Milestone XProtect Essential 2014 - Manual (Page 177)

Milestone XProtect ® Essential 2014 Administrator's Manual
www.milestonesys.com 177 Glossary of Terms
MPEG
Compression standards and file formats for
digital video developed by the Moving Pictures
Experts Group. MPEG standards use so-called
lossy compression as they store only the
changes between frames, removing often
considerable amounts of redundant
information. Keyframes stored at specified
intervals record the entire view of the camera,
whereas the frames that follow record only
pixels that change. This helps greatly reduce
the size of MPEG files.
N
NTLM
In a Windows network, NT LAN Manager is a
network authentication protocol.
P
Panomorph
A type of lens that allows the creation and
viewing of 360-degree images.
P-frame
Predictive frame —the MPEG standard for
digital video compression uses P-frames
together with I-frames. An I-frame, also known
as a keyframe, is a single frame stored at
specified intervals. The I-frame records the
entire view of the camera, whereas the frames
that follow (the P-frames) record only the
pixels that change. This helps greatly reduce
the size of MPEG files.
PIN
Personal identification number (or personal
identity number)
—number used to identify and
authenticate users.
Ping
A computer network administration utility used
to determine whether an IP address is
available, by sending a small amount of data to
see if it responds. The word ping was chosen
because it mirrors the sound of a sonar. You
send the ping command using a Windows
command prompt.
Polling
Regularly checking the state of something, for
example, whether input has been received on
a particular input port of a device. The defined
interval between such state checks is often
called a polling frequency.
Port
Logical endpoint for data traffic. Networks use
different ports for different types of data traffic.
Therefore it is sometimes, but not always,
necessary to specify which port to use for
particular data communication. Most ports are
used automatically based on the types of data
included in the communication. On TCP/IP
networks, port numbers range from 0 to 65536,
but only ports 0 to 1024 are reserved for
particular purposes. For example, port 80 is
used for HTTP traffic, which is used when
viewing web pages.
POS
(Also PoS) Point of sale: the physical place
where a sale is made, for example, at the cash
register.
Post-recording
The ability to store recordings from periods
following motion and/or specified events.
Based on incoming video being buffered on
the XProtect Essential server in case it is going
to be needed for a motion- or event-triggered
recording. Using post-recording can be highly
advantageous: if, for example, you have
defined that video should be recorded while a
gate is open, being able to see what happens
immediately after the gate is closed may also
be important.
Pre-alarm