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Appendix A: Glossary
You may read through the below definitions for better understanding of the network
environment, and this may probably help you to deal with the network problems when
using any network devices. However, the knowledge covered in the chapter won't fail
you to setup and use the NVR.
For more information about those definitions, you may study them in relevant books
on network or network device.
ADSL
ADSL (Asymmetric Digital Subscriber Line) is a technology for transmitting digital
information at a high bandwidth on existing phone lines to homes and businesses.
Unlike regular dialup phone service, ADSL provides an "always on line" connection.
ActiveX controls
An ActiveX control is a component program object that can be re-used by many
application programs within a computer or among computers in a network. The
technology for creating ActiveX controls is part of Microsoft's overall ActiveX set of
technologies, chief of which is the Component Object Model (COM). When you use
Internet Explorer to browse website, ActiveX controls may assure the normal
displaying of images.
DHCP
DHCP (Dynamic Host Configuration Protocol) is a communications protocol that lets
network administrators manage centrally and automate the assignment of Internet
Protocol (IP) addresses in an organization's network.
DNS
DNS (Domain Name System) is a service that locates various Internet domain names
and translates them into Internet Protocol addresses. DNS service may increase the
responding speed and accuracy of a specified web site.
HTTP
HTTP (Hypertext Transfer Protocol) is a standard protocol used widely on World
Wide Web, and all files (text, graphic images, sound, video, and other multimedia
files) transferred on WWW follow this protocol. As soon as a Web user opens their
Web browser, the user is indirectly making use of HTTP.
FTP
File Transfer Protocol (FTP), a standard Internet protocol, is the simplest way to
exchange files between computers on the Internet. FTP is commonly used to
download and upload files (the formats includes: *.txt, *.exe, *.pdf, *.doc, *.mp3, *.zip,
*.rar and ect.) between two computers. When uploading or downloading, one
computer can be regarded as FTP sever, the other is client terminal.
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