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Glossary

Term

Definition

Data redundancy

Writing data to two or more locations for backup and data recovery. For

example, data can be stored on two or more HDDs.

DDNS

Dynamic DNS is a method, protocol, or network service that provides

the capability for a networked device, such as a router or computer

system using the Internet Protocol Suite, to notify a domain name server

to change, in real time (ad-hoc) the active DNS configuration of its

configured hostnames, addresses or other information stored in DNS

DHCP

Dynamic Host Configuration Protocol (DHCP) is a network application

protocol used by devices (DHCP clients) to obtain configuration

information for operation in an Internet Protocol network

Dual stream

Dual stream is a technology used to record high resolution video locally

while transmitting a lower resolution stream over the network. The two

streams are generated by the NVR, with the main stream having a

maximum resolution of 4CIF and the substream having a maximum

resolution of CIF.

DVR

Acronym for Digital Video Recorder. A DVR is device that is able to

accept video signals from analog cameras, compress the signal and

store it on its hard drives

HDD

Acronym for Hard Disk Drive. A storage medium which stores digitally

encoded data on platters with magnetic surfaces

HTTP

Acronym for Hypertext Transfer Protocol. A protocol to transfer

hypertext request and information between servers and browsers over a

network

Hybrid DVR

A hybrid DVR is a combination of a DVR and NVR.

NTP

Acronym for Network Time Protocol. A protocol designed to synchronize

the clocks of computers over a network.

NTSC

Acronym for National Television System Committee. NTSC is an analog

television standard used in such countries as the United States and

Japan. Each frame of an NTSC signal contains 525 scan lines at 60Hz

NVR

Acronym for Network Video Recorder. An NVR can be a PC-based or

embedded system used for centralized management and storage for IP

cameras, IP Domes and other DVRs.

PAL

Acronym for Phase Alternating Line. PAL is also another video standard

used in broadcast televisions systems in large parts of the world. PAL

signal contains 625 scan lines at 50Hz.

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