Extron electronics SMP 300 Series User Manual page 174

Intraframe (I-frame) — In video compression schemes, intraframes (I‑frames) are primary
frames that contain the full spatial resolution and data of a video frame.
IP address — A numerical label using the Internet Protocol assigned to devices in a
network. The IP address for the source and destination are included in an IP datagram. A
unique, 32‑bit binary number (12‑digit dotted decimal notation — xxx.xxx.xxx.xxx) based
on version 4 of the Internet Protocol (IPv4) that identifies each sender and each receiver
of information connected to a LAN, WAN, or the Internet. IP addresses can be static (see
Static IP Address on page 168) or dynamic (see DHCP on page 164).
Java™ — A class‑based, object oriented programming language developed at Sun
Microsystems , Inc. (merged with Oracle Corporation). Programs written in Java can run
® ®
on multiple platforms.
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 on page 162) relates the IP
address of the device to its corresponding physical address on the LAN (see page 166).
This protocol allows for several terminals or network nodes to communicate within a multi‑
point network, typically a local area network.
Metadata — A metadata record consists of attributes to describe another object. The
Dublin Core Metadata Element Set contains 15 generic elements for describing resources:
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 Server — An Opencast server is an open‑source platform to support the
management of audio and video content in the education market. Institutions can use an
Opencast server to produce, manage, and distribute lecture recordings.
SMP 300 Series • Glossary 166