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I Series Network Video Recorder User Manual, 030117NA
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18.2
Glossary
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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 DVR, with the main stream having a
maximum resolution of 4CIF and the sub-stream having a maximum resolution of CIF.
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HDD: Hard Disk Drive. A storage medium that stores digitally encoded data on platters with magnetic surfaces.
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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.
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HTTP: Hypertext Transfer Protocol. A protocol to transfer hypertext request and information between servers
and browsers over a network
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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.
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Hybrid DVR: A hybrid DVR is a combination of a DVR and NVR.
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NTP: Network Time Protocol. A protocol designed to synchronize the clocks of computers over a network.
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NTSC: 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 60 Hz.
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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.
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PAL: Phase Alternating Line. PAL is also another video standard used in broadcast television systems in large
parts of the world. PAL signal contains 625 scan lines at 50 Hz.
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PTZ: Pan, Tilt, Zoom. PTZ cameras are motor driven systems that allow the camera to pan left and right, tilt up
and down and zoom in and out.
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USB: Universal Serial Bus. USB is a plug-and-play serial bus standard to interface devices to a host computer.