TruVision DVR 11 and DVR 11c User Manual 147
Glossary
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
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
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 substream having a maximum
resolution of CIF.
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
Acronym for Hard Disk Drive. A storage medium which stores digitally
encoded data on platters with magnetic surfaces
Acronym for Hypertext Transfer Protocol. A protocol to transfer
hypertext request and information between servers and browsers over a
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 an NTSC signal contains 525 scan lines at 60Hz
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.
Acronym for Pan, Tilt, Zoom. PTZ dome cameras are motor driven
systems that allow the camera to pan left and right, tilt up and down and
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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