Beward N1250 Operatotion User Manual page 87

Network Time Protocol (NTP) is a protocol for synchronizing the clocks of computer
systems over packet-switched, variable-latency data networks. It is designed particularly to resist
the effects of variable latency by using a jitter buffer.
NTSC (National Television System Committee) is an analog color encoding system used
in television systems in Japan, the United States and other parts of the Americas. NTSC defines
the video signal using 525 TV lines per frame, at a refresh rate equal to 30 frames per second. See
also PAL.
ONVIF (Open Network Video Interface Forum) is a global and open industry forum with
the goal to facilitate the development and use of a global open standard for the interface of
physical IP-based security products. Or in other words, to create a standard for how IP products
within video surveillance and other physical security areas can communicate with each other.
PAL (Phase Alternating Line) is an analog color encoding system used in television
systems in Europe and in many other parts of the world. PAL defines the video signal using 625 TV
lines per frame, at a refresh rate equal to 25 frames per second.
Power over Ethernet or PoE provides power to a network device via the same cable as
used for the network connection. This is very useful for IP-Surveillance and remote monitoring
applications in places where it may be too impractical or expensive to power the device from a
power outlet.
PPP (Point-to-Point Protocol) is a protocol that uses a serial interface for communication
between two network devices. For example, a PC connected by a phone line to a server.
Point-to-Point Protocol over Ethernet (PPPoE) is a network protocol for encapsulating
Point-to-Point Protocol (PPP) frames inside Ethernet frames. It is used mainly with DSL services
where individual users connect to the DSL modem over Ethernet and in plain Metro Ethernet
networks.
Progressive scan, as opposed to interlaced video, scans the entire picture, line by line
every sixteenth of a second. In other words, captured images are not split into separate fields as in
interlaced scanning.
Router is a device that determines the next network point to which a packet should be
forwarded on its way to its final destination. A router creates and/or maintains a special routing
table that stores information on how best to reach certain destinations. A router is sometimes
included as part of a network switch.
RTP is an Internet protocol for the transport of real-time data, e.g. audio and video. It can
be used for media-on-demand as well as interactive services such as Internet telephony.
RTSP (Real Time Streaming Protocol) is a control protocol, and a starting point for
negotiating transports such as RTP, multicast and Unicast, and for negotiating codecs.
N1250 Operations User Manual
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