Extron electronics SMP 300 Series User Manual page 173

Gateway — A router or proxy server between networks, or a network node equipped to
interface with another network that uses different protocols (an entrance and exit into a
communications network).
Group of Pictures (GOP) — A group of successive pictures within a coded video stream.
A GOP begins with an Intraframe (I-frame) (see page 166) containing the full spatial
resolution and data of a video frame. Predictive frames (P-frames) (see page 167) follow
I‑frames and contain data that has changed from the preceding I‑frame. Bi‑predictive
frames (B-frames) (see page 162) reference frames before and after the current frame.
H.264 (MPEG-4 AVC) — H.264/MPEG‑4 Part 10. A block oriented, motion‑compression‑
based codec standard developed by the ITU‑T Video Coding Experts Group (VCEG)
together with the ISO / IEC Moving Picture Experts Group (MPEG).
HDCP — High‑bandwidth Digital Content Protection. HDCP is a digital rights management
scheme developed by Intel to prevent the copying of digital video and audio content.
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HDCP is mandatory for the HDMI interface, optional for DVI. HDCP defines three basic
system components: source, sink, and repeater.
HDMI — High‑Definition Multimedia Interface (HDMI ): an interface for the digital
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transmission of high definition video, multi‑channel audio, and control signals, over a single
cable. (NOTE: The SMP transmits 2‑channel digital audio only.)
HDTV — High definition television with a resolution of 1080p (1920x1080p),
720p (1280x720p), or 1080i (1920x1080i).
HDTV 1080p/60 — High definition television displayed at 1920x1080 resolution
(1080p; 2,073,600 pixels) with a refresh rate of 60 Hz.
Hop — In a packet‑switching network, a hop is the trip a data packet takes from one router
(or intermediate point) to another in the network.
Host name — This is a unique name by which a device is known on a network. It identifies
a particular host in electronic communication.
Hypertext Transfer Protocol (HTTP) — A network protocol based on TCP/IP that is used
to retrieve hypertext objects from remote web pages and allows servers to transfer and
display web content to users.
Hypertext Transfer Protocol over Secure Sockets Layer (HTTPS) — A networking
protocol that allows web servers to transfer and display web content to users securely.
All transferred data is encrypted so that only the recipient is able to access and read the
content. It is not a protocol itself, but rather a combination of Hypertext Transfer Protocol
(HTTP) on top of the SSL/TLS protocol, which adds the security capabilities of SSL/TLS to
standard HTTP communications.
iCalendar file — An iCalendar file is a file containing schedule, task, or meeting information
in a standard format. iCalendar files work independent of transport protocol and can be
used cross‑platform to share calendar data.
Internet Group Management Protocol (IGMP) — A TCP/IP communications protocol
used by hosts and adjacent routers on a network to establish multicast group memberships.
When the SMP 300 Series is connected to a streaming media server, the IGMP multicast
protocol is used to pull RTSP streams. The IGMP multicast protocol conserves network
bandwidth because the streaming media server only connects to the SMP 300 Series when
the connection to the streaming media server is made by the user. All network switches and
routing equipment must be properly configured to support IGMP snooping and IGMP query
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.
SMP 300 Series • Glossary 165