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Glossary
Dual Stream: Dual stream is a technology used to record high resolution video locally while
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transmitting a lower resolution stream over the network. The two streams are generated by the
device, with the main stream having a maximum resolution of 4CIF and the sub-stream having a
maximum resolution of CIF.
HDD: Acronym for Hard Disk Drive. A storage medium which stores digitally encoded data on
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platters with magnetic surfaces.
DHCP: Dynamic Host Configuration Protocol (DHCP) is a network application protocol used by
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devices (DHCP clients) to obtain configuration information for operation in an Internet Protocol
network.
HTTP: Acronym for Hypertext Transfer Protocol. A protocol to transfer hypertext request and
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information between servers and browsers over a network
DDNS: Dynamic DNS is a method, protocol, or network service that provides the capability for a
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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.
PPPoE: Stands for "Point-to-Point Protocol over Ethernet." PPPoE is a network configuration used
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for establishing a PPP connection over an Ethernet protocol.
Hybrid device: A hybrid device is a combination of a DVR and device.
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NTP: Acronym for Network Time Protocol. A protocol designed to synchronize the clocks of
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computers over a network.
NTSC: Acronym for National Television System Committee. NTSC is an analog television standard
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used in such countries as the United States and Japan. Each frame of an NTSC signal contains 525
scan lines at 60Hz.
Device: Acronym for Network Video Recorder. A device can be a PC-based or embedded system
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used for centralized management and storage for IP cameras, IP Domes and other devices.
PAL: Acronym for Phase Alternating Line. PAL is also another video standard used in broadcast
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televisions systems in large parts of the world. PAL signal contains 625 scan lines at 50Hz.
PTZ: Acronym for Pan, Tilt, Zoom. PTZ cameras are motor driven systems that allow the camera to
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pan left and right, tilt up and down and zoom in and out.
USB: Acronym for Universal Serial Bus. USB is a plug-and-play serial bus standard to interface
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devices to a host computer.
Network Video Recorder User Manual
Chapter 21 Appendix
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