Network Video Recorder User Manual
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Chapter 10 Appendix
10.1 Glossary
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 1080P and the sub-stream 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.
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.
HTTP
Acronym for Hypertext Transfer Protocol. A protocol to transfer hypertext request and
information between servers and browsers over a network.
PPPoE
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.
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.
Hybrid DVR
A hybrid DVR is a combination of a DVR and NVR.
NTP
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