Extron electronics SMP 300 Series User Manual page 175

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, or Odd.
Predictive frame (P-frame) — In video compression schemes, predictive frames follow
I‑frames and contain data that has changed from the preceding
I-frame (see page 166).
Presenter — A person who makes recordings using the SMP, regardless of their login role
(user or administrator).
When the Record button is pressed in the AV Controls panel, the Start an Adhoc
Recording pop‑up window opens, where you can enter the name of the presenter in the
Presenter field. The name of the presenter is stored with the metadata for the recording,
and it appears in the Creator column of the Scheduled Events > Recording
Calendar > List View table. If recordings are uploaded from the SMP to an
Opencast, or Kaltura system, and if that presenter is a user of that publishing system, the
presenter or creator name is used to sort or tag that recording.
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).
Push streaming — A streaming method where the encoder sends content out to one
(unicast) or more (multicast) decoders using one of the transport protocols. Content
streaming is initiated at the encoder.
Quality of Service (QoS) — The grade of performance, such as transmission rates and
error rates, of a communications channel or system. QoS provides a level of predictability
and control beyond the best‑effort delivery that the router provides by default (best‑
effort service provides packet transmission with no assurance of reliability, delay, jitter, or
throughput).
Real-time Messaging Protocol (RTMP) — An application level protocol, owned by
Adobe, designed for transmission of audio, video, and data over TCP.
Real-time Streaming Protocol (RTSP) — A network control protocol designed for use in
audio visual and communications systems to control streaming media.
Real-time Transport Protocol (RTP) — An Internet Engineering Task Force (IETF)
standard for streaming real‑time multimedia over IP in packets.
Router — A network device that forwards packets from one network to another.
Secondary storage mode — The SMP setting in which recordings are saved to two
storage drives rather than one. This is the alternative to single storage mode (see Single
Storage Mode on page 162).
Secure File Transfer Protocol (SFTP) — Similar to FTP, this protocol adds encryption and
requires credentials for file transfers.
Secure Shell (SSH) — A network protocol that creates a secure channel used for secure
communication between two computers on a network. SSH is typically used for data
communication, remote shell (login) services, or command execution.
Secure Sockets Layer (SSL) — A protocol used by web servers and web browsers that
creates a uniquely encrypted channel for private communications over the public Internet.
Session Announcement Protocol (SAP) — Used by source devices (encoders or servers)
in conjunction with SDP to publicize the availability of a stream to decoders and players.
The SAP periodically broadcasts session description information on an industry standard
multicast address and port. When received by remote clients, these announcements can be
used to facilitate the viewing of streams, eliminating the need for user configuration.
SMP 300 Series • Glossary 167