Ultra Disk DVR 7 Bedienungsanleitung PDF herunterladen (Seite 92)

ALIEN616 User’s Manual V2.0.5

14. 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 4CIF and the sub-stream having a maximum

resolution of CIF at 12 frames per second.

• DVR: Acronym for Digital Video Recorder. A DVR is a device that is able to

accept video signals from analogue 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

• 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.

• NTP: Acronym for Network Time Protocol. A protocol designed to

synchronise the clocks of computers over a network.

• NTSC: Acronym for National Television System Committee. NTSC is an

analogue 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 centralised management and storage for IP

cameras, IP Domes and other DVRs.

• 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. Used in the UK.

• 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.

• 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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Ultra Disk DVR 7 Bedienungsanleitung Seite 92