AirLive POE-100CAMv2 - Manual (Page 135)

AirLive POE100CAMv2 User’s Manual
134
Ping -
Ping is a basic network program used diagnostically to check the status of a network host or device.
Ping can be used to see if a particular network address (IP address or host name) is occupied or not, or
if the host at that address is responding normally. Ping can be run from for example, the Windows
Command prompt or the command line in UNIX.
Pixel -
A pixel is one of the many tiny dots that make up a digital image. The color and intensity of each pixel
represents a tiny area of the complete image.
PoE (Power over Ethernet) -
Power over Ethernet 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) -
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.
PPTP (Point-to-Point Tunnelling Protocol) -
A protocol (set of communication rules) that allows corporations to extend their own corporate network
through private "tunnels" over the public Internet. In this way a corporation can effectively use a WAN
(Wide Area Network) as a large single LAN (Local Area Network). This kind of interconnection is known
as a virtual private network (VPN). See also VPN.
Pre/post alarm images -
The images from immediately before and after an alarm. These images are stored in a buffer for later
retrieval.
Progressive scan -
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.
Computer monitors do not need interlace to show the picture on the screen, but instead show them
progressively, on one line at a time in perfect order, i.e. 1, 2, 3, 4, 5, 6, 7 etc., so there is virtually no
"flickering" effect. In a surveillance application, this can be critical when viewing detail within a moving
image, such as a person running. A high-quality monitor is required to get the best from progressive
scan. See also Interlacing.
Protocol -
A special set of rules governing how two entities will communicate. Protocols are found at many levels of
communication, and there are hardware protocols and software protocols.