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Chapter 10 Appendix
10.1 Glossary
Dual-Stream
Dual-stream is a technology used to record high resoluon video locally while transming a
lower resoluon stream over the network. The two streams are generated by the DVR, with the
main stream having a maximum resoluon of 1080P and the sub-stream having a maximum
resoluon 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 plaers
with magnec surfaces.
DHCP
Dynamic Host Conguraon Protocol (DHCP) is a network applicaon protocol used by devices
(DHCP clients) to obtain conguraon informaon for operaon in an Internet Protocol
network.
HTTP
Acronym for Hypertext Transfer Protocol. A protocol to transfer hypertext request and
informaon between servers and browsers over a network.
PPPoE
PPPoE, Point-to-Point Protocol over Ethernet, is a network protocol for encapsulang 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
nofy a domain name server to change, in real me (ad-hoc) the acve DNS conguraon of its
congured hostnames, addresses or other informaon stored in DNS.
Hybrid DVR
A hybrid DVR is a combinaon of a DVR and NVR.
NTP
Acronym for Network Time Protocol. A protocol designed to synchronize the clocks of
computers over a network.
Network Video Recorder User Manual
81
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