195 Network Video Recorder User Manual
Glossary
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.
Hard Disk Drive. A storage medium that stores digitally encoded data on platters
with magnetic surfaces.
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.
Acronym for Hypertext Transfer Protocol. A protocol to transfer hypertext request
and information between servers and browsers over a network
PPPoE, Point-to-Point Protocol over Ethernet, is a network protocol for
encapsulating Point-to-Point Protocol (PPP) frames inside Ethernet frames. It is
used mainly with ADSL services where individual users connect to the ADSL
transceiver (modem) over Ethernet and in plain Metro Ethernet networks.
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.
A hybrid DVR is a combination of a DVR and NVR.
Acronym for Network Time Protocol. A protocol designed to synchronize the
clocks of computers over a network.
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 anNTSC signal contains 525 scan lines at 60 Hz.
Acronym for Network Video Recorder. An NVR is a PC-based or embedded
system used for centralized management and storage for IP cameras, IP Domes
and other DVRs.
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 50 Hz.
Acronym for 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.
Acronym for Universal Serial Bus. USB is a plug-and-play serial bus standard to
interface devices to a host computer.
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