Extron electronics SMP 351 User Manual page 204

DDC — Display Data Channel (DDC) is a bi-directional communications standard
developed by VESA (Video Electronics Standards Association) that defines a universal data
transmission standard for the connectivity between display devices and computers.
Decoder — A hardware device or software program used to decompress (decode) or
change a signal from one format to another or convert a digital signal into analog.
Dynamic Host Configuration Protocol (DHCP) — A network protocol that enables
a server to automatically assign unique network addresses (IP address, subnet mask,
gateway) to a device using a defined range of numbers configured for the network.
DiffServe (Differentiated Services) — DiffServ specifies a scalable, coarse-grained
mechanism for classifying and managing network traffic and providing quality of service
(QoS).
Domain Name System (DNS) — A database system that translates domain names
(such as www.extron.com) into IP addresses.
Dynamic IP address — An IP address that is automatically assigned to a client device in
a TCP/IP network, typically by a DHCP server. Network devices that serve multiple users,
such as servers and printers, are usually assigned a static (unchanging) IP address.
Extended Display Identification Data (EDID) — A data structure used to communicate
video display information, including native resolution and vertical interval refresh rate
requirements, to a source device over the Display Device Channel (DDC). The source device
outputs the optimal video format for the display based on the provided EDID, ensuring
proper video image quality.
EDID Minder — Automatically manages EDID communication between connected
®
devices.
Elementary Stream — Raw H.264 video or raw AAC audio, not wrapped by additional
headers.
Encoder — A hardware device or software program used to compress (encode) or change
a signal from one format to another or convert an analog signal into a digital data stream.
The SMP 351 is an encoder that converts analog audio and video into digital streams.
Ethernet — A Local Area Network (LAN) standard officially known as IEEE 802.3. Ethernet
and LAN technology are used for interconnecting computers, printers, workstations,
terminals, services, and similar devices, within the same building or campus. Ethernet
operates over twisted pair and over coaxial cable at speeds starting at 10 Mbps. For LAN
interconnectivity, Ethernet is a physical link and data link protocol reflecting the two lowest
layers of the OSI Reference Model.
File Transfer Protocol (FTP) — A protocol that is used to transfer files from one host
to another host over a TCP-based network (such as the Internet). Also see Secure File
Transport Protocol (SFTP) for more information.
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 I-frame containing the full spatial resolution and data of a video
frame. Predictive frames (P-frames) follow I-frames and contain data that has changed from
the preceding I-frame. Bi-predictive frames (B-frames) 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).
SMP 351 • Reference Information 198