of transmitting video data at a higher

compression rate than that of MPEG4.

IP address

Acronym for Internet Protocol Address. An individual

IP address is basically assigned to each piece of

equipment connected to the Internet.

JPEG

Acronym for Joint Photographic Expert Group. The still

image compression technology or standards of ISO

(International Organization for Standardization) and

ITU-T. Popularly used as an image compression format

on the Internet, etc.

MAC address

A network address that uniquely identifies each LAN

card.

Multicast

The class D IP address assigned between 224.0.0.0 and

239.255.255.255. Using this IP address enables you to

transmit the same data to multiple equipment.

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