User Guide

Others
Glossary
92
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.
AES
Abbreviation for Advanced Encryption Standard. This is
the next-generation standard of encryption, adopted by
the U.S. government.
ARP commands
The commands for checking the entry of the IP address
and MAC address in a host computer, or for updating
them.
Bandwidth control
To limit the amount of transmitted data.
Bit rate
The rate at which data bits are transmitted.
CA (Certificate Authority)
A private authority that issues and controls digital
certificates to be used for authentication regarding
network access.
Capture
To send audio and video converted to digital data from
video devices to a computer.
Codec
Software/hardware for coding/decoding video and audio
data.
Common name
A URL to be typed in the browser when you access a
website employing SSL (Secure Sockets Layer)
protocol with the security function. Access is successful
after the URL of the website is verified as matching the
server’s common name.
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.
Digital zoom
Zooming in/out function of an image without using an
optical zooming function.
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.
EAP method
Acronym for Extensible Authentication Protocol. This
is a protocol extended from PPP (Point-to-Point
Protocol) and having an authentication function.
EAP-TLS authentication
TLS is an authentication protocol of the EAP methods
using Transport Layer Security. By using digital
certificates and other methods, EAP-TLS prevents data
falsification, eavesdropping and spoofing.
Frame rate
The number of frames of a moving image that can be
transmitted per a second.
FTP client
Software to be used for accessing the FTP server.
FTP server
A server to be used to transfer files via a network.
HTTP port
A port used to communicate between the web server and
the web client, such as a web browser.