Extron electronics SMP 351 User Manual page 206

JavaScript — A scripting programming language adding interactive features to Web
®
pages.
LAN — Local Area Network. A computer network that connects devices in a limited area,
such as a building or campus, using network equipment that does not include leased
communications lines.
Maximum Transmission Unit (MTU) — The maximum packet size allowed in a network
data packet.
Media Access Control (MAC) — A unique hardware number given to devices that
connect to the Internet. When your computer or networking device (such as a router, hub,
or interface) is connected to the Internet, a table (see "ARP") relates the IP address of the
device to its corresponding physical (MAC) address on the LAN. This protocol allows for
several terminals or network nodes to communicate within a multi-point network, typically a
local area network (LAN).
Metadata — A metadata record consists of attributes to describe another object. The
Dublin Core Metadata Element Set contains 15 generic elements for describing resources:
Creater, Contributor, Publisher, Title, Data, Language, Format, Subject, Description,
Identifier, Relation, Source, Type, Coverage, and Rights.
MPEG-2 — The video compression algorithm used for DVD-Video, Digital Broadcast
Satellite (DBS), and Digital TV (including HDTV) delivery systems.
MPEG-4 — A patented collection of methods defining compression of audio and visual (AV)
digital data. MPEG-4 allows higher amounts of data compression and encoding efficiency
than MPEG-2. It also includes support for digital rights management and for interactive
multimedia applications.
MPEG-4 uses include compression of AV data for streaming media on the Web; CD, HD
DVD, or Blu-Ray Disc distribution; voice (telephone, videophone) distribution; and broadcast
television applications.
Multicast — A network technology for the delivery of information to a group of destinations
simultaneously. A single stream is sent from the source to a group of devices at the same
time in one transmission. Delivery is managed by network switches using the most efficient
strategy to deliver the messages over each link of the network only once, and creating
copies only when the links to the group of destinations split.
Network Address Translation (NAT) — A network protocol that allows multiple devices to
have their own, individual, private addresses, but they share one public IP address (IPv4) for
connection to the internet or other networks.
Network Time Protocol (NTP) — A protocol used for synchronizing the clocks of
computer systems over networks.
Opencast Matterhorn — Matterhorn is an open-source platform to support the
management of audio and video content in the education market. Institutions can use
Matterhorn server to produce, manage, and distribute lecture recordings.
Overscan — An applied "zoom" on SMPTE inputs (NTSC, PAL, 480p, 576p,
720p,1080i,1080p) to hide closed caption/ancillary data, edge effects, or other video
artifacts.
Parity (or Parity checking) — An error detection technique that tests the integrity of the
digital data being sent. Parity can be set to None, Even, Odd, Mark, or Space.
Predictive frame (P-frame) — In video compression schemes, predictive frames
(P-frames) follow I-frames and contain data that has changed from the preceding I-frame.
Pull streaming — Streaming method that allows users to search for content. Users specify
a content source and initiate a download or view the stream. The content streaming is
initiated by the end user (at the decoder rather than at the encoder).
SMP 351 • Reference Information 200