Digital Video Recorder User Manual
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Each two video channels are grouped in sequence, e.g., CH01 and CH02, CH03 and
CH04..., and each two channels in the same group must be connected with the same
type of video source selected on GUI. For example, when the TVI/CVBS signal mode
is selected, then either TVI or CVBS signal input can be connected to the channels in
the same group; and when the AHD signal mode is selected, only the AHD signal
input can be connected. The above information is for reference only. Please refer to
the specific configuration of the device.
18.2 Glossary
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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.
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HDD:
Acronym for Hard Disk Drive. A storage medium which stores digitally
encoded data on platters with magnetic surfaces.
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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
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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.
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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.
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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.
