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Axis 215PTZ-E [52/56] Axis 215 ptz axis 215 ptz e glossary of terms

AXIS COMMUNICATIONS

<Product Name> Quick User’s Guide

AXIS 215 PTZ/ AXIS 215 PTZ-E - Glossary of Terms

Monitor - A monitor is very similar to a standard television set, but

lacks the electronics to pick up regular television signals.

Motion JPEG - Motion JPEG is a simple compression/decompression

technique for networked video. Latency is low and image quality is

guaranteed, regardless of movement or complexity of the image. Image

quality is controlled by adjusting the compression level, which in turn

provides control over the file size, and thereby the bit rate.

High-quality individual images from the Motion JPEG stream are easily

extracted. See also JPEG.

Megapixel - See Pixel.

MPEG (Moving Picture Experts Group) - The Moving Picture Experts

Group develops standards for digital video and audio compression. It

operates under the auspices of the International Organization for

Standardization (ISO). The MPEG standards are an evolving series, each

designed for a different purpose.

MPEG-2 - MPEG-2 is the designation for a group of audio and video

coding standards, and is typically used to encode audio and video for

broadcast signals, including digital satellite and Cable TV. MPEG-2, with

some modifications, is also the coding format used by standard

commercial DVD movies.

MPEG-4 - MPEG-4 is a group of audio and video coding standards and

related technology. The primary uses for the MPEG-4 standard are web

(streaming media) and CD distribution, conversational (videophone), and

broadcast television.

Most of the features included in MPEG-4 are left to individual

developers to decide whether to implement them or not. This means that

there are probably no complete implementations of the entire MPEG-4

set of standards. To deal with this, the standard includes the concept of

"profiles" and "levels", allowing a specific set of capabilities to be

defined in a manner appropriate for a subset of applications.

Multicast - Bandwidth-conserving technology that reduces bandwidth

usage by simultaneously delivering a single stream of information to

multiple network recipients.

Multiplexer - A multiplexer is a high-speed switch that provides

full-screen images from up to 16 analog cameras. Multiplexers can

playback everything that happened on any one camera with no

interference from the other cameras on the system.

Network connectivity - The physical (wired or wireless) and logical

(protocol) connection of a computer network or an individual device to a

network, such as the Internet or a LAN.

NTSC (National Television System Committee) - NTSC is the television

and video standard in the United States. NTSC delivers 525 lines at 60

half-frames/second.

NWay is a telecommunications protocol used to automatically negotiate

the highest available transmission speed between network devices. The

NWay protocol is also known as auto-negotiation or auto-sensing.

OEM (Original Equipment Manufacturer) - This is a designation for

companies that manufacture equipment which is then marketed and sold

to other companies under their own names.

PAL (Phase Alternating Line) - PAL is the dominant television standard

in Europe. PAL delivers 625 lines at 50 half-frames/second.

PEM (Privacy Enhanced Mail) - An early standard for securing

electronic mail. The PEM-format is often used for representing an HTTPS

certificate or certificate request.

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 e.g.

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).

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.

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