Glossary - Smartwatch H20SWDVR4R Operation Manual

SmartWatch DVR Operation Manual

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.
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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.
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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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NTP: Acronym for Network Time Protocol. A protocol designed to synchronize the clocks of
computers over a network.
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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.
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PAL: 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.
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PTZ: Acronym for Pan, Tilt, Zoom. PTZ cameras are motor driven systems that allow the camera to
pan left and right, tilt up and down and zoom in and out.
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USB: 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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