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Internet Group Management Protocol (IGMP) — A TCP/IP communications protocol
used by hosts and adjacent routers on a network to establish multicast group memberships.
The IGMP multicast protocol conserves network bandwidth because network equipment
can efficiently deliver streams from the SME 211 when requested by the user or decoder.
All network switches and routing equipment must be properly configured to support
IGMP snooping, IGMP queries, and multicast filtering to avoid flooding all endpoints with
unnecessary streaming traffic.
Internet Protocol (IP) — The primary protocol that establishes the Internet. It defines
addressing methods and structures for datagram encapsulation, allowing delivery of packets
from a source to a destination across an internetwork based purely on addressing.
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
on page 114) or dynamic (see
DHCP
on page 110).
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 allowable size for a network data
packet.
Media Access Control (MAC) Address — 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 109) relates the IP
address of the device to its corresponding physical address on the
LAN
on page 112. 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:
Creator, 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.
SME 211 • Reference Information
112
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