Education Sharing System User Manual
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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
Acronym for Network Time Protocol. A protocol designed to synchronize the clocks of computers
over a network.
NTSC
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.
NVR
Acronym for Network Video Recorder. An NVR can be a PC-based or embedded system used for
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